WO2024251015A1 - 信息发送方法、接收方法、装置、设备及可读存储介质 - Google Patents
信息发送方法、接收方法、装置、设备及可读存储介质 Download PDFInfo
- Publication number
- WO2024251015A1 WO2024251015A1 PCT/CN2024/096208 CN2024096208W WO2024251015A1 WO 2024251015 A1 WO2024251015 A1 WO 2024251015A1 CN 2024096208 W CN2024096208 W CN 2024096208W WO 2024251015 A1 WO2024251015 A1 WO 2024251015A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- difference
- time unit
- signal
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Definitions
- the present application belongs to the field of communication technology, and specifically relates to an information sending method, receiving method, device, equipment and readable storage medium.
- a multi-base communication architecture which uses multiple excitation sources or readers to simultaneously provide radio frequency carrier signals to backscatter communication devices or extremely low power communication devices, thereby improving the forward coverage of the backscatter communication system or the extremely low power communication system.
- the target reader will be interfered by the same-frequency direct link of other readers, and the signal strength will be much greater than the backscatter signal or the target transmission signal, so it is very difficult to recover the useful backscatter modulation signal or the target transmission signal. Therefore, how to efficiently eliminate the multi-direct link interference under the multi-base backscatter communication architecture is an urgent problem to be solved.
- the embodiments of the present application provide an information sending method, a receiving method, an apparatus, a device and a readable storage medium, which can solve the problem of how to efficiently eliminate multi-direct link interference under a multi-base backscatter communication architecture.
- a method for sending information comprising:
- the first device receives the first signal
- the first device performs backscatter modulation on the first signal using a second signal to generate a third signal; wherein the second signal is constructed according to the number of second devices and a base signal, and the number of second devices is greater than 2; the second device is a device that provides the first signal, and the base signal is a signal that carries bit information through a polarity change between data in adjacent time units, or the base signal is a signal that carries bit information through a correlation value of a difference between data in adjacent time units;
- the first device sends the third signal.
- a method for receiving information comprising:
- the third device receives a third signal sent by the first device; wherein the third signal is obtained by backscattering the first signal using the second signal, the second signal is constructed according to the number of second devices and the base signal, and the number of the second devices is greater than 2; the second device is a device that provides the first signal, and the base signal is obtained by adjacent A signal in which the polarity change between data in a time unit carries bit information, or the base signal is a signal in which the bit information is carried by a correlation value of a difference between data in adjacent time units;
- the third device constructs a fourth signal according to the number of the second devices and the third signal, wherein the fourth signal carries bit information of the base signal;
- the third device demodulates the fourth signal to obtain bit information of the base signal.
- an information sending apparatus which is applied to a first device and includes:
- a first receiving module configured to receive a first signal
- a modulation module configured to perform backscatter modulation on the first signal using a second signal to generate a third signal; wherein the second signal is constructed according to the number of second devices and a base signal, and the number of second devices is greater than 2; the second device is a device that provides the first signal, and the base signal is a signal that carries bit information through a polarity change between data in adjacent time units, or the base signal is a signal that carries bit information through a correlation value of a difference between data in adjacent time units;
- a sending module is used to send the third signal.
- an information receiving apparatus which is applied to a third device, and includes:
- a second receiving module is used to receive a third signal sent by the first device; wherein the third signal is obtained by backscattering modulation of the first signal using the second signal, the second signal is constructed according to the number of second devices and the base signal, and the number of second devices is greater than 2; the second device is a device that provides the first signal, and the base signal is a signal that carries bit information through the polarity change between data in adjacent time units, or the base signal is a signal that carries bit information through the correlation value of the difference between data in adjacent time units;
- a construction module configured to construct a fourth signal according to the number of the second devices and the third signal, wherein the fourth signal carries bit information of the base signal;
- the demodulation module is used to demodulate the fourth signal to obtain the bit information of the base signal.
- a communication device which includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect or the steps of the method described in the second aspect are implemented.
- a readable storage medium on which a program or instruction is stored.
- the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.
- a wireless communication system which includes at least two of a first device, a second device, and a third device, wherein the first device is used to implement the steps of the method described in the first aspect, and the third device is used to implement the steps of the method described in the second aspect.
- a chip comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.
- a ninth aspect provides a computer program/program product, wherein the computer program/program product is stored in a storage device.
- the program/program product is executed by at least one processor to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.
- a first signal is received, and backscatter modulation is performed on the first signal using a second signal to generate and send a third signal, wherein the second signal is constructed according to the number of second devices and a base signal, the number of the second devices is greater than 2, and the second device is a device that provides the first signal, and the base signal is a signal that carries bit information through a correlation value of a polarity change or a difference between data in adjacent time units.
- multi-layer polarity differences of the base signal can be used to efficiently eliminate multi-direct link interference, and on the other hand, the polarity change or the correlation value of the difference between data in adjacent time units in the base signal is used to carry bit information, so that the signal receiving end only needs to complete multi-direct link interference elimination and modulated signal demodulation through simple polarity judgment or correlation value comparison.
- FIG1A is a block diagram of a single-base backscatter communication system applicable to embodiments of the present application.
- FIG1B is a block diagram of a bistatic backscatter communication system applicable to embodiments of the present application.
- FIG1C is a block diagram of a multi-base backscatter communication system applicable to embodiments of the present application.
- FIG2 is a flow chart of an information sending method provided in an embodiment of the present application.
- FIG3 is a schematic diagram of a first basic unit in an embodiment of the present application.
- FIG4A is a schematic diagram of signals distributed in a centralized manner in an embodiment of the present application.
- FIG4B is a schematic diagram of signals distributed in a distributed manner in an embodiment of the present application.
- 5A to 5D are schematic diagrams of time slots in Example 1 of the present application.
- 6A to 6H are schematic diagrams of time slots in Example 2 of the present application.
- FIGS. 7A to 7D are schematic diagrams of time slots in Example 3 of the present application.
- FIG8 is a flow chart of an information receiving method provided in an embodiment of the present application.
- FIG9 is a schematic diagram of the structure of an information sending device provided in an embodiment of the present application.
- FIG10 is a schematic diagram of the structure of an information receiving device provided in an embodiment of the present application.
- FIG. 11 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
- first, second, etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first” and “second” are generally of the same type, and do not limit the number of objects.
- the first object can be one or more.
- the terms used in this application are interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first” and “second” are generally of the same type, and do not limit the number of objects.
- the first object can be one or more.
- the "or” in “” means at least one of the connected objects.
- “A or B” covers three solutions, namely, solution 1: including A but not B; solution 2: including B but not A; solution 3: including both A and B.
- the character "/" generally indicates that the objects connected before and after are in an "or" relationship.
- indication in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication).
- a direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication;
- an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.
- LTE Long Term Evolution
- LTE-A Long Term Evolution
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single-carrier Frequency Division Multiple Access
- NR New Radio
- 6G 6th Generation
- Backscatter Communication refers to the use of radio frequency signals from other devices or the environment to modulate signals to transmit information. It is a typical passive IoT device.
- the basic components and main functions of the backscatter communication transmitter include:
- -Antenna unit used to receive RF signals, control commands, and also to send modulated backscattered signals.
- This module is used for backscatter communication equipment to harvest radio frequency energy or other energy, including but not limited to solar energy, kinetic energy, mechanical energy, thermal energy, etc.
- the energy harvesting module it may also include a battery power supply module.
- the backscatter communication device is a semi-passive device. The energy harvesting module or power supply module supplies power to all other modules in the device.
- -Microcontroller including control of baseband signal processing, energy storage or data scheduling status, switch switching, system synchronization, etc.
- -Signal receiving module used to demodulate control commands or data sent by the backscatter communication receiving end or other network nodes.
- - Channel coding and modulation module performs channel coding and signal modulation under the control of the controller, and realizes modulation by selecting different load impedances under the control of the controller through a selection switch.
- -Memory or sensor module used to store device identification information, location information or sensor data, etc.
- the future backscatter communication transmitter can also integrate tunnel diode amplifier modules, low noise amplifier modules, etc. to improve the receiving sensitivity and transmission power of the transmitter.
- the basic building blocks and main functions of the backscatter communication receiving end include:
- -Antenna unit used to receive the modulated backscattered signal.
- Backscatter signal detection module used to detect the backscatter signal sent by the backscatter communication transmitter, including but not limited to amplitude shift keying (ASK) detection, phase shift keying (PSK) detection, frequency shift keying (FSK) detection or quadrature amplitude modulation (QAM) detection, etc.
- ASK amplitude shift keying
- PSK phase shift keying
- FSK frequency shift keying
- QAM quadrature amplitude modulation
- -Demodulation and decoding module demodulates and decodes the detected signal to restore the original information stream.
- FIG1A shows a schematic diagram of a monostatic backscatter communication system (MBCSs) applicable to an embodiment of the present application.
- the MBCS system includes a BSC transmitting device (such as a tag) and a reader.
- the reader includes an RF source and a BSC receiving device.
- the RF source is used to generate an RF signal to power the BSC transmitting device/Tag.
- the BSC transmitting device backscatters the modulated RF signal, and the BSC receiving device in the reader demodulates the signal after receiving the backscatter signal. Since the RF signal sent from the BSC transmitting device will undergo a double near-far effect caused by the signal attenuation of the round-trip signal, the energy attenuation of the signal is large. Therefore, the MBCS system is generally used for short-distance backscatter communication, such as traditional RFID applications.
- FIG1B shows a schematic diagram of a bistatic backscatter communication system (BBCSs) applicable to an embodiment of the present application.
- BBCSs bistatic backscatter communication system
- the RF source, BSC transmitting device and BSC receiving device in the BBCS system are separate, so the problem of large round-trip signal attenuation can be avoided.
- the performance of the BBCS communication system can be further improved by reasonably placing the RF source.
- the environmental backscatter communication system ABCSs is also a bistatic backscatter communication system, but unlike the BBCS system in which the RF source is a dedicated signal RF source, the RF source in the ABCS system can be an RF source in an available environment, such as: a TV tower, a cellular base station, a WiFi signal, a Bluetooth signal, etc.
- the forward link (or called: downlink) of the backscatter communication system has limited coverage compared to the reverse link (also called: uplink).
- a multi-base backscatter communication architecture is proposed in the related art, which uses multiple excitation sources to simultaneously provide RF carrier signals to the backscatter communication equipment, thereby improving the forward (or downlink) coverage of the backscatter communication system.
- the following describes the multi-base backscatter communication architecture and the corresponding signal model, taking the example of each reader and backscatter communication equipment being a single-base architecture.
- each reader is a single-base architecture and is equipped with 1 transmitting antenna and M (M ⁇ 1) receiving antennas.
- M M ⁇ 1 receiving antennas.
- the channel from each reader to the tag is a flat and slowly fading channel, i.e., all channel coefficients are constant within the coherence time.
- h k (t) a h,k ⁇ (t- ⁇ h,k )
- f k (t) a h,k ⁇ (t- ⁇ f,k )
- g k,i (t) a g,k,i ⁇ (t- ⁇ g,k,i )
- Ps represents the average transmission power of the signal
- fc is the carrier frequency of the RF carrier signal sent by the Reader
- ⁇ fk represents the frequency offset caused by the inaccuracy of the crystal oscillator
- ⁇ k represents the initial phase.
- the received signal at the Tag end is:
- the tag modulates the received RF carrier signal c(t) and modulates its own information x(t). Assuming ⁇ represents the reflection coefficient of the tag, the backscattered signal received by the kth reader is:
- the kth reader also receives strong direct link interference from other readers in the same frequency band, which is expressed as:
- scenarios to which embodiments of the present application are applicable include multi-base backscatter communication systems, such as the multi-base backscatter communication system based on a single-base architecture shown in FIG1C .
- FIG. 2 is a flow chart of an information sending method provided in an embodiment of the present application.
- the method is executed by a first device, which is a BSC sending device, including but not limited to a tag, a passive or semi-passive Internet of Things (IoT) device, etc.
- a first device which is a BSC sending device, including but not limited to a tag, a passive or semi-passive Internet of Things (IoT) device, etc.
- IoT Internet of Things
- Step 21 The first device receives a first signal.
- the first signal is a signal for providing a radio frequency carrier and/or radio frequency energy, and may be referred to as a carrier signal, a radio frequency signal, a radio frequency carrier signal, etc., without limitation.
- the first device may receive first signals sent by multiple second devices.
- the second device is a radio frequency source, such as a reader in a single base structure.
- Step 22 The first device performs backscatter modulation on the first signal using the second signal to generate a third signal.
- the second signal is constructed according to the number of second devices and the base signal to eliminate multi-direct link interference by using the multi-layer polarity difference of the base signal.
- the number of the second devices is greater than 2.
- the second device is a device that provides the first signal, such as a reader under a single base structure.
- the base signal is a signal that carries bit information through the polarity change between data in adjacent time units, or the base signal is a signal that carries bit information through the correlation value of the difference between data in adjacent time units.
- the first device knows the number K of the second devices, where K>2.
- the value of K may be configured or indicated by the network, or may be detected or estimated by the first device itself through a detection sequence or the like.
- the time unit may include but is not limited to any of the following: a symbol, a time slot, a subframe, a frame, etc.
- the second signal may be referred to as a baseband signal or a modulated signal x(n).
- Step 23 The first device sends a third signal.
- the signal after the modulation signal x(n) is modulated may be backscattered and transmitted with a reflection coefficient ⁇ .
- the multi-layer polarity difference of the base signal can be used to efficiently eliminate the multi-direct link interference, and on the other hand, the polarity change between the data in adjacent time units in the base signal or the correlation value of the difference can be used to carry the bit information, so that the BSC receiving end only needs to complete the multi-direct link interference elimination and modulated signal demodulation through simple polarity judgment or correlation value comparison.
- the process of constructing the second signal x(n) includes the following steps:
- a second signal x(n) with a length of L can be obtained.
- x(n) is a modulated signal constructed by the base signal b[n], which can be understood as multi-layer expansion of the base signal to efficiently eliminate multi-direct link interference by using the multi-layer polarity difference of the base signal.
- the first signal includes 2 K-2 first basic units, the length of each first basic unit is L/2 K-2 , each first basic unit includes a first part and a second part, the first part occupies M first time units, the data in the M first time units are the same, the second part occupies E second time units, the data in the E second time units are the same, the data in the first time unit is the same as or opposite to the data in the second time unit, and M and E are integers greater than or equal to 2.
- M and E are integers greater than or equal to 2.
- the polarity of the data in one time unit is negative, and the polarity of the data in the other time unit is positive; or, the polarity of the data in one time unit is positive, and the polarity of the data in the other time unit is negative.
- the first time unit and the second time unit are time units of the same type, which may include any of the following: symbol, slot, subframe, frame, etc.
- the first time unit and the second time unit are both time slots, or the first time unit and the second time unit are both frames, or the first time unit and the second time unit are both symbols.
- the first part may be a reference time slot block (Reference slots), wherein the reference time slot block includes M identical slots.
- the second part may be an information time slot block (Information slots), wherein the information time slot block includes E identical slots.
- the data length corresponding to the first time unit is N
- the data length corresponding to the second time unit is N
- N is a positive integer greater than a first threshold
- N can be random.
- the first threshold is a value related to the channel delay, at least greater than the channel delay value, and can be set based on actual needs.
- the first signal can be expressed as s(t), satisfying the following time domain structure:
- n ranges from 0 to M+E, when 0 ⁇ m ⁇ M, it represents the corresponding first time unit, and when M ⁇ m ⁇ M+E, it represents the corresponding second time unit.
- n ranges from 0 to N-1, representing the data sampling value or data symbol in the first time unit/second time unit.
- x(n) represents the nth data symbol or data sampling value in the first time unit/second time unit.
- each first basic unit in the first signal may be as shown in FIG. 3 , wherein the first part includes M slots and the second part includes E slots.
- the data in the first time unit and the second time unit may be generated by a non-random sequence or a random sequence.
- the data in the first time unit and the second time unit may be a chaotic sequence generated according to a second-order Chebyshev polynomial function.
- the value range of n is 0 to N-1, indicating the data position in the first time unit/the second time unit, and x(n) indicates the nth data symbol or data sampling value in the first time unit/the second time unit.
- each second device i.e., RF source
- each second device may send P repeated first signals when sending the first signal, each first signal being a basic signal, and the P repeated first signals are distributed in a centralized manner or a distributed manner, and P is an integer greater than or equal to 2.
- the P repeated first signals are distributed together.
- the P repeated first signals are distributed at intervals.
- P repeated first signals when P repeated first signals are distributed in a centralized manner, it may be as shown in FIG. 4A ; or, when P repeated first signals are distributed in a distributed manner, it may be as shown in FIG. 4B .
- the third signal includes 2 K-2 second basic units, the length of each second basic unit is L/2 K-2 , and each second basic unit includes a third part and a fourth part, and the third part
- the base signal comprises a first sub-signal and a second sub-signal, and when the first signal is backscattered modulated by the second signal, the first sub-signal is used to modulate the first part to obtain the corresponding third part, and the second sub-signal is used to modulate the second part to obtain the corresponding fourth part.
- Modulation feature 1 bit information is carried by the polarity change between data in adjacent time units of the base signal; that is, after modulation of the base signal, the bit information of the base signal carried in the third signal is characterized by the first change of the third part and the second change of the fourth part, the first change is different from the second change, the first change is the similarity and difference between the polarity changes of the data in every two adjacent first time units in the third part, and the second change is the similarity and difference between the polarity changes of the data in every two adjacent second time units in the fourth part; for example, the first change is that the corresponding polarity changes are the same, and the second change is that the corresponding polarity changes are opposite; or, the first change is that the corresponding polarity changes are opposite, and the second change is that the corresponding polarity changes are the same;
- Modulation feature 2 Bit information is carried by the correlation value of the difference between data in adjacent time units of the base signal; that is, after modulation of the base signal, the reference bit of the first sub-signal carried in the third signal is characterized by the first correlation value or the second correlation value, the first correlation value is the correlation value of the difference between data in adjacent first time units in the third part, and the reference bit is characterized by the correlation value of the third part alone; the second correlation value is the correlation value of the difference between data in adjacent time units in the third time unit, the third time unit includes M first time units and target second time units in the third part, the target second time unit is any second time unit in the fourth part, preferably the first second time unit, and the reference bit needs to be characterized by the fourth part; the information bit of the second sub-signal carried in the third signal is characterized by the third correlation value, and the third correlation value is the correlation value of the difference between data in adjacent second time units in the fourth part.
- This information bit can be understood as the bit information carried in the base signal, and the reference
- modulation characteristics 1 and modulation characteristics 2 are described in detail below according to different situations.
- the number M of the first time units contained in the third part can be combined, the parity of M can be considered, and the polarity change of the data in the two adjacent first time units is calculated sequentially;
- the number E of the second time units contained in the fourth part can be combined, the parity of E can be considered, and the polarity change of the data in the two adjacent second time units is calculated sequentially, as long as the polarity change pattern between adjacent time units is used to carry bit information.
- bit information of the base signal carried in the third signal is characterized by a first change in the third part and a second change in the fourth part, and M and E are equal to 4
- the bit information is a first value
- the first change is that the first polarity change is the same as the second polarity change
- the second change is that the third polarity change is opposite to the fourth polarity change
- the bit information is a second value
- the first change is the first polarity change.
- the change is opposite to the second polarity change
- the second change is that the third polarity change is the same as the fourth polarity change.
- the first polarity change is the polarity change from the data in the first first time unit to the data in the second first time unit in the third part
- the second polarity change is the polarity change from the data in the third first time unit to the data in the fourth first time unit in the third part
- the first polarity change is the polarity change from the data in the second first time unit to the data in the first first time unit in the third part
- the second polarity change is the polarity change from the data in the fourth first time unit to the data in the third part.
- the third polarity change is a polarity change from data in the first second time unit in the fourth part to data in the second second time unit
- the fourth polarity change is a polarity change from data in the third second time unit in the fourth part to data in the fourth second time unit
- the third polarity change is a polarity change from data in the second second time unit in the fourth part to data in the first second time unit
- the fourth polarity change is a polarity change from data in the fourth second time unit in the fourth part to data in the third second time unit.
- bit information of the base signal carried in the third signal is characterized by the first change situation of the third part and the second change situation of the fourth part, and M and E are equal to 3
- the bit information is the first value
- the first change situation is that the fifth polarity change is the same as the sixth polarity change
- the second change situation is that the seventh polarity change is opposite to the eighth polarity change
- the bit information is the second value
- the first change situation is that the fifth polarity change is opposite to the sixth polarity change
- the second change situation is that the seventh polarity change is the same as the eighth polarity change.
- the fifth polarity change is a polarity change from the data in the first first time unit in the third part to the data in the second first time unit
- the sixth polarity change is a polarity change from the data in the second first time unit in the third part to the data in the third first time unit
- the fifth polarity change is a polarity change from the data in the second first time unit in the third part to the data in the first first time unit
- the sixth polarity change is a polarity change from the data in the third part to the data in the second first time unit.
- the seventh polarity change is a polarity change from data in the first second time unit in the fourth part to data in the second second time unit
- the eighth polarity change is a polarity change from data in the second second time unit in the fourth part to data in the third second time unit
- the seventh polarity change is a polarity change from data in the second second time unit in the fourth part to data in the first second time unit
- the eighth polarity change is a polarity change from data in the third second time unit in the fourth part to data in the second second time unit.
- the first value is equal to 1, and the second value is equal to 0; or, the first value is equal to 0, and the second value is equal to 1.
- the demodulation process of the modulated signal can be simplified.
- M and E are equal to 3 or 4
- the embodiments of the present application are not limited to this, and the above M and E may also take other values, such as M and E are equal to 5, 6 or 8, etc.
- the first part in each first basic unit of the first signal, the first part includes 4 slots, and the second part includes 4 slots, that is, M and E are equal to 4.
- the base signal b(t) includes a first sub-signal b R (mN+n) and a second sub-signal b D (mN+b), and corresponds to the first sub-signal when 0 ⁇ m ⁇ M, and corresponds to the second sub-signal when M ⁇ m ⁇ M+E, mod represents the remainder sign
- the first sub-signal corresponds to the first part, and is used to modulate the first part to obtain the corresponding third part in the third signal
- the second sub-signal corresponds to the second part, and is used to modulate the second part to obtain the corresponding fourth part in the third signal.
- the base signal b(t) can satisfy any of the following conditions:
- slot 1 to slot 2 in the first sub-signal changes from a low level to a high level, that is, the polarity changes to be positive
- slot 3 to slot 4 changes from a low level to a high level, that is, the polarity changes to be positive.
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 3 to slot 4; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal changes from low level to high level, i.e., the polarity change is positive, and slot 3 to slot 4 changes from high level to low level, i.e., the polarity change is negative.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 3 to slot 4. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- the first sub-signal in which slot 1 changes to slot 2 is from a low level to a high level, i.e., the polarity changes to be positive
- the first sub-signal in which slot 3 changes to slot 4 is from a high level to a low level, i.e., the polarity changes to be negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 3 to slot 4
- the third part is modulated by the first sub-signal To, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change of slot 1 to slot 2 in the third part is opposite to the polarity change of slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal is a change from low level to high level, that is, the polarity change is positive
- slot 3 to slot 4 is a change from low level to high level, that is, the polarity change is positive
- the polarity change of slot 1 to slot 2 in the second sub-signal is the same as the polarity change of slot 3 to slot 4
- the polarity change of slot 1 to slot 2 in the fourth part is the same as the polarity change of slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from high level to low level, that is, the polarity changes to negative
- slot 3 to slot 4 changes from high level to low level, that is, the polarity changes to negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 3 to slot 4; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal changes from low level to high level, i.e., the polarity change is positive, and slot 3 to slot 4 changes from high level to low level, i.e., the polarity change is negative.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 3 to slot 4. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- the first sub-signal from slot 1 to slot 2 changes from a low level to a high level, i.e., the polarity changes.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 3 to slot 4. Since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal changes from high level to low level, i.e., the polarity changes to negative
- slot 3 to slot 4 changes from high level to low level, i.e., the polarity changes to negative
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 3 to slot 4
- the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal, therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from a low level to a high level, that is, the polarity changes to negative
- slot 3 to slot 4 changes from a low level to a high level, that is, the polarity changes to negative.
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 3 to slot 4; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal changes from high level to low level, i.e., the polarity changes to negative
- slot 3 to slot 4 changes from low level to high level, i.e., the polarity changes to positive.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are opposite to the polarity changes from slot 3 to slot 4. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are opposite to the polarity changes from slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from high level to low level, that is, the polarity changes to negative
- slot 3 to slot 4 changes from low level to high level, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 3 to slot 4; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal changes from a low level to a high level, i.e., the polarity changes to be positive
- slot 3 to slot 4 changes from a low level to a high level, i.e., the polarity changes to be positive
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 3 to slot 4. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 3 to slot 4. That is, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from high level to low level, that is, the polarity changes to negative
- slot 3 to slot 4 changes from high level to low level, that is, the polarity changes to negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 3 to slot 4; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 3 to slot 4.
- slot 1 to slot 2 changes from high level to low level, i.e., the polarity changes to negative
- slot 3 to slot 4 changes from low level to high level, i.e., the polarity changes to positive.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are opposite to the polarity changes from slot 3 to slot 4. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are opposite to the polarity changes from slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from high level to low level, that is, the polarity changes to negative
- slot 3 to slot 4 changes from low level to high level, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 3 to slot 4; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 3 to slot 4.
- Slot 1 to slot 2 in the second sub-signal changes from high level to low level, i.e., the polarity changes to negative
- slot 3 to slot 4 changes from high level to low level, i.e., the polarity changes to negative.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 3 to slot 4. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 3 to slot 4. That is to say, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- the bit information carried in the corresponding third signal is 1; and when the polarity changes corresponding to adjacent slots in the third part are the same, and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 0.
- the specific modulation process is similar to the above process and will not be repeated here.
- the polarity changes corresponding to adjacent slots in the third part/fourth part can be used to carry bit information, so that the modulated signal demodulation can be completed only by polarity judgment between the modulated third part and the fourth part, thereby reducing the demodulation complexity of the BSC modulated signal.
- the first part in each first basic unit of the first signal, the first part includes 3 slots and the second part includes 3 slots, that is, M and E are equal to 3.
- the base signal b(t) includes a first sub-signal b R (mN+n) and a second sub-signal b D (mN+n), which corresponds to the first sub-signal when 0 ⁇ m ⁇ M and to the second sub-signal when M ⁇ m ⁇ M+E, and mod represents the remainder sign.
- the first sub-signal corresponds to the first part and is used to modulate the first part to obtain the corresponding third part in the third signal
- the second sub-signal corresponds to the second part and is used to modulate the second part to obtain the corresponding fourth part in the third signal.
- the base signal b(t) can satisfy any of the following conditions:
- slot 1 to slot 2 in the first sub-signal changes from low level to level 0, that is, the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a low level to a high level, i.e., the polarity change is positive, and slot 2 to slot 3 changes from a high level to level 0, i.e., the polarity change is negative.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from a low level to a high level, that is, the polarity changes to positive
- slot 2 to slot 3 changes from a high level to level 0, that is, the polarity changes to negative.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from low level to level 0, i.e., the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, i.e., the polarity changes to positive.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from high level to level 0, that is, the polarity changes to negative
- slot 2 to slot 3 changes from level 0 to low level, that is, the polarity changes to negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- slot 1 to slot 2 changes from a low level to a high level, i.e., the polarity change is positive, and slot 2 to slot 3 changes from a high level to level 0, i.e., the polarity change is negative.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal, and therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from a low level to a high level, that is, the polarity changes to positive
- slot 2 to slot 3 changes from a high level to level 0, that is, the polarity changes to negative.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a high level to a level 0, i.e., the polarity changes to a negative level
- slot 2 to slot 3 changes from a level 0 to a low level, i.e., the polarity changes to a negative level.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from low level to level 0, that is, the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from level 0 to high level, i.e., the polarity change is positive, and slot 2 to slot 3 changes from high level to low level, i.e., the polarity change is negative.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from level 0 to a high level, that is, the polarity changes to positive
- slot 2 to slot 3 changes from a high level to a low level, that is, the polarity changes to negative.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from low level to level 0, i.e., the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, i.e., the polarity changes to positive.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from high level to level 0, that is, the polarity changes to negative
- slot 2 to slot 3 changes from level 0 to low level, that is, the polarity changes to negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from level 0 to high level, i.e., the polarity change is positive, and slot 2 to slot 3 changes from high level to low level, i.e., the polarity change is negative.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from level 0 to a high level, that is, the polarity changes to positive
- slot 2 to slot 3 changes from a high level to a low level, that is, the polarity changes to negative.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a high level to a level 0, i.e., the polarity changes to a negative level
- slot 2 to slot 3 changes from a level 0 to a low level, i.e., the polarity changes to a negative level.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from low level to level 0, that is, the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from level 0 to low level, i.e., the polarity changes to negative
- slot 2 to slot 3 changes from low level to high level, i.e., the polarity changes to positive.
- the polarity change from slot 1 to slot 2 in the second sub-signal is opposite to the polarity change from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity change of the fourth part is the same as the polarity change of the second sub-signal. Therefore, the polarity change from slot 1 to slot 2 in the fourth part is opposite to the polarity change from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from level 0 to a low level, that is, the polarity changes to negative
- slot 2 to slot 3 changes from a low level to a high level, that is, the polarity changes to positive.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a low level to a level 0, i.e., the polarity changes to be positive
- slot 2 to slot 3 changes from a level 0 to a high level, i.e., the polarity changes to be positive
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from high level to level 0, that is, the polarity changes to negative
- slot 2 to slot 3 changes from level 0 to low level, that is, the polarity changes to negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from level 0 to low level, i.e., the polarity changes to negative
- slot 2 to slot 3 changes from low level to high level, i.e., the polarity changes to positive.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are opposite to the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are opposite to the polarity changes from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part of the third signal are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from level 0 to a low level, that is, the polarity changes to negative
- slot 2 to slot 3 changes from a low level to a high level, that is, the polarity changes to positive.
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from high level to level 0, i.e., the polarity changes to negative
- slot 2 to slot 3 changes from level 0 to low level, i.e., the polarity changes to negative.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part of the third signal are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from low level to level 0, that is, the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a high level to a low level, i.e., the polarity changes to a negative level
- slot 2 to slot 3 changes from a low level to level 0, i.e., the polarity changes to a positive level.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are opposite to the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are opposite to the polarity changes from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from high level to low level, that is, the polarity changes to negative
- slot 2 to slot 3 changes from low level to level 0, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from low level to level 0, i.e., the polarity changes to positive
- slot 2 to slot 3 changes from level 0 to high level, i.e., the polarity changes to positive.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is to say, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- slot 1 to slot 2 in the first sub-signal changes from high level to level 0, that is, the polarity changes to negative
- slot 2 to slot 3 changes from level 0 to low level, that is, the polarity changes to negative
- the polarity change from slot 1 to slot 2 in the first sub-signal is the same as the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is the same as the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a high level to a low level, i.e., the polarity changes to a negative level
- slot 2 to slot 3 changes from a low level to level 0, i.e., the polarity changes to a positive level.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are opposite to the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are opposite to the polarity changes from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are the same and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding third signal is 1.
- slot 1 to slot 2 in the first sub-signal changes from high level to low level, that is, the polarity changes to negative
- slot 2 to slot 3 changes from low level to level 0, that is, the polarity changes to positive
- the polarity change from slot 1 to slot 2 in the first sub-signal is opposite to the polarity change from slot 2 to slot 3; since the third part is modulated by the first sub-signal, the polarity change of the third part is the same as the polarity change of the first sub-signal, therefore, the polarity change from slot 1 to slot 2 in the third part is opposite to the polarity change from slot 2 to slot 3.
- Slot 1 to slot 2 in the second sub-signal changes from a high level to a level 0, i.e., the polarity changes to a negative level
- slot 2 to slot 3 changes from a level 0 to a low level, i.e., the polarity changes to a negative level.
- the polarity changes from slot 1 to slot 2 in the second sub-signal are the same as the polarity changes from slot 2 to slot 3. Since the fourth part is modulated by the second sub-signal, the polarity changes of the fourth part are the same as the polarity changes of the second sub-signal. Therefore, the polarity changes from slot 1 to slot 2 in the fourth part are the same as the polarity changes from slot 2 to slot 3. That is, when the polarity changes corresponding to adjacent slots in the third part are opposite, and the polarity changes corresponding to adjacent slots in the fourth part are the same, the bit information carried in the corresponding third signal is 0.
- the bit information carried in the corresponding modulated signal is 1; and when the polarity changes corresponding to adjacent slots in the third part are the same, and the polarity changes corresponding to adjacent slots in the fourth part are opposite, the bit information carried in the corresponding modulated signal is 0.
- the specific modulation process is similar to the above process and will not be repeated here.
- the polarity changes corresponding to adjacent slots in the third part/fourth part can be used to carry bit information, so that the modulated signal demodulation can be completed only by polarity judgment between the modulated third part and the fourth part, thereby reducing the demodulation complexity of the BSC modulated signal.
- the bit information is carried by the correlation value of the difference between the data in adjacent time units of the base signal.
- the reference bit of the first sub-signal carried in the third signal is characterized by the second correlation value, and M is equal to 2, it is necessary to borrow and combine the target part to determine the reference bit correlation value. If the reference bit is the first value, the second correlation value is the correlation value of the first difference and the second difference; or, if the reference bit is the second value, the second correlation value is the correlation value of the third difference and the fourth difference.
- the first difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the second difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part
- the first difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the second difference is the difference obtained by subtracting the data in the second first time unit in the target second time unit from the data in the third part.
- the third difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the fourth difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part
- the third difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the fourth difference is the difference obtained by subtracting the data in the target second time unit from the data in the third part.
- the third part alone can be used to determine the reference bit correlation value. If the reference bit is the first value, the first correlation value is the correlation value of the fifth difference and the sixth difference, or, if the reference bit is the second value, the first correlation value is the correlation value of the seventh difference and the eighth difference.
- the fifth difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the sixth difference is the difference obtained by subtracting the data in the third first time unit from the data in the second first time unit in the third part
- the fifth difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the sixth difference is the difference obtained by subtracting the data in the second first time unit from the data in the third part.
- the seventh difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the eighth difference is the difference obtained by subtracting the data in the third first time unit from the data in the second first time unit in the third part
- the seventh difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the eighth difference is the difference obtained by subtracting the data in the second first time unit from the data in the third first time unit.
- the reference bit correlation value can be determined by borrowing and combining with the target part. If the reference bit is a second value, the second correlation value is a correlation value between the ninth difference value and the tenth difference value, or, if the reference bit is a second value, the second correlation value is a correlation value between the eleventh difference value and the twelfth difference value.
- the ninth difference value is a difference value obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part, and the tenth difference value is a difference value obtained by subtracting the data in the third first time unit from the data in the third part; or, the ninth difference value is a difference value obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part, and the tenth difference value is a difference value obtained by subtracting the data in the third first time unit from the data in the target second time unit.
- the eleventh difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the twelfth difference is the difference obtained by subtracting the data in the target second time unit from the data in the third first time unit in the third part
- the eleventh difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the twelfth difference is the difference obtained by subtracting the data in the target second time unit from the data in the third part.
- the third part alone can be used to determine the reference bit correlation value. If the reference bit is the first value, the first correlation value is a correlation value between the thirteenth difference and the fourteenth difference, or, if the reference bit is the second value, the first correlation value is a correlation value between the fifteenth difference and the sixteenth difference.
- the thirteenth difference is a difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the fourteenth difference is a difference obtained by subtracting the data in the fourth first time unit from the data in the third part
- the thirteenth difference is a difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the fourteenth difference is a difference obtained by subtracting the data in the third first time unit from the data in the fourth first time unit in the third part.
- the fifteenth difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the sixteenth difference is the difference obtained by subtracting the data in the fourth first time unit from the data in the third first time unit in the third part
- the fifteenth difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the sixteenth difference is the difference obtained by subtracting the data in the third first time unit from the data in the fourth first time unit in the third part.
- the first value is equal to 1, and the second value is equal to 0; or, the first value is equal to 0, and the second value is equal to 1.
- the demodulation process of the modulated signal can be simplified.
- the third correlation value is a correlation value of the seventeenth difference value and the eighteenth difference value, or, if the information bit is equal to a fourth value, the third correlation value is The correlation value of the nineteenth difference and the twentieth difference.
- the seventeenth difference is the difference obtained by subtracting the data in the third second time unit from the data in the fourth part
- the eighteenth difference is the difference obtained by subtracting the data in the first second time unit from the data in the second second time unit in the fourth part
- the seventeenth difference is the difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part
- the eighteenth difference is the difference obtained by subtracting the data in the fourth part from the data in the third second time unit in the fourth part.
- the nineteenth difference is the difference obtained by subtracting the data in the fourth part from the third second time unit in the fourth part, and the twenty-third difference is the difference obtained by subtracting the data in the first second time unit from the data in the fourth part; or the nineteenth difference is the difference obtained by subtracting the data in the third second time unit from the data in the fourth part, and the twenty-third difference is the difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part.
- the third value is equal to 1, and the fourth value is equal to 0; or, the third value is equal to 0, and the fourth value is equal to 1.
- the demodulation process of the modulated signal can be simplified.
- the correlation values of different differences can be obtained by performing correlation calculations on the different differences.
- the correlation calculations may include but are not limited to multiplication, summation, etc.
- the correlation value of the first difference and the second difference may be equal to the product of the first difference and the second difference
- the correlation value of the fifth difference and the sixth difference may be equal to the product of the fifth difference and the sixth difference
- the correlation value of the ninth difference and the tenth difference may be equal to the product of the ninth difference and the tenth difference
- the correlation values of different differences can characterize the similarity of the different differences or the similarity of polarity changes.
- the modulation process under modulation feature 2 is described below by taking the case where both the first time unit and the second time unit are time slots as an example.
- the first part includes 2 slots and the second part includes 4 slots; assuming that the base signal b(t) includes a first sub-signal bR (mN+n) and a second sub-signal bD (mN+n), when 0 ⁇ m ⁇ M, it corresponds to the first sub-signal, and when M ⁇ m ⁇ M+E, it corresponds to the second sub-signal, mod represents the remainder sign, then the first sub-signal corresponds to the first part, and is used to modulate the first part to obtain the corresponding third part in the third signal; the second sub-signal corresponds to the second part, and is used to modulate the second part to obtain the corresponding fourth part in the third signal.
- the base signal b(t) can satisfy any of the following conditions:
- the product of the difference between the data in slot 2 of the third part and the data in slot 1 i.e., the polarity change from the second slot of the third part to the first slot
- the difference between the data in slot 2 of the third part and the data in slot 1 of the fourth part i.e., the polarity change from the second slot of the third part to the first slot of the fourth part
- the product of the difference between the data in slot 2 and the data in slot 1 ie., the polarity change from the second slot to the first slot in the third part
- the base signal b(t) satisfies the following waveform property: the level of the last slot (i.e. slot 2) of the third part is opposite to the level of the first slot (i.e. slot 1) of the fourth part.
- the second sub-signal waveform corresponding to the fourth part is:
- the second sub-signal waveform corresponding to the fourth part is:
- the second sub-signal waveform corresponding to the fourth part is:
- the second sub-signal waveform corresponding to the fourth part is:
- the difference between the data in slot2 of the third part and the data in slot1 i.e., the polarity change from the second slot to the first slot of the third part
- the product of the difference between the data in slot2 of the third part and the data in slot1 of the fourth part i.e., the polarity change from the second slot of the third part to the first slot of the fourth part
- the difference between the data in slot1 of the fourth part and the data in slot2 of the third part i.e., the polarity change from the first slot of the fourth part to the second slot of the third part
- the base signal b(t) satisfies the following waveform property: the level of the last slot (i.e. slot 2) of the third part is opposite to the level of the first slot (i.e. slot 1) of the fourth part.
- the second sub-signal waveform corresponding to the fourth part is:
- the second sub-signal waveform corresponding to the fourth part is:
- the second sub-signal waveform corresponding to the fourth part is:
- the second sub-signal waveform corresponding to the fourth part is:
- FIG8 is a flow chart of an information receiving method provided in an embodiment of the present application, the method is executed by a third device, the third device is a BSC receiving device, including but not limited to a reader, etc. As shown in FIG8 , the method includes the following steps:
- Step 81 The third device receives the third signal sent by the first device.
- the third signal is obtained by backscattering modulating the first signal using the second signal, and the second signal is constructed according to the number of second devices and the base signal.
- the specific construction method can refer to the above embodiment.
- the number of the second devices is greater than 2.
- the second device is a device that provides the first signal, such as a radio frequency source such as a Reader under a single base structure.
- the base signal is a signal that carries bit information through the polarity change between data in adjacent time units, or the base signal is a signal that carries bit information through the correlation value of the difference between data in adjacent time units.
- the time unit may include but is not limited to any of the following: a symbol, a time slot, a subframe, a frame, etc.
- the second signal may be referred to as a baseband signal or a modulated signal x(n).
- Step 82 The third device constructs a fourth signal according to the number of second devices and the third signal, wherein the fourth signal carries bit information of the base signal.
- the third device can be selected as any device among multiple second devices, such as the kth Reader.
- the kth Reader knows the number K of all Readers, or the number K-1 of other Readers except itself, K>2.
- the value of K can be configured or indicated by the network, or it can be detected or estimated by the kth Reader itself through detection sequence and other methods.
- the fourth signal includes a third part and a fourth part, the third part occupies M first time units, and the fourth part occupies E second time units, and M and E are integers greater than or equal to 2.
- the data length corresponding to the first time unit is N
- the data length corresponding to the second time unit is N
- N is a positive integer greater than the first threshold, and N can be random.
- the signal sent by the BSC sending device and the signal sent by other readers can be received, which can be recorded as y k [n].
- the signal y k [n] can be synchronized, channel estimated and equalized, or resource demapping can be performed to obtain Then construct the fourth signal.
- the kth reader needs to recover the base signal b[n].
- Step 83 The third device demodulates the fourth signal to obtain bit information of the base signal.
- the multi-layer polarity difference of the base signal can be used to efficiently eliminate the multi-direct link interference, and on the other hand, the polarity change between the data in adjacent time units in the base signal or the correlation value of the difference can be used to carry the bit information, so that the BSC receiving end only needs to complete the multi-direct link interference elimination and modulated signal demodulation through simple polarity judgment or correlation value comparison.
- the process of constructing the fourth signal may include the following steps:
- the fourth signal can be demodulated according to the modulation characteristics.
- the process of demodulating the fourth signal to obtain the bit information of the base signal may include:
- the third device subtracts data in every two adjacent first time units in the third part of the fourth signal to obtain a first difference value group, and subtracts data in every two adjacent second time units in the fourth part of the fourth signal to obtain a second difference value group;
- the third device determines a fourth correlation value of the difference between data in every two adjacent first time units in the third part according to the first difference value group, and determines a fifth correlation value of the difference between data in every two adjacent second time units in the fourth part according to the second difference value group;
- the third device demodulates to obtain bit information of the base signal according to the fourth correlation value and the fifth correlation value.
- the fourth correlation value can characterize the similarity or polarity change of the difference between the data of each two adjacent first time units in the third part, and can be obtained by performing a correlation calculation on the difference between the data of each two adjacent first time units in the first difference group.
- the fifth correlation value can characterize the similarity or polarity change of the difference between the data of each two adjacent second time units in the fourth part, and can be obtained by performing a correlation calculation on the difference between the data of each two adjacent first time units in the second difference group.
- the third device can perform a correlation calculation on the difference between the data of each two adjacent first time units in the first difference group to obtain the fourth correlation value, and perform a correlation calculation on the difference between the data of each two adjacent second time units in the second difference group to obtain the fifth correlation value.
- the correlation calculation includes but is not limited to multiplication, summation, etc.
- the third device When the third device receives the third signal sent by the first device, it will also receive the first signal sent by multiple other second devices.
- the first signal is a direct link interference signal.
- the data in the adjacent time units in the first part of the first signal are exactly the same, and the data in the adjacent time units in the second part of the first signal are exactly the same.
- the signal with a repetitive structure still maintains its repetitive structure after passing through the channel. Therefore, by subtracting the data in every two adjacent first time units in the third part of the fourth signal, and subtracting the data in every two adjacent second time units in the fourth part of the fourth signal, the direct link interference signal can be eliminated.
- the modulated third signal i.e., the backscattered signal
- the bit information of the base signal carried in the fourth signal is characterized by the first change of the third part and the second change of the fourth part
- the modulation rule can be combined to perform the solution based on the determined correlation value. Therefore, there is no need to construct a specific decision threshold when demodulating, and it is not limited by the influence of channel environment such as the effective repetitive structure length and the received signal to noise ratio (SNR). Therefore, the demodulation complexity can be greatly reduced and the system performance of backscatter communication is improved.
- the first difference value group includes: the difference between the data in the second first time unit and the data in the first first time unit in the third part, and the difference between the data in the fourth first time unit and the data in the third first time unit; or, the first difference value group includes: the difference between the data in the first first time unit and the data in the second first time unit in the third part, and the difference between the data in the third first time unit and the data in the fourth first time unit in the third part.
- the second difference value group includes: the difference between the data in the second second time unit and the data in the first second time unit in the fourth part, and the difference between the data in the fourth second time unit and the data in the third second time unit in the fourth part; or, the second difference value group includes: the difference between the data in the first second time unit and the data in the second second time unit in the fourth part, and the difference between the data in the third first time unit and the data in the fourth part.
- the first difference group includes: the difference between the data in the second first time unit and the data in the first first time unit in the third part, and the difference between the data in the third first time unit and the data in the second first time unit in the third part; or, the first difference group includes: the difference between the data in the first first time unit and the data in the second first time unit in the third part, and the difference between the data in the second first time unit and the data in the third first time unit in the third part.
- the second difference group includes: the difference between the data in the second second time unit and the data in the first second time unit in the fourth part, and the difference between the data in the third second time unit and the data in the second second time unit in the fourth part, or, the second difference group includes: the difference between the data in the first second time unit and the data in the second second time unit in the fourth part, and the difference between the data in the second second time unit and the data in the third second time unit in the fourth part.
- the first device may send P third signals and construct P fourth signals accordingly, where P is an integer greater than or equal to 2.
- the differences included in the P first difference groups corresponding to the P fourth signals may be averaged (this average may be understood as averaging the corresponding differences of the P third parts) to obtain a first average difference group
- the differences included in the P second difference groups corresponding to the P fourth signals may be averaged (this average may be understood as averaging the corresponding differences of the P fourth parts) to obtain a second average difference group; then, according to the first average difference group, a fourth correlation value of the difference of the data in each two adjacent first time units in the third part is determined, and according to the second average difference group, a fifth correlation value of the difference of the data in each two adjacent second time units in the fourth part is determined.
- the third device may perform a correlation calculation on the average difference values included in the first average difference value group to obtain a fourth correlation value, and perform a correlation calculation on the average difference values included in the second average difference value group to obtain a fifth correlation value.
- the correlation calculation includes but is not limited to multiplication, Sum, etc.
- the bit information of the base signal carried in the fourth signal is characterized by the first change situation of the third part and the second change situation of the fourth part, the first change situation is different from the second change situation, the first change situation is the similarities and differences between the polarity changes of the data in every two adjacent first time units in the third part, and the second change situation is the similarities and differences between the polarity changes of the data in every two adjacent second time units in the fourth part. Therefore, the similarity of the polarity changes of the data in every two adjacent first time units in the third part is different from the similarity of the polarity changes of the data in every two adjacent second time units in the fourth part. Therefore, based on the relative size comparison of the fourth correlation value of the third part and the fifth correlation value of the fourth part, the bit information of the base signal can be demodulated.
- the above-mentioned demodulation to obtain the bit information of the base signal according to the fourth correlation value and the fifth correlation value may include: the third device determines, according to a preset modulation rule, that the bit information of the base signal is a first value when the fourth correlation value is greater than or equal to the fifth correlation value, or determines that the bit information of the base signal is a second value when the fourth correlation value is less than the fifth correlation value.
- the first value is equal to 1, and the second value is equal to 0; or, the first value is equal to 0, and the second value is equal to 1.
- the demodulation process of the modulated signal can be simplified.
- This example 1 corresponds to the example 1 in the above description of the modulation process.
- the first part includes 4 slots
- the second part includes 4 slots, that is, M and E are equal to 4, and the length of each first basic unit is 8 slots.
- the third device obtains the fourth signal y(t). Afterwards, taking every 8 slots as a basic time slot block unit, the first 4 slots are the third part modulated with the base signal, and the last 4 slots are the fourth part modulated with the base signal. The adjacent even and odd 2 slots in the third part and the fourth part are subtracted respectively to obtain the first difference group and the second difference group.
- the first difference group can be obtained by subtracting the first slot from the second slot in the third part and subtracting the third slot from the fourth slot in the third part; and the second difference group can be obtained by subtracting the first slot from the second slot in the fourth part and subtracting the third slot from the fourth slot in the fourth part.
- z(mN+n) represents the difference between the nth data symbol in the m+1th slot and the mth slot.
- the P repeated first signals may be used to perform The row noise is smoothed, that is, the differences included in the calculated first difference group are averaged to obtain a first average difference group, and the differences included in the calculated second difference group are averaged to obtain a second average difference group, as follows:
- Q is the length of a data slot in the distributed structure, and the data slot is a time slot block used for other functions of the RF source.
- the average value of the difference values obtained by two adjacent even and odd slots in the third part may be calculated:
- the correlation value CR of the fourth part is calculated, and the average value of the difference between the two adjacent even and odd slots is calculated.
- the relevant value CD is as follows:
- bit information B of the BSC baseband signal (i.e., base signal) can be demodulated according to the relative size comparison of CR and CD , for example:
- This example 2 corresponds to the example 2 in the above description of the modulation process.
- the first part includes 3 slots
- the second part includes 3 slots, that is, M and E are equal to 3, and the length of each first basic unit is 6 slots.
- the third device obtains the fourth signal y(t). Afterwards, taking every 6 slots as a basic time slot block unit, the first 3 slots are the third part modulated with the base signal, and the last 3 slots are the fourth part modulated with the base signal. The adjacent 2 slots in the third part and the fourth part are subtracted to obtain the first difference group and the second difference group.
- the first difference group can be obtained by subtracting the first slot from the second slot in the third part and the second slot from the third slot in the third part; and the first difference group can be obtained by subtracting the first slot from the second slot in the fourth part. And use the third slot in the fourth part to subtract the second slot to get the second difference group.
- the difference calculated in the fourth signal can be expressed as follows:
- ⁇ 2 ⁇ n ⁇ N+ ⁇ 1 -1, mod(m,3) odd, 0 ⁇ m ⁇ M.
- z(mN+n) represents the difference between the nth data symbol in the m+1th slot and the mth slot.
- noise smoothing is performed using the P repeated first signals, that is, the differences included in the calculated first difference group are averaged to obtain a first average difference group, and the differences included in the calculated second difference group are averaged to obtain a second average difference group, as follows:
- Q is the length of a data slot in the distributed structure, and the data slot is a time slot block used for other functions of the RF source.
- the average value of the two differences obtained from two adjacent slots in the third part may be calculated:
- the correlation value CR of the fourth part is calculated, and the average value of the difference between the two adjacent slots is calculated.
- the relevant value CD is as follows:
- ⁇ 1 and ⁇ 2 are the multipath delays of the direct link and the backscatter cascade link respectively, and ⁇ 2 > ⁇ 1 .
- bit information B of the BSC baseband signal (i.e., base signal) can be demodulated according to the relative size comparison of CR and CD , for example:
- the process of demodulating the fourth signal to obtain the bit information of the base signal may include:
- the third device constructs a sixth correlation value when the reference bit carried in the fourth signal is a first value, constructs a seventh correlation value when the reference bit carried in the fourth signal is a second value, and constructs an eighth correlation value of a difference between data in adjacent second time units in the fourth part;
- the reference bit corresponds to the first sub-signal in the base signal
- the sixth correlation value is a value related to the difference between data in adjacent first time units in the third part
- the seventh correlation value is a value related to the difference between data in adjacent first time units in the third part;
- the third device demodulates according to the sixth correlation value, the seventh correlation value and the eighth correlation value to obtain information bits of the second sub-signal in the base signal.
- the third device can construct a sixth correlation value when the reference bit is a first value, construct a seventh correlation value when the reference bit carried in the third signal is a second value, and construct an eighth correlation value of the difference between data in adjacent second time units in the fourth part according to predefined, preconfigured, etc. modulation and demodulation rules, that is, the modulation rules used when generating the third signal.
- the third device may, based on a pre-established relationship between reference bits and information bits, determine, for the fourth part, that the information bit of the corresponding second sub-signal is a third value when the product of the eighth correlation value and the sixth correlation value is greater than or equal to the product of the eighth correlation value and the seventh correlation value, or determine that the information bit of the corresponding second sub-signal is a fourth value when the product of the eighth correlation value and the sixth correlation value is less than the product of the eighth correlation value and the seventh correlation value.
- the third value is equal to 1, and the fourth value is equal to 0; or, the third value is equal to 0, and the fourth value is equal to 1.
- the demodulation process of the modulated signal can be simplified.
- the third device When the third device receives the third signal sent by the second device, it will also receive the first signal sent by other multiple second devices.
- the first signal is a direct link interference signal.
- the data in the adjacent time units in the first part of the first signal are exactly the same, and the data in the adjacent time units in the second part of the first signal are exactly the same.
- the signal with a repetitive structure still maintains its repetitive structure after passing through the channel. Therefore, by constructing the correlation value of the difference between the data in the adjacent first/second time units, the data in the adjacent first/second time units can be subtracted, thereby eliminating the direct link interference signal.
- the modulated fourth signal i.e., the backscatter signal
- the modulation rule that is, the relationship between the pre-established reference bit and the information bit
- demodulation can be performed based on the constructed correlation value. Therefore, when performing demodulation, there is no need to construct a specific decision threshold, and it is not limited by the influence of the channel environment such as the effective repetitive structure length and the receiving SNR, so the demodulation complexity can be greatly reduced, the demodulation performance is improved, and the system performance of the dual-base backscatter communication is improved.
- the reference bit correlation value needs to be determined in combination with the fourth part
- the sixth correlation value is the correlation value of the twenty-first difference and the twenty-second difference
- the seventh correlation value is the correlation value of the twenty-third difference and the twenty-fourth difference.
- the twenty-first difference is the data in the second first time unit in the third part minus
- the 22nd difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part; or, the 21st difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part, and the 22nd difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part.
- the 23rd difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the 24th difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part
- the 23rd difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the 24th difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part.
- the target second time unit is any second time unit in the fourth part, preferably the first second time unit.
- the eighth correlation value is a correlation value between the twenty-fifth difference and the twenty-sixth difference, or the eighth correlation value is a correlation value between the twenty-seventh difference and the twenty-eighth difference.
- the twenty-fifth difference is a difference obtained by subtracting the data in the third second time unit from the data in the fourth part
- the twenty-sixth difference is a difference obtained by subtracting the data in the first second time unit from the data in the second second time unit in the fourth part
- the twenty-fifth difference is a difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part
- the twenty-sixth difference is a difference obtained by subtracting the data in the fourth second time unit from the data in the third second time unit in the fourth part.
- the twenty-seventh difference is the difference obtained by subtracting the data in the fourth second time unit from the data in the third second time unit in the fourth part
- the twenty-eighth difference is the difference obtained by subtracting the data in the first second time unit from the data in the second second time unit in the fourth part
- the twenty-seventh difference is the difference obtained by subtracting the data in the third second time unit from the data in the fourth part
- the twenty-eighth difference is the difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part.
- the correlation calculations can be performed on the different difference values to obtain the correlation values.
- the second device may send Z third signals and construct Z fourth signals accordingly, where Z is an integer greater than or equal to 2.
- the sixth correlation value is a correlation value determined according to the third average difference group, and the third average difference is obtained by averaging the differences included in the third difference group in the Z fourth signals;
- the third difference group includes the twenty-ninth difference, or the third difference group includes the twenty-ninth difference and the thirtieth difference,
- the twenty-ninth difference includes the difference between the data in the adjacent first time units in the third part of the fourth signal when the reference bit is the first value, and the thirtieth difference includes the difference between the data in the Mth first time unit in the third part of the fourth signal and the data in the target second time unit, and the target second time unit is any second time unit in the fourth part of the fourth signal.
- the seventh correlation value is root According to the correlation value determined by the fourth average difference group, the fourth average difference value is obtained by averaging the differences included in the fourth difference group in the Z fourth signals; the fourth difference group includes a thirty-first difference, or the fourth difference group includes a thirty-first difference and a thirty-second difference, the thirty-first difference includes the difference between the data in the adjacent first time units in the third part of the fourth signal when the reference bit is the second value, and the thirty-second difference includes the difference between the data in the Mth first time unit in the third part of the fourth signal and the data in the target second time unit, the target second time unit is any second time unit in the fourth part of the fourth signal, preferably the first second time unit.
- the eighth correlation value is a correlation value determined according to the fifth average difference group, the fifth average difference group is obtained by averaging the differences included in the fifth difference group in the Z fourth signals, and the fifth difference group includes the difference between the data in the adjacent second time units in the fourth part of the fourth signal.
- the demodulation process in the embodiment of the present application is described below by taking the case where both the first time unit and the second time unit are time slots as an example.
- This example 3 corresponds to the example 3 in the above description of the modulation process.
- ⁇ 2 ⁇ n ⁇ N+ ⁇ 1 -1, mod(m,2) 0,0 ⁇ m ⁇ M.
- z(mN+n) represents the difference of data at position n of two corresponding slots.
- ⁇ 2 ⁇ n ⁇ N+ ⁇ 1 -1, mod(m,2) 0,0 ⁇ m ⁇ M.
- z(mN+n) represents the difference of data at position n of two corresponding slots.
- K K is a positive integer
- the K repeated basic time slot blocks can be used for noise smoothing, and the following equation can be obtained:
- L is the length of a data part (such as Data slots) in the distributed structure, and the Data slots are time slot blocks of the RF source used for other functions.
- K K is a positive integer
- the K repeated basic time slot blocks can be used for noise smoothing, and the following is obtained:
- L is the length of a Data slot in the distributed structure
- the Data slot is a time slot block of the RF source used for other functions.
- FIG. 9 is a schematic diagram of the structure of an information sending device provided in an embodiment of the present application.
- the device is applied to a first device, which is a BSC sending device, including but not limited to a tag, a passive or semi-passive IoT device, etc.
- the information sending device 90 includes:
- a first receiving module 91 configured to receive a first signal
- a modulation module 92 configured to perform backscatter modulation on the first signal using a second signal to generate a third signal; wherein the second signal is constructed according to the number of second devices and a base signal, and the number of the second devices is greater than 2;
- the second device is a device that provides the first signal, the base signal is a signal that carries bit information through polarity changes between data in adjacent time units, or the base signal is a signal that carries bit information through a correlation value of a difference between data in adjacent time units;
- the sending module 93 is configured to send the third signal.
- the second signal is constructed as follows:
- b[n] represents the base signal
- the length of the base signal is L/2 K-2 .
- the first signal includes 2 K-2 first basic units, the length of each of the first basic units is L/2 K-2 , each of the first basic units includes a first part and a second part, the first part occupies M first time units, the data in the M first time units are the same, the second part occupies E second time units, the data in the E second time units are the same, the data in the first time unit is the same as or opposite to the data in the second time unit, and M and E are integers greater than or equal to 2; the third signal includes 2 K-2 second basic units, the length of each of the second basic units is L/2 K-2 , and each of the second basic units includes a third part and a fourth part;
- the base signal includes a first sub-signal and a second sub-signal.
- the first sub-signal is used to modulate the first part to obtain a corresponding third part
- the second sub-signal is used to modulate the second part to obtain a corresponding fourth part.
- the bit information of the base signal carried in the third signal is characterized by a first change situation of the third part and a second change situation of the fourth part, the first change situation is different from the second change situation, the first change situation is the similarity and difference between the polarity changes of the data in every two adjacent first time units in the third part, and the second change situation is the similarity and difference between the polarity changes of the data in every two adjacent second time units in the fourth part;
- the reference bit of the first sub-signal carried in the third signal is represented by a first correlation value or a second correlation value, the first correlation value is a correlation value of the difference between data in adjacent first time units in the third part; the second correlation value is a correlation value of the difference between data in adjacent time units in the third time unit, the third time unit includes M first time units in the third part and a target second time unit, the target second time unit is any second time unit in the fourth part; the information bit of the second sub-signal carried in the third signal is represented by a third correlation value, the third correlation value is a correlation value of the difference between data in adjacent second time units in the fourth part.
- the first time unit and the second time unit are time units of the same type, including any one of the following: a symbol, a time slot, a subframe, and a frame.
- bit information of the base signal carried in the third signal is characterized by a first change situation of the third part and a second change situation of the fourth part, and M and E are equal to 4,
- the bit information is a first value
- the first change is that the first polarity change is the same as the second polarity change
- the second change is that the third polarity change is opposite to the fourth polarity change
- the bit information is a second value
- the first change is that the first polarity change is opposite to the second polarity change
- the second change is that the third polarity change is the same as the fourth polarity change
- the first polarity change is a polarity change from data in the first first time unit in the third part to data in the second first time unit
- the second polarity change is a polarity change from data in the third first time unit in the third part to data in the fourth first time unit
- the first polarity change is a polarity change from data in the second first time unit in the third part to data in the first first time unit
- the second polarity change is a polarity change from data in the fourth first time unit in the third part to data in the third first time unit
- the third polarity change is a polarity change from data in the first second time unit in the fourth part to data in the second second time unit
- the fourth polarity change is a polarity change from data in the third second time unit in the fourth part to data in the fourth second time unit
- the third polarity change is a polarity change from data in the second second time unit in the fourth part to data in the first second time unit
- the fourth polarity change is a polarity change from data in the fourth second time unit in the fourth part to data in the third second time unit.
- bit information of the base signal carried in the third signal is characterized by the first change situation of the third part and the second change situation of the fourth part, and M and E are equal to 3
- the bit information is a first value
- the first change situation is that the fifth polarity change is the same as the sixth polarity change
- the second change situation is that the seventh polarity change is opposite to the eighth polarity change
- the bit information is a second value
- the first change situation is that the fifth polarity change is opposite to the sixth polarity change
- the second change situation is that the seventh polarity change is the same as the eighth polarity change
- the fifth polarity change is a polarity change from data in the first first time unit in the third part to data in the second first time unit
- the sixth polarity change is a polarity change from data in the second first time unit in the third part to data in the third first time unit
- the fifth polarity change is a polarity change from data in the second first time unit in the third part to data in the first first time unit
- the sixth polarity change is a polarity change from data in the third first time unit in the third part to data in the second first time unit
- the seventh polarity change is a polarity change from data in the first second time unit in the fourth part to data in the second second time unit
- the eighth polarity change is a polarity change from data in the second second time unit in the fourth part to data in the third second time unit
- the seventh polarity change is a polarity change from data in the second second time unit in the fourth part to data in the first second time unit
- the eighth polarity change is a polarity change from data in the third second time unit in the fourth part to data in the second second time unit.
- the reference bit of the first sub-signal carried in the third signal is represented by a second correlation value, and M is equal to 2, if the reference bit is the first value, the second correlation value is a correlation value between the first difference and the second difference; or, if the reference bit is the second value, the second correlation value is a correlation value between the third difference and the fourth difference;
- the first difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the second difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part
- the first difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the second difference is the difference obtained by subtracting the data in the second first time unit in the third part from the data in the target second time unit
- the third difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the fourth difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part
- the third difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the fourth difference is the difference obtained by subtracting the data in the target second time unit from the data in the third part.
- the reference bit of the first sub-signal carried in the third signal is represented by a first correlation value, and M is equal to 3, if the reference bit is the first value, the first correlation value is a correlation value between the fifth difference value and the sixth difference value, or, if the reference bit is the second value, the first correlation value is a correlation value between the seventh difference value and the eighth difference value;
- the fifth difference is a difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the sixth difference is a difference obtained by subtracting the data in the third first time unit from the data in the second first time unit in the third part
- the fifth difference is a difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the sixth difference is a difference obtained by subtracting the data in the second first time unit from the data in the third first time unit
- the seventh difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the eighth difference is the difference obtained by subtracting the data in the third first time unit from the data in the second first time unit in the third part
- the seventh difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the eighth difference is the difference obtained by subtracting the data in the second first time unit from the data in the third first time unit.
- the reference bit of the first sub-signal carried in the third signal is represented by a second correlation value, and M is equal to 3, if the reference bit is the first value, the second correlation value is a correlation value between the ninth difference value and the tenth difference value, or, if the reference bit is the second value, the second correlation value is a correlation value between the eleventh difference value and the twelfth difference value;
- the ninth difference is the difference between the data in the second first time unit in the third part and the data in the first first time unit, and the tenth difference is the difference between the data in the third first time unit in the third part and the data in the first first time unit.
- the ninth difference is the difference between the data in the first first time unit in the third part and the data in the second first time unit; or the ninth difference is the difference between the data in the first first time unit in the third part and the data in the second first time unit, and the tenth difference is the difference between the data in the target second time unit and the data in the third first time unit in the third part;
- the eleventh difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the twelfth difference is the difference obtained by subtracting the data in the target second time unit from the data in the third first time unit in the third part
- the eleventh difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the twelfth difference is the difference obtained by subtracting the data in the target second time unit from the data in the third part.
- the reference bit of the first sub-signal carried in the third signal is represented by a first correlation value, and M is equal to 4, if the reference bit is the first value, the first correlation value is a correlation value between the thirteenth difference value and the fourteenth difference value, or, if the reference bit is the second value, the first correlation value is a correlation value between the fifteenth difference value and the sixteenth difference value;
- the thirteenth difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the fourteenth difference is the difference obtained by subtracting the data in the fourth first time unit from the data in the third first time unit in the third part
- the thirteenth difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the fourteenth difference is the difference obtained by subtracting the data in the third first time unit from the data in the fourth first time unit in the third part
- the fifteenth difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the sixteenth difference is the difference obtained by subtracting the data in the fourth first time unit from the data in the third first time unit in the third part
- the fifteenth difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the sixteenth difference is the difference obtained by subtracting the data in the third first time unit from the data in the fourth first time unit in the third part.
- the first value is equal to 1, and the second value is equal to 0; or, the first value is equal to 0, and the second value is equal to 1.
- the third correlation value is a correlation value between the seventeenth difference value and the eighteenth difference value, or, if the information bit is equal to a fourth value, the third correlation value is a correlation value between the nineteenth difference value and the twentieth difference value;
- the seventeenth difference is the difference obtained by subtracting the data in the third second time unit from the data in the fourth part
- the eighteenth difference is the difference obtained by subtracting the data in the first second time unit from the data in the second second time unit in the fourth part
- the seventeenth difference is the difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part
- the eighteenth difference is the difference obtained by subtracting the data in the fourth part from the data in the third second time unit.
- the nineteenth difference is the difference obtained by subtracting the data in the fourth second time unit from the data in the third second time unit in the fourth part
- the twentieth difference is the difference obtained by subtracting the data in the first second time unit from the data in the second second time unit in the fourth part
- the nineteenth difference is the difference obtained by subtracting the data in the third second time unit from the data in the fourth part
- the twentieth difference is the difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part.
- the third value is equal to 1, and the fourth value is equal to 0; or, the third value is equal to 0, and the fourth value is equal to 1.
- the information sending device 90 provided in the embodiment of the present application can implement each process implemented by the method embodiment shown in Figure 2 and achieve the same technical effect. To avoid repetition, it will not be repeated here.
- FIG. 10 is a schematic diagram of the structure of an information receiving device provided in an embodiment of the present application, and the device is applied to a third device, which is a BSC receiving device, including but not limited to a reader, etc.
- the information receiving device 100 includes:
- the second receiving module 101 is used to receive a third signal sent by the first device; wherein the third signal is obtained by backscattering modulation of the first signal using the second signal, the second signal is constructed according to the number of second devices and the base signal, and the number of second devices is greater than 2; the second device is a device that provides the first signal, and the base signal is a signal that carries bit information through the polarity change between data in adjacent time units, or the base signal is a signal that carries bit information through the correlation value of the difference between data in adjacent time units;
- a construction module 102 configured to construct a fourth signal according to the number of the second devices and the third signal, wherein the fourth signal carries bit information of the base signal;
- the demodulation module 103 is used to demodulate the fourth signal to obtain bit information of the base signal.
- the fourth signal is constructed as follows:
- the fourth signal includes a third part and a fourth part, the third part occupies M first time units, the fourth part occupies E second time units, and M and E are integers greater than or equal to 2;
- the demodulation module 103 is specifically used to:
- the first difference group includes: the difference between the data in the second first time unit in the third part and the data in the first first time unit, and the difference between the data in the fourth first time unit in the third part and the data in the third first time unit; or, the first difference group includes: the difference between the data in the first first time unit in the third part and the data in the second first time unit, and the difference between the data in the third first time unit in the third part and the data in the fourth first time unit; the second difference group includes: the difference between the data in the second second time unit in the fourth part and the data in the first second time unit, and the difference between the data in the fourth second time unit in the fourth part and the data in the third second time unit; or, the second difference group includes: the difference between the data in the first second time unit in the fourth part and the data in the second second time unit, and the difference between the data in the third first time unit in the fourth part and the data in the fourth first time unit.
- the first difference group includes: the difference between the data in the second first time unit in the third part and the data in the first first time unit, and the difference between the data in the third first time unit in the third part and the data in the second first time unit; or, the first difference group includes: the difference between the data in the first first time unit in the third part and the data in the second first time unit, and the difference between the data in the second first time unit in the third part and the data in the third first time unit; the second difference group includes: the difference between the data in the second second time unit in the fourth part and the data in the first second time unit, and the difference between the data in the third second time unit in the fourth part and the data in the second second time unit, or, the second difference group includes: the difference between the data in the first second time unit in the fourth part and the data in the second second time unit, and the difference between the data in the second second time unit in the fourth part and the data in the third second time unit.
- P fourth signals are correspondingly constructed, where P is an integer greater than or equal to 2; the demodulation module 103 is further used to:
- the demodulation module 103 is also used to: according to a preset modulation rule, when the fourth correlation value is greater than or equal to the fifth correlation value, determine that the bit information of the base signal is a first value, or, when the fourth correlation value is less than the fifth correlation value, determine that the bit information of the base signal is a second value.
- the first value is equal to 1, and the second value is equal to 0; or, the first value is equal to 0, and the second The value is equal to 1.
- the fourth signal includes a third part and a fourth part, the third part occupies M first time units, the fourth part occupies E second time units, the M is an integer greater than or equal to 2, and the E is an integer greater than or equal to 4;
- the demodulation module 103 is specifically used to:
- a sixth correlation value when the reference bit carried in the fourth signal is a first value, construct a seventh correlation value when the reference bit carried in the fourth signal is a second value, and construct an eighth correlation value of the difference between data in adjacent second time units in the fourth part; wherein the reference bit corresponds to the first sub-signal in the base signal, the sixth correlation value is a value related to the difference between data in adjacent first time units in the third part, and the seventh correlation value is a value related to the difference between data in adjacent first time units in the third part; according to the sixth correlation value, the seventh correlation value and the eighth correlation value, demodulate to obtain the information bit of the second sub-signal in the base signal.
- the sixth correlation value is a correlation value between the twenty-first difference and the twenty-second difference
- the seventh correlation value is a correlation value between the twenty-third difference and the twenty-fourth difference
- the twenty-first difference is the difference obtained by subtracting the data in the first first time unit from the data in the second first time unit in the third part
- the twenty-second difference is the difference obtained by subtracting the data in the target second time unit from the data in the second first time unit in the third part
- the twenty-first difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the twenty-second difference is the difference obtained by subtracting the data in the second first time unit in the third part from the data in the target second time unit
- the twenty-third difference is the difference obtained by subtracting the data in the second first time unit from the data in the first first time unit in the third part
- the twenty-fourth difference is the difference obtained by subtracting the data in the second first time unit in the third part from the data in the target second time unit
- the twenty-third difference is the difference obtained by subtracting the data in the first time unit from the data in the second first time unit in the third part
- the twenty-fourth difference is the difference
- the eighth correlation value is a correlation value between the twenty-fifth difference and the twenty-sixth difference, or the eighth correlation value is a correlation value between the twenty-seventh difference and the twenty-eighth difference;
- the twenty-fifth difference is the difference obtained by subtracting the data in the third second time unit from the data in the fourth part
- the twenty-sixth difference is the difference obtained by subtracting the data in the first second time unit from the data in the second second time unit in the fourth part
- the twenty-fifth difference is the difference obtained by subtracting the data in the second second time unit from the data in the first second time unit in the fourth part
- the twenty-sixth difference is the difference obtained by subtracting the data in the fourth second time unit from the data in the third second time unit in the fourth part
- the twenty-seventh difference is the difference obtained by subtracting the data in the fourth second time unit from the data in the third second time unit in the fourth part
- the twenty-eighth difference is The difference between the data in the second second time unit in the fourth part and the data in the first second time unit
- the twenty-seventh difference is the difference between the data in the fourth second time unit in the fourth part and the data in the third second time unit
- Z fourth signals are correspondingly constructed, where Z is an integer greater than or equal to 2;
- the sixth correlation value is a correlation value determined according to a third average difference value group, and the third average difference value is obtained by averaging the differences included in the third difference value group in the Z fourth signals;
- the third difference value group includes a twenty-ninth difference value, or the third difference value group includes a twenty-ninth difference value and a thirtieth difference value, the twenty-ninth difference value includes a difference between data in adjacent first time units in the third part of the fourth signal when the reference bit is the first value, and the thirtieth difference value includes a difference between data in an Mth first time unit in the third part of the fourth signal and data in a target second time unit, and the target second time unit is any second time unit in the fourth part of the fourth signal;
- the seventh correlation value is a correlation value determined according to a fourth average difference value group, the fourth average difference value is obtained by averaging the differences included in the fourth difference value group in the Z fourth signals;
- the fourth difference value group includes a thirty-first difference value, or the fourth difference value group includes a thirty-first difference value and a thirty-second difference value,
- the thirty-first difference value includes a difference between data in adjacent first time units in the third part of the fourth signal when the reference bit is a second value
- the thirty-second difference value includes a difference between data in an Mth first time unit in the third part of the fourth signal and data in a target second time unit, the target second time unit being any second time unit in the fourth part of the fourth signal;
- the eighth correlation value is a correlation value determined based on the fifth average difference group, which is obtained by averaging the differences included in the fifth difference group in the Z fourth signals, and the fifth difference group includes the differences between data in adjacent second time units in the fourth part of the fourth signal.
- the demodulation module 103 is specifically used to: based on a pre-established relationship between reference bits and information bits, for the fourth part, when the product of the eighth correlation value and the sixth correlation value is greater than or equal to the product of the eighth correlation value and the seventh correlation value, determine that the information bit of the second sub-signal is a third value; or, when the product of the eighth correlation value and the sixth correlation value is less than the product of the eighth correlation value and the seventh correlation value, determine that the information bit of the second sub-signal is a fourth value.
- the third value is equal to 1, and the fourth value is equal to 0; or, the third value is equal to 0, and the fourth value is equal to 1.
- the information receiving device 100 provided in the embodiment of the present application can implement each process implemented by the method embodiment shown in Figure 8 and achieve the same technical effect. To avoid repetition, it will not be repeated here.
- the embodiment of the present application further provides a communication device 110, including a processor 111 and a memory 112, wherein the memory 112 stores a program or instruction that can be run on the processor 111.
- the communication device 110 is a first device
- the program or instruction is executed by the processor 111 to implement the various steps of the above-mentioned information sending method embodiment, and can achieve the same technical effect.
- the communication device 110 is a third device
- the program or instruction is executed by the processor 111.
- the various steps of the above-mentioned information receiving method embodiment can achieve the same technical effect, and will not be described again here to avoid repetition.
- An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored.
- a program or instruction is stored.
- the various processes of the above-mentioned information sending method embodiment are implemented, or the various processes of the above-mentioned information receiving method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.
- the processor is the processor in the terminal described in the above embodiment.
- the readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.
- the readable storage medium may be a non-transient readable storage medium.
- An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned information sending method embodiment, or to implement the various processes of the above-mentioned information receiving method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
- the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.
- the embodiments of the present application further provide a computer program/program product, which is stored in a storage medium, and is executed by at least one processor to implement the various processes of the above-mentioned information sending method embodiment, or to implement the various processes of the above-mentioned information receiving method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.
- An embodiment of the present application also provides a wireless communication system, which includes at least two of a first device, a second device, and a third device, wherein the first device is used to implement the steps of the above-mentioned information sending method, and the third device is used to implement the steps of the above-mentioned information receiving method.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
本申请公开了一种信息发送方法、接收方法、装置、设备及可读存储介质,属于通信技术领域,本申请实施例的信息发送方法包括:第一设备接收第一信号;利用第二信号对所述第一信号进行反向散射调制,生成第三信号;其中,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2,所述第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;发送所述第三信号。
Description
相关申请的交叉引用
本申请主张在2023年06月06日在中国提交的中国专利申请No.202310668966.1的优先权,其全部内容通过引用包含于此。
本申请属于通信技术领域,具体涉及一种信息发送方法、接收方法、装置、设备及可读存储介质。
为了有效的提高反向散射通信系统中的前向覆盖,相关技术中提出了多基地通信架构,通过多个激励源或读写器(Reader)来同时给反向散射通信设备或者极低功耗通信设备提供射频载波信号,从而提高反向散射通信系统或极低功耗通信系统的前向覆盖。然而,这种情况下,目标Reader会受到其它Reader的同频直接链路干扰,并且信号强度也会远大于反向散射信号或目标传输信号,因而想要恢复出有用的反向散射调制信号或目标传输信号的难度很大。因此,如何高效地消除多基地反向散射通信架构下的多直接链路干扰是目前急需解决的问题。
发明内容
本申请实施例提供一种信息发送方法、接收方法、装置、设备及可读存储介质,能够解决如何高效地消除多基地反向散射通信架构下的多直接链路干扰的问题。
第一方面,提供了一种信息发送方法,包括:
第一设备接收第一信号;
所述第一设备利用第二信号对所述第一信号进行反向散射调制,生成第三信号;其中,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;所述第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;
所述第一设备发送所述第三信号。
第二方面,提供了一种信息接收方法,包括:
第三设备接收第一设备发送的第三信号;其中,所述第三信号是利用第二信号对第一信号进行反向散射调制得到的,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;第二设备是提供所述第一信号的设备,所述基信号是通过相邻
时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;
所述第三设备根据所述第二设备的个数和所述第三信号,构建第四信号,所述第四信号中携带有所述基信号的比特信息;
所述第三设备对所述第四信号进行解调制,获得所述基信号的比特信息。
第三方面,提供了一种信息发送装置,应用于第一设备,包括:
第一接收模块,用于接收第一信号;
调制模块,用于利用第二信号对所述第一信号进行反向散射调制,生成第三信号;其中,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;所述第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;
发送模块,用于发送所述第三信号。
第四方面,提供了一种信息接收装置,应用于第三设备,包括:
第二接收模块,用于接收第一设备发送的第三信号;其中,所述第三信号是利用第二信号对第一信号进行反向散射调制得到的,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;
构建模块,用于根据所述第二设备的个数和所述第三信号,构建第四信号,所述第四信号中携带有所述基信号的比特信息;
解调制模块,用于对所述第四信号进行解调制,获得所述基信号的比特信息。
第五方面,提供了一种通信设备,该通信设备包括处理器和存储器,所述存储器存储可在所述处理器上运行的程序或指令,所述程序或指令被所述处理器执行时实现如第一方面所述的方法的步骤,或者如第二方面所述的方法的步骤。
第六方面,提供了一种可读存储介质,所述可读存储介质上存储程序或指令,所述程序或指令被处理器执行时实现如第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤。
第七方面,提供了一种无线通信系统,所述无线通信系统包括第一设备、第二设备、第三设备中的至少两个,所述第一设备用于实现如第一方面所述的方法的步骤,所述第三设备用于实现如第二方面所述的方法的步骤。
第八方面,提供了一种芯片,所述芯片包括处理器和通信接口,所述通信接口和所述处理器耦合,所述处理器用于运行程序或指令,实现如第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤。
第九方面,提供了一种计算机程序/程序产品,所述计算机程序/程序产品被存储在存储
介质中,所述程序/程序产品被至少一个处理器执行以实现如第一方面所述的方法的步骤,或者实现如第二方面所述的方法的步骤。
在本申请实施例中,通过接收第一信号,利用第二信号对所述第一信号进行反向散射调制,生成并发送第三信号,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2,所述第二设备是提供第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况或者差值的相关值携带比特信息的信号,可以在多基地反向散射通信的场景下,一方面利用基信号的多层极性差来高效地消除多直接链路干扰,一方面利用基信号中相邻时间单元中的数据之间的极性变化情况或者差值的相关值来携带比特信息,使得信号接收端只需要通过简单的极性判断或者相关值比较就可以完成多直接链路干扰消除和调制信号解调。
图1A是本申请实施例可应用的一种单基地反向散射通信系统的框图;
图1B是本申请实施例可应用的一种双基地反向散射通信系统的框图;
图1C是本申请实施例可应用的一种多基地反向散射通信系统的框图;
图2是本申请实施例提供的一种信息发送方法的流程图;
图3是本申请实施例中的第一基本单元的示意图;
图4A是本申请实施例中集中式方式分布的信号示意图;
图4B是本申请实施例中分布式方式分布的信号示意图;
图5A至图5D是本申请实例1中的时隙示意图;
图6A至图6H是本申请实例2中的时隙示意图;
图7A至图7D是本申请实例3中的时隙示意图;
图8是本申请实施例提供的一种信息接收方法的流程图;
图9是本申请实施例提供的一种信息发送装置的结构示意图;
图10是本申请实施例提供的一种信息接收装置的结构示意图;
图11是本申请实施例提供的一种通信设备的结构示意图。
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚描述,显然,所描述的实施例是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员所获得的所有其他实施例,都属于本申请保护的范围。
本申请的术语“第一”、“第二”等是用于区别类似的对象,而不用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换,以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施,且“第一”、“第二”所区别的对象通常为一类,并不限定对象的个数,例如第一对象可以是一个,也可以是多个。此外,本申请
中的“或”表示所连接对象的至少其中之一。例如“A或B”涵盖三种方案,即,方案一:包括A且不包括B;方案二:包括B且不包括A;方案三:既包括A又包括B。字符“/”一般表示前后关联对象是一种“或”的关系。
本申请的术语“指示”既可以是一个直接的指示(或者说显式的指示),也可以是一个间接的指示(或者说隐含的指示)。其中,直接的指示可以理解为,发送方在发送的指示中明确告知了接收方具体的信息、需要执行的操作或请求结果等内容;间接的指示可以理解为,接收方根据发送方发送的指示确定对应的信息,或者进行判断并根据判断结果确定需要执行的操作或请求结果等。
值得指出的是,本申请实施例所描述的技术不限于长期演进型(Long Term Evolution,LTE)/LTE的演进(LTE-Advanced,LTE-A)系统,还可用于其他无线通信系统,诸如码分多址(Code Division Multiple Access,CDMA)、时分多址(Time Division Multiple Access,TDMA)、频分多址(Frequency Division Multiple Access,FDMA)、正交频分多址(Orthogonal Frequency Division Multiple Access,OFDMA)、单载波频分多址(Single-carrier Frequency-Division Multiple Access,SC-FDMA)或其他系统。本申请实施例中的术语“系统”和“网络”常被可互换地使用,所描述的技术既可用于以上提及的系统和无线电技术,也可用于其他系统和无线电技术。以下描述出于示例目的描述了新空口(New Radio,NR)系统,并且在以下大部分描述中使用NR术语,但是这些技术也可应用于NR系统以外的系统,如第6代(6th Generation,6G)通信系统。
为了便于理解本申请实施例,首先说明以下内容。
反向散射通信(Backscatter Communication,BSC)是指反向散射通信设备利用其它设备或者环境中的射频信号进行信号调制来传输自己信息,是一种比较典型的无源物联设备。反向散射通信发送端的基本构成模块及主要功能包括:
-天线单元:用于接收射频信号、控制命令,同时用于发送调制的反向散射信号。
-能量采集模块或供能模块:该模块用于反向散射通信设备进行射频能量采集,或者其它能量采集,包括但不限于太阳能、动能、机械能、热能等。另外除了包括能量采集模块,也可能包括电池供能模块,此时反向散射通信设备为半无源设备。能量采集模块或供能模块给设备中的其它所有模块进行供电。
-微控制器:包括控制基带信号处理、储能或数据调度状态、开关切换、系统同步等。
-信号接收模块:用于解调反向散射通信接收端或是其它网络节点发送的控制命令或数据等。
-信道编码和调制模块:在控制器的控制下进行信道编码和信号调制,并通过选择开关在控制器的控制下通过选择不同的负载阻抗来实现调制。
-存储器或传感模块:用于存储设备的标识ID信息、位置信息或是传感数据等。
除了上述典型的构成模块之外,未来的反向散射通信发送端还可以集成隧道二极管放大器模块、低噪声放大器模块等,用于提升发送端的接收灵敏度和发送功率。
可选地,反向散射通信接收端的基本构成模块及主要功能包括:
-天线单元:用于接收调制的反向散射信号。
-反向散射信号检波模块:用于对反向散射通信发送端发送的反向散射信号进行检波,包括但不限于幅移键控(Amplitude Shift Keying,ASK)检波、相移键控(Phase Shift Keying,PSK)检波、频移键控(Frequency Shift Keying,FSK)检波或正交幅度调制(Quadrature Amplitude Modulation,QAM)检波等。
-解调和解码模块:对检波出的信号进行解调制和解码,以恢复出原始信息流。
图1A示出了本申请实施例可应用的一种单基地反向散射通信系统(Monostatic Backscatter Communication System,MBCSs)的示意图。MBCS系统包括BSC发送设备(比如标签Tag)和读写器Reader,读写器Reader中包含RF射频源和BSC接收设备,RF射频源用于产生RF射频信号从而来给BSC发送设备/Tag供能。BSC发送设备反向散射经过调制后的RF射频信号,Reader中的BSC接收设备接收到该反向散射信号后进行信号解调。由于从BSC发送设备发送出去的RF射频信号会经过往返信号的信号衰减引起的双倍远近效应,因而信号的能量衰减大,因而MBCS系统一般用于短距离的反向散射通信,比如传统的RFID应用。
图1B示出了本申请实施例可应用的一种双基地反向散射通信系统(Bistatic Backscatter Communication Systems,BBCSs)的示意图。不同于单基地反向散射通信系统(Monostatic Backscatter Communication System,MBCSs),BBCS系统中的RF射频源、BSC发送设备和BSC接收设备是分开的,故可以避免往返信号衰减大的问题。另外,通过合理的放置RF射频源的位置可以进一步提高BBCS通信系统的性能。值得注意的是,环境反向散射通信系统ABCSs也是双基地反向散射通信系统的一种,但与BBCS系统中的射频源为专用的信号射频源不同,ABCS系统中的射频源可以是可用的环境中的射频源,比如:电视塔、蜂窝基站、WiFi信号、蓝牙信号等。
受限于反向散射通信设备的接收灵敏度,反向散射通信系统的前向链路(或称为:下行链路)相比反向链路(即称为:上行链路)覆盖受限。为了有效的提高反向散射通信系统中的前向(即下行)覆盖,相关技术中提出了多基地反向散射通信架构,通过多个激励源来同时给反向散射通信设备提供射频载波信号,从而提高反向散射通信系统的前向(即下行)覆盖。下面以每个读写器和反向散射通信设备都是单基地架构为例描述多基地反向散射通信架构及对应的信号模型。
如图1C所示,假设存在K(K≥2)个Reader以及一个单天线的Tag,即BSC UE(反向散射通信用户设备),每个Reader都是单基地架构,且配置了1根发送天线以及M(M≥1)根接收天线。假设每个Reader到Tag的信道都是平坦且慢衰落的信道,即在相干时间内所有的信道系数都是不变的。定义第k个Reader到Tag,Tag到第k个Reader,第i个Reader到第k个Reader的信道系数分别表示为:
hk(t)=ah,kδ(t-τh,k)
fk(t)=ah,kδ(t-τf,k)
gk,i(t)=ag,k,iδ(t-τg,k,i)
hk(t)=ah,kδ(t-τh,k)
fk(t)=ah,kδ(t-τf,k)
gk,i(t)=ag,k,iδ(t-τg,k,i)
假设每个Reader发送的都是单音连续波sk(t),表示为:
其中,Ps表示信号的平均发送功率,fc是Reader发送的射频载波信号的载波频率,Δfk表示由于晶振不准导致的频率偏移,φk表示初始相位。Tag端的接收信号为:
Tag对接收到的射频载波信号c(t)进行调制,并调制自己的信息x(t)。假设α表示Tag的反射系数,则第k个Reader接收到的反向散射信号为:
与此同时,第k个Reader同时也接收到来自于其它Reader的同频段强直接链路干扰,表示为:
因此,第k个Reader接收到的信号为:
其中,分别表示对应信道的信道传输时延引入的相位,表示第k个Reader接收到的噪声信号。
可选地,本申请实施例适用的场景包括多基地反向散射通信系统,比如图1C所示的基于单基地架构的多基地反向散射通信系统。
下面结合附图,通过一些实施例及其应用场景对本申请实施例提供的信息发送方法、接收方法、装置、设备及可读存储介质进行详细地说明。
请参见图2,图2是本申请实施例提供的一种信息发送方法的流程图,该方法由第一设备执行,该第一设备为BSC发送设备,包括但不限于标签Tag、无源或半无源的物联网(Internet of Things,IoT)设备等。如图2所示,该方法包括如下步骤:
步骤21:第一设备接收第一信号。
这里,所述第一信号为用于提供射频载波和/或射频供能的信号,可以称为载波信号、射频信号、射频载波信号等,对此不作限定。第一设备可以接收多个第二设备发送的第一信号。所述第二设备为射频源,比如单基地结构下的Reader等。
步骤22:第一设备利用第二信号对第一信号进行反向散射调制,生成第三信号。
这里,所述第二信号是根据第二设备的个数和基信号构建得到,以利用基信号的多层极性差来消除多直接链路干扰。所述第二设备的个数大于2。所述第二设备是提供第一信号的设备,比如为单基地结构下的Reader等。所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号。
所述第一设备知道第二设备的个数/数目K,K>2。K的取值可以是网络配置或指示的,也可以是第一设备通过检测序列等方式自己检测或估计得到的。
在一些实施例中,所述时间单元可以包括但不限于以下任一项:符号(symbol)、时隙(slot)、子帧(subframe)、帧(frame)等。
在一些实施例中,所述第二信号可以称为基带信号或调制信号x(n)。
步骤23:第一设备发送第三信号。
在一些实施例中,将调制信号x(n)调制之后的信号可以反射系数α反向散射传输。
这样,可以在多基地反向散射通信的场景下,一方面利用基信号的多层极性差来高效地消除多直接链路干扰,一方面利用基信号中相邻时间单元中的数据之间的极性变化情况或者差值的相关值来携带比特信息,使得BSC接收端只需要通过简单的极性判断或者相关值比较就可以完成多直接链路干扰消除和调制信号解调。
可选地,对于K个第二设备,所述第二信号x(n)的构建过程包含如下步骤:
S1:将k初始化为K-2,K为第二设备的个数/数目;
S2:当满足k≥1时,执行如下过程,直至k<1,并执行x[n]=b[n],n=0,…,L-1,所述L为第二信号的长度:
执行b[n+L/2k]=-b[n],和将k设置为k-1。
上述构建过程中,b[n]为通过相邻时间单元中的数据之间的极性变化情况或者差值的相关值来携带比特信息的基信号,n=0,…,L/2K-2,L/2K-2为基信号的长度。经过上述构建过程后,可以获得长度为L的第二信号x(n)。x(n)是由基信号b[n]构建的调制信号,可理解为将基信号进行多层扩展,以利用基信号的多层极性差来高效地消除多直接链路干扰。
可选地,为了满足多基地反向散射通信架构下的调制需求,所述第一信号包括2K-2个第一基本单元,每个第一基本单元的长度为L/2K-2,每个第一基本单元包括第一部分和第二部分,所述第一部分占用M个第一时间单元,所述M个第一时间单元中的数据相同,所述第二部分占用E个第二时间单元,所述E个第二时间单元中的数据相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同或者相反,所述M和E为大于或等于2的整数。对于两个时间单元中的数据相反,可理解为该两个时间单元中的数据的极性相反。比如,一个时间单元中的数据的极性为负,另一个时间单元中的数据的极性为正;或者,一个时间单元中的数据的极性为正,另一个时间单元中的数据的极性为负。
可选地,所述第一时间单元和第二时间单元为相同类型的时间单元,可以包括以下任一项:符号(symbol)、时隙(slot)、子帧(subframe)、帧(frame)等。比如,第一时间单
元和第二时间单元都为时隙,或者,第一时间单元和第二时间单元都为帧,或者,第一时间单元和所述第二时间单元都为符号。
在一些实施例中,所述第一部分可选为参考时隙块(Reference slots),所述参考时隙块中包括完全相同的M个slot。所述第二部分可选为信息时隙块(Information slots),所述信息时隙块中包括完全相同的E个slot。这两部分组成的一个基本时隙块。
可选地,所述第一时间单元对应的数据长度为N,所述第二时间单元对应的数据长度为N,所述N为大于第一阈值的正整数,所述N可以是随机的。所述第一阈值为与信道时延相关的值,至少大于信道时延值,可以基于实际需求设置。
在一些实施例中,如果第一时间单元和第二时间单元对应的数据长度为N,则所述第一信号中每个第一基本单元的长度需要满足:(M+E)×N=L/2K-2,L为一个调制信号即第二信号的长度,K为第二设备的个数/数目。
在一些实施例中,所述第一信号可以表示为s(t),满足如下的时域结构:
其中,m的取值范围为0至M+E,当0≤m<M时,表示相应的第一时间单元,而当M≤m<M+E时,表示相应的第二时间单元。n的取值范围为0至N-1,表示第一时间单元/第二时间单元中的数据采样值或数据符号。x(n)表示第一时间单元/第二时间单元中的第n个数据符号或数据采样值。c∈{1,-1}表示第二部分相对于第一部分的极性。比如,若c=1,则第一时间单元和第二时间单元中的数据的极性相同,而若c=-1,则第一时间单元和第二时间单元中的数据的极性相反。
在一些实施例中,以第一时间单元和第二时间单元都为时隙(slot)为例,所述第一信号中每个第一基本单元的结构可以如图3所示,其中,第一部分包含M个slot,第二部分包含E个slot。
可选地,对于第一时间单元和第二时间单元中的数据,可以是采用非随机序列或随机序列生成。比如,第一时间单元和第二时间单元中的数据可以是根据二阶切比雪夫Chebyshev多项式函数,生成的混沌序列,该混沌序列为非随机序列,可以表示为:x(n+1)=1-2x2(n)。n的取值范围为0至N-1,表示第一时间单元/第二时间单元中的数据位置,x(n)表示第一时间单元/第二时间单元中的第n个数据符号或数据采样值。
可选地,为了进行噪声平滑,每个第二设备(即射频源)在发送第一信号时,可以发送P个重复的第一信号,每个第一信号为基本信号,所述P个重复的第一信号以集中式方式或分布式方式分布,所述P为大于或等于2的整数。对于集中式方式,为P个重复的第一信号集中在一起分布。对于分布式方式,为P个重复的第一信号间隔分布。
比如,P个重复的第一信号以集中式方式分布时,可以如图4A所示;或者,P个重复的第一信号以分布式方式分布时,可以如图4B所示。
可选地,在上述的第一信号的基础上,所述第三信号包括2K-2个第二基本单元,每个第二基本单元的长度为L/2K-2,每个第二基本单元包括第三部分和第四部分,所述第三部
分占用M个第一时间单元,所述第四部分占用E个第二时间单元。所述基信号包括第一子信号和第二子信号,当利用第二信号对第一信号进行反向散射调制时,所述第一子信号用于调制所述第一部分得到相应的第三部分,所述第二子信号用于调制所述第二部分得到相应的第四部分。
所述基信号的调制特征可以满足以下任一项:
调制特征1:通过基信号的相邻时间单元中的数据之间的极性变化情况携带比特信息;即经过基信号的调制后,所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述第一变化情况与所述第二变化情况不相同,所述第一变化情况为所述第三部分中的每两个相邻的第一时间单元中的数据的极性变化之间的同异情况,所述第二变化情况为所述第四部分中的每两个相邻的第二时间单元中的数据的极性变化之间的同异情况;比如,第一变化情况为对应的极性变化相同,第二变化情况为对应的极性变化相反;或者,第一变化情况为对应的极性变化相反,第二变化情况为对应的极性变化相同;
调制特征2:通过基信号的相邻时间单元中的数据之间的差值的相关值携带比特信息;即经过基信号的调制后,所述第三信号中携带的所述第一子信号的参考比特用第一相关值或第二相关值表征,所述第一相关值为所述第三部分中的相邻第一时间单元中的数据之间的差值的相关值,此时参考比特单独用第三部分的相关值表征;所述第二相关值为第三时间单元中的相邻时间单元中的数据之间的差值的相关值,所述第三时间单元包括所述第三部分中的M个第一时间单元和目标第二时间单元,所述目标第二时间单元为所述第四部分中的任一第二时间单元,优先为第一个第二时间单元,此时参考比特还需借助第四部分来表征;所述第三信号中携带的所述第二子信号的信息比特用第三相关值表征,所述第三相关值为所述第四部分中的相邻第二时间单元中的数据之间的差值的相关值。这个信息比特可理解为基信号中携带的比特信息,而参考比特是用于解调制得到信息比特的参考信息。
下面分情况对调制特征1和调制特征2进行详细的说明。
调制特征1
在获得第三部分中的每两个相邻的第一时间单元中的数据的极性变化时,可以结合第三部分中包含的第一时间单元的个数M,考虑M的奇偶性,顺次计算相邻两个第一时间单元中的数据的极性变化;在获得第四部分中的每两个相邻的第二时间单元中的数据的极性变化时,可以结合第四部分中包含的第二时间单元的个数E,考虑E的奇偶性,顺次计算相邻两个第二时间单元中的数据的极性变化,只要满足利用相邻时间单元间极性变化模式来携带比特信息即可。
可选地,当所述第三信号中携带的所述基信号的比特信息用第三部分的第一变化情况与第四部分的第二变化情况表征,所述M和E等于4时,若所述比特信息为第一值,则所述第一变化情况为第一极性变化与第二极性变化相同,所述第二变化情况为第三极性变化与第四极性变化相反;或者,若所述比特信息为第二值,则所述第一变化情况为第一极性
变化与第二极性变化相反,所述第二变化情况为第三极性变化与第四极性变化相同。其中,所述第一极性变化为所述第三部分中的第一个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化,所述第二极性变化为所述第三部分中的第三个第一时间单元中的数据到第四个第一时间单元中的数据的极性变化;或者,所述第一极性变化为所述第三部分中的第二个第一时间单元中的数据到第一个第一时间单元中的数据的极性变化,所述第二极性变化为所述第三部分中的第四个第一时间单元中的数据到第三个第一时间单元中的数据的极性变化。所述第三极性变化为所述第四部分中的第一个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化,所述第四极性变化为所述第四部分中的第三个第二时间单元中的数据到第四个第二时间单元中的数据的极性变化;或者,所述第三极性变化为所述第四部分中的第二个第二时间单元中的数据到第一个第二时间单元中的数据的极性变化,所述第四极性变化为所述第四部分中的第四个第二时间单元中的数据到第三个第二时间单元中的数据的极性变化。
可选地,当所述第三信号中携带的基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述M和E等于3时,若所述比特信息为第一值,则所述第一变化情况为第五极性变化与第六极性变化相同,所述第二变化情况为第七极性变化与第八极性变化相反;或者,若所述比特信息为第二值,则所述第一变化情况为第五极性变化与第六极性变化相反,所述第二变化情况为第七极性变化与第八极性变化相同。其中,所述第五极性变化为所述第三部分中的第一个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化,所述第六极性变化为所述第三部分中的第二个第一时间单元中的数据到第三个第一时间单元中的数据的极性变化;或者,所述第五极性变化为所述第三部分中的第二个第一时间单元中的数据到第一个第一时间单元中的数据的极性变化,所述第六极性变化为所述第三部分中的第三个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化。所述第七极性变化为所述第四部分中的第一个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化,所述第八极性变化为所述第四部分中的第二个第二时间单元中的数据到第三个第二时间单元中的数据的极性变化;或者,所述第七极性变化为所述第四部分中的第二个第二时间单元中的数据到第一个第二时间单元中的数据的极性变化,所述第八极性变化为所述第四部分中的第三个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化。
可选地,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二值等于1。这样借助0和1的设置,可以简化调制信号的解调过程。
需指出的,上述实施例中,虽然以M和E等于3或4为例进行说明,但本申请实施例不以此为限,上述M和E也可以取其他值,比如M和E等于5、6或8等。
下面以第一时间单元和第二时间单元都为时隙(slot),M和E等于4或3为例,对本申请实施例中的调制过程进行说明。
实例1
本实例1中,第一信号的每个第一基本单元中,第一部分包含4个slot,第二部分包含4个slot,即M和E等于4,假设基信号b(t)包含第一子信号bR(mN+n)和第二子信号bD(mN+b),当0≤m<M时对应第一子信号,当M≤m<M+E时对应第二子信号,mod表示取余数符号,则第一子信号与第一部分对应,用于调制第一部分得到第三信号中相应的第三部分;第二子信号与第二部分对应,用于调制第二部分得到第三信号中相应的第四部分。基信号b(t)可以满足如下任一情况:
情况一:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图5A所示,第一子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。第二子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图5A所示,第一子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第三部分经第一子信号调制得
到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。第二子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况二:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图5B所示,第一子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。第二子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图5B所示,第一子信号中的slot 1到slot 2为从低电平变化到高电平即极性变
化为正,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。第二子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;而由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况三:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图5C所示,第一子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为负,slot 3到slot 4为从低电平变化到高电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。第二子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图5C所示,第一子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。第二子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况四:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图5D所示,第一子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。第二子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;而由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图5D所示,第一子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从低电平变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相反。第二子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 3到slot 4为从高电平变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 3到slot 4的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
同理,在另外的实现方式中,也可以:当第三部分中相邻slot对应的极性变化相反,第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为1;而当第三部分中相邻slot对应的极性变化相同,第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为0。具体调制过程与上述过程类似,在此不再赘述。
这样,可以利用第三部分/第四部分中相邻slot对应的极性变化情况来携带比特信息,从而只需要通过对调制后的第三部分和第四部分之间进行极性判断就可以完成调制信号解调,从而降低BSC调制信号解调复杂度。
实例2
本实例2中,第一信号的每个第一基本单元中,第一部分包含3个slot,第二部分包含3个slot,即M和E等于3。假设基信号b(t)包含第一子信号bR(mN+n)和第二子信号bD(mN+n),当0≤m<M时对应第一子信号,当M≤m<M+E时对应第二子信号,mod表示取余数符号,则第一子信号与第一部分对应,用于调制第一部分得到第三信号中相应的第三部分;第二子信号与第二部分对应,用于调制第二部分得到第三信号中相应的第四部分。基信号b(t)可以满足如下任一情况:
情况一:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6A所示,第一子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到电平0即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6A所示,第一子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到电平0即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况二:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6B所示,第一子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到电平0即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;而由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6B所示,第一子信号中的slot 1到slot 2为从低电平变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到电平0即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况三:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6C所示,第一子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从电平0变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6C所示,第一子信号中的slot 1到slot 2为从电平0变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况四:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6D所示,第一子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从电平0变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6D所示,第一子信号中的slot 1到slot 2为从电平0变化到高电平即极性变化为正,slot 2到slot 3为从高电平变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况五:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6E所示,第一子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从电平0变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6E所示,第一子信号中的slot 1到slot 2为从电平0变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况六:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6F所示,第一子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从电平0变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第三信号的第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6F所示,第一子信号中的slot 1到slot 2为从电平0变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三信号的第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况七:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6G所示,第一子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到电平0即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6G所示,第一子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到电平0即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从低电平变化到电平0即极性变化为正,slot 2到slot 3为从电平0变化到高电平即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
情况八:如果第一设备发送比特信息B=1,即基信号的比特信息为1,则有:
此时如图6H所示,第一子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。第二子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到电平0即极性变化为正,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。也就是说,当所述第三部分中相邻slot对应的极性变化相同,所述第四部分中相邻slot对应的极性变化相反时,相应第三信号中携带的比特信息为1。
而如果第一设备发送比特信息B=0,即基信号的比特信息为0,则有:
此时如图6H所示,第一子信号中的slot 1到slot 2为从高电平变化到低电平即极性变化为负,slot 2到slot 3为从低电平变化到电平0即极性变化为正,第一子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反;由于第三部分经第一子信号调制得到,第三部分的极性变化与第一子信号的极性变化是相同的,因此,第三部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相反。第二子信号中的slot 1到slot 2为从高电平变化到电平0即极性变化为负,slot 2到slot 3为从电平0变化到低电平即极性变化为负,第二子信号中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同;由于第四部分经第二子信号调制得到,第四部分的极性变化与第二子信号的极性变化是相同的,因此,第四部分中的slot 1到slot 2的极性变化与slot 2到slot 3的极性变化相同。也就是说,当所述第三部分中相邻slot对应的极性变化相反,所述第四部分中相邻slot对应的极性变化相同时,相应第三信号中携带的比特信息为0。
同理,在另外的实现方式中,也可以:当第三部分中相邻slot对应的极性变化相反,第四部分中相邻slot对应的极性变化相同时,相应调制后信号中携带的比特信息为1;而当第三部分中相邻slot对应的极性变化相同,第四部分中相邻slot对应的极性变化相反时,相应调制后信号中携带的比特信息为0。具体调制过程与上述过程类似,在此不再赘述。
这样,可以利用第三部分/第四部分中相邻slot对应的极性变化情况来携带比特信息,从而只需要通过对调制后的第三部分和第四部分之间进行极性判断就可以完成调制信号解调,从而降低BSC调制信号解调复杂度。
调制特征2
此调制特征2下,由基信号的相邻时间单元中的数据之间的差值的相关值来携带比特信息。当所述第三信号中携带的所述第一子信号的参考比特用第二相关值表征,所述M等于2时,需借位而结合目标部分来确定参考比特相关值。若所述参考比特为第一值,则所述第二相关值为第一差值与第二差值的相关值;或者,若所述参考比特为第二值,则所述第二相关值为第三差值与第四差值的相关值。其中,所述第一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二差值为所述第三部分中的第二个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二差值为所述目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值。所述第三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第四差值为所述第三部分中的第二个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第四差值为所述目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值。
可选地,当所述第三信号中携带的所述第一子信号的参考比特用第一相关值表征,所述M等于3时,可以单独用第三部分来确定参考比特相关值。若所述参考比特为第一值,则所述第一相关值为第五差值与第六差值的相关值,或者,若所述参考比特为第二值,则所述第一相关值为第七差值与第八差值的相关值。其中,所述第五差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第六差值为所述第三部分中的第二个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;或者,所述第五差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第六差值为所述第三部分中的第三个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值。所述第七差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第八差值为所述第三部分中的第二个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;或者,所述第七差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第八差值为所述第三部分中的第三个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值。
可选地,当所述第三信号中携带的所述第一子信号的参考比特用第二相关值表征,所述M等于3时,可以借位而结合目标部分来确定参考比特相关值。若所述参考比特为第一
值,则所述第二相关值为第九差值与第十差值的相关值,或者,若所述参考比特为第二值,则所述第二相关值为第十一差值与第十二差值的相关值。其中,所述第九差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十差值为所述第三部分中的第三个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第九差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十差值为所述目标第二时间单元中的数据减去所述第三部分中的第三个第一时间单元中的数据得到的差值。所述第十一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十二差值为所述第三部分中的第三个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第十一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十二差值为所述目标第二时间单元中的数据减去所述第三部分中的第三个第一时间单元中的数据得到的差值。
可选地,当所述第三信号中携带的所述第一子信号的参考比特用第一相关值表征,所述M等于4时,可以单独用第三部分来确定参考比特相关值。若所述参考比特为第一值,则所述第一相关值为第十三差值与第十四差值的相关值,或者,若所述参考比特为第二值,则所述第一相关值为第十五差值与第十六差值的相关值。其中,所述第十三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十四差值为所述第三部分中的第三个第一时间单元中的数据减去第四个第一时间单元中的数据得到的差值;或者,所述第十三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十四差值为所述第三部分中的第四个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值。所述第十五差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十六差值为所述第三部分中的第三个第一时间单元中的数据减去第四个第一时间单元中的数据得到的差值;或者,所述第十五差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十六差值为所述第三部分中的第四个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值。
可选地,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二值等于1。这样借助0和1的设置,可以简化调制信号的解调过程。
可理解的,上述对M等于2、3或4时的参考比特的表征方式,仅是举例说明,并不对本申请进行限制,在M等于其他值的情况下,可以基于调制需求采用其他的参考比特的表征方式。
可选地,当所述E等于4时,若所述信息比特等于第三值,则所述第三相关值为第十七差值与第十八差值的相关值,或者,若所述信息比特等于第四值,则所述第三相关值为
第十九差值与第二十差值的相关值。其中,所述第十七差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第十八差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第十七差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值,所述第十八差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值。所述第十九差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值,所述第二十差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第十九差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第二十差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值。
可选地,所述第三值等于1,所述第四值等于0;或者,所述第三值等于0,所述第四值等于1。这样借助0和1的设置,可以简化调制信号的解调过程。
需指出的,对于不同差值的相关值,可以对此不同差值进行相关计算得到。所述相关计算可以包括但不限于相乘、求和等。比如:第一差值与第二差值的相关值可以等于,第一差值与第二差值的乘积;第五差值与第六差值的相关值可以等于,第五差值与第六差值的乘积;第九差值与第十差值的相关值可以等于,第九差值与第十差值的乘积;等等。不同差值的相关值可以表征此不同差值的相似程度或极性变化相似程度。
下面以第一时间单元和第二时间单元都为时隙(slot)为例,对调制特征2下的调制过程进行说明。
实例3
本实例3中,以M=2,E=4为例,第一信号的每个第一基本单元中,第一部分包含2个slot,第二部分包含4个slot;假设基信号b(t)包含第一子信号bR(mN+n)和第二子信号bD(mN+n),当0≤m<M时对应第一子信号,当M≤m<M+E时对应第二子信号,mod表示取余数符号,则第一子信号与第一部分对应,用于调制第一部分得到第三信号中相应的第三部分;第二子信号与第二部分对应,用于调制第二部分得到第三信号中相应的第四部分。基信号b(t)可以满足如下任一情况:
情况一:用于调制第一部分的第一子信号bR(mN+n)为:
此时如图7A和图7B所示,经过调制后,用第三部分的slot2中数据减去slot1中数据的差值(即第三部分的第2个slot到第1个slot的极性变化),与第三部分的slot2中数据减去第四部分的slot1中数据的差值(即第三部分的第2个slot到第四部分的第1个slot的极性变化)的乘积,表征参考比特B=1;而用第四部分的slot1中数据减去第三部分的slot2中数据的差值(即第四部分的第1个slot到第三部分的第2个slot的极性变化),与第三部
分的slot2中数据减去slot1中数据的差值(即第三部分的第2个slot到第1个slot的极性变化)的乘积,表征参考比特B=0。
此情况一下,基信号b(t)满足如下波形性质:第三部分的最后1个slot(即slot 2)的电平与第四部分的第1个slot(即slot1)的电平是相反的。
(I)若用第四部分的slot4中数据减去slot3中数据的差值(即第4个slot到第3个slot的极性变化),与第四部分的slot2中数据减去slot1中数据的差值(即第2个slot到第1个slot的极性变化)的乘积,表征对应的信息比特,则:
如果第一设备发送信息比特B=1,即基信号的比特信息为1,则如图7A所示,第四部分对应的第二子信号波形为:
而如果第一设备发送信息比特B=0,即基信号的比特信息为0,则如图7A所示,第四部分对应的第二子信号波形为:
(II)若用第四部分的slot3中数据减去slot4中数据的差值(即第3个slot到第4个slot的极性变化),与第四部分的slot2中数据减去slot1中数据的差值(即第2个slot到第1个slot的极性变化)的乘积,表征对应的信息比特,则:
如果第一设备发送信息比特B=0,即基信号的比特信息为0,则如图7B所示,第四部分对应的第二子信号波形为:
而如果第一设备发送信息比特B=1,即基信号的比特信息为1,则如图7B所示,第四部分对应的第二子信号波形为:
情况二:用于调制第一部分的第一子信号bR(mN+n)为:
此时如图7C和图7D所示,经过调制后,用第三部分的slot2中数据减去slot1中数据的差值(即第三部分的第2个slot到第1个slot的极性变化),与第三部分的slot2中数据减去第四部分的slot1中数据的差值(即第三部分的第2个slot到第四部分的第1个slot的极性变化)的乘积,表征参考比特B=1;而用第四部分的slot1中数据减去第三部分的slot2中数据的差值(即第四部分的第1个slot到第三部分的第2个slot的极性变化),与第三部分的slot2中数据减去slot1中数据的差值的乘积,表征参考比特B=0。
此情况二下,基信号b(t)满足如下波形性质:第三部分的最后1个slot(即slot 2)的电平与第四部分的第1个slot(即slot1)的电平是相反的。
(I)若用第四部分的slot4中数据减去slot3中数据的差值(即第4个slot到第3个slot的极性变化),与第四部分的slot2中数据减去slot1中数据的差值(即第2个slot到第1个slot的极性变化)的乘积,表征对应的信息比特,则:
如果第一设备发送信息比特B=1,即基信号的比特信息为1,则如图7C所示,第四部分对应的第二子信号波形为:
而如果第一设备发送信息比特B=0,即基信号的比特信息为0,则如图7C所示,第四部分对应的第二子信号波形为:
(II)若用第四部分的slot3中数据减去slot4中数据的差值(即第3个slot到第4个slot的极性变化),与第四部分的slot2中数据减去slot1中数据的差值的乘积(即第2个slot到第1个slot的极性变化),表征对应的信息比特,则:
如果第一设备发送信息比特B=0,即基信号的比特信息为0,则如图7D所示,第四部分对应的第二子信号波形为:
而如果第一设备发送信息比特B=1,即基信号的比特信息为1,则如图7D所示,第四部分对应的第二子信号波形为:
请参见图8,图8是本申请实施例提供的一种信息接收方法的流程图,该方法由第三设备执行,该第三设备为BSC接收设备,包括但不限于读写器Reader等。如图8所示,该方法包括如下步骤:
步骤81:第三设备接收第一设备发送的第三信号。
本实施例中,所述第三信号是利用第二信号对第一信号进行反向散射调制得到的,所述第二信号是根据第二设备的个数和基信号构建得到,具体构建方式可以参见上述实施例。所述第二设备的个数大于2。所述第二设备是提供第一信号的设备,比如为单基地结构下的Reader等射频源。所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号。
在一些实施例中,所述时间单元可以包括但不限于以下任一项:符号(symbol)、时隙(slot)、子帧(subframe)、帧(frame)等。
需指出的,所述第一信号的具体形式以及相应调制方式可以参见上述实施例中所示,在此不再赘述。
在一些实施例中,所述第二信号可以称为基带信号或调制信号x(n)。
步骤82:第三设备根据第二设备的个数和所述第三信号,构建第四信号,所述第四信号中携带有所述基信号的比特信息。
这里,所述第三设备可选为多个第二设备中的任一设备,比如为第k个Reader。而第k个Reader知道所有Reader的个数/数目K,或者除自身之外其它Reader的数目K-1,K>2。K的取值可以是网络配置或指示的,也可以是第k个Reader通过检测序列等方式自己检测或估计得到的。所述第四信号包括第三部分和第四部分,所述第三部分占用M个第一时间单元,所述第四部分占用E个第二时间单元,所述M和E为大于或等于2的整数。所述第一时间单元对应的数据长度为N,所述第二时间单元对应的数据长度为N,所述N为大于第一阈值的正整数,所述N可以是随机的。
对于任意第k个Reader,可以接收BSC发送设备发送的信号以及其它Reader发送的信号,可记为yk[n]。可选地,可以对信号yk[n]进行同步、信道估计与均衡、或解资源映射等信号处理,获得后再构建第四信号。为了消除其它K-1个Reader的直接链路干扰,第k个Reader需要恢复出基信号b[n]。
步骤83:第三设备对第四信号进行解调制,获得所述基信号的比特信息。
这样,可以在多基地反向散射通信的场景下,一方面利用基信号的多层极性差来高效地消除多直接链路干扰,一方面利用基信号中相邻时间单元中的数据之间的极性变化情况或者差值的相关值来携带比特信息,使得BSC接收端只需要通过简单的极性判断或者相关值比较就可以完成多直接链路干扰消除和调制信号解调。
可选地,所述第四信号的构建过程可包含如下步骤:
S1:将k和i初始化为1;
S2:当满足k≤K-2时,执行如下过程,直至k>K-2,并执行
所述K为第二设备的个数,所述L为第二信号的长度:
根据yk,i-1[n]获得pi[n],并执行以及将k设置为k+1,和将i设置为i+1;其中,p1[n]为根据yk,0[n]获得,yk,0[n]为经过信道传输后的第三信号,即第三设备收到的信号,此时n=0,...,L。
上述构建过程中,在根据yk,i-1[n]获得pi[n]时,可以对yk,i-1[n]进行频率补偿或相位补偿等信号处理,也可以不经过处理直接获得pi[n]。在根据yk,0[n]获得p1[n]时,可以对yk,0[n]进行频率补偿或相位补偿等信号处理,也可以不经过处理直接获得p1[n]。
本申请实施例中,可以根据调制特征实现对第四信号的解调制。当所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号时,上述对第四信号进行解调制,获得所述基信号的比特信息的过程可以包括:
第三设备对所述第四信号的第三部分中的每两个相邻的第一时间单元中的数据进行相减,获得第一差值组,以及对所述第四信号的第四部分中的每两个相邻的第二时间单元中的数据进行相减,获得第二差值组;
第三设备根据所述第一差值组,确定所述第三部分中的每两个相邻的第一时间单元中的数据的差值的第四相关值,以及根据所述第二差值组,确定所述第四部分中的每两个相邻的第二时间单元中的数据的差值的第五相关值;
第三设备根据第四相关值和第五相关值,解调制得到所述基信号的比特信息。
这里,所述第四相关值可以表征第三部分中的每两个相邻的第一时间单元中的数据的差值的相似程度或极性变化相似程度,可以通过对第一差值组中的每两个相邻的第一时间单元中的数据的差值进行相关计算得到。所述第五相关值可以表征第四部分中的每两个相邻的第二时间单元中的数据的差值的相似程度或极性变化相似程度,可以通过对第二差值组中的每两个相邻的第一时间单元中的数据的差值进行相关计算得到。比如:第三设备可以对第一差值组中的每两个相邻的第一时间单元中的数据的差值进行相关计算,获得第四相关值,以及对第二差值组中的每两个相邻的第二时间单元中的数据的差值进行相关计算,获得第五相关值。所述相关计算包括但不限于相乘、求和等。
由于第三设备接收第一设备发送的第三信号时,同时会接收其他多个第二设备发送的第一信号,此时第一信号为直接链路干扰信号,第一信号的第一部分中的相邻时间单元中的数据是完全相同的,第一信号的第二部分中的相邻时间单元中的数据是完全相同的,且具有重复结构的信号经过信道之后其重复结构依然保持,因此,通过对第四信号的第三部分中的每两个相邻的第一时间单元中的数据进行相减,以及对第四信号的第四部分中的每两个相邻的第二时间单元中的数据进行相减,可以消除直接链路干扰信号。而对于调制后的第三信号(即反向散射信号),由于第四信号中携带的基信号的比特信息用第三部分的第一变化情况与第四部分的第二变化情况表征,因此通过确定第三部分中相应差值的第一相关值和第四部分中相应差值的第二相关值,结合调制规则即可基于确定的相关值来进行解
调制。由此在进行解调制时无需构建具体的判决阈值,不受限于有效重复结构长度以及接收信噪比(Signal to Noise ratio,SNR)等信道环境的影响,因此可以大大的降低解调复杂度,提高了反向散射通信的系统性能。
可选地,当所述M和E等于4时,所述第一差值组包括:所述第三部分中的第二个第一时间单元中的数据与第一个第一时间单元中的数据的差值,和所述第三部分中的第四个第一时间单元中的数据与第三个第一时间单元中的数据的差值;或者,所述第一差值组包括:所述第三部分中的第一个第一时间单元中的数据与第二个第一时间单元中的数据的差值,和所述第三部分中的第三个第一时间单元中的数据与第四个第一时间单元中的数据的差值。所述第二差值组包括:所述第四部分中的第二个第二时间单元中的数据与第一个第二时间单元中的数据的差值,和所述第四部分中的第四个第二时间单元中的数据与第三个第二时间单元中的数据的差值;或者,所述第二差值组包括:所述第四部分中的第一个第二时间单元中的数据与第二个第二时间单元中的数据的差值,和所述第四部分中的第三个第一时间单元中的数据与第四个第一时间单元中的数据的差值。
可选地,当所述M和E等于3时,所述第一差值组包括:所述第三部分中的第二个第一时间单元中的数据与第一个第一时间单元中的数据的差值,和所述第三部分中的第三个第一时间单元中的数据与第二个第一时间单元中的数据的差值;或者,所述第一差值组包括:所述第三部分中的第一个第一时间单元中的数据与第二个第一时间单元中的数据的差值,和所述第三部分中的第二个第一时间单元中的数据与第三个第一时间单元中的数据的差值。所述第二差值组包括:所述第四部分中的第二个第二时间单元中的数据与第一个第二时间单元中的数据的差值,和所述第四部分中的第三个第二时间单元中的数据与第二个第二时间单元中的数据的差值,或者,所述第二差值组包括:所述第四部分中的第一个第二时间单元中的数据与第二个第二时间单元中的数据的差值,和所述第四部分中的第二个第二时间单元中的数据与第三个第二时间单元中的数据的差值。
本申请实施例中,为了进行噪声平滑,第一设备可以发送P个第三信号,并对应构建P个第四信号,所述P为大于或等于2的整数。此情况下,在获得第一差值组和第二差值组之后,可以对P个第四信号对应的P个第一差值组包括的差值进行对位平均(此对位平均可理解为对P个第三部分的对应差值进行平均),获得第一平均差值组,以及对P个第四信号对应的P个第二差值组包括的差值进行对位平均(此对位平均可理解为对P个第四部分的对应差值进行平均),获得第二平均差值组;然后,根据所述第一平均差值组,确定所述第三部分中的每两个相邻的第一时间单元中的数据的差值的第四相关值,以及根据所述第二平均差值组,确定所述第四部分中的每两个相邻的第二时间单元中的数据的差值的第五相关值。
可选地,在获得第一平均差值组和第二平均差值组后,第三设备可以对所述第一平均差值组中包含的平均差值进行相关计算,获得第四相关值,以及对所述第二平均差值组中包含的平均差值进行相关计算,获得第五相关值。其中,所述相关计算包括但不限于相乘、
求和等。
可理解的,由于第四信号中携带的基信号的比特信息用第三部分的第一变化情况与第四部分的第二变化情况表征,所述第一变化情况与所述第二变化情况不相同,所述第一变化情况为第三部分中的每两个相邻的第一时间单元中的数据的极性变化之间的同异情况,所述第二变化情况为第四部分中的每两个相邻的第二时间单元中的数据的极性变化之间的同异情况,因此,所述第三部分中的每两个相邻的第一时间单元中的数据的极性变化的相似程度与所述第四部分中的每两个相邻的第二时间单元中的数据的极性变化的相似程度不相同,因此基于所述第三部分的第四相关值和所述第四部分的第五相关值的相对大小比较,可以解调制出基信号的比特信息。
可选地,上述根据第四相关值和第五相关值,解调制得到所述基信号的比特信息可以包括:第三设备根据预设的调制规则,当所述第四相关值大于或等于所述第五相关值时,确定所述基信号的比特信息为第一值,或者,当所述第四相关值小于所述第五相关值时,确定所述基信号的比特信息为第二值。
可选地,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二值等于1。这样借助0和1的设置,可以简化调制信号的解调过程。
下面以第一时间单元和第二时间单元都为时隙(slot),M和E等于4或3为例,对本申请实施例中的解调制过程进行说明。
实例一
本实例一与上述说明调制过程时的实例1对应,第一信号的每个第一基本单元中,第一部分包含4个slot,第二部分包含4个slot,即M和E等于4,每个第一基本单元的长度为8个slot。第三设备在同步之后,获得第四信号y(t)。之后,以每8个slot为一个基本时隙块单位,前4个slot为调制了基信号的第三部分,后4个slot为调制了基信号的第四部分,分别对所述第三部分和所述第四部分中相邻的偶数和奇数2个slot相减,获得第一差值组和第二差值组。
比如,可以利用第三部分中的第2个slot减去第1个slot,和利用第三部分中的第4个slot减去第3个slot,得到第一差值组;以及,利用第四部分中的第2个slot减去第1个slot,和利用第四部分中的第4个slot减去第3个slot,得到第二差值组。
比如,第三部分/第四部分中计算得到的差值可表示如下:
其中,τ2≤n≤N+τ1-1,τ1和τ2分别是直接链路和反向散射级联链路的多径时延且有τ2>τ1,mod(m,4)=even,0≤m<M。z(mN+n)表示第m+1个slot和第m个slot中的第n个数据符号的差值。从上述表达式可以得到:由于相邻两个slot的数据s(t)是完全相同的,因此直接链路干扰项被消除了;但也使得接收信号的噪声项的功率抬升,噪声功率变成以前的两倍。
可选地,如果射频源发送P个重复的第一信号,那么可以利用这P个重复的第一信号进
行噪声平滑,即对计算得到的第一差值组中包含的差值进行对位平均,获得第一平均差值组,和对计算得到的第二差值组中包含的差值进行对位平均,获得第二平均差值组,如下:
若P个重复的第一信号为集中式,则:
若P个重复的第一信号为分布式,则:
其中,Q是分布式结构中一个数据时隙(Data slots)的长度,所述Data slots是射频源的用于其它功能的时隙块。
可选地,在获得第一平均差值组和第二平均差值组之后,可以计算第三部分内的两个由相邻偶数和奇数两个slot获得的差值的平均值的相关值CR,以及计算第四部分内的两个由相邻偶数和奇数两个slot获得的差值的平均值的相关值CD,如下:
进一步的,结合调制和解调制规则,可以根据CR与CD的相对大小比较,解调制BSC基带信号(即基信号)的比特信息B,比如为:
上述实例1中,由于B=1时,第三部分中相邻slot对应的极性变化相同,第四部分中相邻slot对应的极性变化相反,因此,第三部分内相邻slot间的极性变化相似程度大于第四部分内相邻slot间的极性变化相似程度,即第三部分对应的相关值CR大于第四部分对应的相关值CD,因此在进行解调制时,若CR≥CD,则可确定基信号的信息比特B=1。而由于B=0时,第三部分中相邻slot对应的极性变化相反,第四部分中相邻slot对应的极性变化相同,因此,第三部分内相邻slot间的极性变化相似程度小于第四部分内相邻slot间的极性变化相似程度,即第三部分对应的相关值CR小于第四部分对应的相关值CD,因此在进行解调制时,若CR<CD,则可确定基信号的信息比特B=0。
实例二
本实例二与上述说明调制过程时的实例2对应,第一信号的每个第一基本单元中,第一部分包含3个slot,第二部分包含3个slot,即M和E等于3,每个第一基本单元的长度为6个slot。第三设备在同步之后,获得第四信号y(t)。之后,以每6个slot为一个基本时隙块单位,前3个slot为调制了基信号的第三部分,后3个slot为调制了基信号的第四部分,分别对第三部分和第四部分中相邻的2个slot相减,获得第一差值组和第二差值组。
比如,可以利用第三部分中的第2个slot减去第1个slot,和利用第三部分中的第3个slot减去第2个slot,得到第一差值组;以及,利用第四部分中的第2个slot减去第1个slot,
和利用第四部分中的第3个slot减去第2个slot,得到第二差值组。
比如,第四信号中计算得到的差值可表示如下:
其中,τ2≤n≤N+τ1-1,mod(m,3)=odd,0≤m<M。z(mN+n)表示第m+1个slot和第m个slot中第n个数据符号的差值。从上述表达式可以得到:由于相邻两个slot的数据s(t)是完全相同的,因此直接链路干扰项被消除了;但也使得接收信号的噪声项的功率抬升,噪声功率变成以前的两倍。
可选地,如果射频源发送P个重复的第一信号,那么利用这P个重复的第一信号进行噪声平滑,即对计算得到的第一差值组中包含的差值进行对位平均,获得第一平均差值组,和对计算得到的第二差值组中包含的差值进行对位平均,获得第二平均差值组,如下:
若P个重复的第一信号为集中式,则:
若P个重复的第一信号为分布式,则:
其中,Q是分布式结构中一个数据时隙(Data slots)的长度,所述Data slots是射频源的用于其它功能的时隙块。
可选地,在获得第一平均差值组和第二平均差值组之后,可以计算第三部分内的两个由两个前后相邻slot获得的差值的平均值的相关值CR,以及计算第四部分内的两个由两个前后相邻slot获得的差值的平均值的相关值CD,如下:
其中,τ1和τ2分别是直接链路和反向散射级联链路的多径时延且有τ2>τ1。
进一步的,结合调制规则,可以根据CR与CD的相对大小比较,解调制BSC基带信号(即基信号)的比特信息B,比如为:
上述实例2中,由于B=1时,第三部分中相邻slot对应的极性变化相同,第四部分中相邻slot对应的极性变化相反,因此,第三部分内相邻slot间的极性变化相似程度大于第四部分内相邻slot间的极性变化相似程度,即第三部分对应的相关值CR大于第四部分对应的相关值CD,因此在进行解调制时,若CR≥CD,则可确定基信号的信息比特B=1。而由于B=0时,第三部分中相邻slot对应的极性变化相反,第四部分中相邻slot对应的极性变化相同,因此,第三部分内相邻slot间的极性变化相似程度小于第四部分内相邻slot间极性变化
的相似程度,即第三部分对应的相关值CR小于第四部分对应的相关值CD,因此在进行解调制时,若CR<CD,则可确定基信号的信息比特B=0。
可选地,当所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号时,上述对第四信号进行解调制,获得所述基信号的比特信息的过程可以包括:
第三设备构建所述第四信号中携带的参考比特为第一值时的第六相关值,以及构建所述第四信号中携带的参考比特为第二值时的第七相关值,以及构建所述第四部分中的相邻第二时间单元中的数据之间的差值的第八相关值;所述参考比特与所述基信号中的第一子信号对应,所述第六相关值为与所述第三部分中的相邻第一时间单元中的数据之间的差值相关的值,所述第七相关值为与所述第三部分中的相邻第一时间单元中的数据之间的差值相关的值;
第三设备根据所述第六相关值、所述第七相关值和所述第八相关值,解调制得到所述基信号中的第二子信号的信息比特。
一些实施例中,第三设备可以根据预定义、预配置等的调制与解调制规则,即生成第三信号时所使用的调制规则,构建参考比特为第一值时的第六相关值,构建第三信号中携带的参考比特为第二值时的第七相关值,以及构建第四部分中的相邻第二时间单元中的数据之间的差值的第八相关值。
可选地,第三设备可以根据预先建立的参考比特与信息比特之间的关系,针对第四部分,当第八相关值与第六相关值的乘积大于或等于第八相关值与第七相关值的乘积时,确定相应第二子信号的信息比特为第三值,或者,当第八相关值与第六相关值的乘积小于第八相关值与第七相关值的乘积时,确定相应第二子信号的信息比特为第四值。
可选地,所述第三值等于1,所述第四值等于0;或者,所述第三值等于0,所述第四值等于1。这样借助0和1的设置,可以简化调制信号的解调过程。
由于第三设备接收第二设备发送的第三信号时,同时会接收其他多个第二设备发送的第一信号,此时第一信号为直接链路干扰信号,第一信号的第一部分中的相邻时间单元中的数据是完全相同的,第一信号的第二部分中的相邻时间单元中的数据是完全相同的,且具有重复结构的信号经过信道之后其重复结构依然保持,因此,通过构建相邻第一/第二时间单元中的数据之间的差值的相关值,可以对相邻第一/第二时间单元中的数据进行相减,从而消除直接链路干扰信号。而对于调制后的第四信号(即反向散射信号),借助相关值的构建,结合调制规则即预先建立的参考比特与信息比特之间的关系,即可基于构建的相关值来进行解调制。由此在进行解调制时无需构建具体的判决阈值,不受限于有效重复结构长度以及接收SNR等信道环境的影响,因此可以大大的降低解调复杂度,改善解调性能,提高了双基地反向散射通信的系统性能。
可选地,当所述M等于2时,需结合第四部分来确定参考比特相关值,所述第六相关值为第二十一差值与第二十二差值的相关值,所述第七相关值为第二十三差值与第二十四差值的相关值。所述第二十一差值为所述第三部分中的第二个第一时间单元中的数据减去
第一个第一时间单元中的数据得到的差值,所述第二十二差值为所述第三部分中的第二个第一时间单元中的数据减去目标第二时间单元中的数据得到的差值;或者,所述第二十一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二十二差值为目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值。所述第二十三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二十四差值为所述第三部分中的第二个第一时间单元中的数据减去目标第二时间单元中的数据得到的差值;或者,所述第二十三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二十四差值为目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值。所述目标第二时间单元为所述第四部分中的任一第二时间单元,优先为第一个第二时间单元。
可选地,当所述E等于4时,所述第八相关值为第二十五差值与第二十六差值的相关值,或者,所述第八相关值为第二十七差值与第二十八差值的相关值。所述第二十五差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述二十六差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第二十五差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值,所述第二十六差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值。所述第二十七差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值,所述第二十八差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第二十七差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第二十八差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值。
需指出的,对于不同差值的相关值,可以对此不同差值进行相关计算得到。所述相关计算可以包括但不限于相乘、求和等。上述仅以M等于2,E等于4为例,但按照相同的构建方式,可以扩展到M=3,E=4以及M=4,E=4等情况,对此不再赘述。
本申请实施例中,为了进行噪声平滑,第二设备可以发送Z个第三信号,并对应构建Z个第四信号,所述Z为大于或等于2的整数。此情况下,所述第六相关值为根据第三平均差值组确定的相关值,所述第三平均差值为对Z个第四信号中的第三差值组包括的差值进行对位平均获得;所述第三差值组包括第二十九差值,或者,所述第三差值组包括第二十九差值和第三十差值,所述第二十九差值包括所述参考比特为第一值时的所述第四信号的第三部分中的相邻第一时间单元中的数据之间的差值,所述三十差值包括所述第四信号的第三部分中的第M个第一时间单元中的数据与目标第二时间单元中的数据的差值,所述目标第二时间单元为所述第四信号的第四部分中的任一第二时间单元。所述第七相关值为根
据第四平均差值组确定的相关值,所述第四平均差值为对Z个第四信号中的第四差值组包括的差值进行对位平均获得;所述第四差值组包括第三十一差值,或者,所述第四差值组包括第三十一差值和第三十二差值,所述第三十一差值包括所述参考比特为第二值时的所述第四信号的第三部分中的相邻第一时间单元中的数据之间的差值,所述第三十二差值包括所述第四信号的第三部分中的第M个第一时间单元中的数据与目标第二时间单元中的数据的差值,所述目标第二时间单元为所述第四信号的第四部分中的任一第二时间单元,优先为第一个第二时间单元。所述第八相关值为根据第五平均差值组确定的相关值,第五平均差值组为对Z个第四信号中的第五差值组包括的差值进行对位平均获得,所述第五差值组包括所述第四信号的第四部分中的相邻第二时间单元中的数据之间的差值。
下面以第一时间单元和第二时间单元都为时隙(slot)为例,对本申请实施例中的解调制过程进行说明。
实施例三
本实例三与上述说明调制过程时的实例3对应,以M=2,E=4为例,先根据M=2个时隙的第三部分,并根据M=2,E=4的信号调制规则构建出表征参考比特B=1和B=0的相邻slot中数据的差值的相关值,分别记为
(I)信号调制中,用第三部分的slot2中数据减去slot1中数据的差值,与第三部分的slot2中数据减去第四部分的slot1中数据的差值的乘积,表征参考比特B=1。因此,对于一个基本信号中,以最开始的2个slot与第四部分中的第一个slot为广义第三部分,并将用第三部分的第2个slot中数据减去第1个slot中数据,以及用第三部分的第2个slot中数据减去第四部分的第1个slot中数据,分别得到差值:
其中,τ2≤n≤N+τ1-1,mod(m,2)=0,0≤m<M。z(mN+n)表示相应两个slot的位置n处数据的差值。从上述表达式可以得到:由于相邻两个slot的数据s(t)是完全相同的,因此直接链路干扰项被消除了;但也使得接收信号的噪声项的功率抬升,噪声功率变成以前的两倍。
(II)构建表征参考比特B=1的差值的相关值,有:
(III)信号调制中,用第四部分的slot1中数据减去第三部分的slot2中数据的差值,与第三部分的slot2中数据减去slot1中数据的差值的乘积,表征参考比特B=0。因此,对于一个基本信号中,以最开始的2个slot与第四部分中的第一个slot为广义第三部分,并将用第三部分的第2个slot减去第1个slot,以及用第四部分的第1个slot减去第三部分的第2个slot,分别得到差值:
其中,τ2≤n≤N+τ1-1,mod(m,2)=0,0≤m<M。z(mN+n)表示相应两个slot的位置n处数据的差值。从上述表达式可以得到:由于相邻两个slot的数据s(t)是完全相同的,因此直接链路干扰项被消除了;但也使得接收信号的噪声项的功率抬升,噪声功率变成以前的两倍。
(IV)构建表征参考比特B=0的差值的相关值,有:
其次,解调第四部分对应的信息比特。针对第四部分,以E个slot为一个基本单元解调出对应的信息比特:
(I)按照预设的编码规则构建出第四部分的相邻slot中数据的差值的相关值,分别记为Cinf;
(a1)如果信号调制是用第四部分的第4个slot中数据到第3个slot中数据的差值,与第2个slot中数据到第1个slot中数据的差值的乘积,表示信息比特。因此,对于一个时隙E=4的第四部分,即用第2个slot中数据减去第1个slot中数据,得到差值,以及用第4个slot中数据减去第3个slot中数据,得到差值:
其中,τ2≤n≤N+τ1-1,mod(m,4)=even,M≤m<M+P。
(b1)可选地,如果射频源发送K(K为正整数)个重复的基本时隙块(即第一信号),那么可以利用这K个重复的基本时隙块进行噪声平滑,可得:
集中式:
分布式:
其中,L是分布式结构中一个数据部分(如Data slots)的长度,所述Data slots是射频源的用于其它功能的时隙块。
(c1)分别求解第四部分内的两个slot获得的差值z(mN+n)或差值的平均值的相关值,可得:
(a2)如果信号调制是用第四部分中的第3个slot中数据到第4个slot中数据的差值,与第2个slot中数据到第1个slot中数据的差值的乘积,表示信息比特。因此,对于一个时隙E=4的第四部分,即用第2个slot中数据减去第1个slot中数据,得到差值,以及用第3个slot中数据减去第4个slot中数据,得到差值:
其中,τ2≤n≤N+τ1-1,mod(m,4)=0,M≤m<M+E。
其中,τ2≤n≤N+τ1-1,mod(m,4)=2,M≤m<M+E。
(b2)可选地,如果射频源发送K(K为正整数)个重复的基本时隙块,那么可以利用这K个重复的基本时隙块进行噪声平滑,可得:
集中式:
分布式:
其中,L是分布式结构中一个Data slots的长度,所述Data slots是射频源的用于其它功能的时隙块。
(c2)分别求解同一个第四部分内的两个slot获得的差值z(mN+n)或差值的平均值的相关值,可得:
(II)利用构建出的第四部分中差值的相关值Cinf与第三部分中构建出的表征参考比特B=1和B=0的两个差值的相关值进行相关处理。
(III)按照如下规则对信息比特B进行判决:
需指出的,按照相同的思想,可以扩展到M=3,E=4以及M=4,E=4的情况,在此不再赘述。
请参见图9,图9是本申请实施例提供的一种信息发送装置的结构示意图,该装置应用于第一设备,该第一设备为BSC发送设备,包括但不限于标签Tag、无源或半无源的IoT设备等。如图9所示,信息发送装置90包括:
第一接收模块91,用于接收第一信号;
调制模块92,用于利用第二信号对所述第一信号进行反向散射调制,生成第三信号;其中,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;
所述第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;
发送模块93,用于发送所述第三信号。
可选地,所述第二信号的构建过程为:
将k初始化为K-2,所述K为所述第二设备的个数;
当满足k≥1时,执行如下过程,直至k<1,并执行x[n]=b[n],n=0,…,L-1,所述L为所述第二信号的长度:
执行b[n+L/2k]=-b[n],和将k设置为k-1;
其中,b[n]表示所述基信号,所述基信号的长度为L/2K-2。
可选地,所述第一信号包括2K-2个第一基本单元,每个所述第一基本单元的长度为L/2K-2,每个所述第一基本单元包括第一部分和第二部分,所述第一部分占用M个第一时间单元,所述M个第一时间单元中的数据相同,所述第二部分占用E个第二时间单元,所述E个第二时间单元中的数据相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同或者相反,所述M和E为大于或等于2的整数;所述第三信号包括2K-2个第二基本单元,每个所述第二基本单元的长度为L/2K-2,每个所述第二基本单元包括第三部分和第四部分;
所述基信号包括第一子信号和第二子信号,当利用第二信号对所述第一信号进行反向散射调制时,所述第一子信号用于调制所述第一部分得到相应的第三部分,所述第二子信号用于调制所述第二部分得到相应的第四部分;
所述基信号的调制特征满足以下任一项:
所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述第一变化情况与所述第二变化情况不相同,所述第一变化情况为所述第三部分中的每两个相邻的第一时间单元中的数据的极性变化之间的同异情况,所述第二变化情况为所述第四部分中的每两个相邻的第二时间单元中的数据的极性变化之间的同异情况;
所述第三信号中携带的所述第一子信号的参考比特用第一相关值或第二相关值表征,所述第一相关值为所述第三部分中的相邻第一时间单元中的数据之间的差值的相关值;所述第二相关值为第三时间单元中的相邻时间单元中的数据之间的差值的相关值,所述第三时间单元包括所述第三部分中的M个第一时间单元和目标第二时间单元,所述目标第二时间单元为所述第四部分中的任一第二时间单元;所述第三信号中携带的所述第二子信号的信息比特用第三相关值表征,所述第三相关值为所述第四部分中的相邻第二时间单元中的数据之间的差值的相关值。
可选地,所述第一时间单元和所述第二时间单元为相同类型的时间单元,包括以下任一项:符号、时隙、子帧、帧。
可选地,当所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述M和E等于4时,
若所述比特信息为第一值,则所述第一变化情况为第一极性变化与第二极性变化相同,所述第二变化情况为第三极性变化与第四极性变化相反;或者,若所述比特信息为第二值,则所述第一变化情况为第一极性变化与第二极性变化相反,所述第二变化情况为第三极性变化与第四极性变化相同;
其中,所述第一极性变化为所述第三部分中的第一个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化,所述第二极性变化为所述第三部分中的第三个第一时间单元中的数据到第四个第一时间单元中的数据的极性变化;或者,所述第一极性变化为所述第三部分中的第二个第一时间单元中的数据到第一个第一时间单元中的数据的极性变化,所述第二极性变化为所述第三部分中的第四个第一时间单元中的数据到第三个第一时间单元中的数据的极性变化;
所述第三极性变化为所述第四部分中的第一个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化,所述第四极性变化为所述第四部分中的第三个第二时间单元中的数据到第四个第二时间单元中的数据的极性变化;或者,所述第三极性变化为所述第四部分中的第二个第二时间单元中的数据到第一个第二时间单元中的数据的极性变化,所述第四极性变化为所述第四部分中的第四个第二时间单元中的数据到第三个第二时间单元中的数据的极性变化。
可选地,当所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述M和E等于3时,若所述比特信息为第一值,则第一变化情况为第五极性变化与第六极性变化相同,第二变化情况为第七极性变化与第八极性变化相反;或者,若所述比特信息为第二值,则第一变化情况为第五极性变化与第六极性变化相反,第二变化情况为第七极性变化与第八极性变化相同;
其中,所述第五极性变化为所述第三部分中的第一个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化,所述第六极性变化为所述第三部分中的第二个第一时间单元中的数据到第三个第一时间单元中的数据的极性变化;或者,所述第五极性变化为所述第三部分中的第二个第一时间单元中的数据到第一个第一时间单元中的数据的极性变化,所述第六极性变化为所述第三部分中的第三个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化;
所述第七极性变化为所述第四部分中的第一个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化,所述第八极性变化为所述第四部分中的第二个第二时间单元中的数据到第三个第二时间单元中的数据的极性变化;或者,所述第七极性变化为所述第四部分中的第二个第二时间单元中的数据到第一个第二时间单元中的数据的极性变化,所述第八极性变化为所述第四部分中的第三个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化。
可选地,当所述第三信号中携带的所述第一子信号的参考比特用第二相关值表征,所述M等于2时,若所述参考比特为第一值,则第二相关值为第一差值与第二差值的相关值;或者,若所述参考比特为第二值,则第二相关值为第三差值与第四差值的相关值;
其中,所述第一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二差值为所述第三部分中的第二个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二差值为所述目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值;
所述第三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第四差值为所述第三部分中的第二个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第四差值为所述目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值。
可选地,当所述第三信号中携带的所述第一子信号的参考比特用第一相关值表征,所述M等于3时,若所述参考比特为第一值,则第一相关值为第五差值与第六差值的相关值,或者,若所述参考比特为第二值,则第一相关值为第七差值与第八差值的相关值;
其中,所述第五差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第六差值为所述第三部分中的第二个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;或者,所述第五差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第六差值为所述第三部分中的第三个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值;
所述第七差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第八差值为所述第三部分中的第二个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;或者,所述第七差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第八差值为所述第三部分中的第三个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值。
可选地,当所述第三信号中携带的第一子信号的参考比特用第二相关值表征,所述M等于3时,若所述参考比特为第一值,则第二相关值为第九差值与第十差值的相关值,或者,若所述参考比特为第二值,则第二相关值为第十一差值与第十二差值的相关值;
其中,所述第九差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十差值为所述第三部分中的第三个第一时间单元
中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第九差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十差值为所述目标第二时间单元中的数据减去所述第三部分中的第三个第一时间单元中的数据得到的差值;
所述第十一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十二差值为所述第三部分中的第三个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第十一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十二差值为所述目标第二时间单元中的数据减去所述第三部分中的第三个第一时间单元中的数据得到的差值。
可选地,当所述第三信号中携带的第一子信号的参考比特用第一相关值表征,所述M等于4时,若所述参考比特为第一值,则第一相关值为第十三差值与第十四差值的相关值,或者,若所述参考比特为第二值,则第一相关值为第十五差值与第十六差值的相关值;
其中,所述第十三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十四差值为所述第三部分中的第三个第一时间单元中的数据减去第四个第一时间单元中的数据得到的差值;或者,所述第十三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十四差值为所述第三部分中的第四个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;
所述第十五差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十六差值为所述第三部分中的第三个第一时间单元中的数据减去第四个第一时间单元中的数据得到的差值;或者,所述第十五差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十六差值为所述第三部分中的第四个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值。
可选地,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二值等于1。
可选地,当所述E等于4时,若所述信息比特等于第三值,则所述第三相关值为第十七差值与第十八差值的相关值,或者,若所述信息比特等于第四值,则所述第三相关值为第十九差值与第二十差值的相关值;
其中,所述第十七差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第十八差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第十七差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值,所述第十八差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时
间单元中的数据得到的差值;
所述第十九差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值,所述第二十差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第十九差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第二十差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值。
可选地,所述第三值等于1,所述第四值等于0;或者,所述第三值等于0,所述第四值等于1。
本申请实施例提供的信息发送装置90能够实现图2所示的方法实施例实现的各个过程,并达到相同的技术效果,为避免重复,这里不再赘述。
请参见图10,图10是本申请实施例提供的一种信息接收装置的结构示意图,该装置应用于第三设备,该第三设备为BSC接收设备,包括但不限于读写器Reader等。如图10所示,信息接收装置100包括:
第二接收模块101,用于接收第一设备发送的第三信号;其中,所述第三信号是利用第二信号对第一信号进行反向散射调制得到的,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;
构建模块102,用于根据所述第二设备的个数和所述第三信号,构建第四信号,所述第四信号中携带有所述基信号的比特信息;
解调制模块103,用于对所述第四信号进行解调制,获得所述基信号的比特信息。
可选地,所述第四信号的构建过程为:
将k和i初始化为1;
当满足k≤K-2时,执行如下过程,直至k>K-2,并执行
所述K为所述第二设备的个数,所述L为所述第二信号的长度:
根据yk,i-1[n]获得pi[n],并执行以及将k设置为k+1,和将i设置为i+1;其中,p1[n]为根据yk,0[n]获得,yk,0[n]为经过信道传输后的第三信号。
可选地,所述第四信号包括第三部分和第四部分,所述第三部分占用M个第一时间单元,所述第四部分占用E个第二时间单元,所述M和E为大于或等于2的整数;当所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号时,所述解调制模块103具体用于:
对所述第三部分中的每两个相邻的第一时间单元中的数据进行相减,获得第一差值组,
以及对所述第四部分中的每两个相邻的第二时间单元中的数据进行相减,获得第二差值组;根据所述第一差值组,确定所述第三部分中的每两个相邻的第一时间单元中的数据的差值的第四相关值,以及根据所述第二差值组,确定所述第四部分中的每两个相邻的第二时间单元中的数据的差值的第五相关值;根据所述第四相关值和所述第五相关值,解调制得到所述基信号的比特信息。
可选地,当所述M和E等于4时,所述第一差值组包括:所述第三部分中的第二个第一时间单元中的数据与第一个第一时间单元中的数据的差值,和所述第三部分中的第四个第一时间单元中的数据与第三个第一时间单元中的数据的差值;或者,所述第一差值组包括:所述第三部分中的第一个第一时间单元中的数据与第二个第一时间单元中的数据的差值,和所述第三部分中的第三个第一时间单元中的数据与第四个第一时间单元中的数据的差值;所述第二差值组包括:所述第四部分中的第二个第二时间单元中的数据与第一个第二时间单元中的数据的差值,和所述第四部分中的第四个第二时间单元中的数据与第三个第二时间单元中的数据的差值;或者,所述第二差值组包括:所述第四部分中的第一个第二时间单元中的数据与第二个第二时间单元中的数据的差值,和所述第四部分中的第三个第一时间单元中的数据与第四个第一时间单元中的数据的差值。
可选地,当所述M和E等于3时,所述第一差值组包括:所述第三部分中的第二个第一时间单元中的数据与第一个第一时间单元中的数据的差值,和所述第三部分中的第三个第一时间单元中的数据与第二个第一时间单元中的数据的差值;或者,所述第一差值组包括:所述第三部分中的第一个第一时间单元中的数据与第二个第一时间单元中的数据的差值,和所述第三部分中的第二个第一时间单元中的数据与第三个第一时间单元中的数据的差值;所述第二差值组包括:所述第四部分中的第二个第二时间单元中的数据与第一个第二时间单元中的数据的差值,和所述第四部分中的第三个第二时间单元中的数据与第二个第二时间单元中的数据的差值,或者,所述第二差值组包括:所述第四部分中的第一个第二时间单元中的数据与第二个第二时间单元中的数据的差值,和所述第四部分中的第二个第二时间单元中的数据与第三个第二时间单元中的数据的差值。
可选地,若所述第一设备发送P个第三信号,对应构建P个第四信号,所述P为大于或等于2的整数;所述解调制模块103还用于:
对所述P个第四信号对应的P个第一差值组包括的差值进行对位平均,获得第一平均差值组,以及对所述P个第四信号对应的P个第二差值组包括的差值进行对位平均,获得第二平均差值组;根据所述第一平均差值组,确定所述第四相关值,以及根据所述第二平均差值组,确定所述第五相关值。
可选地,所述解调制模块103还用于:根据预设的调制规则,当所述第四相关值大于或等于所述第五相关值时,确定所述基信号的比特信息为第一值,或者,当所述第四相关值小于所述第五相关值时,确定所述基信号的比特信息为第二值。
可选地,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二
值等于1。
可选地,所述第四信号包括第三部分和第四部分,所述第三部分占用M个第一时间单元,所述第四部分占用E个第二时间单元,所述M为大于或等于2的整数,所述E为大于或等于4的整数;当所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号时,所述解调制模块103具体用于:
构建所述第四信号中携带的参考比特为第一值时的第六相关值,以及构建所述第四信号中携带的参考比特为第二值时的第七相关值,以及构建所述第四部分中的相邻第二时间单元中的数据之间的差值的第八相关值;其中,所述参考比特与所述基信号中的第一子信号对应,所述第六相关值为与所述第三部分中的相邻第一时间单元中的数据之间的差值相关的值,所述第七相关值为与所述第三部分中的相邻第一时间单元中的数据之间的差值相关的值;根据所述第六相关值、所述第七相关值和所述第八相关值,解调制得到所述基信号中的第二子信号的信息比特。
可选地,当所述M等于2时,所述第六相关值为第二十一差值与第二十二差值的相关值,所述第七相关值为第二十三差值与第二十四差值的相关值;
其中,所述第二十一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二十二差值为所述第三部分中的第二个第一时间单元中的数据减去目标第二时间单元中的数据得到的差值;或者,所述第二十一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二十二差值为目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值;所述第二十三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二十四差值为所述第三部分中的第二个第一时间单元中的数据减去目标第二时间单元中的数据得到的差值;或者,所述第二十三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二十四差值为目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值;所述目标第二时间单元为所述第四部分中的任一第二时间单元。
可选地,当所述E等于4时,所述第八相关值为第二十五差值与第二十六差值的相关值,或者,所述第八相关值为第二十七差值与第二十八差值的相关值;
其中,所述第二十五差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述二十六差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第二十五差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值,所述第二十六差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值;所述第二十七差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值,所述第二十八差值为所述
第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第二十七差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第二十八差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值。
可选地,若所述第一设备发送Z个第三信号,对应构建Z个第四信号,所述Z为大于或等于2的整数;所述第六相关值为根据第三平均差值组确定的相关值,所述第三平均差值为对所述Z个第四信号中的第三差值组包括的差值进行对位平均获得;所述第三差值组包括第二十九差值,或者,所述第三差值组包括第二十九差值和第三十差值,所述第二十九差值包括所述参考比特为第一值时的所述第四信号的第三部分中的相邻第一时间单元中的数据之间的差值,所述三十差值包括所述第四信号的第三部分中的第M个第一时间单元中的数据与目标第二时间单元中的数据的差值,所述目标第二时间单元为所述第四信号的第四部分中的任一第二时间单元;
所述第七相关值为根据第四平均差值组确定的相关值,所述第四平均差值为对所述Z个第四信号中的第四差值组包括的差值进行对位平均获得;所述第四差值组包括第三十一差值,或者,所述第四差值组包括第三十一差值和第三十二差值,所述第三十一差值包括所述参考比特为第二值时的所述第四信号的第三部分中的相邻第一时间单元中的数据之间的差值,所述第三十二差值包括所述第四信号的第三部分中的第M个第一时间单元中的数据与目标第二时间单元中的数据的差值,所述目标第二时间单元为所述第四信号的第四部分中的任一第二时间单元;
所述第八相关值为根据第五平均差值组确定的相关值,第五平均差值组为对所述Z个第四信号中的第五差值组包括的差值进行对位平均获得,所述第五差值组包括所述第四信号的第四部分中的相邻第二时间单元中的数据之间的差值。
可选地,所述解调制模块103具体用于:根据预先建立的参考比特与信息比特之间的关系,针对所述第四部分,当所述第八相关值与所述第六相关值的乘积大于或等于所述第八相关值与所述第七相关值的乘积时,确定所述第二子信号的信息比特为第三值,或者,当所述第八相关值与所述第六相关值的乘积小于所述第八相关值与所述第七相关值的乘积时,确定所述第二子信号的信息比特为第四值。
可选地,所述第三值等于1,所述第四值等于0;或者,所述第三值等于0,所述第四值等于1。
本申请实施例提供的信息接收装置100能够实现图8所示的方法实施例实现的各个过程,并达到相同的技术效果,为避免重复,这里不再赘述。
如图11所示,本申请实施例还提供一种通信设备110,包括处理器111和存储器112,存储器112上存储有可在所述处理器111上运行的程序或指令,例如,该通信设备110为第一设备时,该程序或指令被处理器111执行时实现上述信息发送方法实施例的各个步骤,且能达到相同的技术效果。该通信设备110为第三设备时,该程序或指令被处理器111执行时
实现上述信息接收方法实施例的各个步骤,且能达到相同的技术效果,为避免重复,这里不再赘述。
本申请实施例还提供一种可读存储介质,所述可读存储介质上存储有程序或指令,该程序或指令被处理器执行时实现上述信息发送方法实施例的各个过程,或者实现上述信息接收方法实施例的各个过程,且能达到相同的技术效果,为避免重复,这里不再赘述。
其中,所述处理器为上述实施例中所述的终端中的处理器。所述可读存储介质,包括计算机可读存储介质,如计算机只读存储器(Read-Only Memory,ROM)、随机存取存储器(Random Access Memory,RAM)、磁碟或者光盘等。在一些示例中,可读存储介质可以是非瞬态的可读存储介质。
本申请实施例另提供了一种芯片,所述芯片包括处理器和通信接口,所述通信接口和所述处理器耦合,所述处理器用于运行程序或指令,实现上述信息发送方法实施例的各个过程,或者实现上述信息接收方法实施例的各个过程,且能达到相同的技术效果,为避免重复,这里不再赘述。
应理解,本申请实施例提到的芯片还可以称为系统级芯片,系统芯片,芯片系统或片上系统芯片等。
本申请实施例另提供了一种计算机程序/程序产品,所述计算机程序/程序产品被存储在存储介质中,所述计算机程序/程序产品被至少一个处理器执行以实现上述信息发送方法实施例的各个过程,或者实现上述信息接收方法实施例的各个过程,且能达到相同的技术效果,为避免重复,这里不再赘述。
本申请实施例还提供了一种无线通信系统,所述无线通信系统包括第一设备、第二设备、第三设备中的至少两个,所述第一设备用于实现如上述信息发送方法的步骤,所述第三设备用于实现如上述信息接收方法的步骤。
需要说明的是,在本文中,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外,需要指出的是,本申请实施方式中的方法和装置的范围不限按示出或讨论的顺序来执行功能,还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能,例如,可以按不同于所描述的次序来执行所描述的方法,并且还可以添加、省去或组合各种步骤。另外,参照某些示例所描述的特征可在其他示例中被组合。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解到上述实施例方法可借助计算机软件产品加必需的通用硬件平台的方式来实现,当然也可以通过硬件。该计算机软件产品存储在存储介质(如ROM、RAM、磁碟、光盘等)中,包括若干指令,用以使得终端或者网络侧设备执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述,但是本申请并不局限于上述的具体实施方式,上述的具体实施方式仅仅是示意性的,而不是限制性的,本领域的普通技术人员在本申请的启示下,在不脱离本申请宗旨和权利要求所保护的范围情况下,还可做出很多形式的实施方式,这些实施方式均属于本申请的保护之内。
Claims (31)
- 一种信息发送方法,包括:第一设备接收第一信号;所述第一设备利用第二信号对所述第一信号进行反向散射调制,生成第三信号;其中,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;所述第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;所述第一设备发送所述第三信号。
- 根据权利要求1所述的方法,其中,所述第二信号的构建过程为:将k初始化为K-2,所述K为所述第二设备的个数;当满足k≥1时,执行如下过程,直至k<1,并执行x[n]=b[n],n=0,…,L-1,所述L为所述第二信号的长度:执行和将k设置为k-1;其中,b[n]表示所述基信号,所述基信号的长度为L/2K-2。
- 根据权利要求2所述的方法,其中,所述第一信号包括2K-2个第一基本单元,每个所述第一基本单元的长度为L/2K-2,每个所述第一基本单元包括第一部分和第二部分,所述第一部分占用M个第一时间单元,所述M个第一时间单元中的数据相同,所述第二部分占用E个第二时间单元,所述E个第二时间单元中的数据相同,所述第一时间单元中的数据与所述第二时间单元中的数据相同或者相反,所述M和E为大于或等于2的整数;所述第三信号包括2K-2个第二基本单元,每个所述第二基本单元的长度为L/2K-2,每个所述第二基本单元包括第三部分和第四部分;所述基信号包括第一子信号和第二子信号,当利用第二信号对所述第一信号进行反向散射调制时,所述第一子信号用于调制所述第一部分得到相应的第三部分,所述第二子信号用于调制所述第二部分得到相应的第四部分;所述基信号的调制特征满足以下任一项:所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述第一变化情况与所述第二变化情况不相同,所述第一变化情况为所述第三部分中的每两个相邻的第一时间单元中的数据的极性变化之间的同异情况,所述第二变化情况为所述第四部分中的每两个相邻的第二时间单元中的数据的极性变化之间的同异情况;所述第三信号中携带的所述第一子信号的参考比特用第一相关值或第二相关值表征,所述第一相关值为所述第三部分中的相邻第一时间单元中的数据之间的差值的相关值;所述第二相关值为第三时间单元中的相邻时间单元中的数据之间的差值的相关值,所述第三时间单元包括所述第三部分中的M个第一时间单元和目标第二时间单元,所述目标第二时 间单元为所述第四部分中的任一第二时间单元;所述第三信号中携带的所述第二子信号的信息比特用第三相关值表征,所述第三相关值为所述第四部分中的相邻第二时间单元中的数据之间的差值的相关值。
- 根据权利要求3所述的方法,其中,所述第一时间单元和所述第二时间单元为相同类型的时间单元,所述第一时间单元和所述第二时间单元包括以下任一项:符号、时隙、子帧、帧。
- 根据权利要求3所述的方法,其中,当所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述M和E等于4时,若所述比特信息为第一值,则所述第一变化情况为第一极性变化与第二极性变化相同,所述第二变化情况为第三极性变化与第四极性变化相反;或者,若所述比特信息为第二值,则所述第一变化情况为第一极性变化与第二极性变化相反,所述第二变化情况为第三极性变化与第四极性变化相同;其中,所述第一极性变化为所述第三部分中的第一个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化,所述第二极性变化为所述第三部分中的第三个第一时间单元中的数据到第四个第一时间单元中的数据的极性变化;或者,所述第一极性变化为所述第三部分中的第二个第一时间单元中的数据到第一个第一时间单元中的数据的极性变化,所述第二极性变化为所述第三部分中的第四个第一时间单元中的数据到第三个第一时间单元中的数据的极性变化;所述第三极性变化为所述第四部分中的第一个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化,所述第四极性变化为所述第四部分中的第三个第二时间单元中的数据到第四个第二时间单元中的数据的极性变化;或者,所述第三极性变化为所述第四部分中的第二个第二时间单元中的数据到第一个第二时间单元中的数据的极性变化,所述第四极性变化为所述第四部分中的第四个第二时间单元中的数据到第三个第二时间单元中的数据的极性变化。
- 根据权利要求3所述的方法,其中,当所述第三信号中携带的所述基信号的比特信息用所述第三部分的第一变化情况与所述第四部分的第二变化情况表征,所述M和E等于3时,若所述比特信息为第一值,则所述第一变化情况为第五极性变化与第六极性变化相同,所述第二变化情况为第七极性变化与第八极性变化相反;或者,若所述比特信息为第二值,则所述第一变化情况为第五极性变化与第六极性变化相反,所述第二变化情况为第七极性变化与第八极性变化相同;其中,所述第五极性变化为所述第三部分中的第一个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化,所述第六极性变化为所述第三部分中的第二个第一时间单元中的数据到第三个第一时间单元中的数据的极性变化;或者,所述第五极性变化为 所述第三部分中的第二个第一时间单元中的数据到第一个第一时间单元中的数据的极性变化,所述第六极性变化为所述第三部分中的第三个第一时间单元中的数据到第二个第一时间单元中的数据的极性变化;所述第七极性变化为所述第四部分中的第一个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化,所述第八极性变化为所述第四部分中的第二个第二时间单元中的数据到第三个第二时间单元中的数据的极性变化;或者,所述第七极性变化为所述第四部分中的第二个第二时间单元中的数据到第一个第二时间单元中的数据的极性变化,所述第八极性变化为所述第四部分中的第三个第二时间单元中的数据到第二个第二时间单元中的数据的极性变化。
- 根据权利要求3所述的方法,其中,当所述第三信号中携带的所述第一子信号的参考比特用第二相关值表征,所述M等于2时,若所述参考比特为第一值,则所述第二相关值为第一差值与第二差值的相关值;或者,若所述参考比特为第二值,则所述第二相关值为第三差值与第四差值的相关值;其中,所述第一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二差值为所述第三部分中的第二个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二差值为所述目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值;所述第三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第四差值为所述第三部分中的第二个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第四差值为所述目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值。
- 根据权利要求3所述的方法,其中,当所述第三信号中携带的所述第一子信号的参考比特用第一相关值表征,所述M等于3时,若所述参考比特为第一值,则所述第一相关值为第五差值与第六差值的相关值,或者,若所述参考比特为第二值,则所述第一相关值为第七差值与第八差值的相关值;其中,所述第五差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第六差值为所述第三部分中的第二个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;或者,所述第五差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第六差值为所述第三部分中的第三个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值;所述第七差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第八差值为所述第三部分中的第二个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;或者,所述第七差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第八差值为所述第三部分中的第三个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值。
- 根据权利要求3所述的方法,其中,当所述第三信号中携带的所述第一子信号的参考比特用第二相关值表征,所述M等于3时,若所述参考比特为第一值,则所述第二相关值为第九差值与第十差值的相关值,或者,若所述参考比特为第二值,则所述第二相关值为第十一差值与第十二差值的相关值;其中,所述第九差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十差值为所述第三部分中的第三个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第九差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十差值为所述目标第二时间单元中的数据减去所述第三部分中的第三个第一时间单元中的数据得到的差值;所述第十一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十二差值为所述第三部分中的第三个第一时间单元中的数据减去所述目标第二时间单元中的数据得到的差值;或者,所述第十一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十二差值为所述目标第二时间单元中的数据减去所述第三部分中的第三个第一时间单元中的数据得到的差值。
- 根据权利要求3所述的方法,其中,当所述第三信号中携带的所述第一子信号的参考比特用第一相关值表征,所述M等于4时,若所述参考比特为第一值,则所述第一相关值为第十三差值与第十四差值的相关值,或者,若所述参考比特为第二值,则所述第一相关值为第十五差值与第十六差值的相关值;其中,所述第十三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十四差值为所述第三部分中的第三个第一时间单元中的数据减去第四个第一时间单元中的数据得到的差值;或者,所述第十三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十四差值为所述第三部分中的第四个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值;所述第十五差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第十六差值为所述第三部分中的第三个第一时间单元中的数据减去第四个第一时间单元中的数据得到的差值;或者,所述第十五差值为所述第三 部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第十六差值为所述第三部分中的第四个第一时间单元中的数据减去第三个第一时间单元中的数据得到的差值。
- 根据权利要求5至10任一项所述的方法,其中,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二值等于1。
- 根据权利要求3所述的方法,其中,当所述E等于4时,若所述信息比特等于第三值,则所述第三相关值为第十七差值与第十八差值的相关值,或者,若所述信息比特等于第四值,则所述第三相关值为第十九差值与第二十差值的相关值;其中,所述第十七差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第十八差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第十七差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值,所述第十八差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值;所述第十九差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值,所述第二十差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第十九差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第二十差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值。
- 根据权利要求12所述的方法,其中,所述第三值等于1,所述第四值等于0;或者,所述第三值等于0,所述第四值等于1。
- 一种信息接收方法,包括:第三设备接收第一设备发送的第三信号;其中,所述第三信号是利用第二信号对第一信号进行反向散射调制得到的,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;所述第三设备根据所述第二设备的个数和所述第三信号,构建第四信号,所述第四信号中携带有所述基信号的比特信息;所述第三设备对所述第四信号进行解调制,获得所述基信号的比特信息。
- 根据权利要求14所述的方法,其中,所述第四信号的构建过程为:将k和i初始化为1;当满足k≤K-2时,执行如下过程,直至k>K-2,并执行 所述K为所述第二设备的个数,所述L为所述第二信号的长度:根据yk,i-1[n]获得pi[n],并执行以及将k设置为k+1,和将i设置为i+1;其中,p1[n]为根据yk,0[n]获得,yk,0[n]为经过信道传输后的第三信号。
- 根据权利要求15所述的方法,其中,所述第四信号包括第三部分和第四部分,所述第三部分占用M个第一时间单元,所述第四部分占用E个第二时间单元,所述M和E为大于或等于2的整数;当所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号时,所述对所述第四信号进行解调制,获得所述基信号的比特信息,包括:所述第三设备对所述第三部分中的每两个相邻的第一时间单元中的数据进行相减,获得第一差值组,以及对所述第四部分中的每两个相邻的第二时间单元中的数据进行相减,获得第二差值组;所述第三设备根据所述第一差值组,确定所述第三部分中的每两个相邻的第一时间单元中的数据的差值的第四相关值,以及根据所述第二差值组,确定所述第四部分中的每两个相邻的第二时间单元中的数据的差值的第五相关值;所述第三设备根据所述第四相关值和所述第五相关值,解调制得到所述基信号的比特信息。
- 根据权利要求16所述的方法,其中,当所述M和E等于4时,所述第一差值组包括:所述第三部分中的第二个第一时间单元中的数据与第一个第一时间单元中的数据的差值,和所述第三部分中的第四个第一时间单元中的数据与第三个第一时间单元中的数据的差值;或者,所述第一差值组包括:所述第三部分中的第一个第一时间单元中的数据与第二个第一时间单元中的数据的差值,和所述第三部分中的第三个第一时间单元中的数据与第四个第一时间单元中的数据的差值;所述第二差值组包括:所述第四部分中的第二个第二时间单元中的数据与第一个第二时间单元中的数据的差值,和所述第四部分中的第四个第二时间单元中的数据与第三个第二时间单元中的数据的差值;或者,所述第二差值组包括:所述第四部分中的第一个第二时间单元中的数据与第二个第二时间单元中的数据的差值,和所述第四部分中的第三个第一时间单元中的数据与第四个第一时间单元中的数据的差值。
- 根据权利要求16所述的方法,其中,当所述M和E等于3时,所述第一差值组包括:所述第三部分中的第二个第一时间单元中的数据与第一个第一时间单元中的数据的差值,和所述第三部分中的第三个第一时间单元中的数据与第二个第一时间单元中的数据的差值;或者,所述第一差值组包括:所述第三部分中的第一个第一时间单元中的数据与第二个第一时间单元中的数据的差值,和所述第三部分中的第二个第一时间单元中的数据与第三个第一时间单元中的数据的差值;所述第二差值组包括:所述第四部分中的第二个第二时间单元中的数据与第一个第二时间单元中的数据的差值,和所述第四部分中的第三个第二时间单元中的数据与第二个第二时间单元中的数据的差值,或者,所述第二差值组包括:所述第四部分中的第一个第二时间单元中的数据与第二个第二时间单元中的数据的差值,和所述第四部分中的第二个第二时间单元中的数据与第三个第二时间单元中的数据的差值。
- 根据权利要求16所述的方法,其中,若所述第一设备发送P个第三信号,对应构建P个第四信号,所述P为大于或等于2的整数;所述对所述第三部分中的每两个相邻的第一时间单元中的数据进行相减,获得第一差值组,以及对所述第四部分中的每两个相邻的第二时间单元中的数据进行相减,获得第二差值组之后,所述方法还包括:所述第三设备对所述P个第四信号对应的P个第一差值组包括的差值进行对位平均,获得第一平均差值组,以及对所述P个第四信号对应的P个第二差值组包括的差值进行对位平均,获得第二平均差值组;其中,所述根据所述第一差值组,确定所述第三部分中的每两个相邻的第一时间单元中的数据的差值的第四相关值,以及根据所述第二差值组,确定所述第四部分中的每两个相邻的第二时间单元中的数据的差值的第五相关值,包括:所述第三设备根据所述第一平均差值组,确定所述第四相关值,以及根据所述第二平均差值组,确定所述第五相关值。
- 根据权利要求16所述的方法,其中,所述根据所述第四相关值和所述第五相关值,解调制得到所述基信号的比特信息,包括:所述第三设备根据预设的调制规则,当所述第四相关值大于或等于所述第五相关值时,确定所述基信号的比特信息为第一值,或者,当所述第四相关值小于所述第五相关值时,确定所述基信号的比特信息为第二值。
- 根据权利要求20所述的方法,其中,所述第一值等于1,所述第二值等于0;或者,所述第一值等于0,所述第二值等于1。
- 根据权利要求15所述的方法,其中,所述第四信号包括第三部分和第四部分,所述第三部分占用M个第一时间单元,所述第四部分占用E个第二时间单元,所述M为大于或等于2的整数,所述E为大于或等于4的整数;当所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号时,所述对所述第四信号进行解调制,获得所述基信号的比特信息,包括:所述第三设备构建所述第四信号中携带的参考比特为第一值时的第六相关值,以及构建所述第四信号中携带的参考比特为第二值时的第七相关值,以及构建所述第四部分中的相邻第二时间单元中的数据之间的差值的第八相关值;其中,所述参考比特与所述基信号中的第一子信号对应,所述第六相关值为与所述第三部分中的相邻第一时间单元中的数据之间的差值相关的值,所述第七相关值为与所述第三部分中的相邻第一时间单元中的数据之间的差值相关的值;所述第三设备根据所述第六相关值、所述第七相关值和所述第八相关值,解调制得到所述基信号中的第二子信号的信息比特。
- 根据权利要求22所述的方法,其中,当所述M等于2时,所述第六相关值为第二十一差值与第二十二差值的相关值,所述第七相关值为第二十三差值与第二十四差值的相关值;其中,所述第二十一差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二十二差值为所述第三部分中的第二个第一时间单元中的数据减去目标第二时间单元中的数据得到的差值;或者,所述第二十一差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二十二差值为目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值;所述第二十三差值为所述第三部分中的第一个第一时间单元中的数据减去第二个第一时间单元中的数据得到的差值,所述第二十四差值为所述第三部分中的第二个第一时间单元中的数据减去目标第二时间单元中的数据得到的差值;或者,所述第二十三差值为所述第三部分中的第二个第一时间单元中的数据减去第一个第一时间单元中的数据得到的差值,所述第二十四差值为目标第二时间单元中的数据减去所述第三部分中的第二个第一时间单元中的数据得到的差值;其中,所述目标第二时间单元为所述第四部分中的任一第二时间单元。
- 根据权利要求22所述的方法,其中,当所述E等于4时,所述第八相关值为第二十五差值与第二十六差值的相关值,或者,所述第八相关值为第二十七差值与第二十八差值的相关值;其中,所述第二十五差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述二十六差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第二十五差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值,所述第二十六差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值;所述第二十七差值为所述第四部分中的第三个第二时间单元中的数据减去第四个第二时间单元中的数据得到的差值,所述第二十八差值为所述第四部分中的第二个第二时间单元中的数据减去第一个第二时间单元中的数据得到的差值;或者,所述第二十七差值为所述第四部分中的第四个第二时间单元中的数据减去第三个第二时间单元中的数据得到的差值,所述第二十八差值为所述第四部分中的第一个第二时间单元中的数据减去第二个第二时间单元中的数据得到的差值。
- 根据权利要求22所述的方法,其中,若所述第一设备发送Z个第三信号,对应构建Z个第四信号,所述Z为大于或等于2的整数;所述第六相关值为根据第三平均差值组确定的相关值,所述第三平均差值为对所述Z个第四信号中的第三差值组包括的差值进行对位平均获得;所述第三差值组包括第二十九差值,或者,所述第三差值组包括第二十九差值和第三十差值,所述第二十九差值包括所述参考比特为第一值时的所述第四信号的第三部分中的相邻第一时间单元中的数据之间的差值,所述三十差值包括所述第四信号的第三部分中的第M个第一时间单元中的数据与目标第二时间单元中的数据的差值,所述目标第二时间单元为所述第四信号的第四部分中的任一第二时间单元;所述第七相关值为根据第四平均差值组确定的相关值,所述第四平均差值为对所述Z个第四信号中的第四差值组包括的差值进行对位平均获得;所述第四差值组包括第三十一差值,或者,所述第四差值组包括第三十一差值和第三十二差值,所述第三十一差值包括所述参考比特为第二值时的所述第四信号的第三部分中的相邻第一时间单元中的数据之间的差值,所述第三十二差值包括所述第四信号的第三部分中的第M个第一时间单元中的数据与目标第二时间单元中的数据的差值,所述目标第二时间单元为所述第四信号的第四部分中的任一第二时间单元;所述第八相关值为根据第五平均差值组确定的相关值,第五平均差值组为对所述Z个第四信号中的第五差值组包括的差值进行对位平均获得,所述第五差值组包括所述第四信号的第四部分中的相邻第二时间单元中的数据之间的差值。
- 根据权利要求22至25任一项所述的方法,其中,所述根据所述第六相关值、所述第七相关值和所述第八相关值,解调制得到所述基信号中的第二子信号的信息比特,包括:所述第三设备根据预先建立的参考比特与信息比特之间的关系,针对所述第四部分,当所述第八相关值与所述第六相关值的乘积大于或等于所述第八相关值与所述第七相关值的乘积时,确定所述第二子信号的信息比特为第三值,或者,当所述第八相关值与所述第六相关值的乘积小于所述第八相关值与所述第七相关值的乘积时,确定所述第二子信号的信息比特为第四值。
- 根据权利要求26所述的方法,其中,所述第三值等于1,所述第四值等于0;或者,所述第三值等于0,所述第四值等于1。
- 一种信息发送装置,包括:第一接收模块,用于接收第一信号;调制模块,用于利用第二信号对所述第一信号进行反向散射调制,生成第三信号;其中,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;所述第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;发送模块,用于发送所述第三信号。
- 一种信息接收装置,包括:第二接收模块,用于接收第一设备发送的第三信号;其中,所述第三信号是利用第二信号对第一信号进行反向散射调制得到的,所述第二信号是根据第二设备的个数和基信号构建得到,所述第二设备的个数大于2;第二设备是提供所述第一信号的设备,所述基信号是通过相邻时间单元中的数据之间的极性变化情况携带比特信息的信号,或者,所述基信号是通过相邻时间单元中的数据之间的差值的相关值携带比特信息的信号;构建模块,用于根据所述第二设备的个数和所述第三信号,构建第四信号,所述第四信号中携带有所述基信号的比特信息;解调制模块,用于对所述第四信号进行解调制,获得所述基信号的比特信息。
- 一种通信设备,包括处理器和存储器,所述存储器存储可在所述处理器上运行的程序或指令,其中,所述程序或指令被所述处理器执行时实现如权利要求1至13任一项所述的信息发送方法的步骤,或者如权利要求14至27任一项所述的信息接收方法的步骤。
- 一种可读存储介质,所述可读存储介质上存储程序或指令,其中,所述程序或指令被处理器执行时实现如权利要求1至13任一项所述的信息发送方法的步骤,或者如权利要求14至27任一项所述的信息接收方法的步骤。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310668966.1A CN119095159A (zh) | 2023-06-06 | 2023-06-06 | 信息发送方法、接收方法、装置、设备及可读存储介质 |
| CN202310668966.1 | 2023-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024251015A1 true WO2024251015A1 (zh) | 2024-12-12 |
Family
ID=93662701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2024/096208 Ceased WO2024251015A1 (zh) | 2023-06-06 | 2024-05-30 | 信息发送方法、接收方法、装置、设备及可读存储介质 |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN119095159A (zh) |
| WO (1) | WO2024251015A1 (zh) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050099269A1 (en) * | 2003-11-10 | 2005-05-12 | Diorio Christopher J. | Method and apparatus to configure an RFID system to be adaptable to a plurality of environmental conditions |
| US20150236841A1 (en) * | 2014-01-30 | 2015-08-20 | Purdue Research Foundation | Communicating data using backscatter modulation |
| CN109547039A (zh) * | 2019-01-16 | 2019-03-29 | 西安交通大学 | 一种智能的环境反向散射通信方法 |
| CN109547183A (zh) * | 2018-12-06 | 2019-03-29 | 电子科技大学 | 一种全双工环境反向散射通信系统、传输方法及资源分配方法 |
| US20200049820A1 (en) * | 2018-08-10 | 2020-02-13 | Aurora Flight Sciences Corporation | System and Method to Reduce DVE Effect on LIDAR Return |
| WO2020233231A1 (zh) * | 2019-05-22 | 2020-11-26 | 华为技术有限公司 | 反向散射通信方法、激励设备、反射设备以及接收设备 |
| CN114374406A (zh) * | 2020-10-14 | 2022-04-19 | 维沃移动通信有限公司 | 信号发送和信号接收方法、终端及通信设备 |
-
2023
- 2023-06-06 CN CN202310668966.1A patent/CN119095159A/zh active Pending
-
2024
- 2024-05-30 WO PCT/CN2024/096208 patent/WO2024251015A1/zh not_active Ceased
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050099269A1 (en) * | 2003-11-10 | 2005-05-12 | Diorio Christopher J. | Method and apparatus to configure an RFID system to be adaptable to a plurality of environmental conditions |
| US20150236841A1 (en) * | 2014-01-30 | 2015-08-20 | Purdue Research Foundation | Communicating data using backscatter modulation |
| US20200049820A1 (en) * | 2018-08-10 | 2020-02-13 | Aurora Flight Sciences Corporation | System and Method to Reduce DVE Effect on LIDAR Return |
| CN109547183A (zh) * | 2018-12-06 | 2019-03-29 | 电子科技大学 | 一种全双工环境反向散射通信系统、传输方法及资源分配方法 |
| CN109547039A (zh) * | 2019-01-16 | 2019-03-29 | 西安交通大学 | 一种智能的环境反向散射通信方法 |
| WO2020233231A1 (zh) * | 2019-05-22 | 2020-11-26 | 华为技术有限公司 | 反向散射通信方法、激励设备、反射设备以及接收设备 |
| CN112073082A (zh) * | 2019-05-22 | 2020-12-11 | 成都华为技术有限公司 | 反向散射通信方法、激励设备、反射设备以及接收设备 |
| CN114374406A (zh) * | 2020-10-14 | 2022-04-19 | 维沃移动通信有限公司 | 信号发送和信号接收方法、终端及通信设备 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119095159A (zh) | 2024-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20250334529A1 (en) | Communication method and apparatus | |
| WO2024037447A1 (zh) | 反向散射通信处理方法、装置、通信设备及可读存储介质 | |
| US20240097853A1 (en) | Channel estimation method and apparatus, device, and readable storage medium | |
| WO2024251015A1 (zh) | 信息发送方法、接收方法、装置、设备及可读存储介质 | |
| WO2024017114A1 (zh) | 反向散射通信方法、设备及可读存储介质 | |
| WO2024046219A1 (zh) | 信息处理方法、装置、通信设备及可读存储介质 | |
| WO2024125516A1 (zh) | 信号传输方法、装置、通信设备及存储介质 | |
| US20250133545A1 (en) | Information sending method and apparatus, information receiving method and apparatus, device, and readable storage medium | |
| WO2024131814A1 (zh) | 传输方法、装置、设备及可读存储介质 | |
| US20250133546A1 (en) | Method and apparatus for transmitting information, method and apparatus for receiving information, device, and readable storage medium | |
| CN120129064A (zh) | 传输资源确定方法、装置、设备及存储介质 | |
| CN118264521A (zh) | 传输方法、装置、设备及可读存储介质 | |
| WO2024046224A1 (zh) | 信息处理方法、装置、通信设备及可读存储介质 | |
| CN117118479B (zh) | 一种基于智能反射面的扩频通信方法、系统、介质及设备 | |
| WO2026002141A1 (zh) | 信号传输方法、装置、通信设备及可读存储介质 | |
| WO2024067598A1 (zh) | 调制、解调方法、装置、设备、系统及存储介质 | |
| WO2025044961A1 (zh) | 信息发送、接收方法、装置、通信设备及可读存储介质 | |
| WO2024125438A1 (zh) | 信号传输方法、装置及设备 | |
| CN117639976A (zh) | 时延信息估计方法、装置、通信设备及存储介质 | |
| CN120150911A (zh) | 一种信息指示方法、装置、通信设备及存储介质 | |
| CN120129037A (zh) | 发射功率控制方法、装置及通信设备 | |
| CN121217218A (zh) | 信号传输方法、装置、通信设备及可读存储介质 | |
| WO2025242108A1 (zh) | 信号传输方法、装置、通信设备及可读存储介质 | |
| CN117640006A (zh) | 帧结构确定方法、装置、通信设备及存储介质 | |
| CN120129031A (zh) | 发射功率控制方法、装置及通信设备 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 24818547 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |