CN107786244B - Method and device for transmitting information - Google Patents

Method and device for transmitting information Download PDF

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Publication number
CN107786244B
CN107786244B CN201610788053.3A CN201610788053A CN107786244B CN 107786244 B CN107786244 B CN 107786244B CN 201610788053 A CN201610788053 A CN 201610788053A CN 107786244 B CN107786244 B CN 107786244B
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frequency
frequency hopping
equal
hopping channel
subcarrier
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CN107786244A (en
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张言飞
张武荣
于光炜
温容慧
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2017/086602 priority patent/WO2018040645A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • H04B2001/71362—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform using a bank of frequency sources

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a method for transmitting information, which is applied to an Orthogonal Frequency Division Multiplexing (OFDM) frequency hopping system and comprises the following steps: determining a first frequency hopping channel, wherein a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier which is not used for carrying useful information, the first frequency hopping channel comprises m continuous subcarriers, the second frequency hopping channel comprises n continuous subcarriers, and m and n are integers which are greater than or equal to 1; transmitting information on the first frequency hopping channel. Therefore, the embodiment of the invention can reduce the signal interference between the first frequency hopping channel and the second frequency hopping channel by transmitting information on the first frequency hopping channel which has one null subcarrier with the adjacent second frequency hopping channel.

Description

Method and device for transmitting information
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting information.
Background
The Orthogonal Frequency Division Multiple Access (OFDMA) is a combination of an Orthogonal Frequency Division Multiplexing (OFDM) technique and a Frequency Division Multiple Access (FDMA), that is, a transmission method in which transmission data is loaded on part of subcarriers after a channel is subcarrier-processed by OFDM.
In addition, in an unauthorized frequency band, frequency resources of frequency spectrum are more, and transmission is suitable for adopting a frequency hopping mechanism, so that the method has better anti-interference and anti-fading performance. If a frequency hopping mechanism is employed in the OFDMA system, it means that the sub-carrier resources allocated to the user equipment vary with time. In each frequency hopping time unit, the user only extracts a plurality of sub-carriers (frequency hopping channels formed by sub-carrier groups) from all sub-carriers for use, and in the next frequency hopping time unit, the user randomly uses other sub-carriers (frequency hopping channels formed by other sub-carrier groups) for use.
In the existing frequency hopping OFDMA scheme, although a frequency hopping channel is composed of specific subcarriers, there is no guard interval between frequency hopping channels, and a signal leaks out of the channel, so the frequency hopping scheme cannot meet the requirement that the bandwidth of the frequency hopping channel must be greater than or equal to 20dB of the signal, which is stipulated by the regulations.
Disclosure of Invention
The embodiment of the invention provides a method for transmitting information, which can reduce signal interference among frequency hopping channels.
In a first aspect, a method for transmitting information is provided, where the method is applied to an orthogonal frequency division multiplexing, OFDM, frequency hopping system, and includes: determining a first frequency hopping channel, wherein a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier which is not used for carrying useful information, the first frequency hopping channel comprises m continuous subcarriers, the second frequency hopping channel comprises n continuous subcarriers, and m and n are integers which are greater than or equal to 1; transmitting information on the first frequency hopping channel.
The subcarriers are the minimum frequency units carrying signals in the frequency domain, and each frequency hopping channel consists of at least one subcarrier, so that the frequency hopping channel is used for carrying useful information sent by a base station or user equipment. The first frequency hopping channel may be any frequency hopping channel in the system bandwidth, which is not limited in the present invention. A null subcarrier exists between the first frequency hopping channel and the adjacent second frequency hopping channel, and the center frequency position of the null subcarrier is the channel boundary between the first frequency hopping channel and the second frequency hopping channel.
It should be appreciated that embodiments of the present invention may transmit information via the first frequency hopping channel and/or the second frequency hopping channel with one null subcarrier.
Therefore, the embodiment of the invention can reduce the signal interference between the first frequency hopping channel and the second frequency hopping channel by transmitting information on the first frequency hopping channel which has one null subcarrier with the adjacent second frequency hopping channel.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the first frequency hopping channel and the second frequency hopping channel are located in a target frequency band, the target frequency band is a subset of an unlicensed frequency band of 902-928MHz, and when 25kHz ≦ (m + n)/2 × f ≦ 250kHz, Q is greater than or equal to 49; and when the frequency is more than or equal to (m + n)/2 x f and less than or equal to 500kHz, Q is more than or equal to 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number and has the unit of kHz.
Therefore, the method of the embodiment of the invention combines the OFDM frequency hopping system with relevant regulation constraints, and divides the subcarrier of the OFDM system into rules to ensure that one subcarrier is left between frequency hopping channels, thereby not only reducing the mutual interference between the channels, but also meeting the regulation limits.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method includes: and shifting a central frequency point of a baseband signal obtained when the user equipment carries out OFDM modulation to a null subcarrier of a target frequency band, wherein the user equipment carries out information transmission on a first frequency hopping channel.
Therefore, the method of the embodiment of the invention can offset the baseband DC position to the null subcarrier, and reduce the interference of the baseband DC to other subcarriers.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the frequency interval f is any one of the following: 3.75kHz, 7.5kHz, 15 kHz.
In a second aspect, a user equipment is provided for performing the method of the first aspect or any possible implementation manner of the first aspect. In particular, the network device comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.
In a third aspect, a network device is provided, configured to perform the method in the first aspect or any possible implementation manner of the first aspect. In particular, the network device comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.
In a fourth aspect, there is provided an apparatus comprising: the device includes: a transceiver, a memory, a processor, and a bus system. Wherein the transceiver, the memory and the processor are connected by the bus system, the memory is configured to store instructions, the processor is configured to execute the instructions stored by the memory to control the transceiver to receive signals and/or transmit signals, and when the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any possible implementation manner of the first aspect.
In a fifth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for carrying out the method of the first aspect or any possible implementation manner of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an illustration of a wireless communication system in accordance with various embodiments described herein.
Fig. 2 is a schematic diagram of a prior art OFDMA frequency hopping system.
Fig. 3A is a schematic diagram of a power spectrum of an OFDMA frequency hopping system without a guard interval.
Fig. 3B is a diagram of a power spectrum of an OFDMA frequency hopping system without a guard interval.
FIG. 4 is a schematic flow diagram of a method of the present invention.
FIG. 5 is a schematic diagram of a method of one embodiment of the invention.
Fig. 6 is a schematic diagram of a method according to another embodiment of the invention.
Fig. 7 is a schematic block diagram of a user equipment of one embodiment of the present invention.
Fig. 8 is a schematic block diagram of a network device of another embodiment of the present invention.
FIG. 9 is a schematic block diagram of an apparatus of one embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 is an illustration of a wireless communication system in accordance with various embodiments described herein.
Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
Furthermore, various embodiments are described herein in connection with a base station. The Base Station may be a Base Transceiver Station (BTS) in GSM (Global System for Mobile communications) or CDMA (Code Division Multiple Access), or an NB (NodeB, Base Station) in WCDMA (Wideband Code Division Multiple Access), or an eNB or eNodeB (evolved Node B) in LTE (Long Term Evolution), or a relay Station or Access point, or a Base Station device in a future 5G network. Moreover, the various embodiments are described in connection with an access terminal, which can also be referred to as a system, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, user device, or UE (user equipment). An access terminal may be a cellular telephone, a cordless telephone, a SIP (Session initiation protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device having Wireless communication capabilities, a computing device, or other processing device connected to a Wireless modem.
Moreover, various aspects or features of the invention may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard Disk, floppy Disk, magnetic strips, etc.), optical disks (e.g., CD (Compact Disk), DVD (Digital Versatile Disk), etc.), smart cards, and flash Memory devices (e.g., EPROM (Erasable Programmable Read-Only Memory), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.
Referring now to fig. 1, a wireless communication system 100 is shown in accordance with various embodiments described herein. The wireless communication system 100 includes a base station 102, and the base station 102 can include multiple antenna groups. Each antenna group can include one or more antennas, e.g., one antenna group can include antennas 104 and 106, another antenna group can include antennas 108 and 110, and an additional group can include antennas 112 and 114. 2 antennas are shown in fig. 1 for each antenna group, however, more or fewer antennas may be utilized for each group. Base station 102 can additionally include a transmitter chain and a receiver chain, each of which can be implemented as a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.
Base station 102 may communicate with one or more access terminals, such as access terminal 116 and access terminal 122. However, it can be appreciated that base station 102 can communicate with any number of access terminals similar to access terminals 116 or 122. The access terminals 116 and 122 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over the wireless communication system 100. As depicted, access terminal 116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to access terminal 116 over forward link 118 and receive information from access terminal 116 over reverse link 120. In addition, access terminal 122 is in communication with antennas 104 and 106, where antennas 104 and 106 transmit information to access terminal 122 over forward link 124 and receive information from access terminal 122 over reverse link 126. In an FDD (Frequency Division Duplex) system, forward link 118 may utilize a different Frequency band than that used by reverse link 120, and forward link 124 may utilize a different Frequency band than that used by reverse link 126, for example. Further, in a TDD (Time Division Duplex) system, forward link 118 and reverse link 120 can utilize a common frequency band and forward link 124 and reverse link 126 can utilize a common frequency band.
Each group of antennas and/or the area in which they are designed to communicate is referred to as a sector of base station 102. For example, antenna groups can be designed to communicate to access terminals in a sector of the areas covered by base station 102. During communication of base station 102 with access terminals 116 and 122 over forward links 118 and 124, respectively, the transmitting antennas of base station 102 can utilize beamforming to improve signal-to-noise ratio of forward links 118 and 124. Moreover, while base station 102 utilizes beamforming to transmit to access terminals 116 and 122 scattered randomly through an associated coverage, mobile devices in neighboring cells can be subject to less interference as compared to a base station transmitting through a single antenna to all its access terminals.
At a given time, a base station 102, an access terminal 116, or an access terminal 122 can be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, a wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting apparatus may acquire (e.g., generate, receive from other communication devices, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving apparatus. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.
Fig. 2 is a schematic diagram of a prior art OFDMA frequency hopping system.
Fig. 2 shows an OFDMA frequency hopping system using 1 OFDM symbol as a frequency hopping time unit. In the figure, the abscissa is a time axis, and 1 OFDM symbol is a time unit; the ordinate is the frequency axis. The plurality of subcarriers form a frequency hopping channel, and one user equipment adopts one frequency hopping channel to transmit signals in a frequency hopping time unit represented by one OFDM symbol. Two user equipments are indicated in the figure: the user equipment 1 and the user equipment 2, taking the user equipment 1 as an example, respectively adopt different frequency hopping channels to transmit signals on two adjacent OFDM symbol units.
In the prior art, there is no guard interval between two adjacent frequency hopping channels, that is, the last subcarrier of one frequency hopping channel and the first subcarrier of the adjacent frequency hopping channel are two adjacent subcarriers.
In the 902-plus 928MHz unlicensed frequency band in the Laue area, according to the FCC regulations in the United states, the following requirements are made for the channel division of the frequency hopping system: the frequency hopping channels of a frequency hopping system are divided by the 20dB bandwidth of the signal or by a channel spacing of at least 25kHz, whichever is greater. Therefore, the frequency hopping channel interval is equal to or greater than 25kHz, and the 20dB bandwidth of the signal can not exceed the channel bandwidth.
Thus, the bandwidth of the frequency hopping channel must be equal to or greater than 20dB of the signal, and the out-of-band power spectral density of OFDM systems drops slowly, signal leakage out of the channel, and power at the channel boundaries is high, making it difficult to drop the out-of-band power below 20dB even with filtering or "windowing". As shown in fig. 3, fig. 3A and 3B are diagrams of power spectra of an OFDMA frequency hopping system without a guard interval, wherein vertical lines are boundaries of frequency hopping channels, and each boundary corresponds to a center frequency of a subcarrier at an edge position of one frequency hopping channel in the OFDM system. The signal shown in fig. 3A is not filtered and the signal in fig. 3B is a filtered signal power spectrum, and it can be seen that even if filtered, the signal power at the channel boundary still does not drop below 20 dB. Therefore, such a frequency hopping scheme without a guard interval cannot satisfy regulatory restrictions.
FIG. 4 is a schematic flow diagram of a method of the present invention. As shown in fig. 4, the execution subject of the method may be a user equipment or a network equipment, and the method includes:
step 410, determining a first frequency hopping channel, where a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier that is not used for carrying useful information, the first frequency hopping channel includes m consecutive subcarriers, the second frequency hopping channel includes n consecutive subcarriers, and m and n are integers greater than or equal to 1.
Information is transmitted on a first frequency hopping channel, step 420.
Specifically, in step 410, the subcarrier is the smallest frequency unit carrying a signal in the frequency domain, and each frequency hopping channel is composed of at least one subcarrier, so that the frequency hopping channel is used for carrying useful information transmitted by a base station or a user equipment. The first frequency hopping channel may be any frequency hopping channel in the system bandwidth, which is not limited in the present invention. A null subcarrier exists between the first frequency hopping channel and the adjacent second frequency hopping channel, and the center frequency position of the null subcarrier is the channel boundary between the first frequency hopping channel and the second frequency hopping channel.
It should be understood that m and n may be equal or unequal, and the present invention is not limited thereto, and preferably n-m-7.
In step 420, it should be understood that transmitting information on the first frequency hopping channel or the second frequency hopping channel may refer to uplink data transmission from the user equipment to the network device, or may refer to downlink data transmission from the network device to the user equipment. It is also to be understood that the user equipment may select transmission of signals on the first frequency hopping channel and/or the second frequency hopping channel on different time domains.
Specifically, taking the example that the user equipment sends information to the network device in uplink data, in the same time period, the user equipment 1 may perform data transmission on the first frequency hopping channel, and the user equipment 2 may select to perform data transmission on the second frequency hopping channel. Because the first frequency hopping channel and the second frequency hopping channel have a null subcarrier, the effect of signal isolation can be achieved.
Specifically, if the network device receives a signal sent by the user equipment, signals of different user equipments may be carried on the first frequency hopping channel and the second frequency hopping channel, and a null subcarrier exists between the first frequency hopping channel and the second frequency hopping channel, so that the effect of signal isolation may also be achieved.
It should be appreciated that different hopping channels may be selected for data transmission during different time periods for the same user equipment.
Therefore, the embodiment of the invention can reduce the signal interference between the first frequency hopping channel and the second frequency hopping channel by transmitting information on the first frequency hopping channel which has one null subcarrier with the adjacent second frequency hopping channel.
Optionally, as an embodiment of the present invention, the first frequency hopping channel and the second frequency hopping channel are located in a target frequency band, the target frequency band is a subset of the 902-928MHz unlicensed frequency band,
when the frequency is less than or equal to 25kHz and less than or equal to [ (m + n)/2] min f and less than or equal to 250kHz, Q is more than 49;
and when the frequency is less than or equal to 250kHz and less than or equal to [ (m + n)/2] min f and less than or equal to 500kHz, Q is more than 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number.
That is, when the method is applied to the unlicensed band of 902-928MHz in the ramework area, according to the U.S. regulations, the number of frequency hopping channels is limited as follows: if the bandwidth of the frequency hopping channel is less than 250kHz, the frequency hopping system at least uses 50 frequency hopping channels; if the bandwidth of the frequency modulation channel is more than or equal to 250kHz, the frequency hopping system at least uses 25 frequency hopping channels.
Wherein, (m + n)/2 f refers to a distance between center frequency points of the first frequency hopping channel and the second frequency hopping channel, and [ (m + n)/2] min refers to a minimum value of the distance between the center frequency points of the first frequency hopping channel and the second frequency hopping channel.
Therefore, the method of the embodiment of the invention combines the OFDM frequency hopping system with relevant regulation constraints, and divides the subcarrier of the OFDM system into rules to ensure that one subcarrier is left between frequency hopping channels, thereby not only reducing the mutual interference between the channels, but also meeting the regulation limits.
Optionally, as an embodiment of the present invention, a center frequency point of a baseband signal obtained when user equipment performs OFDM modulation is shifted to a null subcarrier of a target frequency band, where the user equipment performs information transmission on a first frequency hopping channel. It should be understood that the center of the baseband signal, i.e. the position of the Direct Component (DC), is relatively noisy when the baseband signal is up-converted before being transmitted, so that the position is not usable, and the farther the position is from other useful subcarriers, the better the position is, for example, in LTE, the center of the baseband signal is only half a subcarrier from a subcarrier carrying a useful signal, so that, since a null subcarrier exists between two adjacent channels in the embodiment of the present invention, by shifting the center frequency point of the baseband signal obtained when the user equipment performs OFDM modulation to a null subcarrier of a target frequency band, that is, by modulating the baseband DC position at the center of the null subcarrier, a distance of 1 subcarrier interval between the baseband DC position and the subcarrier carrying the useful signal can be achieved.
Specifically, taking LTE as an example, when an uplink SC-FDMA baseband signal is generated, the baseband signal is shifted by half a subcarrier (k +1/2 in the formula), so that DC corresponds to the middle position of two subcarriers. In the embodiment of the present invention, since one subcarrier is empty between channels, when an SC-FDMA baseband signal is generated, one subcarrier is shifted (k + n, n is 1 in the formula), and DC can be exactly mapped to the empty subcarrier. This results in DC being spaced exactly one subcarrier from the subcarriers used on both sides. Thus, the DC will interfere less with the subcarriers used.
Figure BDA0001103233670000091
The formula represents a time domain continuous signal on a symbol l on an antenna port p
Figure BDA0001103233670000092
And generating a formula.
Wherein
Figure BDA0001103233670000093
Is the total number of sub-carriers used by the system,
Figure BDA0001103233670000094
in order to round the symbol down,
Figure BDA0001103233670000095
in order to round up the symbol,
Figure BDA0001103233670000096
numbering the subcarriers on the current time domain symbol l
Figure BDA0001103233670000097
Assumption is made by way of example
Figure BDA0001103233670000098
Then there are 100 subcarriers in the uplink, and k is equal to
Figure BDA0001103233670000099
To
Figure BDA00011032336700000910
I.e., -50 to 49, k(-)The value range of (1) is 0-99. T issIs a sampling period, NCP,lIs a constant, n is a positive integer.
The significance of the above formula is: for the time domain symbol l, starting from the subcarrier with number 0 (i.e. the first subcarrier, the subcarrier with the lowest center frequency), the modulation content (carried information) on each subcarrier is
Figure BDA00011032336700000911
(if the subcarrier is not used, it is 0), a different e-exponent is multiplied on each subcarrier
Figure BDA00011032336700000912
(i.e., loading frequency information). And finally, superposing the signals of each subcarrier after the frequency loading to obtain a baseband signal on the symbol l. k represents the number of each subcarrier, and + n represents that each subcarrier is shifted by n subcarriers toward high frequency during modulation, with the final effect that the baseband signal as a whole is shifted by n subcarriers toward high frequency.
For example, in the embodiment of the present invention, when n is 1, it indicates that each subcarrier is shifted by 1 subcarrier to a high frequency in modulation, and the final effect is that the baseband signal as a whole is shifted by 1 subcarrier to a high frequency.
Therefore, the method of the embodiment of the invention can offset the baseband DC position to the null subcarrier, and reduce the interference of the baseband DC to other subcarriers.
Optionally, as an embodiment of the present invention, the frequency interval f is any one of the following:
3.75kHz，7.5kHz，15kHz。
FIG. 5 is a schematic diagram of a method of one embodiment of the invention.
As shown in fig. 5, the subcarrier spacing between two adjacent subcarriers is 3.75kHz, so there are 401 total subcarriers in the bandwidth of 1.5MHz, which are numbered [0, 1, 2, … …, 400], respectively, where the subcarrier numbered 8 × 1 (i-1) is not used to carry useful information and is called a null subcarrier, the null subcarrier is used as a boundary of a hopping channel, 7 subcarriers are included in the boundary of the hopping channel of one hopping channel and are used to carry or transmit useful signals, and the subcarriers numbered 0 and 400 are used as a boundary of the entire system bandwidth and are not counted, so there are 49 null subcarriers.
As shown in fig. 5, the subcarrier spacing is 3.75kHz, and there is a null subcarrier at every 7 consecutive subcarriers, and the number of null subcarriers is not less than 49.
Fig. 6 is a schematic diagram of a method according to another embodiment of the invention.
As shown in fig. 6, in the LTE system, 15kHz is used as a subcarrier interval, and a total of 12 hopping channels, each subcarrier is empty of one subcarrier as a boundary of the hopping channel, and each hopping channel includes one subcarrier. Specifically, the solid line in the figure is the used subcarriers, and the dotted line is the null subcarriers. Thus, shifting by one subcarrier can shift the DC of the baseband to the null subcarrier when generating the baseband signal.
Fig. 7 is a schematic block diagram of a user equipment of one embodiment of the present invention. As shown in fig. 7, the user equipment 700 is applied in an OFDM frequency hopping system, and includes:
a determining unit 710, where the determining unit 710 is configured to determine a first frequency hopping channel, where a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier that is not used for carrying useful information, the first frequency hopping channel includes m consecutive subcarriers, and the second frequency hopping channel includes n consecutive subcarriers, where m and n are integers greater than or equal to 1;
a transmitting unit 720, wherein the transmitting unit 720 is configured to transmit information on the first hopping channel.
Optionally, as an embodiment of the present invention, the first frequency hopping channel and the second frequency hopping channel are located in a target frequency band, the target frequency band is a subset of the 902-928MHz unlicensed frequency band,
when the frequency is less than or equal to 25kHz and less than or equal to (m + n)/2 f and less than or equal to 250kHz, Q is more than or equal to 49;
and when the frequency is more than or equal to (m + n)/2 x f and less than or equal to 500kHz, Q is more than or equal to 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number and has the unit of kHz.
Optionally, as an embodiment of the present invention, the determining unit 710 is further configured to:
and shifting the central frequency point of the baseband signal obtained when the user equipment carries out OFDM modulation to a null subcarrier of a target frequency band.
Optionally, as an embodiment of the present invention, the frequency interval f is any one of the following:
3.75kHz，7.5kHz，15kHz。
therefore, the embodiment of the invention can reduce the signal interference between the first frequency hopping channel and the second frequency hopping channel by transmitting information in the first frequency hopping channel and/or the second frequency hopping channel with one null subcarrier.
Fig. 8 is a schematic block diagram of a network device of another embodiment of the present invention. The network device 800 is applied to an orthogonal frequency division multiplexing, OFDM, frequency hopping system, and includes:
a determining unit 810, where the determining unit 810 is configured to determine a first frequency hopping channel and a second frequency hopping channel located in a target frequency band, where a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier that is not used for carrying useful information, the first frequency hopping channel includes m consecutive subcarriers, the second frequency hopping channel includes n consecutive subcarriers, and m and n are integers greater than or equal to 1;
a receiving unit 810, wherein the receiving unit 820 is configured to receive information on the target frequency band.
Optionally, as an embodiment of the present invention, the target frequency band is a subset of the 902-928MHz unlicensed frequency band,
when the frequency is less than or equal to 25kHz and less than or equal to (m + n)/2 f and less than or equal to 250kHz, Q is more than or equal to 49;
and when the frequency is more than or equal to (m + n)/2 x f and less than or equal to 500kHz, Q is more than or equal to 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number and has the unit of kHz.
Optionally, as an embodiment of the present invention, the frequency interval f is any one of the following:
3.75kHz，7.5kHz，15kHz。
therefore, the embodiment of the invention can reduce the signal interference between the first frequency hopping channel and the second frequency hopping channel by transmitting information in the first frequency hopping channel and/or the second frequency hopping channel with one null subcarrier.
FIG. 9 is a schematic block diagram of an apparatus of one embodiment of the present invention. As shown in fig. 9, the apparatus 900 includes a processor 910, a transceiver 920, a memory 930, and a bus system 940. The processor 910, the transceiver 920 and the memory 930 are connected by a bus system 940, the memory 930 is used for storing instructions, and the processor 910 is used for executing the instructions stored in the memory 930 to control the transceiver 920 to transmit and receive signals.
Memory 930 may include both read-only memory and random-access memory and provides instructions and data to processor 910. The various components of the transmitting device 900 are coupled together by a bus system 940, where the bus system 940 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are identified in the figure as the bus system 940. For example, the transmitting apparatus 900 may be the base station 102 shown in fig. 1. The sending apparatus 900 can implement the corresponding process in the foregoing method embodiment, and is not described here again to avoid repetition.
It should be understood that, in the embodiment of the present invention, the processor 910 may be a Central Processing Unit (CPU), and the processor 910 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Memory 930 may include both read-only memory and random-access memory and provides instructions and data to processor 11. A portion of the memory 930 may also include non-volatile random access memory. For example, the memory 930 may also store device type information.
The bus system 940 may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. For clarity of illustration, however, the various buses are identified in the figure as the bus system 940.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 910. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 930, and the processor 910 reads the information in the memory 930, and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.
Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The methods or steps described in connection with the embodiments disclosed herein may be embodied in hardware, a software program executed by a processor, or a combination of both. The software routines may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or alterations to the embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and such modifications or alterations are intended to be within the scope of the present invention.

Claims (11)

1. A method for transmitting information, the method is applied to an Orthogonal Frequency Division Multiplexing (OFDM) frequency hopping system, and is characterized by comprising the following steps:
determining a first frequency hopping channel, wherein a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier which is not used for carrying useful information, the first frequency hopping channel comprises m continuous subcarriers, the second frequency hopping channel comprises n continuous subcarriers, and m and n are integers which are greater than or equal to 1;
transmitting information on the first frequency hopping channel.
2. The method of claim 1 wherein the first frequency hopping channel and the second frequency hopping channel are located in a target frequency band, the target frequency band is a subset of 902-928MHz unlicensed frequency band,
when the frequency is less than or equal to 25kHz and less than or equal to (m + n)/2 f and less than or equal to 250kHz, Q is more than or equal to 49;
and when the frequency is more than or equal to (m + n)/2 x f and less than or equal to 500kHz, Q is more than or equal to 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number and has the unit of kHz.
3. The method according to claim 1 or 2, characterized in that the method comprises:
and shifting the central frequency point of the baseband signal obtained during OFDM modulation to a null subcarrier of the target frequency band.
4. The method of claim 2, wherein the frequency interval f is any one of:
3.75kHz，7.5kHz，15kHz。
5. a user equipment, wherein the user equipment is used in an orthogonal frequency division multiplexing, OFDM, frequency hopping system, comprising:
a determining unit, configured to determine a first frequency hopping channel, where a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier that is not used for carrying useful information, the first frequency hopping channel includes m consecutive subcarriers, the second frequency hopping channel includes n consecutive subcarriers, and m and n are integers greater than or equal to 1;
a transmitting unit configured to transmit information on the first hopping channel.
6. The UE of claim 5, wherein the first frequency hopping channel and the second frequency hopping channel are located in a target frequency band, the target frequency band is a subset of 902-928MHz unlicensed frequency band,
when the frequency is less than or equal to 25kHz and less than or equal to (m + n)/2 f and less than or equal to 250kHz, Q is more than or equal to 49;
and when the frequency is more than or equal to (m + n)/2 x f and less than or equal to 500kHz, Q is more than or equal to 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number and has the unit of kHz.
7. The UE of claim 5 or 6, wherein the determining unit is further configured to:
and shifting the central frequency point of the baseband signal obtained when the user equipment carries out OFDM modulation to a null subcarrier of a target frequency band.
8. The UE of claim 6, wherein the frequency interval f is any one of the following:
3.75kHz，7.5kHz，15kHz。
9. a network device, applied to an orthogonal frequency division multiplexing, OFDM, frequency hopping system, comprising:
a determining unit, configured to determine a first frequency hopping channel and a second frequency hopping channel located in a target frequency band, where a null subcarrier exists between the first frequency hopping channel and an adjacent second frequency hopping channel, the null subcarrier is a subcarrier that is not used for carrying useful information, the first frequency hopping channel includes m consecutive subcarriers, the second frequency hopping channel includes n consecutive subcarriers, and m and n are integers greater than or equal to 1;
a receiving unit, configured to receive information on the target frequency band.
10. The network device as claimed in claim 9, wherein the target frequency band is a subset of 902-928MHz unlicensed frequency band,
when the frequency is less than or equal to 25kHz and less than or equal to (m + n)/2 f and less than or equal to 250kHz, Q is more than or equal to 49;
and when the frequency is more than or equal to (m + n)/2 x f and less than or equal to 500kHz, Q is more than or equal to 24, wherein Q is the number of the empty subcarriers on the target frequency band, f is the frequency interval between two adjacent subcarriers, and f is a positive real number and has the unit of kHz.
11. The network device of claim 10, wherein the frequency interval f is any one of the following:
3.75kHz，7.5kHz，15kHz。
CN201610788053.3A 2016-08-31 2016-08-31 Method and device for transmitting information Expired - Fee Related CN107786244B (en)

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