CN101291313B - Wireless signal transmitting method, system and mobile station - Google Patents
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Abstract
The invention relates to the wireless communication field and discloses a wireless signal transmission method, a wireless signal transmission system and a wireless signal transmission mobile station, which further improve the utilization rate of frequency spectra in an OFDM-based system. The method is as follows: multipath data streams are respectively encoded; encoding results of various paths are respectively interweaved by utilization of different interweavers; encoding results of various paths are modulated on the same time frequency resource by means of OFDM and then transmitted; the data streams are divided into a plurality of sets; and different data streams on the same time frequency resource are distinguished in each set through different interweaving means and different sets use different time frequency resources. The encoding means comprises spread spectrum coding, repeated coding, debugging coding and so on; DFT conversion can be performed on interweaving results at first and then OFDM modulation can be performed on the interweaving results; long interweavers can be formed by concatenation of a plurality of short interweavers; and the multipath data streams are different layers of data streams in the same mobile station and also can be data streams of different mobile stations.
Description
Technical Field
The present invention relates to the field of wireless communication, and in particular, to a signal transmission technology based on Orthogonal Frequency Division Multiplexing (OFDM).
Background
In recent years, a multicarrier transmission technique represented by Orthogonal Frequency Division Multiplexing (OFDM) has attracted much attention. OFDM is actually one of Multi-Carrier Modulation (MCM for short). The main idea is as follows: the channel is divided into a plurality of orthogonal sub-channels, the high-speed data signal is converted into parallel low-speed sub-data streams, and the parallel low-speed sub-data streams are modulated to each sub-channel for transmission. The orthogonal signals may be separated by using correlation techniques at the receiving end, which may reduce inter-channel Interference (ICI) between the sub-channels. The signal bandwidth on each subchannel is less than the associated bandwidth of the channel, and therefore can be viewed as flat fading on each subchannel, so that intersymbol interference can be eliminated. And since the bandwidth of each sub-channel is only a small fraction of the original channel bandwidth, channel equalization becomes relatively easy.
Multiple Access, i.e., Orthogonal Frequency Division Multiple Access (OFDMA), can be implemented on the basis of OFDM. The problem solved by the multiple access technique is that in a mobile communication system, many mobile stations communicate with other mobile stations through one base station at the same time, so that different characteristics must be given to signals sent by different mobile stations and base stations, so that the base station can distinguish which mobile station sends out the signals from signals of many mobile stations, and each mobile station can identify which signal sent out by the base station is the signal sent to itself.
The inventor of the invention finds that the frequency spectrum of the current OFDM-based system is not fully utilized, and the frequency spectrum utilization rate is possibly further improved.
Disclosure of Invention
The main technical problem to be solved by the embodiments of the present invention is to provide a method, a system and a mobile station for transmitting wireless signals, so that the frequency spectrum utilization rate of an OFDM-based system is further improved.
In order to solve the above technical problem, an embodiment of the present invention provides a wireless signal transmitting method, including:
respectively carrying out redundancy coding on at least two paths of data streams, wherein each path of data stream is a different layer of data stream of the same mobile station; respectively interleaving the coding result of each path by using different interleavers; modulating each path of interleaving result on the same time frequency resource in an Orthogonal Frequency Division Multiplexing (OFDM) mode for transmitting; the modulating the interleaving results of each path on the same time frequency resource in an OFDM mode comprises the following steps: and superposing the interweaving results of the paths into a path of signal, mapping the path of signal to a time frequency resource, and transmitting after OFDM modulation.
An embodiment of the present invention further provides a wireless signal transmitting system, including:
n coding units, which are respectively used for carrying out redundancy coding on N data streams, wherein the N data streams are different layer data streams of the same mobile station;
n different interleavers, which are respectively used for interleaving the coding result output by each coding unit;
a transmitting unit, configured to modulate the interleaving results output by each interleaver in an OFDM manner on the same time-frequency resource for transmission, where the transmitting unit includes:
the adder is used for superposing the interleaving results output by the interleavers into a path of signal;
a mapping subunit, configured to map the signal output by the adder to a time-frequency resource;
the modulation subunit is used for carrying out OFDM modulation on the output result of the mapping subunit and then transmitting the output result;
wherein N is an integer greater than 1.
An embodiment of the present invention further provides a mobile station, including:
a coding unit, configured to perform redundancy coding on at least two data streams, where each data stream is a different layer data stream of the mobile station;
the interleaver is used for interleaving the coding result output by the coding unit;
a transmitting unit, configured to modulate the interleaving result output by the interleaver in an OFDM manner on a time-frequency resource shared with other mobile stations, and transmit the result, including: and superposing the interleaving results of all paths into a path of signal, mapping the signal to a time frequency resource, and transmitting after OFDM modulation.
The embodiment of the invention also provides a wireless signal transmitting method, wherein each group of K data stream groups is transmitted by using the method, wherein different data stream groups use different time-frequency resources, K is an integer greater than or equal to 2, and each data stream group comprises at least two data streams.
The embodiment of the invention also provides a wireless signal transmitting system, which comprises K subsystems, wherein each subsystem is the wireless signal transmitting system, different subsystems use different time-frequency resources, and K is an integer greater than or equal to 2.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
by using different interleavers, multiple data streams can share the same time-frequency resource, and a receiving end can recover each data stream from the same time-frequency resource according to different interleaving modes, thereby improving the frequency spectrum utilization rate of the system.
Drawings
Fig. 1 is a flowchart of a wireless signal transmission method according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of encoding according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the difference between distributed mapping and centralized mapping according to the first embodiment of the present invention;
fig. 4 is a schematic diagram of a signal transmission method of a plurality of mobile stations according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a specific implementation of a signal transmission method for a plurality of mobile stations according to a first embodiment of the present invention;
fig. 6 is a schematic diagram of a cascade of two interleavers in a wireless signal transmission method according to a third embodiment of the present invention;
fig. 7 is a flowchart of a wireless signal transmission method according to a fourth embodiment of the present invention;
fig. 8 is a diagram illustrating a method for transmitting wireless signals of a plurality of groups of mobile stations according to a fourth embodiment of the present invention;
fig. 9 is a flowchart of a wireless signal transmission method according to a fifth embodiment of the present invention;
fig. 10 is a schematic diagram of a distributed mapping scheme according to a fifth embodiment of the present invention;
fig. 11 is a diagram illustrating a wireless signal transmission method of a plurality of mobile stations according to a fifth embodiment of the present invention;
fig. 12 is a flowchart of a wireless signal transmission method according to a sixth embodiment of the present invention;
fig. 13 is a schematic diagram of a wireless signal transmission system according to a seventh embodiment of the present invention;
fig. 14 is a schematic diagram illustrating an implementation of adding power control in a wireless signal transmission method according to a first embodiment of the present invention;
fig. 15 is a schematic diagram of a specific implementation of a signal transmission method for a plurality of mobile stations according to a second embodiment of the present invention;
fig. 16 is an exemplary schematic diagram of another implementation of a wireless signal transmission method according to the present invention;
fig. 17 is a schematic diagram illustrating another other implementation manner of the wireless signal transmission method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A first embodiment of the present invention relates to a method for transmitting a wireless signal, in which each data stream is a data stream of different layers of the same mobile station, that is, a mobile station transmits data streams of different layers on the same time-frequency resource, and a specific flow is shown in fig. 1.
In step 110, the mobile station performs redundancy coding on each data stream. Specifically, the mobile station performs error correction coding on each data stream to reduce the information transmission rate, and increases the accuracy of information transmission by increasing redundancy, thereby increasing the probability of being correctly decoded at the receiving end. The error correction code may be a convolutional code, a Turbo code, an LDPC code, or other error correction code. The mobile station then performs spread spectrum coding and/or repetition coding on each error correction coded data stream, as shown in fig. 2. Since the repetition code repeats information by a certain rule, diversity in time can be obtained. The repetition code functions equivalently to spreading, so a spreading code may be used instead. The spreading codes used for the data streams may be the same or different. One effective information bit is expanded into a plurality of effective information bits through spread spectrum coding and/or repeated coding, the coding redundancy is high, on one hand, the probability of being correctly solved at a receiving end can be improved, and on the other hand, the high redundancy enables a system to have a low error rate when multiple paths of data streams multiplex the same time-frequency resources.
In practical applications, only one of a repetition code (or a spreading code) and an error correction code may be used. Different encoding schemes may be used for different data streams.
Then, the process proceeds to step 120, where the mobile station interleaves the coding result of each channel by using different interleavers. Specifically, the mobile station allocates interleavers having different interleaving rules to the respective data streams, and distinguishes the different data streams using the interleavers having different interleaving rules. The coded data streams of each path are respectively interleaved through corresponding interleavers, and then the mobile station superposes the interleaved data streams of each path into a signal of each path.
Then, step 130 is entered, the ms maps one path of superimposed signals to time frequency resources, and performs OFDM modulation and then transmits the signals. Specifically, since the OFDM modulation front end includes an N-point Inverse Fast Fourier Transform (IFFT) module, carrier mapping is to select the position of a mapping point from N IFFT subcarriers, that is, to select M required subcarriers (N is not less than M) from N IFFT subcarriers. At present, the carrier mapping is realized by distributed mapping and centralized mapping, and compared with centralized mapping, the distributed mapping has better frequency diversity effect. The difference between the distributed mapping and the centralized mapping is shown in fig. 3, where (a) is a schematic diagram of the centralized mapping and (b) is a schematic diagram of the distributed mapping.
In the embodiment, different interleavers are used, so that multiple data streams can share the same time-frequency resource, and a receiving end can recover each data stream from the same time-frequency resource according to different interleaving modes, thereby improving the spectrum utilization rate of the system.
Although the signal transmission method of one mobile station is described as an example in the present embodiment, in practical application, there may be k mobile stations, each of which uses the same signal transmission method in the present embodiment, and as shown in fig. 4, signals of different mobile stations are distinguished by being mapped onto different time-frequency resources. Since each mobile station maps its own signal to a time-frequency resource different from that of other mobile stations, the set of interleavers of each mobile station may be the same as or different from those of other mobile stations.
Fig. 5 is a schematic diagram of a specific implementation of a signal transmission method for multiple mobile stations, where Phase Shift Keying (PSK) is a modulation method, and may be placed before or after an interleaver. The n interleavers used by the mobile station 1 may be the same as or different from the n interleavers used by the mobile station k. For a certain mobile station, such as the kth mobile station, the original signal dk is converted in serial-to-parallel to obtain n layers of parallel data dk, n, and then coded by a coding module to obtain data streams bk, n, and then data streams xk, n are obtained by an interleaver, and then the data streams after interleaving and PSK modulation are superimposed to sk, and sk is mapped to time-frequency resources, and then OFDM modulation is performed to transmit. Each mobile station maps the data of each mobile station to different time frequency resources in different carrier wave mapping modes, and then the data is modulated and transmitted through OFDM.
It should be noted that before superimposing the data streams after PSK modulation as sk, power control may be performed on each data stream after PSK modulation, and then the data streams after power control may be superimposed as sk, as shown in fig. 14. By controlling the power of each path of data stream, the interference of each path of data stream can be distinguished more obviously, so that the receiving end can recover each path of data stream more conveniently.
A second embodiment of the present invention relates to a wireless signal transmission method, which is substantially the same as the first embodiment, except that in the first embodiment, for a certain mobile station, for example, a kth mobile station, n layers of parallel data dk, n are obtained by performing serial-to-parallel conversion on original serial data, and then error correction coding is performed on each layer of parallel data (as shown in fig. 5); in the present embodiment, however, the serial data is error correction encoded first, and then the error correction encoded serial data is converted into n-layer parallel data, as shown in fig. 15.
Since the present embodiment can still use different interleavers to enable multiple data streams to share the same time-frequency resource, the present embodiment has the same beneficial effects as the first embodiment.
It is obvious that the essence of the first and second embodiments lies in that at least two paths of data streams are respectively redundantly encoded, the encoding results of each path are respectively interleaved by using different interleavers, and the interleaving results of each path are modulated on the same time-frequency resource in an OFDM manner to be transmitted, so as to achieve the purpose of improving the utilization rate of the system frequency spectrum. Therefore, in practical applications, there may be other specific implementation methods different from the first and second embodiments.
For example, the data of the mobile station is error-correction-encoded before serial-to-parallel conversion, and after the serial data is converted into the parallel data, the data may be directly interleaved (as shown in fig. 16), or after the serial data is converted into the parallel data, the converted parallel data may be encoded and then interleaved, and the converted parallel data may be encoded by an error correction code or other codes, or a combination of an error correction code and other codes (as shown in fig. 17).
A third embodiment of the present invention relates to a radio signal transmission method, and the present embodiment is an improvement of the first embodiment, in terms of interleaving processing of each data stream.
Specifically, in the present embodiment, interleavers having different rules assigned to the respective data streams are formed by cascading two interleavers shorter than the interleaver. For example, if the codeword length after error correction coding is N and the spreading factor (or the number of times of repetition codes, the inverse of the repetition code rate) is G, the processing length of the interleaver is N × G. In the first embodiment, the interleaver having the processing length of N × G is directly used, and the interleaver having the processing length of N × G may be generated by using a random interleaver. In the present embodiment, G random interleavers having a processing length of N are used to form an interleaver having a processing length of G × N in a cascade configuration.
As shown in fig. 6, assuming that the codeword length after error correction coding is 5 and the data stream after spreading factor (repetition number) is 1234512345, in the present embodiment, one interleaver having a corresponding processing length of 5 is allocated to each data block of 12345, and data in the data block is interleaved.
The interleaver with the processing length of L is formed by cascading n interleavers with the processing length of L/n, so that the hardware implementation is more convenient, and the processing time delay is shorter.
A fourth embodiment of the present invention relates to a wireless signal transmission method, which is substantially the same as the first embodiment, except that in the first embodiment, each data stream is a different layer data stream of the same mobile station, and therefore, the mobile station can transmit each data stream on the same time-frequency resource by superimposing each encoded and interleaved data stream into one signal. In the present embodiment, each data stream is a data stream of a different mobile station, as shown in fig. 7. The interleaver of each mobile station is an interleaver with different interleaving rules, the interleaver group is used for distinguishing data streams of different mobile stations, and each mobile station modulates the interleaved data stream of the mobile station on the same time-frequency resource in an OFDM mode and transmits each path of data stream on the same time-frequency resource. The receiving end can recover each path of data stream from the same time frequency resource according to different interleaving modes, thereby improving the frequency spectrum utilization rate of the system.
It should be noted that each mobile station shown in fig. 7 may be regarded as a group of mobile stations, and in practical applications, a plurality of such mobile stations may be included, as shown in fig. 8.
For each group, the mobile stations are distinguished by a different regular interleaver in the group; the mobile stations in each group are distinguished by mapping to different time-frequency resources between groups, so that the interleavers in different groups can be the same or different.
A fifth embodiment of the present invention relates to a wireless signal transmitting method, which is substantially the same as the first embodiment, and the difference is that in the first embodiment, after being superimposed, each interleaved data stream is directly mapped onto a time-frequency resource, and in the present embodiment, after being superimposed, each interleaved data stream is first subjected to Discrete Fourier Transform (DFT) and then mapped onto a time-frequency resource. Each data stream in the present embodiment is also a different layer data stream of the same mobile station.
Specifically, as shown in fig. 9, in step 910, the mobile station performs redundancy coding on each data stream. This step is identical to step 110, and is not described herein again.
Next, the process proceeds to step 920, where the mobile station interleaves the coding result of each channel using different interleavers. This step is completely the same as step 120, and is not described herein again.
Next, in step 930, the mobile station performs DFT conversion on the superimposed single-channel signal. In practical applications, the DFT is usually implemented by Fast Fourier Transform (FFT).
Then, step 940 is entered, the mobile station maps the DFT-transformed channel signal to time-frequency resources, and performs OFDM modulation and then transmits. The DFT-transformed channel signal may be mapped to time-frequency resources by using a distributed mapping and a centralized mapping, and the distributed mapping is shown in fig. 10.
Similar to the first embodiment, although the signal transmission method of one mobile station is described as an example in the present embodiment, in practical application, there may be k mobile stations related to the present embodiment, each mobile station adopts the same signal transmission method in the present embodiment, and as shown in fig. 11, signals of different mobile stations are distinguished by being mapped onto different time-frequency resources. Since each mobile station maps its own signal to a time-frequency resource different from that of other mobile stations, the set of interleavers of each mobile station may be the same as or different from those of other mobile stations.
In this embodiment, the DFT is first transformed and then OFDM is modulated, and OFDM modulation includes Inverse Discrete Fourier Transform (IDFT) (usually implemented by IFFT) transform), which is equivalent to transmitting data stream in time domain, so that Peak Average Power Ratio (PAPR) of transmitted synchronization sequence is reduced and transmission performance is improved.
A sixth embodiment of the present invention is directed to a wireless signal transmission method, which is substantially the same as the fifth embodiment except that in the fifth embodiment, each data stream is a different layer data stream of the same mobile station, and therefore, the mobile station can superimpose the encoded and interleaved data streams into one signal, and transmit the data streams on the same time-frequency resource after DFT conversion. In the present embodiment, each data stream is a data stream of a different mobile station, as shown in fig. 12. The interleaver of each mobile station is an interleaver with different interleaving rules, the interleaver group is used for distinguishing the data streams of different mobile stations, each mobile station modulates the interleaved data stream of the mobile station on the same time-frequency resource in an OFDM mode after DFT conversion, and transmits each path of data stream on the same time-frequency resource. The receiving end can recover each path of data stream from the same time frequency resource according to different interleaving modes, thereby improving the frequency spectrum utilization rate of the system.
It should be noted that each mobile station shown in fig. 12 can be regarded as a group of mobile stations, and in practical application, a plurality of groups of such mobile stations may be included, and for each group, each mobile station is distinguished by an interleaver with a different rule in the group; the mobile stations in each group are distinguished by mapping to different time-frequency resources between groups, so that the interleavers in different groups can be the same or different.
A seventh embodiment of the present invention relates to a wireless signal transmission system, as shown in fig. 13, including: the N coding units are respectively used for carrying out redundancy coding on the N paths of data streams; n different interleavers, which are respectively used for interleaving the coding result output by each coding unit; and the transmitting unit is used for modulating the interleaving results output by the interleavers on the same time-frequency resources in an OFDM mode and transmitting the interleaving results. Wherein N is an integer greater than 1. By using different interleavers, multiple data streams can share the same time-frequency resource, and a receiving end can recover each data stream from the same time-frequency resource according to different interleaving modes, thereby improving the frequency spectrum utilization rate of the system.
Specifically, the coding unit includes a sub-unit for performing spread spectrum coding and/or a sub-unit for performing repetition coding. Through the spread spectrum coding subunit and/or the repeated coding subunit, one effective information bit can be expanded into a plurality of effective information bits, so that the coding redundancy is higher, on one hand, the probability of being correctly solved at a receiving end can be improved, and on the other hand, the higher redundancy enables a system to still have a lower error rate when the same time-frequency resources are multiplexed by multiple data streams.
The coding unit may further include a sub-unit for performing error correction coding, and the sub-unit for performing error correction coding on the data and outputting the data to the spread spectrum coding sub-unit and/or the repetition coding sub-unit. The information transmission rate is reduced, and the information transmission accuracy is improved by adding redundancy, so that the probability of correct solution at a receiving end is improved.
The interleaver may be formed by cascading at least two interleavers that are shorter than the interleaver. The method is easier to realize in hardware and has shorter processing time delay.
For the case that the N data streams are different layer data streams of the same mobile station, the transmitting unit comprises: the adder is used for superposing the interweaving results output by the interweavers into a path of signals; the mapping subunit is used for mapping the signal output by the adder to a time-frequency resource; and the modulation subunit is used for carrying out OFDM modulation on the output result of the mapping subunit and then transmitting the output result. The transmitting unit may further include a DFT sub-unit, configured to perform DFT on the signal output by the adder, and output the DFT to the mapping sub-unit, so as to reduce a PAPR of the transmit synchronization sequence.
For the case where the N data streams are for N different mobile stations, there are N transmit units, and each mobile station includes a coding unit, an interleaver, and a transmit unit. The transmitting unit includes: a mapping subunit and a modulation subunit. The mapping subunit is used for mapping the signals output by the interleaver to time-frequency resources, wherein the mapping subunits in the N mobile stations map the signals to the same time-frequency resources; and the modulation subunit is used for carrying out OFDM modulation on the output result of the mapping subunit and then transmitting the output result. The transmitting unit may further include a DFT sub-unit for performing DFT conversion on the interleaving result from the interleaver and outputting the result to the mapping sub-unit, so as to reduce the PAPR of the transmitted synchronization sequence.
An eighth embodiment of the present invention relates to a wireless signal transmitting system, which includes K (K is an integer greater than or equal to 2) subsystems, each of which is the wireless signal transmitting system of the seventh embodiment, and different subsystems use different time-frequency resources. By combining Interleave Division Multiplexing (IDM) with OFDMA, the system has higher spectrum utilization ratio than both OFDMA system and IFDMA system.
A ninth embodiment of the present invention relates to a mobile station including: an encoding unit configured to perform redundancy encoding on a data stream; the interleaver is used for interleaving the coding result output by the coding unit; and the transmitting unit is used for modulating the interleaving result output by the interleaver on time-frequency resources shared with other mobile stations in an OFDM mode for transmitting.
Specifically, the coding unit includes a sub-unit for performing spread spectrum coding and/or a sub-unit for performing repetition coding. Through the spread spectrum coding subunit and/or the repeated coding subunit, one effective information bit can be expanded into a plurality of effective information bits, so that the coding redundancy is higher, on one hand, the probability of being correctly solved at a receiving end can be improved, and on the other hand, the higher redundancy enables a system to still have a lower error rate when the same time-frequency resources are multiplexed by multiple data streams. The coding unit may further include a sub-unit for performing error correction coding, and the sub-unit for performing error correction coding on the data and outputting the data to the spread spectrum coding sub-unit and/or the repetition coding sub-unit. The information transmission rate is reduced, and the information transmission accuracy is improved by adding redundancy, so that the probability of correct solution at a receiving end is improved. The interleaver may be formed by cascading at least two interleavers that are shorter than the interleaver. The method is easier to realize in hardware and has shorter processing time delay.
The transmitting unit includes: a mapping subunit and a modulation subunit. The mapping subunit is used for mapping the signal output by the interleaver to a time-frequency resource shared by other mobile stations; and the modulation subunit is used for carrying out OFDM modulation on the output result of the mapping subunit and then transmitting the output result. The transmitting unit may further include a DFT sub-unit for performing DFT conversion on the interleaving result from the interleaver and outputting the result to the mapping sub-unit, so as to reduce the PAPR of the transmitted synchronization sequence.
In summary, in the embodiments of the present invention, different interleavers are used, so that multiple data streams can share the same time-frequency resource, and a receiving end can recover each data stream from the same time-frequency resource according to different interleaving manners, thereby improving the spectrum utilization of the system.
The data stream is divided into a plurality of groups, different data streams on the same time frequency resource are distinguished in each group in different interleaving modes, and different groups use different time frequency resources. By combining IDM with OFDMA, there is a higher spectrum utilization than both OFDMA systems and IFDMA systems.
One effective information bit is expanded into a plurality of effective information bits through spread spectrum coding and/or repeated coding, the coding redundancy is high, on one hand, the probability of being correctly solved at a receiving end can be improved, and on the other hand, the high redundancy enables a system to have a low error rate when multiple paths of data streams multiplex the same time-frequency resources.
By error correction coding the data stream first, the probability of being correctly decoded at the receiving end can be improved.
The DFT conversion is performed before the OFDM modulation, and the OFDM modulation comprises IDFT conversion, which is equivalent to transmitting data stream in a time domain form, so that the peak-to-average ratio of a transmitted synchronization sequence is reduced, and the transmission performance is improved.
A plurality of shorter interleavers are cascaded into a longer interleaver, so that the hardware implementation is more convenient, and the processing time delay is shorter.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (19)
1. A method for transmitting wireless signals, comprising the steps of:
respectively carrying out redundancy coding on at least two paths of data streams, wherein each path of data stream is a different layer of data stream of the same mobile station;
respectively interleaving the coding result of each path by using different interleavers;
modulating each path of interleaving result on the same time frequency resource in an Orthogonal Frequency Division Multiplexing (OFDM) mode for transmitting;
the modulating the interleaving results of each path on the same time frequency resource in an OFDM mode comprises the following steps: and superposing the interweaving results of the paths into a path of signal, mapping the path of signal to a time frequency resource, and transmitting after OFDM modulation.
2. Method for transmitting a radio signal according to claim 1, characterized in that said step of coding comprises the sub-step of performing spread spectrum coding and/or repetition coding.
3. The wireless signal transmission method according to claim 2, wherein in the coding step, before the sub-step of performing spread spectrum coding and/or repetition coding, the sub-step of performing error correction coding is further included.
4. The wireless signal transmission method according to claim 3, wherein in the step of encoding, after the sub-step of error correction encoding and before the sub-step of spread spectrum encoding and/or repetition encoding, further comprising the sub-step of converting serial data into parallel data;
alternatively, the encoding step may be preceded by a step of converting serial data into parallel data.
5. A method of transmitting wireless signals according to claim 1, characterized in that said step of coding comprises the sub-step of performing error correction coding.
6. The wireless signal transmission method according to claim 5, further comprising a step of converting serial data into parallel data after the step of encoding and before the step of interleaving; or,
after the encoding step and before the interleaving step, the method further comprises the steps of converting serial data into parallel data and encoding the converted parallel data.
7. The method of claim 1, wherein the step of modulating the interleaving results of each channel on the same time-frequency resource in an Orthogonal Frequency Division Multiplexing (OFDM) manner comprises the following steps:
and carrying out Discrete Fourier Transform (DFT) on the interleaving result, and modulating each path of interleaving result after DFT conversion on the same time-frequency resource in an Orthogonal Frequency Division Multiplexing (OFDM) mode for transmission.
8. The method of claim 1, wherein the interleaver is formed by cascading at least two interleavers shorter than the interleaver.
9. A wireless signal transmission system, comprising:
n coding units, which are respectively used for carrying out redundancy coding on N data streams, wherein the N data streams are different layer data streams of the same mobile station;
n different interleavers, which are respectively used for interleaving the coding result output by each coding unit;
a transmitting unit, configured to modulate the interleaving result output by each interleaver in an OFDM manner on the same time-frequency resource for transmission, where the transmitting unit includes:
the adder is used for superposing the interleaving results output by the interleavers into a path of signal;
a mapping subunit, configured to map the signal output by the adder to a time-frequency resource;
the modulation subunit is used for carrying out OFDM modulation on the output result of the mapping subunit and then transmitting the output result;
wherein N is an integer greater than 1.
10. The wireless signal transmission system of claim 9, wherein the coding unit comprises a sub-unit for performing spread spectrum coding and/or a sub-unit for performing repetition coding;
the coding unit also comprises a sub-unit for error correction coding, and the sub-unit is used for outputting the data after error correction coding to the sub-unit for spread spectrum coding and/or the sub-unit for repeated coding.
11. The wireless signal transmission system of claim 9, wherein the interleaver is formed by cascading at least two interleavers shorter than the interleaver.
12. The wireless signal transmission system according to claim 9, wherein the transmitting unit further includes a DFT sub-unit, configured to perform DFT conversion on the signal output by the adder and output the DFT converted signal to the mapping sub-unit.
13. A mobile station, comprising:
a coding unit, configured to perform redundancy coding on at least two data streams, where each data stream is a different layer data stream of the mobile station;
the interleaver is used for interleaving the coding result output by the coding unit;
a transmitting unit, configured to modulate the interleaving result output by the interleaver in an OFDM manner on a time-frequency resource shared with other mobile stations, and transmit the result, including: and superposing the interleaving results of all paths into a path of signal, mapping the signal to a time frequency resource, and transmitting after OFDM modulation.
14. The mobile station of claim 13, wherein the coding unit comprises a sub-unit for performing spreading coding and/or a sub-unit for performing repetition coding;
the coding unit also comprises a sub-unit for error correction coding, and the sub-unit is used for outputting the data after error correction coding to the sub-unit for spread spectrum coding and/or the sub-unit for repeated coding.
15. The mobile station according to claim 13 or 14, wherein the transmitting unit comprises:
a mapping subunit, configured to map the signal output by the interleaver to a time-frequency resource shared with other mobile stations;
and the modulation subunit is used for carrying out OFDM modulation on the output result of the mapping subunit and then transmitting the output result.
16. The mobile station of claim 15, further comprising a DFT unit configured to perform DFT on the interleaving result from the interleaver and output the DFT result to the mapping sub-unit.
17. A method for transmitting radio signals, characterized in that the method of any one of claims 1 to 8 is used to transmit each of K data stream groups, wherein different time-frequency resources are used for different data stream groups, K is an integer greater than or equal to 2, and each data stream group comprises at least two data streams.
18. The method of claim 17, wherein different groups of data streams belong to different mobile stations, and wherein data streams in a same group of data streams belong to a same mobile station; or,
different data streams in different data stream groups belong to different mobile stations, respectively.
19. A wireless signal transmission system, comprising K subsystems, each subsystem being the wireless signal transmission system according to any one of claims 9 to 11, wherein different subsystems use different time-frequency resources, and K is an integer greater than or equal to 2.
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| US9154363B2 (en) * | 2011-05-13 | 2015-10-06 | Qualcomm Incorporated | Systems and methods for wireless communication of packets having a plurality of formats |
| CN102684840B (en) * | 2012-05-29 | 2014-12-24 | 上海交通大学 | Novel coding modulation method and device for low-density parity check code |
| WO2014110812A1 (en) * | 2013-01-18 | 2014-07-24 | 华为技术有限公司 | Information transmission method and device |
| CN103973395A (en) * | 2013-01-28 | 2014-08-06 | 华为技术有限公司 | Data processing method, device and system in wireless communication |
| CN104811410B (en) * | 2014-01-26 | 2018-05-04 | 上海数字电视国家工程研究中心有限公司 | Construction method, sending method and the demodulation method of physical frame |
| CN105262559A (en) * | 2014-07-15 | 2016-01-20 | 中国移动通信集团公司 | Data sending method, data receiving method and related device |
| CN108432168B (en) * | 2016-06-14 | 2020-11-03 | 华为技术有限公司 | Method and equipment for demodulation and decoding |
| CN108306707B (en) * | 2017-01-12 | 2024-02-20 | 中兴通讯股份有限公司 | Method, device and communication system for multiple access |
| CN113556206B (en) * | 2020-04-22 | 2023-10-10 | 广州海格通信集团股份有限公司 | Anti-interference communication system, method, computer device and storage medium |
| CN114598419B (en) * | 2021-11-12 | 2023-08-01 | 北京智芯微电子科技有限公司 | Interleaver, deinterleaver, and methods of performing the same |
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