CN101150555A - Coding method and device and decoding method and device - Google Patents
Coding method and device and decoding method and device Download PDFInfo
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Abstract
The invention discloses a coding method based on a frequency diversity coding orthogonal frequency division multiplexing superwide band system, the method comprises: modulating input data and space-time block coding the modulated data, then mapping the coded data, mapping coded data corresponding to each subband to corresponding subcarriers in different orthogonal frequency division multiplexing symbols, or mapping coded data corresponding to each subband to corresponding subcarriers in one orthogonal frequency division multiplexing symbol. According to the coding method, the invention also provides a coding device, a coding method and a decoding device. The invention can make the system transmit data with a higher speed, also can guarantee the system obtain higher diversity gain. Moreover, the decoding complexity of the invention is lower, while the decoding accuracy is higher, thereby performance of the system is improved.
Description
Technical Field
The present invention relates to an orthogonal frequency division multiplexing ultra-wideband system in the field of wireless communication, and more particularly, to a method and an apparatus for encoding and decoding frequency diversity codes.
Background
Due to the limitation of spectrum planning, the transmission power spectrum of the ultra-wideband signal must be smaller than a certain threshold value, and at present, a multi-Band Orthogonal Frequency Division multiplexing (MB-OFDM) scheme is adopted to spread the spectrum, but the MB-OFDM scheme requires fast and accurate Frequency synchronization, which puts a very high requirement on the front end of the receiver, and the fluctuation of the instantaneous power spectrum of the scheme is large, which may exceed the specified spectrum limit.
In order to solve the problems of the MB-OFDM scheme, a frequency diversity code orthogonal frequency division multiplexing ultra-wideband system is provided, assuming that the system utilizes M sub-bands, in each sub-band, K sub-carrier data are transmitted in each symbol period, and M x K code words are generated after frequency domain diversity coding, and this process can be regarded as synthesizing a large OFDM signal by M x K sub-carriers, and then transmitting the OFDM signal after fast inverse Fourier transform (IFFT). At the receiving end, the frequency domain received signal obtained by performing rate-reduction sampling and Fast Fourier Transform (FFT) on the received signal is:
k =0,1,. K-1, wherein,
the channel gain for the ith subband. As can be seen from this equation, the received signal on the k-th subcarrier is obtained by mixing and superimposing the corresponding k-th subcarrier data on the M subbands, and thus the frequency diversity code orthogonal frequency division multiplexing ultra wideband system can be equivalent to a multi-input single-output system having M transmit antennas and 1 receive antenna, and thus the diversity gain can be obtained by applying the space-time coding technique to the frequency diversity code orthogonal frequency division multiplexing ultra wideband system.
The prior art proposes a method for constructing a frequency diversity code based on Space Time Trellis Coding (STTC) based on a frequency diversity code orthogonal frequency division multiplexing ultra-wideband system,this prior art is implemented as follows: supposing that an ultra-wideband system has M sub-bands, the modulation mode is Phase Shift Keying (PSK), an encoder consists of v registers, and the adopted modulation order M =2 v The input to the encoder at time k is one bit C K The output of the encoder can be expressed as:i =0, 1.., M-1, wherein g i，j The element is e {0, 1.., M-1}, and g can be described by a matrix i，j And the M outputs of the encoder are signal points in a PSK constellation set and are respectively modulated onto subcarriers of M subbands.
Wherein, g is i，j Different values of each element in the matrix obtained by the coefficient can correspond to different mapping modes, namely encoders with different performances, and the prior art can optimize g i，j The coefficient obtaining matrix enables the system to obtain coding gain on the premise of meeting diversity gain.
However, each trellis state transition in the above prior art only contains one bit of information, so that the rate of frequency diversity coding is low, which limits the high-rate data transmission of the system, and at the same time, the number of states of the encoder is at least equal to the modulation order, and if the number of states increases, the number of shift registers in the encoder will increase, so that the complexity of decoding the maximum likelihood sequence also increases exponentially. Therefore, the prior art based on the space-time trellis code has the disadvantages of low code rate and high decoding complexity.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a coding method and a device and a decoding method and a device based on a frequency diversity coding orthogonal frequency division multiplexing ultra-wideband system, wherein the coding method and the device can obtain higher diversity gain while ensuring high-rate data transmission.
In order to solve the above technical problem, the present invention provides an encoding method, including:
modulating input data, performing space-time block coding on the data generated by modulation, mapping the data generated by coding, and mapping the coded data corresponding to each sub-band to corresponding sub-carriers in different orthogonal frequency division multiplexing symbols, or mapping the coded data corresponding to each sub-band to corresponding sub-carriers in the same orthogonal frequency division multiplexing symbol.
According to the above coding method, the present invention also provides a coding apparatus, which includes a modulation unit, and in addition, the apparatus further includes:
a space-time coding unit for performing space-time block coding on the data generated by the modulation unit;
and the mapping unit is used for mapping the data generated by the space-time coding unit, and mapping the coded data corresponding to each sub-band to corresponding sub-carriers in different orthogonal frequency division multiplexing symbols, or mapping the coded data corresponding to each sub-band to corresponding sub-carriers in the same orthogonal frequency division multiplexing symbol.
According to the encoding method, the present invention also provides a decoding method, including:
grouping data on the same subcarrier in different received orthogonal frequency division multiplexing symbols, or grouping subcarrier data in the same received orthogonal frequency division multiplexing symbol;
and calculating to obtain a decision signal according to the packet data and the estimated value of the channel, and then decoding the decision signal to obtain the estimated value of the input data during space-time coding.
Optionally, calculating the decision signal comprises:
and calculating to obtain a conjugate transpose matrix of the channel estimation value, and multiplying the packet data by the conjugate transpose matrix of the channel estimation value to obtain a decision signal.
Optionally, when a parallel interference cancellation detection mode is adopted, decoding the decision signal to obtain an estimated value of the input data when space-time coding is performed includes:
carrying out hard decision on the generated decision signal, and obtaining interference information among subcarriers according to the signal generated by the hard decision;
and canceling the interference information and the interference information of the decision signal to obtain an estimated value of input data during space-time coding.
Optionally, when a serial interference cancellation detection mode is adopted, decoding the decision signal to obtain an estimated value of input data during space-time coding includes:
comparing the signal-to-noise ratio of the decision signal, carrying out hard decision on the data with larger signal-to-noise ratio, and obtaining interference information among the sub-carriers according to the signal generated by the hard decision;
eliminating the interference information from the judgment signal with smaller signal-to-noise ratio to obtain the estimation value of the input data of the judgment signal during space-time coding;
and carrying out hard decision on the estimated value of the input data, obtaining interference information between subcarriers according to a signal generated by the hard decision, eliminating the interference information from a decision signal with a larger signal-to-noise ratio, and obtaining the estimated value of the input data of the decision signal during space-time coding.
According to the decoding method, the present invention further provides a decoding apparatus, which includes a channel estimation unit, and further includes:
the de-mapping unit is used for grouping the data on the same subcarrier in different received orthogonal frequency division multiplexing symbols or grouping the subcarrier data in the same received orthogonal frequency division multiplexing symbol;
the signal generating unit is used for calculating to obtain a decision signal according to the channel estimation value obtained by the channel estimation unit and the grouped data generated by the demapping unit;
and the decoding unit is used for decoding the decision signal to obtain an estimated value of the input data during space-time coding.
Optionally, the decoding unit is a parallel interference cancellation detector or a serial interference cancellation detector.
The above technical solutions show that the encoding method and apparatus and the decoding method and apparatus provided by the present invention have the following beneficial effects:
firstly, the Coding method of the invention constructs the frequency diversity code by Space Time Block Coding (STBC), and then maps the data generated by Coding to the corresponding subcarrier in different orthogonal frequency division multiplexing symbols or the corresponding subcarrier in the same orthogonal frequency division multiplexing symbol, compared with the information that each grid state conversion only comprises one bit in the prior art, the Coding method of the invention can enable the system to transmit data at a higher rate, and simultaneously, the sequence generated by the Space Time Block Coding has orthogonality, thereby enabling the system to obtain higher diversity gain.
In addition, because the decoding method of the invention carries out interference elimination on the generated decision signal and then obtains the estimated value of the input data during space-time coding, the interference information of the decision signal is reduced, thereby improving the accuracy of decoding and further improving the performance of the system.
Drawings
FIG. 1 is a flow chart of a first embodiment of the encoding method of the present invention;
FIG. 2 is a flowchart of a second embodiment of the encoding method of the present invention;
FIG. 3 is a schematic diagram of an embodiment of an encoding apparatus of the present invention;
FIG. 4 is a flow chart of an embodiment of a decoding method of the present invention;
FIG. 5 is a schematic diagram of a parallel interference cancellation detector of the decoding method of the present invention;
FIG. 6 is a schematic diagram of a successive interference cancellation detector of the decoding method of the present invention;
FIG. 7 is a schematic diagram of an embodiment of a decoding apparatus of the present invention;
figure 8 is a bit error rate diagram for several ultra-wideband systems.
Detailed Description
The invention provides a coding method, which modulates input data, performs space-time block coding on the modulated data, maps the coded data generated by coding, and maps the coded data corresponding to each sub-band to corresponding sub-carriers in different orthogonal frequency division multiplexing symbols, or maps the coded data corresponding to each sub-band to corresponding sub-carriers in the same orthogonal frequency division multiplexing symbol.
The following describes a specific technical solution of the encoding method of the present invention with reference to the accompanying drawings.
Embodiment of the coding method
Referring to fig. 1, fig. 1 is a flowchart of a first embodiment of an encoding method according to the present invention, which describes a frequency-time encoding method constructed by space-time block coding on the basis of a frequency diversity code orthogonal frequency division multiplexing ultra wideband system, and specifically includes the following steps:
step 101, modulating input data, and grouping data generated by modulation. Assuming that a system inputs 4K bits, performs Quadrature Phase Shift Keying (QPSK) modulation to generate 2K QPSK symbols, and then groups the QPSK symbols according to a matrix generated by space-time coding, for example, the number of subbands is 2, and divides two symbols into one group; the number of subbands is 3 or 4, and 4 symbols are divided into a group; with a subband number of 5, 8 symbols are grouped into a group, and so on.
And 102, performing space-time block coding on all the grouped data, dividing the data generated by coding into multiple paths of data according to the number of the sub-bands to obtain the data which needs to be sent out by each sub-band, wherein the data sent by different sub-bands have orthogonality. Wherein each subband includes a plurality of subcarriers.
And 103, mapping the data generated by coding, and mapping the coded data corresponding to each sub-band to corresponding sub-carriers in different OFDM symbols, so as to obtain the data which needs to be transmitted by each sub-band at each moment.
The following describes the mapping process of data by taking two subbands as an example, and S is assumed K 、-S * k+1 Is the encoded data, S, corresponding to subband 1 k+1 、S * k Is the coded data corresponding to subband 2, and transmits S on subcarrier k of subband 1 in the t-th OFDM symbol period K transmitting-S on sub-carrier k of sub-band 1 in t +1 th OFDM symbol period * k+1 For subband 2, subcarrier k transmits S in the t-th OFDM symbol period k+1 The transmission on subcarrier k of the t +1 th OFDM symbol period is S * k And the data transmitted by the two sub-bands have orthogonality.
As can be seen from the above, the whole encoding process is performed between two consecutive OFDM symbols, so that the data transmitted on each subcarrier in the first symbol period needs to be buffered, and then the processed data is transmitted in the second symbol period.
Second embodiment of the encoding method
Referring to fig. 2, fig. 2 is a flowchart of a second embodiment of the encoding method of the present invention, which describes a frequency-frequency encoding method constructed by space-time block coding on the basis of a frequency diversity code orthogonal frequency division multiplexing ultra wideband system, and specifically includes the following steps:
step 201, modulating the input data, and grouping the data generated by modulation. Supposing that 4K bits are input by a system, 2K QPSK symbols are generated after QPSK modulation, and then the QPSK symbols are grouped according to a matrix generated by space-time coding, for example, the number of subbands is 2, and the two symbols are divided into one group; the number of subbands is 3 or 4, and 4 symbols are divided into a group; with a subband number of 5, 8 symbols are grouped into a group, and so on.
Step 202, performing space-time block coding on all the packet data, and dividing the data generated by coding into multiple paths of data according to the number of sub-bands to obtain the data to be sent out by each sub-band, wherein the data sent by different sub-bands have orthogonality.
Step 203, mapping the data generated by coding, and mapping the coded data corresponding to each sub-band to the corresponding sub-carrier in the same orthogonal frequency division multiplexing symbol, thereby obtaining the data that each sub-band needs to send in each symbol.
The mapping process is described below by taking two subbands as an example, and S is assumed K 、-S * k+1 Is subband 1Corresponding encoded data, S k+1 、S * k Is the coded data corresponding to subband 2, and during the t-th OFDM symbol period, the k-th subcarrier on subband 1 transmits S K transmitting-S on the k +1 th subcarrier * k+1 (ii) a For subband 2, during the t-th OFDM symbol period, the k-th subcarrier transmits S k+1 Transmitting S on the k +1 th subcarrier * k And the data transmitted by the two sub-bands have orthogonality. As can be seen from the above, the whole mapping process is performed in the same OFDM symbol period, so the system does not need to perform any processing on the data.
Coding apparatus embodiment
According to the above coding method, the present invention further provides a coding apparatus, and referring to fig. 3, fig. 3 is a schematic diagram of an embodiment of the coding apparatus of the present invention, where the coding apparatus includes a modulation unit 301, a space-time coding unit 302, and a mapping unit 303.
The space-time coding unit 302 is configured to group the data generated by the modulation unit 301, perform space-time coding on the grouped data, and divide the data generated by coding into multiple paths of data according to the number of subbands to obtain data that needs to be sent out for each subband, where orthogonality exists between the data sent by different subbands.
The mapping unit 303 is configured to map the data generated by the space-time coding unit 302, map the coded data corresponding to each subband to corresponding subcarriers in different OFDM symbols, or map the coded data corresponding to each subband to corresponding subcarriers in the same OFDM symbol, so as to obtain data that needs to be sent in each symbol period for each subband.
The present invention also provides a corresponding decoding method for the above-described encoding method, and the following describes the decoding techniques for the frequency-time encoding mode and the frequency-frequency encoding mode respectively.
Embodiment of the decoding method
Decoding procedure for frequency-time coding mode
At the receiving end, the decoding of the frequency-time coding mode is that firstly, the data on the same subcarrier in different received orthogonal frequency division multiplexing symbols are grouped, then the decision signal is obtained by calculation according to the grouped data and the estimated value of the channel, and then the decision signal is decoded to obtain the estimated value of the input data during the space-time coding. Meanwhile, the channel of the ultra-wideband system is a quasi-static multipath channel, so that the requirement that the channel of the code is unchanged in a plurality of symbol periods is met, therefore, the decoding of the frequency-time coding mode is similar to that of a common multi-input multi-output-orthogonal frequency division multiplexing system, any decoding mode is applicable, and the frequency-time coding mode is usually decoded by adopting a maximum likelihood algorithm.
Embodiment two of the decoding method
Decoding process for frequency-frequency coding mode
At the receiving end, the decoding of the frequency-frequency coding mode is performed in the same OFDM symbol period, and the decoding of the frequency-frequency coding mode is described below with reference to the accompanying drawings.
The invention provides a decoding method, which groups the subcarrier data in the same received orthogonal frequency division multiplexing symbol; and calculating to obtain a decision signal according to the packet data and the estimated value of the channel, and then decoding the decision signal to obtain the estimated value of the input data during space-time coding.
According to the above method concept, the technical solution of the decoding method of the present invention is described in detail with reference to the accompanying drawings, and fig. 4 is a flowchart of an embodiment of the decoding method of the present invention, which specifically includes the following steps:
Grouping the sub-carrier data in the same received orthogonal frequency division multiplexing symbol, and estimating the frequency response of the channel by the pilot frequency sequence, and assuming that the frequency responses of the channel on the k, k +1 sub-carriers of two sub-bands are respectively H k 0 ，H k+1 0 ，H k 1 ，H k+1 1 Wherein, the channel can be estimated by a channel estimation method such as maximum likelihood or least square.
Taking two subbands as an example, grouping the subcarriers of the received ofdm symbol two by two, where the received signals on the k, k +1 th subcarriers are:
wherein, N in the formula (1) k Additive noise, H, representing the k-th sub-carrier frequency point k i I ∈ {0,1} representsFrequency domain response of k sub-carrier frequency point on ith sub-band, S k ，S k+1 Representing space-time coded input data.
Then, equation (1) is written in the form of a matrix:
and step 402, calculating to obtain a decision signal according to the obtained channel estimation value and the packet data. The conjugate transpose matrix of the channel estimation value is calculated according to equation (3), which is as follows:
the decision signal y is obtained by multiplying the packet data r by the conjugate transpose matrix of the channel estimation value obtained by equation (3), and is specifically as follows:
and 403, decoding the decision signal to obtain an estimated value of input data during space-time coding.
The decoding method of this embodiment may eliminate the Interference caused by non-orthogonality between adjacent subcarriers by means of Parallel Interference Cancellation (PIC) or Serial Interference Cancellation (SIC) detection, so as to improve performance.
Referring to fig. 5, fig. 5 is a schematic diagram of a parallel interference cancellation detector of the decoding method of the present invention, and the following describes, with reference to fig. 5, the parallel interference cancellation detection method, which specifically includes: for decision signal Y k ，Y k+1 Making a hard decision and generating a signal based on the hard decision
And
obtaining cross-interference information between subcarriers 
Then eliminating the cross interference information caused by non-orthogonality between sub-carriers from the decision signal to obtain the estimated value of the input data in space-time coding 
The following description will be made by taking two subcarriers as an example to eliminate the serial interference, and assuming that the generated decision signal is Y 1 ＝c 1 s 1 +e 1 s 2 +n 1 ，Y 2 ＝c 2 s 2 +e 2 s 1 +n 2 Then according to the mapping mode of the modulation process of the transmitting terminal, making hard decision on the decision signal to generate data
The cross interference information and the noise interference information are ignored at this time. Obtaining cross interference information caused by non-orthogonality between two sub-carriers according to the information generated by judgment
Wherein e 1 ，e 2 Can be calculated by the formula (3). Then the cross interference information is processed
And a decision signal Y 1 、Y 2 The cross interference information in (1) is mutually counteracted to obtain an estimated value of input data in space-time coding, namely
Referring to fig. 6, fig. 6 is a schematic diagram of successive interference cancellation detection of the decoding method of the present invention, and the following describes the successive interference cancellation detection method with reference to fig. 6, where the method specifically includes: from the decision signal Y k ，Y k+1 One of the data with larger signal-to-noise ratio is selected, and Y is assumed to be k Then Y is mapped according to the modulation process of the transmitting end k Making a hard decision and generating a signal based on the hard decision
Obtaining cross-interference information between sub-carriers, e.g.
And then from the decision signal Y whose signal-to-noise ratio is small k+1 Eliminating cross interference information caused by non-orthogonality between sub-carriers to obtain estimated value of input data of the decision signal in space-time codingTo pair
Hard decision is made
Then according to
Obtaining cross-interference information between sub-carriers, e.g.From the decision signal Y k Eliminating cross interference information caused by non-orthogonality between subcarriers to obtain estimated value of input data of decision signal with large signal-to-noise ratio during space-time coding
As can be seen from the above, in the present embodiment, the decision signal is obtained by multiplying the packet data by the conjugate transpose matrix of the channel estimation value, and then the interference information caused by the non-orthogonality of the subcarriers is eliminated by the parallel interference elimination or serial interference elimination detection method, so as to obtain the estimated value of the input data of the space-time coding. In addition to this, the space-time coding can also be decoded by decision feedback decoding or zero-forcing decoding methods.
According to the above decoding method, the present invention further provides a decoding apparatus, referring to fig. 7, the apparatus includes a demapping unit 701, a channel estimation unit 702, a signal generation unit 703 and a decoding unit 704.
The demapping unit 701 is configured to group subcarrier data in the same received ofdm symbol, the channel estimating unit 702 is configured to estimate a channel according to the data received by the demapping unit 701, the signal generating unit 703 is configured to calculate a decision signal according to the channel estimation value obtained by the channel estimating unit 702 and the packet data generated by the demapping unit 701, and the decoding unit 704 is configured to decode the decision signal output by the signal generating unit 703 to obtain an estimation value of input data during space-time coding, where the decoding unit 704 may perform decoding processing on the decision signal by using a parallel interference cancellation detector or a serial interference cancellation detector.
The Bit Error Rate (BER) performance of several ultra wideband systems is compared with FIG. 8, and single band ultra wideband (SB-UWB, single band-ultra wideband band) is shown in FIG. 8The system, the multi-band Frequency-Frequency block coding ultra-wideband (MB-FF-UWB, multi-band Frequency-Frequency ultra wideband) system without interference detection, the multi-band Frequency-Frequency block coding parallel interference cancellation detection ultra-wideband (MB-FF-PIC-UWB, multi-band Frequency-Frequency parallel candidate interference ultra wideband) system, the multi-band Frequency-Frequency block coding serial interference cancellation detection ultra-wideband (MB-FF-SIC-UWB, multi-band Frequency-Frequency serial interference cancellation ultra wideband) system and the multi-band Frequency-time block coding ultra wideband (MB-FT-UWB), wherein the MB-FT-Frequency block coding ultra wideband (MB-FT-UWB) system has the best performance, and the error rate curve graph of the multi-band Frequency-Frequency block coding ultra wideband (MB-FT-UWB system has the requirement of 10 error rate -4 The time-to-time block coding has 2dB Signal-to-noise ratio (SNR) gain compared with SB-UWB, and can meet the orthogonality requirement of frequency-time block coding; the frequency domain fading flatness between the subcarriers of the MB-FF-UWB system is not as good as that of the time domain, the orthogonality is weakened, and the performance is more deteriorated when the signal-to-noise ratio is larger; the MB-FF-PIC-UWB system and the MB-FF-SIC-UWB system both adopt the interference elimination detection technology, the performances of the two systems are relatively close, the figure 8 shows that the situation that only two sub-bands are adopted, the advantages of the serial interference elimination detection technology are not fully exerted, and if more than two sub-bands are adopted to increase diversity gain, the advantages of the serial interference elimination detection technology are more obvious than that of the parallel interference elimination detection technology.
The encoding method and apparatus and the decoding method and apparatus provided by the present invention are described in detail above, and the principle and the implementation of the present invention are described herein by using specific examples, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and as described above, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method of encoding, the method comprising:
modulating input data, performing space-time block coding on the data generated by modulation, mapping the data generated by coding, and mapping the coded data corresponding to each sub-band to corresponding sub-carriers in different orthogonal frequency division multiplexing symbols, or mapping the coded data corresponding to each sub-band to corresponding sub-carriers in the same orthogonal frequency division multiplexing symbol.
2. An encoding apparatus applying the method of claim 1, the apparatus comprising a modulation unit, the apparatus further comprising:
the space-time coding unit is used for carrying out space-time block coding on the data generated by the modulation unit;
and the mapping unit is used for mapping the data generated by the space-time coding unit, and mapping the coded data corresponding to each subband to corresponding subcarriers in different orthogonal frequency division multiplexing symbols, or mapping the coded data corresponding to each subband to corresponding subcarriers in the same orthogonal frequency division multiplexing symbol.
3. A method of decoding, the method comprising:
grouping data on the same subcarrier in different received orthogonal frequency division multiplexing symbols, or grouping the subcarrier data in the same received orthogonal frequency division multiplexing symbol;
and calculating according to the grouped data and the estimated value of the channel to obtain a decision signal, and then decoding the decision signal to obtain the estimated value of the input data during space-time coding.
4. The decoding method of claim 3, wherein computing the decision signal comprises:
and calculating to obtain a conjugate transpose matrix of the channel estimation value, and multiplying the packet data by the conjugate transpose matrix of the channel estimation value to obtain a decision signal.
5. The decoding method as claimed in claim 3 or 4, wherein when the parallel interference cancellation detection scheme is adopted, the step of decoding the decision signal to obtain the estimated value of the input data during space-time coding comprises:
carrying out hard decision on the generated decision signal, and then obtaining interference information between subcarriers according to the signal generated by the hard decision;
and canceling the interference information and the interference information of the decision signal to obtain an estimated value of input data during space-time coding.
6. The decoding method as claimed in claim 3 or 4, wherein when the successive interference cancellation detection scheme is adopted, the step of decoding the decision signal to obtain the estimated value of the input data during space-time coding comprises:
comparing the signal-to-noise ratio of the decision signal, carrying out hard decision on the data with larger signal-to-noise ratio, and obtaining interference information among the sub-carriers according to the signal generated by the hard decision;
eliminating the interference information from the decision signal with smaller signal-to-noise ratio to obtain the estimated value of the input data of the decision signal during space-time coding:
and carrying out hard decision on the estimated value of the input data, obtaining interference information between subcarriers according to a signal generated by the hard decision, eliminating the interference information from a decision signal with a larger signal-to-noise ratio, and obtaining the estimated value of the input data of the decision signal during space-time coding.
7. A decoding device to which the method of claim 3 is applied, the device comprising a channel estimation unit, characterized in that the device further comprises:
the demapping unit is used for grouping the data on the same subcarrier in the received different orthogonal frequency division multiplexing symbols or grouping the subcarrier data in the same orthogonal frequency division multiplexing symbol;
the signal generating unit is used for calculating to obtain a decision signal according to the channel estimation value obtained by the channel estimation unit and the packet data generated by the demapping unit;
and the decoding unit is used for decoding the decision signal to obtain an estimated value of the input data during space-time coding.
8. The decoding apparatus of claim 7, wherein the decoding unit is a parallel interference cancellation detector or a serial interference cancellation detector.
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| CN102164024B (en) * | 2011-04-14 | 2014-01-08 | 浪潮(北京)电子信息产业有限公司 | Serial bus data transmission method and device |
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