CN101425872B - Power control method, power control device - Google Patents

Power control method, power control device Download PDF

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CN101425872B
CN101425872B CN2007101682421A CN200710168242A CN101425872B CN 101425872 B CN101425872 B CN 101425872B CN 2007101682421 A CN2007101682421 A CN 2007101682421A CN 200710168242 A CN200710168242 A CN 200710168242A CN 101425872 B CN101425872 B CN 101425872B
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bit
several part
coded
part coded
transmitting power
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CN101425872A (en
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张璇
徐鹰
邱玲
朱近康
唐臻飞
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University of Science and Technology of China USTC
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention relates to a power control method and a power control device and a transmission device, wherein the power control method comprises the steps as follows: coding bits of each part encoded by low-density parity check codes are received; the coding bits of each part are assigned according to the column weights of a check matrix of the generated coding bit; the column weights corresponding to the coding bits of each part can be acquired; and corresponding transmission power can be assigned to the coding bits of each part on different column weights. The embodiment of the invention can increase the decoding performance of LDPC, reduce the BER thereof and enhance the BER performance, and is suitable for both a single receiving/transmitting system and a MIMO system.

Description

Poewr control method and output control device
Technical field
The present invention relates to the communication technology, especially a kind of Poewr control method and output control device.
Background technology
Vertically-(Vertical Bell laboratory layering space-time during dblast, hereinafter to be referred as: V-BLAST) technology is leading multiple-input and multiple-output (the Multiple InputMultiple Output in mobile communication aspect, hereinafter to be referred as: MIMO) application technology, because it can effectively improve the transmission of radio links speed and the availability of frequency spectrum of communication system, continuous elevator system capacity becomes the technology of present moving communicating field broad research.
Low density parity check code (Low Density Parity Check, hereinafter to be referred as: LDPC) be a kind of linear packeting error-correcting code that can define with unusual sparse parity matrix, has lower mistake flat bed characteristic, can realize parallel work-flow completely, no error code platform, average error rate (bit error rate, hereinafter to be referred as: BER) all be lower than Turbo code with decoding complexity, throughput is big, have the high-speed coding potentiality, very possible replace Turbo code and become more than the third generation (beyond 3generation, hereinafter to be referred as: B3G) the first-selected coding method of communication system has become one of research focus of current field of channel coding.
In V-BLAST and communication system that the LDPC technology combines, many antenna detection technology of V-BLAST receiving terminal is combined with the LDPC technology, by the methods such as mutual and iteration of soft information, can effectively improve the BER performance of system.
In independent mimo system, because the fading factor difference of Technique of Wireless MIMO Channel, and factor such as many interference between antennas, under the certain condition of gross power, transmitting terminal can be according to the feedback information of receiving terminal, adjust the power division between the many antennas of transmitting terminal, thereby improve the BER performance of MIMO communication system.
In codeless mimo system, it mainly is to be determined by the performance that the poorest son flows that receiving terminal detects the average BER performance that obtains.The poorest sub-flow restriction the average BER performance of mimo system, can reduce the influence of error propagation in many antenna detection by improvement to the poorest son stream, therefore, power control mainly is to improve the BER performance by the performance of improving the poorest son stream.
In the prior art, can carry out least mean-square error ordering interference cancellation (the Minimum Mean Squared Error-Ordered Successive InterferenceCancellation of power control according to transmitting terminal, hereinafter to be referred as: MMSE-OSIC) detection algorithm, calculate the transmitting power matrix of transmitting terminal, transmitting terminal adopts the control of this transmitting power matrix realization to each transmission antennas transmit power.With P I, eThe BER that represents the transmission stream that the i road is detected, and order P e , max = max 1 ≤ i ≤ M { P i , e } , The target of power control is: keeping by adjusting the transmitted power of transmitting terminal multiple transmit antennas, minimizing P under the constant situation of the rate of information throughput and the total transmitting power of transmitting terminal E, maxTo reduce average BER.Average BER gets arithmetic average to all son stream BER: P ‾ e = ( 1 / M ) Σ i = 1 M P i , e . According to the MMSE-OSIC detection algorithm, the transmitting power P=[P on the multiple transmit antennas 1, P 2..., P M] satisfy: P i = P t λ i Σ i = 1 M λ i The time, P E, maxMinimum.
I=1 wherein, 2 ..., M, M are the quantity of transmitting antenna, λ iBe the signal to noise ratio parameter of each transmitting antenna, P tTotal transmitting power for transmitting terminal.
After receiving terminal calculates P, it is fed back to transmitting terminal, transmitting terminal is adjusted the transmitting power of signal on many antennas in view of the above, thereby optimizes BER.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Above-mentioned power controlling is only applicable to codeless mimo system with the method for optimizing BER, does not consider the encoding and decoding characteristics of LDPC, is not suitable for the communication system that adopts the LDPC technology.
Summary of the invention
Embodiment of the invention technical problem to be solved is: according to the encoding and decoding characteristics of LDPC, a kind of power control techniques that is applicable to the communication system that adopts the LDPC technology is provided, thereby minimize the BER of the communication system of this employing LDPC technology, improve the decoding performance of LDPC, reduce its BER, improve its BER performance.
According to an aspect of the embodiment of the invention, a kind of Poewr control method that provides comprises:
Reception is with the each several part coded-bit of low density parity check code coding, and described each several part coded-bit distributes according to the column weight of the check matrix that generates described coded-bit;
Obtain the column weight of the correspondence of described each several part coded-bit;
Described each several part coded-bit to different column weights distributes corresponding transmission power.
According to another aspect of the embodiment of the invention, a kind of output control device that provides comprises:
Receiver module is used to receive the each several part coded-bit with the low density parity check code coding, and described each several part coded-bit distributes according to the column weight of the check matrix that generates described coded-bit;
Acquisition module is used for obtaining from described each several part coded-bit the column weight of each several part coded-bit correspondence;
First computing module is used for calculating the transmitting power ratio that sends described each several part coded-bit according to described column weight;
Second computing module is used for calculating the transmitting power that sends described each several part coded-bit according to described transmitting power ratio and total transmitting power;
Control module is used to control the corresponding transmitting power that calculates with described second computing module and sends described each several part coded-bit.
The embodiment of the invention is based on the encoding and decoding characteristics of LDPC, the column weight number of packets of coded-bit according to check matrix sent, at the column weight of receiving terminal according to check matrix, each several part coded-bit to each column weight correspondence distributes corresponding transmission power, thereby improve the decoding performance of LDPC, reduce its BER, improve its BER performance, be not only applicable to independent LDPC Single-Input Single-Output system, be applicable to the LDPC-MIMO communication system of LDPC technology and MIMO technology be combined into yet.
Below by drawings and Examples, the technical scheme of the embodiment of the invention is described in further detail.
Description of drawings
Fig. 1 is the flow chart of Poewr control method embodiment of the present invention.
Fig. 2 generates the flow chart of the each several part coded-bit embodiment that encodes with LDPC for the present invention.
The concrete exemplary plot of Fig. 3 for concerning between transmit power allocations ratio of the present invention and the BER.
Fig. 4 another concrete exemplary plot for concerning between transmit power allocations ratio of the present invention and the BER.
Fig. 5 is the structural representation of output control device embodiment of the present invention.
Fig. 6 is the structural representation of dispensing device embodiment of the present invention.
Embodiment
In the embodiment of the invention, the column weight of the check matrix that will be with the coded-bit of LDPC coding adopts during according to coding is divided into many parts coded-bit, send by one or more transmitting antennas, after receiving the each several part coded-bit, distribute corresponding transmission power to it according to the different column weights of part coded-bit correspondence; When launching the different piece coded-bit respectively, except the column weight of each several part coded-bit correspondence, also distribute corresponding transmission power to the each several part coded-bit, thereby optimize BER in conjunction with the signal to noise ratio of each transmitting antenna by multiple transmit antennas.
As shown in Figure 1, be the flow chart of Poewr control method embodiment of the present invention, it may further comprise the steps:
Step 101, receiving terminal receives the each several part coded-bit with the LDPC coding, and this each several part coded-bit distributes according to the column weight of the check matrix H that generates coded-bit.Receiving terminal wherein specifically can be a terminal.
Step 102, receiving terminal are obtained the column weight of the correspondence of each several part coded-bit.
Step 103, receiving terminal are calculated the transmitting power ratio that sends the each several part coded-bit according to each column weight.
Step 104, receiving terminal calculates the transmitting power that sends the each several part coded-bit and sends to transmitting terminal according to transmitting power ratio and total transmitting power.Transmitting terminal wherein specifically can be the base station.
Step 105, transmitting terminal control transmitting antenna sends the each several part coded-bit with the corresponding transmitting power that receiving terminal calculates.
Encoding and decoding characteristics according to LDPC, send the transmitting power ratio of the each several part coded-bit corresponding with each column weight according to the column weight ratio calculation of check matrix, gross power control according to this transmitting power ratio and transmitting terminal sends the each several part coded-bit, thereby can improve the decoding performance of LDPC, reduce its BER, improve its BER performance.
Need to prove, in the step 103, after receiving terminal calculates the transmitting power ratio that sends the each several part coded-bit, also this transmitting power ratio can be sent to transmitting terminal, in the step 104, according to transmitting power ratio and total transmitting power, calculate the transmitting power that sends the each several part coded-bit by transmitting terminal.Before step 101, comprise that also transmitting terminal generates the flow process with the each several part coded-bit of LDPC coding, as shown in Figure 2, be the flow chart of the present invention's generation with the each several part coded-bit embodiment of LDPC coding, it may further comprise the steps:
Step 201, transmitting terminal adopt LDPC that the information bit of data to be sent is encoded according to the generator matrix G corresponding with check matrix H, generate coded-bit.
Check matrix H is the part of LDPC, its row corresponding the information bit in the sequences of code bits, capable then corresponding all check equations, element 1 has been represented the restriction relation between information bit and the check equations, for example h I, jI bit of=1 expression participated in j check equations.Obviously, the check equations number that some information bits participate in is many more, when then decoding, just can obtain more relevant information by this information bit, thereby with regard to easier being correctly decoded, and the number of the check equations that some information bits participates in promptly is this information bit corresponding number of 1 that lists in check matrix H.
In the check matrix H of irregular LDPC; the number of the element 1 that is comprised in the different lines is inequality; easier being correctly decoded of information bit of the row correspondence that the information bit of the row correspondence that containing element 1 is more obviously lacks than containing element 1, this phenomenon is called " the inhomogeneous protectiveness of the bit of irregular LDPC ".Column weight is the topmost factors of the different information bit decoding correctness of influence.
Step 202, transmitting terminal divides into groups to coded-bit according to the column weight of test matrix H, obtains the each several part coded-bit.
Step 203, transmitting terminal sends the each several part coded-bit.
In the step 203, can send the each several part coded-bit by the same antenna, one or more transmitting antennas that also can respectively each the part coded-bit in the each several part coded-bit be assigned in the mimo system send.Suppose to have three part coded-bits, send by three transmitting antennas, the one or more transmitting antennas that then each part coded-bit can be distributed to respectively in this three transmit antennas send, also the each several part coded-bit can be distributed to this three antennas respectively, be sent respectively by these three transmitting antennas.
The inventor is by discovering: when the transmit power allocations ratio between the different column weights satisfied certain proportion and concerns, the BER performance of irregular LDPC was the highest.
Particularly, send the each several part coded-bit or when each the part coded-bit in the each several part coded-bit is assigned randomly to one or more transmitting antennas in the mimo system and sends, in the step 103, can pass through formula by the same antenna P r : P s = Q s : Q r Calculate the transmitting power ratio that sends the each several part coded-bit, wherein, P r, P sFor sending the transmitting power of r, s part coded-bit,
Figure S2007101682421D00062
Figure S2007101682421D00063
Be respectively the column weight of r, s part coded-bit correspondence, Q s > Q r , R, s=1,2 ..., k, r ≠ s, k are the grouping number of described coded-bit.
With the check matrix H that two kinds of column weight distribution are arranged is example, is 1 and 3 to column weight respectively, and column weight is two kinds of situations of 2 and 4, as shown in Figure 3, under Gaussian channel, transmit power allocations ratio, that is: a concrete exemplary plot that concerns between column weight ratio and the BER, in this example, the column weight of check matrix H is 1 and 3, and code length is 1000, wherein 500 row column weights are 1,500 row column weights are 3, and code check is 1/2, and signal to noise ratio is 3.0.Among Fig. 3, abscissa is represented transmit power allocations ratio, that is: column weight ratio, and ordinate is represented BER.As shown in Figure 3, BER changes along with the variation of the column weight ratio that sends two parts coded-bit, and transmitting power and the column weight that when column weight is 1 coded-bit part is that the ratio of 3 coded-bit transmitting power partly is
Figure S2007101682421D00071
Perhaps approach
Figure S2007101682421D00072
The time, the BER of LDPC is minimum, its BER best performance.
As shown in Figure 4, under Gaussian channel, transmit power allocations ratio, that is: the concrete exemplary plot of another that concerns between column weight ratio and the BER, in this example, the column weight of check matrix H is 1 and 4, and code length is 1000, and wherein 500 row column weights are 1,500 row column weights are 4, and code check is 1/2, and signal to noise ratio is 3.0.Among Fig. 4, abscissa is represented transmit power allocations ratio, that is: column weight ratio, and ordinate is represented BER.As shown in Figure 4, BER changes along with the variation of the column weight ratio that sends two parts coded-bit, when column weight is that transmitting power and the column weight of 1 coded-bit part is that the ratio of 4 coded-bit transmitting power partly is 2 or when approaching 2, the BER of LDPC is minimum, its BER best performance.
By Fig. 3 and Fig. 4 as can be known, the error rate of information bit that column weight equals 1 row correspondence is higher, more difficult correction, and this will cause the decline of communication system overall performance.
Based on the fading characteristic of channel in the mimo system, in MIMO technology and communication system that the LDPC technology combines, the less transmitting antenna of can selecting to decline sends the less row corresponding codes bit part of column weight.In addition, also can increase the transmitted power of the transmitting antenna that sends the less row corresponding codes bit part of column weight, thereby reduce the BER of the less row corresponding codes bit of column weight.When the each several part coded-bit is sent by a plurality of different transmitting antennas respectively, can select the bigger transmitting antenna of signal to noise ratio to send the coded-bit of column weight smaller portions, the less transmitting antenna of signal to noise ratio sends the coded-bit of column weight major part.Accordingly, in the step 103, when calculating the transmitting power ratio that sends the each several part coded-bit, also need to detect the signal to noise ratio of each transmitting antenna, in conjunction with the signal to noise ratio parameter of column weight and each antenna of each several part coded-bit correspondence, come COMPREHENSIVE CALCULATING to send the transmitting power ratio of each several part coded-bit.Because the each several part coded-bit sends by a plurality of different transmitting antennas respectively, the transmitting power ratio of each several part coded-bit is the transmitting power ratio of each transmitting antenna that sends the each several part coded-bit.
Particularly, can pass through formula P r λ r : P s λ s = Q s : Q r Calculate the transmitting power ratio of the transmitting antenna that sends the each several part coded-bit, wherein, P r, P sFor sending the transmitting power of r, s part coded-bit,
Figure S2007101682421D00082
Be respectively the column weight of r, s part coded-bit correspondence, Q s > Q r , λ i, λ jBe respectively the signal to noise ratio parameter of the transmitting antenna that sends r, s part coded-bit, r, s=1,2 ..., k, r ≠ s, k are the grouping number of described coded-bit.Particularly, λ iCan be &sigma; 2 | | < G i &prime; > k i | | 2 + &Sigma; l &NotEqual; k i | ( < G i &prime; > k i [ H ] k &RightArrow; i - 1 ) 1 l | 2 | ( < G i &prime; > k i [ H ] k &RightArrow; i - 1 ) 1 k i | 2 , Wherein, H represents the channel matrix of MIMO, and G represents to have the MMSE transmitting power matrix under the power control, and G ' expression transmitting power matrix is a unit matrix, k iRepresent k iIndividual transmitting antenna, i are represented the detected transmission in i road stream, that is: i part coded-bit,＜ jThe j of representing matrix is capable, σ 2Be noise variance.
As shown in Figure 5, be the structural representation of output control device embodiment of the present invention, it can be used for realizing flow process as shown in Figure 1, and the output control device of this embodiment comprises and connecting successively:
Receiver module is used to receive the each several part coded-bit with the LDPC coding, and wherein, the each several part coded-bit distributes according to the column weight of the check matrix that generates described coded-bit;
Acquisition module is used for the column weight of the each several part coded-bit correspondence obtained from the each several part coded-bit that receiver module receives;
First computing module, each column weight that is used for getting access to according to acquisition module calculates the transmitting power ratio that sends the each several part coded-bit;
Second computing module is used for the transmitting power ratio that calculates according to first computing module and total transmitting power, calculates the transmitting power that sends the each several part coded-bit;
Control module is used to control the corresponding transmitting power corresponding with the each several part coded-bit that calculates with second computing module, sends the each several part coded-bit.
Wherein, first computing module can comprise:
Detecting unit is used to detect the signal to noise ratio of each transmitting antenna;
First computing unit is connected with acquisition module and computing module respectively, is used for according to each column weight and sends signal to noise ratio parameter with the transmitting antenna of the corresponding coded-bit of each column weight, the transmitting power ratio of the transmitting antenna of calculating transmission each several part coded-bit.
Further, control module can comprise:
Dispensing device is connected with receiver module, is used to generate and sends each several part coded-bit with the LDPC coding to receiver module;
Control unit, be connected with second computing module and dispensing device respectively, what each transmitting power that is used for calculating according to second computing module, control dispensing device calculated with second computing module sends the appropriate section coded-bit with each several part coded-bit corresponding transmission power.
As shown in Figure 6, be the structural representation of dispensing device embodiment of the present invention, it can be used for realizing flow process as shown in Figure 2, and the dispensing device of this embodiment comprises and connecting successively:
Coding module is used for according to the generator matrix G that sets in advance, and adopts LDPC that the information bit of data to be sent is encoded, and generates coded-bit;
Grouping module is used for the column weight according to the test matrix H corresponding with generator matrix G, and coded-bit is divided into groups, and obtains the each several part coded-bit, and wherein, generator matrix G and test matrix H satisfy: G * H=0;
Sending module is used for sending the each several part coded-bit to the receiver module of output control device.
In the foregoing description, sending module can comprise:
Allocation units are connected with grouping module, are used for the each several part coded-bit is distributed to one or more transmitting antennas respectively;
Transmitting antenna is used to send the coded-bit that is assigned with.The above-mentioned dispensing device of the embodiment of the invention can be used as dispensing device embodiment illustrated in fig. 5 and realizes corresponding function.
The embodiment of the invention is based on the encoding and decoding characteristics of LDPC, the column weight number of packets of coded-bit according to check matrix sent, send the transmitting power ratio of the each several part coded-bit corresponding with each column weight according to the column weight ratio calculation of check matrix at receiving terminal, gross power control according to this transmitting power ratio and transmitting terminal sends the each several part coded-bit, thereby improve the decoding performance of LDPC, reduce its BER, improve its BER performance, be not only applicable to independent LDPC Single-Input Single-Output system, be applicable to the LDPC-MIMO communication system of LDPC technology and MIMO technology be combined into yet.
It should be noted last that: above embodiment is only in order to illustrating technical scheme of the present invention, but not the present invention is made restrictive sense.Although the present invention is had been described in detail with reference to above-mentioned preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and this modification or be equal to the spirit and scope that replacement does not break away from technical solution of the present invention.

Claims (15)

1. a Poewr control method is characterized in that, comprising:
Reception is with the each several part coded-bit of low density parity check code coding, and described each several part coded-bit distributes according to the column weight of the check matrix that generates described coded-bit;
Obtain the column weight of the correspondence of described each several part coded-bit;
Described each several part coded-bit to different column weights distributes corresponding transmission power.
2. Poewr control method according to claim 1 is characterized in that, described described each several part coded-bit to different column weights distributes corresponding transmission power to comprise:
Calculate the transmitting power ratio that sends described each several part coded-bit according to described column weight;
Calculate the transmitting power that sends described each several part coded-bit according to described transmitting power ratio and total transmitting power;
Control sends described each several part coded-bit with the corresponding transmitting power that calculates.
3. Poewr control method according to claim 2 is characterized in that, also comprises:
According to the generator matrix corresponding with described check matrix, adopt low density parity check code that the information bit that sends data is encoded, generate described coded-bit;
According to the column weight of described check matrix, described coded-bit is divided into groups, obtain described each several part coded-bit;
Send described each several part coded-bit.
4. Poewr control method according to claim 3 is characterized in that, the described each several part coded-bit of described transmission is specially:
Send described each several part coded-bit by the same antenna.
5. Poewr control method according to claim 4 is characterized in that, calculates the transmitting power ratio that sends described each several part coded-bit according to described column weight and is specially:
Pass through formula
Figure RE-FSB00000427259700011
Calculate the transmitting power ratio that sends described each several part coded-bit, wherein, P R,P sFor sending the transmitting power of r, s part coded-bit,
Figure RE-FSB00000427259700012
Be respectively the column weight of r, s part coded-bit correspondence, R, s=1,2 ..., k, r ≠ s, k are the grouping number of described coded-bit.
6. Poewr control method according to claim 3 is characterized in that, the described each several part coded-bit of described transmission is specially:
Respectively each the part coded-bit in the described each several part coded-bit being assigned to one or more transmitting antennas sends.
7. Poewr control method according to claim 6 is characterized in that, describedly respectively each the part coded-bit in the described each several part coded-bit is assigned to one or more transmitting antennas and sends and be specially:
Described each several part coded-bit is sent by a plurality of different transmitting antennas respectively.
8. Poewr control method according to claim 7 is characterized in that, described each several part coded-bit is sent by a plurality of different transmitting antennas respectively be specially:
Select the bigger transmitting antenna of signal to noise ratio to send the coded-bit of column weight smaller portions.
9. according to claim 7 or 8 described Poewr control methods, it is characterized in that, calculate the transmitting power ratio that sends described each several part coded-bit according to described column weight and be specially:
The transmitting power ratio of the transmitting antenna that sends described each several part coded-bit according to the column weight and the signal to noise ratio calculation of parameter of described each several part coded-bit correspondence.
10. Poewr control method according to claim 9 is characterized in that, the transmitting power ratio that sends described each several part coded-bit according to the column weight and the signal to noise ratio calculation of parameter of described each several part coded-bit correspondence is specially:
Pass through formula
Figure RE-FSB00000427259700021
Calculate the transmitting power ratio of the transmitting antenna that sends described each several part coded-bit, wherein, P r, P sFor sending the transmitting power of r, s part coded-bit,
Figure RE-FSB00000427259700022
Figure RE-FSB00000427259700023
Be respectively the column weight of r, s part coded-bit correspondence, λ r, λ sBe respectively the signal to noise ratio parameter of the transmitting antenna that sends r, s part coded-bit, r, s=1,2 ..., k, r ≠ s, k are the grouping number of described coded-bit.
11. Poewr control method according to claim 10 is characterized in that, described control sends described each several part coded-bit with the corresponding transmitting power that calculates and is specially:
The transmitting antenna that control sends described each several part coded-bit sends described each several part coded-bit with the corresponding transmitting power that calculates.
12. Poewr control method according to claim 10 is characterized in that, also comprises:
Detect the signal to noise ratio of described transmitting antenna.
13. an output control device is characterized in that, comprising:
Receiver module is used to receive the each several part coded-bit with the low density parity check code coding, and described each several part coded-bit distributes according to the column weight of the check matrix that generates described coded-bit;
Acquisition module is used for obtaining from described each several part coded-bit the column weight of each several part coded-bit correspondence;
First computing module is used for calculating the transmitting power ratio that sends described each several part coded-bit according to described column weight;
Second computing module is used for calculating the transmitting power that sends described each several part coded-bit according to described transmitting power ratio and total transmitting power;
Control module is used to control the corresponding transmitting power that calculates with described second computing module and sends described each several part coded-bit.
14. output control device according to claim 13 is characterized in that, described first computing module comprises:
Detecting unit is used to detect the signal to noise ratio of transmitting antenna;
First computing unit is used for calculating the transmitting power ratio of the transmitting antenna that sends the each several part coded-bit according to described column weight and the transmission signal to noise ratio with the transmitting antenna of the corresponding coded-bit of described column weight.
15., it is characterized in that described control module comprises according to claim 13 or 14 described output control devices:
Dispensing device is used to generate and send described each several part coded-bit with the low density parity check code coding;
Control unit, the transmitting power that is used to control the described each several part coded-bit of transmission that described dispensing device calculates with described second computing module sends the appropriate section coded-bit.
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CN1625057A (en) * 2003-12-04 2005-06-08 北京泰美世纪科技有限公司 High structural LDPC coding and decoding method and coder and decoder
CN1770640A (en) * 2004-11-04 2006-05-10 中兴通讯股份有限公司 Coder/decoder for low-density parity check code and its forming method

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CN1625057A (en) * 2003-12-04 2005-06-08 北京泰美世纪科技有限公司 High structural LDPC coding and decoding method and coder and decoder
CN1770640A (en) * 2004-11-04 2006-05-10 中兴通讯股份有限公司 Coder/decoder for low-density parity check code and its forming method

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