CN101095303A - Apparatus and method for transmitting and receiving a signal in a communication system - Google Patents
Apparatus and method for transmitting and receiving a signal in a communication system Download PDFInfo
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- CN101095303A CN101095303A CN 200580045639 CN200580045639A CN101095303A CN 101095303 A CN101095303 A CN 101095303A CN 200580045639 CN200580045639 CN 200580045639 CN 200580045639 A CN200580045639 A CN 200580045639A CN 101095303 A CN101095303 A CN 101095303A
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Abstract
An apparatus and method for transmitting a signal in a communication system. An information vector is encoded using a structured low density parity check (LDPC) coding scheme supporting a first coding rate, to generate a first structured LDPC codeword vector including a first part mapped to the information vector and a second part mapped to a parity vector. The first structured LDPC codeword vector is transmitted to a signal reception apparatus. If there is an error in the first structured LDPC codeword vector, the information vector is encoded using a structured LDPC coding scheme supporting a second coding rate, to generate a second structured LDPC codeword vector including the first part, the second part, and a third part mapped to an additional parity vector of the information vector. The third part is transmitted to the signal reception apparatus.
Description
Technical field
The present invention relates generally to and is used for sending and the apparatus and method of received signal in communication system, particularly, relates to and is used for using structured low density parity check (LDPC) yard to send apparatus and method with received signal in communication system.
Background technology
Next generation communication system has developed and has been packet service communication system.Described packet service communication system is a kind of system that is used for sending to a plurality of mobile radio stations (MS) pulse (burst) grouped data, is designed to the high capacity data transmission.
Proposed such as the various data transmission schemes of mixed automatic repeat request (HARQ) scheme and adaptive modulation and coding (AMC) scheme to increase data throughout for next generation communication system.In order to support HARQ scheme and AMC scheme, described communication system must be supported various encoding rates.
Usually, next generation communication system uses LDPC sign indicating number and turbo sign indicating number.As everyone knows, the LDPC sign indicating number shows high performance gains when being used for high speed data transfer, and the LDPC sign indicating number corrects effectively by the mistake that noise caused that produces in the transmission channel, thereby contributes for the growth of data transmission credibility.
Fig. 1 is the block diagram that the legacy communications system of LDPC sign indicating number is used in explanation.With reference to Fig. 1, described communication system comprises sender unit 100 and signal receiving device 150.Sender unit 100 comprises encoder 111, modulator 113 and radio frequency (RF) processor 115; Signal receiving device 150 then comprises RF processor 151, demodulator 153 and decoder 155.If sender unit 100 wishes to send information vector
s, then with information vector
sOffer encoder 111.Encoder 111 uses the predictive encoding scheme with information vector
sBe encoded to codeword vector
c(that is, the LDPC code word), and the codeword vector that will generate
cOutput to modulator 113.Wherein, described predictive encoding scheme refers to the LDPC encoding scheme.Modulator 113 uses predetermined modulation schemes with codeword vector
cBe modulated to modulation vector
m, and with modulation vector
mOutput to RF processor 115.115 pairs of modulation vector of RF processor from modulator 113 outputs
mCarry out RF and handle, and will send to signal receiving device 150 through the signal that RF-handles by antenna ANT.
Fig. 2 is the view of the parity matrix of the traditional LDPC sign indicating number of explanation.With reference to Fig. 2, form the parity matrix of described LDPC sign indicating number so that whole parity matrix is divided into a plurality of, and permutation matrix is mapped to independent piece.Here each all has N will to suppose described permutation matrix
s* N
SSize.
As shown in Figure 2, the parity matrix of described structured LDPC code is divided into m * n piece, and permutation matrix is mapped to each piece in described m * n piece.P
MnRepresent the permutation matrix on the point that the m piece is capable and n piece row are intersected with each other in the middle of a plurality of that are arranged in described parity matrix.The described permutation matrix that is mapped to each piece will be called as " block matrix ".Therein in the parity matrix of selection unit's matrix as whole block matrix,, all the other N have just been determined in case determined the point of the nonzero element in first row of each piece
sThe point of-1 nonzero element.Thereby, compare with the memory span that the point of wherein selecting nonzero element brokenly is required, will be used to store about the required memory span of the full detail of described parity matrix and be reduced to 1/N
s
Described communication system uses various error control scheme with the enhanced system reliability, and mixed automatic repeat request (HARQ) scheme is to make up a kind of scheme that obtains by the advantage with the forward error correction in the middle of the described error control scheme (FEC) scheme and automatic repetitive requests (ARQ) scheme.HARQ scheme (that is, by using the FEC scheme to correct a kind of scheme that the frequent error pattern that produces reduces the quantity of repeating transmission) is divided into three types: I type, II type and III type.Described three types of HARQ scheme will be described now.
Fig. 3 illustrates that schematically the I type in the legacy communications system sends and receive the view of operation based on the signal of HARQ.Yet, before the description that provides Fig. 3, should be noted that can use a kind of two kinds of different codings of encoding or use of having error correction and error detection function concurrently (wherein a kind of have error correction and another kind has error detection function) to carry out the I type sends and receive operation based on the signal of HARQ.Further, supposition is used two kinds of different codings (wherein a kind of have error correction and another kind has error detection function) to carry out the I type and is sent and receive operation based on the signal of HARQ among Fig. 3.
With reference to Fig. 3, in I type HARQ scheme, sender unit initialization with retransmit in send codeword vector with identical form.Also be, when initialization, described sender unit is by (for example using the predictive encoding scheme, support the turbo encoding scheme of pre-determined constant encoding rate) first encoder with k-position information vector be encoded to the codeword vector that is used for error detection (k ', k), by (for example using the predictive encoding scheme, support the turbo encoding scheme of pre-determined constant encoding rate) second encoder once more with codeword vector (k ', k) be encoded to the codeword vector (n that is used for error correction, k '), and then send codeword vector (n, k ') as the final code word vector.
Afterwards, during repeating transmission that the mistake that occurs in the codeword vector by initialization causes, the codeword vector that described sender unit is sent when being sent in initialization (n, k ').Wherein, the encoding rate of supposing codeword vector (n, k ') is R
0, and because codeword vector (n, k ') is to encode with the turbo encoding scheme, so it comprises the message part S that is mapped to described information vector
0And the parity check part (P that is mapped to parity vector
00, P
01).As a result, in I type HARQ scheme, for initialization is used identical encoding rate R with retransmitting
0, therefore send identical codeword vector (n, k ').
When the codeword vector that receives by described sender unit initialization, signal receiving device is decoded with the mistake in the codeword vector of correcting this reception by the codeword vector that first decoder that uses the decoding scheme corresponding with the described encoding scheme used in the described sender unit will receive.The operation correspondence of coding codeword vector (n, k ') in the described decode operation of first decoder and second encoder of described sender unit, and the codeword vector that should receive (when its during by error correction correctly) is restored be codeword vector (k ', k).
After the codeword vector error correction that will receive, second decoder of described signal receiving device by using the decoding scheme corresponding with the described encoding scheme used in the described sender unit will be through the codeword vector decoding of the reception of error correction, thus the mistake of detection in the codeword vector of the reception of error correction.Coding codeword vector in the described decode operation of second decoder and first encoder of described sender unit (k ', operation correspondence k).When detecting wrong in the codeword vector of the reception of error correction, described signal receiving device sends negative response (NAK) information of undesired reception of codeword vector of indication initialization with the corresponding codeword vector of request repeat to described sender unit.Described signal receiving device is buffered in wrong after testing codeword vector in its buffer temporarily, prepares the codeword vector combination with wrong after testing codeword vector and repeating transmission.Yet when when not detecting mistake in the codeword vector of the reception of error correction, described signal receiving device sends (ACK) information of replying of normal reception of the codeword vector of indication initialization to described sender unit.
If described sender unit in response to from described signal receiving device to the re-send request may of described codeword vector and retransmit the codeword vector (n that it is sent when the initialization, k '), then described signal receiving device receives the described codeword vector by described signal transmission apparatus retransmits, the codeword vector error correction that will receive by first decoder, will be through of the codeword vector combination of the codeword vector of the reception of error correction with the wherein wrong after testing initialization of buffering, and then detect possible mistake in the codeword vector of the reception of combination by second decoder.Thereby described sender unit and described signal receiving device are in predetermined number of retransmissions or repeatedly carry out signal transmission and the reception operation of I type based on HARQ in the given time, till normally restoring described k-position information vector.
As mentioned above, because described sender unit sends identical codeword vector in initialization and subsequent retransmissions, so the I type sends based on the signal of HARQ and reception operates in and reduces throughput of system under the bad channel conditions sharp.
Fig. 4 illustrates that schematically the II type in the legacy communications system sends and receive the view of operation based on the signal of HARQ.Yet, before the description that provides Fig. 4, should be noted that can use a kind of two kinds of different codings of encoding or use of having error correction and error detection function concurrently (wherein a kind of have error correction and another kind has error detection function) to carry out the II type sends and receive operation based on the signal of HARQ.Further, supposition is used two kinds of different codings (wherein a kind of have error correction and another kind has error detection function) to carry out the II type and is sent and receive operation based on the signal of HARQ among Fig. 4.
With reference to Fig. 4, in II type HARQ scheme, sender unit initialization with retransmit in send codeword vector with different forms.Also be, when initialization, described sender unit is by (for example using the predictive encoding scheme, support the turbo encoding scheme of pre-determined constant encoding rate) first encoder with k-position information vector be encoded to the codeword vector that is used for error detection (k ', k), by (for example using the predictive encoding scheme, support the turbo encoding scheme of pre-determined constant encoding rate) second encoder once more with codeword vector (k ', k) be encoded to the codeword vector (n that is used for error correction, k '), and then send codeword vector (n, k ') as the final code word vector.If the supported encoding rate of supposition codeword vector (n, k ') is R
0, R
1..., R
L(R wherein
0＞R
1＞...＞R
L), then described sender unit sends codeword vector (n, k ') (R when initialization
0), (n, k ') (R wherein
0) presentation code rate R
0Under codeword vector (n, k ').Further, because codeword vector (n, k ') (R
0) be to encode with the turbo encoding scheme, so it comprises the message part S that is mapped to described information vector
0And the parity check part (P that is mapped to parity vector
00, P
01).
Afterwards, during repeating transmission that the mistake that occurs in the codeword vector by initialization causes, described sender unit only will be codeword vector (n, k ') (R
0) prepare about codeword vector (n, k ') (R
1) additional parity vector P
1Send to described signal receiving device, wherein this codeword vector (n, k ') (R
1) be codeword vector (n, k ') (R that is sent during with initialization
0) different codeword vector.Codeword vector (n, k ') (R
1) comprise and be mapped to described information vector and parity check part (P
00, P
01) message part S
0And the parity check part P that is mapped to parity vector
1As a result, described sender unit when retransmitting only with parity check part P
1Send to described signal receiving device.
When the codeword vector that receives by described sender unit initialization, signal receiving device is decoded with the mistake in the codeword vector of correcting this reception by the codeword vector that first decoder that uses the decoding scheme corresponding with the described encoding scheme used in the described sender unit will receive.The operation correspondence of coding codeword vector (n, k ') in the described decode operation of first decoder and second encoder of described sender unit, and the codeword vector that should receive (when its during by error correction correctly) is restored be codeword vector (k ', k).
After the codeword vector error correction that will receive, second decoder of described signal receiving device by using the decoding scheme corresponding with the described encoding scheme used in the described sender unit will be through the codeword vector decoding of the reception of error correction, thus the mistake of detection in the codeword vector of the reception of error correction.Coding codeword vector in the described decode operation of second decoder and first encoder of described sender unit (k ', operation correspondence k).
When detecting wrong in the codeword vector of the reception of error correction, described signal receiving device sends the NAK information of undesired reception of codeword vector of indication initialization with the corresponding codeword vector of request repeat to described sender unit.Described signal receiving device is buffered in wrong after testing codeword vector in its buffer temporarily, prepares the codeword vector combination with wrong after testing codeword vector and repeating transmission.Yet when when not detecting mistake in the codeword vector of the reception of error correction, described signal receiving device sends the ACK information of normal reception of the codeword vector of indication initialization to described sender unit.
If described sender unit is in response to add codeword vector (n, k ') (R that it is sent when the initialization to from described signal receiving device the re-send request may of described codeword vector is only retransmitted
0) parity vector P
1Then described signal receiving device receives the described codeword vector by described signal transmission apparatus retransmits, the codeword vector error correction that will receive by first decoder, will be through of the codeword vector combination of the codeword vector of the reception of error correction with the wherein wrong after testing initialization of buffering, and then detect possible mistake in the codeword vector of the reception of combination by second decoder.Thereby described sender unit and described signal receiving device are in predetermined number of retransmissions or repeatedly carry out signal transmission and the reception operation of II type based on HARQ in the given time, till normally restoring described k-position information vector.
As mentioned above, send and receive in the operation at the signal of II type based on HARQ, described sender unit only sends the additional parity vector of the codeword vector that has before sent when retransmitting.Thereby if in the described codeword vector of described sender unit initialization gross mistake is arranged, then described signal receiving device may can't correctly restore described information vector once in a while.Thereby described sender unit periodically (for example, is retransmitted for L time every predetermined quantity) and is retransmitted the codeword vector of initialization, so that can normally restore described information vector.
Yet, because the II type operates in the codeword vector (n that must generate the support variable coding rate when retransmitting based on signal transmission and the reception of HARQ, k '), described sender unit should comprise and is used for generated codeword vector (n, k ') extra encoder, and described signal receiving device also should comprise the extra decoder that is used for decodes codeword vector (n, k ').In addition, when retransmitting, described sender unit only sends the parity vector of the codeword vector of adding initialization to, rather than the complete code vector (n of described variable coding rate is supported in transmission, k '), so it must comprise the perforator that is used for the perforation of the remainder except that this additional parity vector.As a result, the II type causes non-hardware complexity of preferring to increase based on signal transmission and the reception operation of HARQ.
Fig. 5 illustrates that schematically the III type in the legacy communications system sends and receive the view of operation based on the signal of HARQ.Yet, before the description that provides Fig. 5, should be noted that can use a kind of two kinds of different codings of encoding or use of having error correction and error detection function concurrently (wherein a kind of have error correction and another kind has error detection function) to carry out the III type sends and receive operation based on the signal of HARQ.Further, supposition is used two kinds of different codings (wherein a kind of have error correction and another kind has error detection function) to carry out the III type and is sent and receive operation based on the signal of HARQ among Fig. 5.
With reference to Fig. 5, in III type HARQ scheme, sender unit initialization with retransmit in send codeword vector with different forms.Also be, when initialization, described sender unit is by (for example using the predictive encoding scheme, support the turbo encoding scheme of pre-determined constant encoding rate) first encoder with k-position information vector be encoded to the codeword vector that is used for error detection (k ', k), by (for example using the predictive encoding scheme, support the turbo encoding scheme of pre-determined constant encoding rate) second encoder once more with codeword vector (k ', k) be encoded to the codeword vector (n that is used for error correction, k '), and then send codeword vector (n, k ') as the final code word vector.
If the supported encoding rate of supposition codeword vector (n, k ') is R
0, R
1..., R
L(R wherein
0＞R
1＞...＞R
L), then described sender unit sends codeword vector (n, k ') (R when initialization
0), (n, k ') (R wherein
0) presentation code rate R
0Under codeword vector (n, k ').Because codeword vector (n, k ') (R
0) be to encode with the turbo encoding scheme, so it comprises the message part S that is mapped to described information vector
0And the parity check part (P that is mapped to parity vector
00, P
01).
Afterwards, during repeating transmission that the mistake that occurs in the codeword vector by initialization causes, codeword vector (n, k ') (R that described sender unit is sent when described signal receiving device sends with initialization
0) different codeword vector, that is, and message part S
0And be codeword vector (n, k ') (R
0) prepare about codeword vector (n, k ') (R
1) additional parity vector P
1This codeword vector (n, k ') (R
1) comprise and be mapped to described information vector and parity check part (P
00, P
01) message part S
0And the parity check part P that is mapped to parity vector
1As a result, described sender unit when retransmitting with message part S
0And parity check part P
1Send to described signal receiving device.
When the codeword vector that receives by described sender unit initialization, signal receiving device is decoded by the codeword vector that first decoder that uses the decoding scheme corresponding with the described encoding scheme used in the described sender unit will receive, thereby corrects the mistake in the codeword vector of this reception.The operation correspondence of coding codeword vector (n, k ') in the described decode operation of first decoder and second encoder of described sender unit, and the codeword vector that should receive (when its during by error correction correctly) is restored be codeword vector (k ', k).
After the codeword vector error correction that will receive, second decoder of described signal receiving device by using the decoding scheme corresponding with the described encoding scheme used in the described sender unit will be through the codeword vector decoding of the reception of error correction, thus the mistake of detection in the codeword vector of the reception of error correction.Coding codeword vector in the described decode operation of second decoder and first encoder of described sender unit (k ', operation correspondence k).
When detecting wrong in the codeword vector of the reception of error correction, described signal receiving device sends the NAK information of undesired reception of codeword vector of indication initialization with the corresponding codeword vector of request repeat to described sender unit.Described signal receiving device is buffered in wrong after testing codeword vector in its buffer temporarily, prepares the codeword vector combination with wrong after testing codeword vector and repeating transmission.Yet when when not detecting mistake in the codeword vector of the reception of error correction, described signal receiving device sends the ACK information of normal reception of the codeword vector of indication initialization to described sender unit.
If described sender unit is in response to codeword vector (n, k ') (R of its transmission to the re-send request may of described codeword vector and when retransmitting with initialization from described signal receiving device
0) different message part S
0And parity vector P
1Then described signal receiving device receives the described codeword vector by described signal transmission apparatus retransmits, the codeword vector error correction that will receive by first decoder, will be through of the codeword vector combination of the codeword vector of the reception of error correction with the wherein wrong after testing initialization of buffering, and then detect possible mistake in the codeword vector of the reception of combination by second decoder.Thereby described sender unit and described signal receiving device are in predetermined number of retransmissions or repeatedly carry out signal transmission and the reception operation of III type based on HARQ in the given time, restore described k-position information vector up to normally.
As mentioned above, send and receive in the operation at the signal of III type based on HARQ, message part that the transmission when retransmitting of described sender unit is different with the codeword vector that has before sent and additional parity part (, new parity check part).Thereby described signal receiving device only uses the codeword vector of described repeating transmission just can normally restore described information vector.Also promptly, but described signal receiving device is self-demarking code.
Yet, because the III type operates in the codeword vector (n that must generate the support variable coding rate when retransmitting based on signal transmission and the reception of HARQ, k '), so should comprising, described sender unit is used for generated codeword vector (n, k ') extra encoder, and described signal receiving device also should comprise the extra decoder that is used for decodes codeword vector (n, k ').In addition, when retransmitting, described sender unit sends message part and additional parity part, rather than sends the complete code vector (n that supports described variable coding rate, k '), so it must comprise the perforator that is used for the perforation of the remainder except that this additional parity vector.As a result, the III type causes non-hardware complexity of preferring to increase based on signal transmission and the reception operation of HARQ.
Summary of the invention
Thereby, the purpose of this invention is to provide a kind of apparatus and method that are used in communication system transmission and received signal.
Another object of the present invention provides the II type with minimized hardware complexity in a kind of communication system based on signal sending and receiving device and the method for HARQ.
Another object of the present invention provides the III type with minimized hardware complexity in a kind of communication system based on signal sending and receiving device and the method for HARQ.
According to an aspect of the present invention, provide a kind of method that is used for sending signal in communication system.The method comprising the steps of: the information vector that reception will send; Use to support structured low density parity check (LDPC) encoding scheme of the first encoding rate described information vector of encoding; The first structured LDPC code word vector that generation comprises the first that is mapped to described information vector and is mapped to the second portion of parity vector; The described first structured LDPC code word vector is sent to signal receiving device; When in detecting this first structured LDPC code word vector, mistake occurring, use to support the structured LDPC encoding scheme of the second encoding rate described information vector of encoding, and generate the second structured LDPC code word vector of third part that comprises described first, described second portion and be mapped to the additional parity vector of described information vector; And described third part sent to described signal receiving device.
Description of drawings
By the detailed description below in conjunction with accompanying drawing, it is more apparent that above and other objects of the present invention, feature and advantage will become, wherein:
Fig. 1 is the block diagram that the legacy communications system of LDPC sign indicating number is used in explanation;
Fig. 2 is the view of the parity matrix of the traditional LDPC sign indicating number of explanation;
Fig. 3 illustrates that schematically the I type in the legacy communications system sends and receive the view of operation based on the signal of HARQ;
Fig. 4 illustrates that schematically the II type in the legacy communications system sends and receive the view of operation based on the signal of HARQ;
Fig. 5 illustrates that schematically the III type in the legacy communications system sends and receive the view of operation based on the signal of HARQ;
Fig. 6 illustrates that schematically the II type in the communication system according to an embodiment of the invention sends and receive the view of operation based on the signal of HARQ;
Fig. 7 illustrates that schematically the III type in the communication system according to an embodiment of the invention sends and receive the view of operation based on the signal of HARQ.
Embodiment
Hereinafter with reference to accompanying drawing the preferred embodiments of the present invention are described in detail.In the accompanying drawing, identical or similar element is represented with identical reference numerals, even they are described in different accompanying drawings.In the following describes, for knowing and having omitted for purpose of brevity to the known function of wherein merging and the detailed description of structure.
The present invention proposes signal sending and receiving device and the method in a kind of communication system.Especially, the present invention proposes a kind of use structured low density parity check (LDPC) sign indicating number and sends apparatus and method with received signal.Further, the present invention propose a kind of by use II type mixed automatic repeat request (HARQ) scheme and III type HARQ scheme send and the received signal process in utilize structured LDPC code to minimize the signal sending and receiving device and the method for hardware complexity.Although not explanation separately, the present invention also can will be used the transmission of the structured LDPC code that is proposed and the signal sending and receiving device of operational applications in the communication system shown in Fig. 1 of received signal.
The encoder of the structured LDPC code described structured LDPC code that can generate and decode is only stored very in a small amount parity matrix according to the characteristic of described LDPC sign indicating number.Also promptly, described encoder and described decoder can be used the different encoding rates described structured LDPC code that generates and decode by storage and the structured LDPC code with different a plurality of encoding rates and piece size or codeword size are corresponding in memory parity matrix and according to the channel conditions of described communication system.Thereby, can be by revising the described parity matrix described structured LDPC code that generates and decode according to the change of encoding rate and piece size simply, and needn't revise described encoder and described hardware decoders structure.Yet, if the turbo sign indicating number (the two all is commonly used in current communication system) that uses convolution code and have the structure that obtains by the cascade convolution code, if then changed encoding rate and piece size, just must be according to the encoding rate after changing and the hardware configuration of the described encoder of piece modification of dimension.
Thereby the present invention proposes a kind of apparatus and method based on transmission of HARQ scheme and received signal of using structured LDPC code.Illustrate that with reference to Fig. 6 the signal based on II type HARQ scheme that proposes in the embodiments of the invention sends and receive operation, and illustrate that with reference to Fig. 7 the signal based on III type HARQ scheme that proposes in the embodiments of the invention sends and receive operation.
Yet, send and receive based on the signal of HARQ before operation and III type send based on the signal of HARQ and receive the description of operation providing the II type, will illustrate below that the I type sends and receives based on the signal of HARQ to operate.
Can use a kind of two kinds of different codings of encoding or use of having error correction and error detection function concurrently (wherein a kind of have error correction and another kind has error detection function) to carry out the I type and send and receive operation based on the signal of HARQ.Further, supposition is here used two kinds of different codings (wherein a kind of have error correction and another kind has error detection function) to carry out the I type and is sent and receive operation based on the signal of HARQ.
In I type HARQ scheme, sender unit initialization with retransmit in send codeword vector with identical form.Also be, when initialization, described sender unit is by (for example using the predictive encoding scheme, support the structured LDPC encoding scheme of pre-determined constant encoding rate) first encoder with k-position information vector be encoded to the codeword vector that is used for error detection (k ', k), by (for example using the predictive encoding scheme, support the structured LDPC encoding scheme of pre-determined constant encoding rate) second encoder once more with codeword vector (k ', k) be encoded to the codeword vector (n that is used for error correction, k '), and then send codeword vector (n, k ') as the final code word vector.
Afterwards, during repeating transmission that the mistake that occurs in the codeword vector by initialization causes, the codeword vector that described sender unit is sent when being sent in initialization (n, k ').Wherein, the encoding rate of supposing codeword vector (n, k ') is R
0, and codeword vector (n, k ') comprises the message part S that is mapped to described information vector
0And the parity check part P that is mapped to parity vector
0As a result, in I type HARQ scheme, for initialization is used identical encoding rate R with retransmitting
0, therefore send identical codeword vector (n, k ').
When the codeword vector that receives by described sender unit initialization, signal receiving device is decoded with the mistake in the codeword vector of correcting this reception by the codeword vector that first decoder that uses the decoding scheme corresponding with the described encoding scheme used in the described sender unit will receive.The operation correspondence of generated codeword vector (n, k ') in the described decode operation of first decoder and second encoder of described sender unit, and the codeword vector that should receive (when its during by error correction correctly) is restored be codeword vector (k ', k).
After the codeword vector error correction that will receive, second decoder of described signal receiving device by using the decoding scheme corresponding with the described encoding scheme used in the described sender unit will be through the codeword vector decoding of the reception of error correction, thus the mistake of detection in the codeword vector of the reception of error correction.Produce in the described decode operation of second decoder and first encoder of described sender unit codeword vector (k ', operation correspondence k).
When detecting wrong in the codeword vector of the reception of error correction, described signal receiving device sends negative response (NAK) information of undesired reception of codeword vector of indication initialization with the corresponding codeword vector of request repeat to described sender unit.Described signal receiving device is buffered in wrong after testing codeword vector in its buffer temporarily, prepares the codeword vector combination with wrong after testing codeword vector and repeating transmission.Yet when when not detecting mistake in the codeword vector of the reception of error correction, described signal receiving device sends (ACK) information of replying of normal reception of the codeword vector of indication initialization to described sender unit.
If described sender unit in response to from described signal receiving device to the re-send request may of described codeword vector and retransmit the codeword vector (n that it is sent when the initialization, k '), then described signal receiving device receives the described codeword vector by described signal transmission apparatus retransmits, the codeword vector error correction that will receive by first decoder, will be through of the codeword vector combination of the codeword vector of the reception of error correction with the wherein wrong after testing initialization of buffering, and then detect possible mistake in the codeword vector of the reception of combination by second decoder.
In the description of front, when the NAK information that receives from described signal receiving device, the described signal that described signal transmission apparatus retransmits is corresponding with this NAK information.Yet, when any response of failing within the scheduled time after initialization to receive from described signal receiving device (, when failing to receive described ACK or NAK information), described sender unit can determine that the signal of described initialization makes mistakes and carry out signal repetition operation.
Thereby described sender unit and described signal receiving device are in predetermined number of retransmissions or repeatedly carry out signal transmission and the reception operation of I type based on HARQ in the given time, restore described k-position information vector up to normally.
Fig. 6 illustrates that schematically the II type in the communication system according to an embodiment of the invention sends and receive the view of operation based on the signal of HARQ.Yet, before the description that provides Fig. 6, should be noted that can use a kind of two kinds of different codings of encoding or use of having error correction and error detection function concurrently (wherein a kind of have error correction and another kind has error detection function) to carry out the II type sends and receive operation based on the signal of HARQ.Further, supposition is used two kinds of different codings (wherein a kind of have error correction and another kind has error detection function) to carry out the II type and is sent and receive operation based on the signal of HARQ among Fig. 6.
With reference to Fig. 6, in II type HARQ scheme, sender unit initialization with retransmit in send codeword vector with different forms, as mentioned above.Thereby, in the embodiments of the invention, when initialization, described sender unit is by (for example using the predictive encoding scheme, support the structured LDPC encoding scheme of pre-determined constant encoding rate) first encoder with k-position information vector be encoded to the codeword vector that is used for error detection (k ', k), by (for example using the predictive encoding scheme, support the structured LDPC encoding scheme of pre-determined constant encoding rate) second encoder once more with codeword vector (k ', k) be encoded to the codeword vector (n that is used for error correction, and then send codeword vector (n, k ') k '), as the final code word vector.If the supported encoding rate of supposition codeword vector (n, k ') is R
0, R
1..., R
L(R wherein
0＞R
1＞...＞R
L), described sender unit sends codeword vector (n, k ') (R when initialization
0), (n, k ') (R wherein
0) presentation code rate R
0Under codeword vector (n, k ').Because codeword vector (n, k ') (R
0) be to encode with the structured LDPC encoding scheme, so it comprises the message part S that is mapped to described information vector
0And the parity check part P that is mapped to parity vector
0
Afterwards, during repeating transmission that the mistake that occurs in the codeword vector by initialization causes, described sender unit only will be codeword vector (n, k ') (R
0) prepare about codeword vector (n, k ') (R
1) additional parity vector P
1Send to described signal receiving device, wherein this codeword vector (n, k ') (R
1) be codeword vector (n, k ') (R that is sent during with initialization
0) different codeword vector.Codeword vector (n, k ') (R
1) comprise and be mapped to described information vector and parity check part P
0Message part S
0And the parity check part P that is mapped to parity vector
1As a result, described sender unit when retransmitting only with parity check part P
1Send to described signal receiving device.
When the codeword vector that receives by described sender unit initialization, signal receiving device is decoded with the mistake in the codeword vector of correcting this reception by the codeword vector that first decoder that uses the decoding scheme corresponding with the described encoding scheme used in the described sender unit will receive.The operation correspondence of coding codeword vector (n, k ') in the described decode operation of first decoder and second encoder of described sender unit, and the codeword vector that should receive (when its during by error correction correctly) is restored be codeword vector (k ', k).
After the codeword vector error correction that will receive, second decoder of described signal receiving device by using the decoding scheme corresponding with the described encoding scheme used in the described sender unit will be through the codeword vector decoding of the reception of error correction, thus the mistake of detection in the codeword vector of the reception of error correction.Generated codeword vector in the described decode operation of second decoder and first encoder of described sender unit (k ', operation correspondence k).
When detecting wrong in the codeword vector of the reception of error correction, described signal receiving device sends the NAK information of undesired reception of the codeword vector of indication initialization to described sender unit, with the corresponding codeword vector of request repeat.Described signal receiving device is buffered in wrong after testing codeword vector in its buffer temporarily, prepares the codeword vector combination with wrong after testing codeword vector and repeating transmission.Yet when when not detecting mistake in the codeword vector of the reception of error correction, described signal receiving device sends the ACK information of normal reception of the codeword vector of indication initialization to described sender unit.
If described sender unit is in response to add codeword vector (n, k ') (R that it is sent when the initialization to from described signal receiving device the re-send request may of described codeword vector is only retransmitted
0) parity vector P
1Then described signal receiving device receives the described codeword vector by described signal transmission apparatus retransmits, the codeword vector error correction that will receive by first decoder, will be through of the codeword vector combination of the codeword vector of the reception of error correction with the wherein wrong after testing initialization of buffering, and then detect possible mistake in the codeword vector of the reception of combination by second decoder.
In the description of front, when the NAK information that receives from described signal receiving device, the described signal that described signal transmission apparatus retransmits is corresponding with this NAK information.Yet, when any response of failing within the scheduled time after initialization to receive from described signal receiving device (, when failing to receive described ACK or NAK information), described sender unit can determine that the signal of described initialization makes mistakes and carry out signal repetition operation.Like this, described sender unit and described signal receiving device are in predetermined number of retransmissions or repeatedly carry out signal transmission and the reception operation of II type based on HARQ in the given time, till normally restoring described k-position information vector.
As mentioned above, send and receive in the operation at the signal of II type based on HARQ, described sender unit only sends the additional parity vector of the codeword vector that has before sent when retransmitting.Thereby if in the described codeword vector of described sender unit initialization gross mistake is arranged, then described signal receiving device may can't correctly restore described information vector once in a while.Thereby described sender unit periodically (for example, is retransmitted for L time every predetermined quantity) and is retransmitted the codeword vector of initialization, so that can normally restore described information vector.
As mentioned above, send and receive in the operation at the signal of II type based on HARQ, described sender unit must generate the codeword vector (n, k ') of supporting variable coding rate when retransmitting.Yet, according to the embodiments of the invention that wherein use structured LDPC code, described sender unit does not need to comprise and is used for generated codeword vector (n, k ') extra encoder, and described signal receiving device does not need to comprise the extra decoder that is used for decodes codeword vector (n, k ') yet.Can be in described signal sending and receiving device generate and decode and support the codeword vector (n, k ') of described variable coding rate by storing corresponding parity-check matrix simply.
Also promptly, described sender unit and described signal receiving device can be by storing a plurality of parity matrixs of supporting described variable coding rate (that is, supporting a plurality of encoding rates) and generating and the codeword vector of decoding (n, k ') simply.Described sender unit and described signal receiving device can use the complete parity matrix (that is close parity matrix) that initially provides in the described communication system to support the parity matrix of described variable coding rate or use by revising the sub-parity matrix that this parent's parity matrix generates as being used to.
In addition alternatively, described sender unit and described signal receiving device can be stored a plurality of parity matrixs that are mapped to described a plurality of encoding rates respectively therein in advance, and if are necessary then to use the parity matrix of the encoding rate that is mapped to their associations.Compare with using traditional LDPC coding, use structured LDPC code to reduce and be used to store the required memory span of described parity matrix.
More particularly, as mentioned above, form the parity matrix of described LDPC sign indicating number so that whole parity matrix is divided into a plurality of, and permutation matrix is mapped to independent piece.Here each all has N will to suppose described permutation matrix
s* N
SSize, the parity matrix of described structured LDPC code is divided into m * n piece, and permutation matrix is mapped to each piece in described m * n piece.The described permutation matrix that is mapped to each piece will be called as " block matrix ".Therein in the parity matrix of selection unit's matrix as whole block matrix,, all the other N have just been determined in case determined the point of the nonzero element in first row of each piece
sThe point of-1 nonzero element.Thereby, compare with memory span required under the situation of the point of wherein selecting nonzero element brokenly, will be used to store about the required memory span of the full detail of described parity matrix and be reduced to 1/N
s
As a result, using structured LDPC code to make it possible to carry out the II type sends based on the signal of HARQ and receives operation and need not to increase hardware complexity.
Fig. 7 illustrates that schematically the III type in the communication system according to an embodiment of the invention sends and receive the view of operation based on the signal of HARQ.Yet, before the description that provides Fig. 7, should be noted that can use a kind of two kinds of different codings of encoding or use of having error correction and error detection function concurrently (wherein a kind of have error correction and another kind has error detection function) to carry out the III type sends and receive operation based on the signal of HARQ.Further, supposition is used two kinds of different codings (wherein a kind of have error correction and another kind has error detection function) to carry out the III type and is sent and receive operation based on the signal of HARQ among Fig. 7.
With reference to Fig. 7, in III type HARQ scheme, sender unit initialization with retransmit in send codeword vector with different forms.Also be, when initialization, described sender unit is by (for example using the predictive encoding scheme, support the structured LDPC code scheme of pre-determined constant encoding rate) first encoder with k-position information vector be encoded to the codeword vector that is used for error detection (k ', k), by (for example using the predictive encoding scheme, support the structured LDPC code scheme of pre-determined constant encoding rate) second encoder once more with codeword vector (k ', k) be encoded to the codeword vector (n that is used for error correction, k '), and then send codeword vector (n, k ') as the final code word vector.If the supported encoding rate of supposition codeword vector (n, k ') is R
0, R
1..., R
L(R wherein
0＞R
1＞...＞R
L), then described sender unit sends codeword vector (n, k ') (R when initialization
0), (n, k ') (R wherein
0) presentation code rate R
0Under codeword vector (n, k ').Because codeword vector (n, k ') (R
0) be to encode with the structured LDPC code scheme, so it comprises the message part S that is mapped to described information vector
0And the parity check part P that is mapped to parity vector
0
Afterwards, during repeating transmission that the mistake that occurs in the codeword vector by initialization causes, codeword vector (n, k ') (R that described sender unit is sent when described signal receiving device sends with initialization
0) different codeword vector, that is, and message part S
0And be codeword vector (n, k ') (R
0) prepare about codeword vector (n, k ') (R
1) additional parity vector P
1This codeword vector (n, k ') (R
1) comprise and be mapped to described information vector and parity check part P
0Message part S
0And the parity check part P that is mapped to parity vector
1As a result, described sender unit when retransmitting with message part S
0And parity check part P
1Send to described signal receiving device.
When the codeword vector that receives by described sender unit initialization, signal receiving device is decoded by the codeword vector that first decoder that uses the decoding scheme corresponding with the described encoding scheme used in the described sender unit will receive, thereby corrects the mistake in the codeword vector of this reception.The operation correspondence of coding codeword vector (n, k ') in the described decode operation of first decoder and second encoder of described sender unit, and the codeword vector that should receive (when its during by error correction correctly) is restored be codeword vector (k ', k).
After the codeword vector error correction that will receive, second decoder of described signal receiving device by using the decoding scheme corresponding with the described encoding scheme used in the described sender unit will be through the codeword vector decoding of the reception of error correction, thus the mistake of detection in the codeword vector of the reception of error correction.Coding codeword vector in the described decode operation of second decoder and first encoder of described sender unit (k ', operation correspondence k).
When detecting wrong in the codeword vector of the reception of error correction, described signal receiving device sends the NAK information of undesired reception of the codeword vector of indication initialization to described sender unit, with the corresponding codeword vector of request repeat.Described signal receiving device is buffered in wrong after testing codeword vector in its buffer temporarily, prepares the codeword vector combination with wrong after testing codeword vector and repeating transmission.Yet when when not detecting mistake in the codeword vector of the reception of error correction, described signal receiving device sends the ACK information of normal reception of the codeword vector of indication initialization to described sender unit.
If described sender unit is in response to codeword vector (n, k ') (R of its transmission to the re-send request may of described codeword vector and when retransmitting with initialization from described signal receiving device
0) different message part S
0And parity check part P
1Then described signal receiving device receives the described codeword vector by described signal transmission apparatus retransmits, the codeword vector error correction that will receive by first decoder, will be through of the codeword vector combination of the codeword vector of the reception of error correction with the wherein wrong after testing initialization of buffering, and then detect possible mistake in the codeword vector of the reception of combination by second decoder.
In the description of front, when the NAK information that receives from described signal receiving device, the described signal that described signal transmission apparatus retransmits is corresponding with this NAK information.Yet, when any response of failing within the scheduled time after initialization to receive from described signal receiving device (, when failing to receive described ACK or NAK information), described sender unit can determine that the signal of described initialization makes mistakes and carry out signal repetition operation.
Thereby described sender unit and described signal receiving device are in predetermined number of retransmissions or repeatedly carry out signal transmission and the reception operation of III type based on HARQ in the given time, restore described k-position information vector up to normally.
As mentioned above, send and receive in the operation at the signal of III type based on HARQ, message part that the transmission when retransmitting of described sender unit is different with the codeword vector that has before sent and additional parity part (, new parity check part).Thereby described signal receiving device only uses the codeword vector of described repeating transmission just can normally restore described information vector.Also promptly, but described signal receiving device is self-demarking code.
As mentioned above, send and receive in the operation at the signal of III type based on HARQ, described sender unit must generate the codeword vector (n, k ') of supporting variable coding rate when retransmitting.Yet, according to the embodiments of the invention that wherein use structured LDPC code, described sender unit does not need to comprise and is used for generated codeword vector (n, k ') extra encoder, and described signal receiving device does not need to comprise the extra decoder that is used for decodes codeword vector (n, k ') yet.Can be in described signal sending and receiving device generate and decode and support the codeword vector (n, k ') of described variable coding rate by storing corresponding parity-check matrix simply.As a result, using structured LDPC code to make it possible to carry out the III type sends based on the signal of HARQ and receives operation and need not to increase hardware complexity.
Description by the front is appreciated that the signal that embodiments of the invention use structured LDPC code to carry out based on HARQ sends and the reception operation, makes it possible to carry out signal with lower hardware complexity in communication system and sends and receive.More particularly, embodiments of the invention make it possible to must to support therein carry out in the process based on the transmission of II type and III type HARQ scheme and received signal of variable coding rate signal and send and receive and do not need extra encoder.
Although showed and described the present invention with reference to its some preferred embodiments, those skilled in the art are to be understood that, under the prerequisite that does not deviate from the spirit and scope of the present invention that define by appended claims, can make various changes from form and details therein.
Claims (16)
1. method that is used for sending signal in communication system, the method comprising the steps of:
The information vector that reception will send;
Generate the first structured LDPC code word vector of the second portion that comprises the first that is mapped to described information vector and be mapped to parity vector by structured low density parity check LDPC encoding scheme that use the to support first encoding rate described information vector of encoding;
The described first structured LDPC code word vector is sent to signal receiving device;
When receiving this first structured LDPC code word vector, detect the mistake that occurs, generate the second structured LDPC code word vector of the third part of the additional parity vector that comprises described first, described second portion and be mapped to described information vector by using the structured LDPC encoding scheme of the supporting second encoding rate described information vector of encoding; And
At least one part of the described second structured LDPC code word vector is sent to described signal receiving device.
2. at least one part of the described second structured LDPC code word vector that is the method for claim 1, wherein sent is described third part.
3. at least one part of the described second structured LDPC code word vector that is the method for claim 1, wherein sent is described first and third part.
4. the method for claim 1, wherein, the structured LDPC encoding scheme of described first encoding rate of described support is based on the first sub-parity matrix, and the wherein said first sub-parity matrix generates based on close parity matrix according to described first encoding rate.
5. method as claimed in claim 4, wherein, the structured LDPC encoding scheme of described second encoding rate of described support is based on the second sub-parity matrix, and the wherein said second sub-parity matrix generates based on described close parity matrix according to described second encoding rate.
6. the structured LDPC encoding scheme of described first encoding rate of the method for claim 1, wherein described support be based on according to a plurality of parity matrixs of described first encoding rate one of them.
7. the structured LDPC encoding scheme of described second encoding rate of the method for claim 1, wherein described support be based on according to a plurality of parity matrixs of described second encoding rate one of them.
8. device that is used for sending signal in communication system, this device comprises:
Encoder, the first structured LDPC code word vector that is used to use the structured low density parity check LDPC encoding scheme coded message vector of supporting first encoding rate to comprise the first that is mapped to described information vector with generation and be mapped to the second portion of parity vector, and use the structured LDPC encoding scheme of supporting second encoding rate to encode described information vector and generate the second structured LDPC code word vector of the third part of the additional parity vector that comprises described first, described second portion and be mapped to described information vector;
Transmitter, be used for following one of them send to signal receiving device: at least one part of described first structured LDPC code word vector and the described second structured LDPC code word vector; And
Controller, be used for when initialization, carrying out to use supports the structured LDPC encoding scheme of described first encoding rate to encode described information vector the described first structured LDPC code word vector is sent to the control operation of described signal receiving device, and when receiving this first structured LDPC code word vector, detect the mistake that occurs, use the structured LDPC encoding scheme of the supporting described second encoding rate described information vector of encoding to send to described signal receiving device with described at least one part with the described second structured LDPC code word vector.
9. device as claimed in claim 8, wherein, at least one part of the described second structured LDPC code word vector that is sent is described third part.
10. device as claimed in claim 8, wherein, at least one part of the described second structured LDPC code word vector that is sent is described first and third part.
11. device as claimed in claim 8, wherein, the structured LDPC encoding scheme of described first encoding rate of described support is based on the first sub-parity matrix, and the wherein said first sub-parity matrix is based on that close parity matrix according to described first encoding rate generates.
12. device as claimed in claim 11, wherein, the structured LDPC encoding scheme of described second encoding rate of described support is based on the second sub-parity matrix, and the wherein said second sub-parity matrix is based on that described close parity matrix according to described second encoding rate generates.
13. device as claimed in claim 8, wherein, the structured LDPC encoding scheme of described first encoding rate of described support be based on according to a plurality of parity matrixs of described first encoding rate one of them.
14. device as claimed in claim 8, wherein, the structured LDPC encoding scheme of described second encoding rate of described support be based on according to a plurality of parity matrixs of described second encoding rate one of them.
15. a method that is used in the communication system received signal, the method comprising the steps of:
Use the decoding scheme corresponding with the signal decoding that receives with the structured low density parity check LDPC encoding scheme of employed support first encoding rate in the sender unit;
Whether wrongly determine in the signal of this reception;
When mistake occurring in the signal that detects this reception, send the information that occurs described mistake in the signal of indicating this reception to described sender unit;
If after the described information that sends the described mistake of indication appearance to described sender unit, receive signal, signal and the described signal combination that the reception of mistake is arranged through check that then will this current reception, use the decoding scheme corresponding with this composite signal decoding, and determine whether this is wrong in the composite signal of decoding with the structured LDPC encoding scheme of employed support second encoding rate in the described sender unit; And
When in detecting this composite signal, mistake occurring, send the information that occurs described mistake in this composite signal of indication to described sender unit;
When in not detecting this composite signal, mistake occurring, export this composite signal as information vector.
16. a device that is used in the communication system received signal, this device comprises:
Decoder, be used for using the decoding scheme corresponding with the signal decoding that receives with the structured low density parity check LDPC encoding scheme of employed support first encoding rate of sender unit, with the signal that receives subsequently and storage wherein through check the signal combination of the previous reception of mistake is arranged, and the use decoding scheme corresponding with the structured LDPC encoding scheme of employed support second encoding rate in the described sender unit decoded this composite signal; And
Controller, be used for when detecting this through signal wrong of the reception of decoding, execution sends the control operation that indication detects the information of described mistake to described sender unit, and be used for when not detecting this through signal wrong of the reception of decoding, export this through the signal of the reception of decoding as information vector.
Applications Claiming Priority (3)
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|---|---|---|---|
| KR20040118320 | 2004-12-31 | ||
| KR1020040118320 | 2004-12-31 | ||
| KR1020050134430 | 2005-12-29 |
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|---|---|
| CN101095303A true CN101095303A (en) | 2007-12-26 |
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|---|---|---|---|
| CN 200580045639 Pending CN101095303A (en) | 2004-12-31 | 2005-12-30 | Apparatus and method for transmitting and receiving a signal in a communication system |
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| Country | Link |
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| JP (1) | JP2008526159A (en) |
| KR (1) | KR100663469B1 (en) |
| CN (1) | CN101095303A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018121248A1 (en) * | 2016-12-26 | 2018-07-05 | 华为技术有限公司 | Data transmission method, data transmitting device and data receiving device |
| US10355711B2 (en) | 2014-12-30 | 2019-07-16 | Huawei Technologies Co., Ltd. | Data processing method and system based on quasi-cyclic LDPC |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101015764B1 (en) * | 2006-10-02 | 2011-02-22 | 삼성전자주식회사 | Apparatus and method for a transmitting/receiving signal in a communication system |
| JP2010199811A (en) * | 2009-02-24 | 2010-09-09 | Fanuc Ltd | Memory system of controller |
| US9485061B2 (en) * | 2012-10-12 | 2016-11-01 | Samsung Electronics Co., Ltd. | Communication system with flexible repeat-response mechanism and method of operation thereof |
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| US7702986B2 (en) * | 2002-11-18 | 2010-04-20 | Qualcomm Incorporated | Rate-compatible LDPC codes |
| US7813322B2 (en) * | 2003-02-19 | 2010-10-12 | Qualcomm Incorporated | Efficient automatic repeat request methods and apparatus |
| EP1628427B1 (en) * | 2003-05-28 | 2010-05-05 | Mitsubishi Denki Kabushiki Kaisha | Re-transmission control method and communication device |
-
2005
- 2005-12-29 KR KR20050134430A patent/KR100663469B1/en not_active IP Right Cessation
- 2005-12-30 JP JP2007549272A patent/JP2008526159A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10355711B2 (en) | 2014-12-30 | 2019-07-16 | Huawei Technologies Co., Ltd. | Data processing method and system based on quasi-cyclic LDPC |
| WO2018121248A1 (en) * | 2016-12-26 | 2018-07-05 | 华为技术有限公司 | Data transmission method, data transmitting device and data receiving device |
| US10938514B2 (en) | 2016-12-26 | 2021-03-02 | Huawei Technologies Co., Ltd. | Data transmission method, data sending device, and data receiving device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060079118A (en) | 2006-07-05 |
| KR100663469B1 (en) | 2007-02-28 |
| JP2008526159A (en) | 2008-07-17 |
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