CN100420177C - Mixed automatic retransmitting method - Google Patents
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- CN100420177C CN100420177C CNB2005100799922A CN200510079992A CN100420177C CN 100420177 C CN100420177 C CN 100420177C CN B2005100799922 A CNB2005100799922 A CN B2005100799922A CN 200510079992 A CN200510079992 A CN 200510079992A CN 100420177 C CN100420177 C CN 100420177C
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Abstract
This invention discloses a mixed automatic re-transmission method including: when a transmission party re-transmits data, it modulates data after constellation re-arrangement and transmits data to a receiving party, which demodulates data received after the constellation re-arrangement corresponding to the transmission party and merges and corrects mistakes to the demodulated data and the original received corresponding data so as to balance the data received S/N ratio of the receiving party to increase the decode performance.
Description
Technical field
The present invention relates to wireless communication technology field, be meant a kind of mixed automatic retransferring method especially.
Background technology
Used in IEEE 802.16 systems to mix and retransmitted (Hybrid Automatic RepeatRequest automatically, HARQ), HARQ is a kind of error correcting technique, the characteristics of the meaning of mixing (Hybrid) forward error correction (FEC) that has been this technological synthesis and re-transmission (ARQ) two kinds of methods.So-called FEC is meant at receiving terminal and the data of repeatedly transmitting acquisition can be merged error correction, and so-called the re-transmission automatically just requires a kind of transmission mechanism of retransmitting when (ARQ) is exactly a data transmission fails.
In the HARQ technology, chnnel coding was at first carried out to the data bit in the base station before sending data usually, after the data bit behind the coding interweaves by interleaver, carried out quadrature amplitude (QAM) modulation again, launched by data channel then.In receiving terminal reversed in order then, the data that receive are at first carried out the QAM demodulation, carry out deinterleaving and channel-decoding again, obtain data.
The QAM modulation is mapped to data based certain constellation sequence on the constellation exactly, and qam mode comprises Quadrature Phase Shift Keying (QPSK), 16QAM and 64QAM.With 16QAM qam mode is described below, in 16QAM, constellation mapping figure as shown in Figure 1, every four figures is according to being mapped on the point of constellation when modulating, for example one group of data 0100 when b2b3 (1 tunnel) modulates, is mapped to the some A among Fig. 1 with constellation sequence b0b1 (Q road).In the prior art, if the base station sends the packet failure that comprises these group data first, when repeat its transmission should be organized data, still shine upon this group data with b0b 1b2b3.Because for 16QAM, the recipient, the received signal to noise ratio that b1b3 is two will be higher than the received signal to noise ratio of two of b0b2, like this after repeat its transmission, the recipient is still with the original data of b0b1b2b3 mapping, thereby after data are merged error correction, just cause the received signal to noise ratio of the received signal to noise ratio of two corresponding datas of b1b3 far above two corresponding datas of b0b2, in other qam modes, exist the situation of some signal to noise ratio too far above the other position, thereby the data signal to noise ratio that has caused the recipient to receive is inhomogeneous, reduce decoding performance, thereby influenced throughput.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of mixed automatic retransferring method, signal to noise ratio that can balanced each bit data of recipient strengthens decoding performance, improves throughput.
In order to achieve the above object, the invention provides a kind of mixed automatic retransferring method, may further comprise the steps:
A, when transmit leg resends data,, and send data to the recipient through modulating data behind the constellation rearrangement;
After B, recipient receive described data, through the data that receive being carried out demodulation behind the constellation rearrangement corresponding, and the data that demodulate and the corresponding data of former reception are merged error correction with transmit leg; Wherein, described constellation rearrangement comprises:
Described transmit leg and recipient's constellation rearrangement information is preestablished by described transmit leg and described recipient, comprises the corresponding relation that preestablishes the M time re-transmission and constellation rearrangement, and described M is more than or equal to one; Or preestablishing the m time transmission and the corresponding relation of constellation sequence, described m is more than or equal to two;
Perhaps, described constellation rearrangement comprises:
Transmit leg is according to the parameter value that is provided with in self in advance and the corresponding relation of constellation rearrangement method before the step B, constellation rearrangement method corresponding parameters value assignment give is mixed the subdata bag indication parameter that retransmits automatically in the control signaling, and should mix re-transmission automatically and control signaling and send to the recipient;
Perhaps, described constellation rearrangement comprises:
In mixing automatic re-transmission control signaling, increase the constellation rearrangement identification parameter in advance before the step B, transmit leg is according to the parameter value that is provided with in self in advance and the corresponding relation of constellation rearrangement method, give described constellation rearrangement identification parameter with constellation rearrangement method corresponding parameters value assignment, and the mixing that will carry the constellation rearrangement identification parameter retransmits the control signaling automatically and sends to the recipient.
Preferably, the method for described constellation rearrangement is:
With I road and/or Q road constellation sequence at least one position that moves to left or move to right, or the low position of the position that received signal to noise ratio in I road and/or the Q road constellation sequence is high and received signal to noise ratio replaces, or with the negate in the constellation sequence, or above combination in any.
Described replace respectively corresponding high and low the method for received signal to noise ratio in I road and/or the Q road constellation sequence can for:
Replace the high and low position of N of received signal to noise ratio N in I road and/or the Q road constellation sequence respectively, described N is more than or equal to 1.
Described modulation can be: QPSK modulation, or the 16QAM modulation, or the 64QAM modulation.
From above scheme as can be seen, among the present invention, transmit leg is when resending data, modulate behind constellation rearrangement, the recipient is after the data that receive the transmit leg transmission, and it is preceding to constellation rearrangement to carry out demodulation, and the data that demodulate and the identical data of former reception are merged error correction, thereby balanced everybody Data Receiving signal to noise ratio of recipient has improved decoding performance, thereby has improved throughput;
Further specify this effect below by a simulation result figure behind application the present invention, as shown in Figure 2, for adopting Gaussian channel, 1/2 rate convolutional code, maximum retransmission is the present invention to be carried out the result of emulation at 4 o'clock, as can be seen from the figure, under the low situation of signal to noise ratio, the throughput behind the constellation rearrangement all is higher than the throughput when not adopting constellation rearrangement;
Among the present invention, transmit leg and recipient not only can preestablish the constellation rearrangement method of each re-transmission, can also constellation rearrangement information be sent to the recipient by transmit leg, the recipient determines constellation rearrangement method according to constellation rearrangement information, carries out constellation and separates mapping;
By the above-mentioned constellation rearrangement information of existing HARQ control signaling bear, can increase signaling among the present invention, reduce the signaling consumption of eating dishes without rice or wine;
Also by utilizing the existing reserved field in the existing HARQ control signaling to carry above-mentioned constellation rearrangement information, can increase the byte number of HARQ control signaling, thereby realize the present invention more easily among the present invention.
Description of drawings
Fig. 1 is a 16QAM modulation constellation mapping graph;
Fig. 2 is the simulated effect figure behind application the present invention;
Fig. 3 is an overview flow chart of the present invention;
Fig. 4 is the position view of constellation rearrangement among the present invention;
Fig. 5 is a 64QAM modulation constellation mapping graph.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Overall procedure of the present invention as shown in Figure 3, concrete steps are as follows:
After step 302, recipient receive described data, through the data that receive being carried out demodulation behind the constellation rearrangement corresponding, and the data that demodulate and the corresponding data of former reception are merged error correction with transmit leg.
Be illustrated in figure 4 as transmit leg and send before the data processing procedure to data, therefrom as can be seen, transmit leg is when resending data, and the modulating data planet seat that advances is reset.Carry out the concrete grammar of constellation rearrangement, can be that I road and/or Q road constellation sequence are moved to left or move to right at least one, or the low position of the position that received signal to noise ratio in I road and/or the Q road constellation sequence is high and received signal to noise ratio replaces, or with the negate in the constellation sequence.Situation by I road and Q road is an example respectively below, and the concrete example of these three kinds of methods in 16QAM modulation and 64QAM modulator approach further described, and the situation on I road or Q road similarly.In addition, the planisphere of 64QAM when adopting the 64QAM modulation, is mapped to per 6 bit data on the point of constellation as shown in Figure 5, and concrete mapping rule and 16QAM chopping phase are together.
First method is in the 16QAM modulation, be that b0b1b2b3 shines upon by the constellation sequence when supposing first transmission, wherein b0 and b1 are the Q road, b2 and b3 are the I road, shine upon by the constellation sequence b1b0b3b2 behind the constellation rearrangement when then transmitting for the second time, if also have transmission for the third time, shine upon according to b0b1b2b3 again, the rest may be inferred; In the 64QAM modulation, be that b0b1b2b3b4b5 shines upon by the constellation sequence when supposing first transmission, wherein b0, b1 and b2 are the Q road, b3, b4 and b5 position are the I road, shine upon by the constellation sequence b2b0b1b5b3b4 behind the constellation rearrangement when then transmitting for the second time,, then shine upon according to the constellation sequence b1b2b0b4b5b3 behind the constellation rearrangement if also have transmission for the third time, shine upon according to b0b1b2b3b4b5 again for the 4th time, and the like.
Second method is in the 16QAM modulation, be that b0b1b2b3 shines upon by the constellation sequence when supposing first transmission, wherein b0 and b1 are the Q road, b2 and b3 are the I road, wherein the received signal to noise ratio of two of b1 and b3 is higher than b0 and b2, then shines upon by the constellation sequence b1b0b3b2 behind the constellation rearrangement when transmitting for the second time, if also have transmission for the third time, shine upon by the constellation sequence b0b1b2b3 behind the constellation rearrangement again, and the like; In the 64QAM modulation, be that b0b1b2b3b4b5 shines upon by the constellation sequence when supposing first transmission, wherein b0, b1 and b2 are the Q road, b3, b4 and b5 position are the I road, and wherein the received signal to noise ratio of b5 and b2 is the highest, and b4 and b1 take second place, the received signal to noise ratio of b3 and b0 is minimum, by the constellation sequence b2b1b0b5b4b3 behind the constellation rearrangement, shine upon by the constellation sequence b0b1b2b3b4b5 behind the constellation rearrangement when transmitting for the third time when then transmitting for the second time, and the like.For greater than in the 64QAM modulator approach, when replacing, not only can be with the highest and minimum the replacing of signal to noise ratio of signal to noise ratio, can also be with signal to noise ratio time high and inferior low replacing, and with high once more and low once more the replacing of signal to noise ratio, and and the like.
The third method is in the 16QAM modulation, be that b0b1b2b3 shines upon by the constellation sequence when supposing first transmission, wherein b0 and b1 are the Q road, b2 and b3 are the I road, and for two of b0 and b2, and its value is respectively 0 and be at 1 o'clock, the received signal to noise ratio difference, then can be with the whole negates of this constellation sequence, or, come this received signal to noise ratio of two in the balanced repeatedly transmission only to b0 and two negates of b2.When modulating, only need determine 0 position different, when retransmitting, these positions or a whole position negate be got final product then, no longer illustrate here with 1 received signal to noise ratio for 64QAM.This kind method can also be united use with above-mentioned first kind and second method, for example adopts above-mentioned first kind or second method in transmission first and transmission for the second time, adopts this method in transmission for the third time with in transmitting for the 4th time.
In addition, in the above-mentioned steps 302, the recipient obtains the method for constellation rearrangement, can be that recipient and transmit leg are made an appointment, and also can transmit leg self constellation rearrangement information be sent to the recipient, and the recipient carries out constellation rearrangement according to this information.
In preceding a kind of mode of making an appointment, can be in advance the identical corresponding relation that retransmits for the M time with constellation rearrangement method be set in transmit leg and recipient, wherein M can be more than or equal to one.Equaling one with M is the example explanation, when M equals for the moment, is equivalent to appoint that the constellation sequence of the acquiescence of transmission use is for the first time carried out modulation and demodulation, uses when retransmitting by the constellation sequence after the constellation rearrangement method rearrangement of setting and carries out modulation and demodulation.
Also can set in advance the corresponding relation of the m time transmission and constellation sequence, for example, transmission for the first time is set in transmit leg and recipient in advance uses first kind of constellation sequence, second kind of constellation sequence used in transmission for the second time, the third constellation sequence is adopted in transmission for the third time ..., then carrying out QAM when modulation, carrying out constellation mapping according to the constellation sequence of the selection of times correspondence of this time transmission.
In addition, the constellation sequence and the even number time corresponding constellation sequence of transmission of odd number time transmission correspondence can also only be set in advance, when transmission, then select the constellation sequence of correspondence to carry out constellation mapping according to the parity of this time transmission.
A kind of transmit leg sends to self constellation rearrangement information in recipient's the mode in the back, transmit leg can be to utilize existing signaling to send constellation rearrangement information to the recipient, for example by HARQ control signaling (HARQ_Control_IE), be example with the control of the HARQ in IEEE 802.16 agreements signaling below, the method that transmits constellation rearrangement information by HARQ control signaling is elaborated.
HARQ signaling in IEEE 802.16 agreements is as shown in table 1, and when prefix (Prefix)=1, the HARQ signaling is a state of activation, and wherein packet indication (AI_SN) is used to indicate new and old packet; Channel logo (ACID) is the indication of HARQ channel; Subdata bag sign (SPID) is used for promptly, packet being divided into the subdata bag under incremental redundancy (IR) situation, when sending different subdata bags at every turn, and the each subdata bag that sends of indication, under other situations, shared two of SPID are for keeping the position.
| Grammer (syntax) | Figure place (Size, bits) | Mark (Notes) |
| HARQ_Control_IE() | - | - |
| Prefix (Prefix) | 1 | The interim invalid HARQ of 0=(Temporary disable HARQ) 1=HARQ is (enable HARQ) effectively |
| if(Prefix＝＝1){ | - | - |
| AI_SN | 1 | New old packet indication (HARQ ID Seq.No) |
| SPID/ keeps position (Reserved) | 2 | Subdata bag sign under the IR pattern; Otherwise for keeping position (Subpacket ID when IR is defined by the FEC mode, other wise reserved) (encoded 0b00) |
| ACID | 4 | HARQ channel indication (HARQ CH ID) |
| }else{ | - | - |
| reserved | 3 | Be changed to 0 (Shall be set to zero) |
| } | - | - |
| } | - | - |
Table 1
Among the present invention, constellation rearrangement information can realize by increase parameter in this signaling, also can realize by utilizing the reservation position in this signaling.
In preceding a kind of mode, HARQ signaling after the increase parameter can be as shown in table 2, as can be seen from Table 2, increased constellation rearrangement sign (CSID) parameter with respect to table 1, the figure place of distributing for this parameter is 2, in the control of the HARQ after guaranteeing to change signaling, byte number shared under the situation of Prefix=1 can be a nibble, keeps the position and gathers into nybble so increased by 2.Because the figure place of distributing for CSID is 2, this parameter can have four values, can distinguish corresponding different constellation sequences, for example table 3 has provided the corresponding relation of a kind of this parameter value and constellation sequence, this corresponding relation can be stored among transmit leg and the recipient in advance, constellation sequence after transmit leg is according to constellation rearrangement is determined the value of CSID in the HARQ control signaling, determines to carry out the constellation sequence of constellation rearrangement according to the value of this CSID that receives the recipient.Certainly, the constellation sequence of the different value correspondences of CSID parameter can be not yet with table 3 in identical, adopt in three kinds of mentioned among the present invention constellation rearrangements any, perhaps several in conjunction with selecting different constellation rearrangement modes; And the figure place of distributing for the CSID parameter can still less be 1, and then the CSID parameter has two values, 0 and 1, and corresponding different respectively constellation sequences; Also can be more, for example distribute three, then this parameter can have the corresponding different respectively constellation sequence of 8 values.
| Grammer (syntax) | Figure place (Size, bits) | Mark (Notes) |
| HARQ_Control_IE() | - | - |
| Prefix (Prefix) | 1 | The interim invalid HARQ of 0=(Temporary disable HARQ) 1=HARQ is (enable HARQ) effectively |
| if(Prefix＝＝1){ | - | - |
| AI_SN | 1 | New old packet indication (HARQ ID Seq.No) |
| SPID/ keeps position (Reserved) | 2 | Subdata bag sign under the IR pattern; Otherwise for keeping position (Subpacket ID when IR is defined by the FEC mode, other wise reserved) (encoded 0b00) |
| ACID | 4 | HARQ channel indication (HARQ CH ID) |
| CSID | 2 | Constellation rearrangement sign (Constellation version ID) |
| reserved | 2 | Be changed to 0 (shall be set to zero) |
| }else{ | - | - |
| reserved | 3 | Be changed to 0 (Shall be set to zero) |
| } | - | - |
| } | - | - |
Table 2
| CSID | | 64QAM | Notes | |
| 0 | b0b1b2b3 | b0b1b2b3b4b5 | ||
| 1 | b1b0b3b2 | b1b2b0b4b5b3 | ||
| 2 | b0b1b2b3 | b2b0b1b5b3b4 | B represents the negate to bit b | |
| 3 | b1b0b3b2 | b2b1b0b5b4b3 |
Table 3
In above-mentioned steps 301, transmit leg resends data and is meant that transmit leg is after not having of receiving that the recipient sends correctly receives the information of packet, resend this packet, because in this information, can carry the information of this packet, and can write down also at transmit leg whether certain packet has been repeated the number of times that sends or repeat to send, according to these information, transmit leg can be selected corresponding constellation rearrangement method from table 3, obtain the sequence behind the constellation rearrangement, when for example sending for the first time, adopting the CSID value is the sequence of 0 correspondence, for the second time adopting CSID value is the sequence of 1 correspondence, and adopting the CSID value for the third time is 2 o'clock sequence, and the 4th employing CSID value is 3 o'clock sequence.
In a kind of mode in back, after utilizing the reservation position transmission constellation rearrangement information in the HARQ control signaling, HARQ control signaling can be as shown in table 4, as can be seen from Table 4, with respect to table 1, utilized the SPID parameter that keeps under the non-IR situation, then under non-IR situation, shared two of SPID can have four values, can distinguish corresponding four kinds of constellation sortords, concrete corresponded manner can be selected flexibly, can realize with reference to above-mentioned explanation to CSID, no longer describes in detail here.Though in table 4 to the Chase pattern that is illustrated as of SPID and use the 16QAM modulation or the 64QAM modulation, in specific implementation of the present invention, do not limit non-IR pattern and be the Chase pattern, and modulation system also can be QPSK or than the 64QAM modulator approach of high-order more.
| Grammer (syntax) | Figure place (Size, bits) | Mark (Notes) |
| HARQ_Control_IE() | - | - |
| Prefix (Prefix) | 1 | The interim invalid HARQ of 0=(Temporary disable HARQ) 1=HARQ is (enable HARQ) effectively |
| if(Prefix＝＝1){ | - | - |
| AI_SN | 1 | New old packet indication (HARQ ID Seq.No) |
| SPID/reserved | 2 | Be subdata bag sign under the IR pattern; Chase pattern and use 16QAM or 64QAM when modulation identifies as constellation rearrangement, otherwise for keeping position (Subpacket ID when IR is defined by the FEC mode, Subpacket constellation version ID when chase is defined by the FEC mode with the modulation scheme to be 16QAM or 64QAM, otherwise reserved (encoded 0b00)) |
| ACID | 4 | HARQ channel indication (HARQ CH ID) |
| }else{ | - | - |
| reserved | 3 | Be changed to 0 (Shall be set to zero) |
| } | - | - |
| } | - | - |
Table 4
From the above description as can be seen, among the present invention, transmit leg is when resending data, modulate behind constellation rearrangement, the recipient is after the data that receive the transmit leg transmission, and it is preceding to constellation rearrangement to carry out demodulation, and the data that demodulate and the identical data of former reception are merged error correction, thereby balanced everybody Data Receiving signal to noise ratio of recipient has improved decoding performance, thereby has improved throughput; Among the present invention, transmit leg and recipient not only can preestablish the constellation rearrangement method of each re-transmission, can also constellation rearrangement information be sent to the recipient by transmit leg, the recipient determines constellation rearrangement method according to constellation rearrangement information, carries out constellation and separates mapping; By the above-mentioned constellation rearrangement information of existing HARQ control signaling bear, can increase signaling among the present invention, reduce the signaling consumption of eating dishes without rice or wine; Also by utilizing the existing reserved field in the existing HARQ control signaling to carry above-mentioned constellation rearrangement information, can increase the byte number of HARQ control signaling, thereby realize the present invention more easily among the present invention.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a mixed automatic retransferring method is characterized in that, this method may further comprise the steps:
A, when transmit leg resends data,, and send data to the recipient through modulating data behind the constellation rearrangement;
After B, recipient receive described data, through the data that receive being carried out demodulation behind the constellation rearrangement corresponding, and the data that demodulate and the corresponding data of former reception are merged error correction with transmit leg;
Described constellation rearrangement comprises:
Described transmit leg and recipient's constellation rearrangement information is preestablished by described transmit leg and described recipient, comprising: preestablish the corresponding relation of the M time re-transmission and constellation rearrangement, described M is more than or equal to one; Or preestablishing the m time transmission and the corresponding relation of constellation sequence, described m is more than or equal to two;
Perhaps, described constellation rearrangement comprises:
Transmit leg is according to the parameter value that is provided with in self in advance and the corresponding relation of constellation rearrangement method before the step B, constellation rearrangement method corresponding parameters value assignment give is mixed the subdata bag indication parameter that retransmits automatically in the control signaling, and should mix re-transmission automatically and control signaling and send to the recipient;
Perhaps, described constellation rearrangement comprises:
In mixing automatic re-transmission control signaling, increase the constellation rearrangement identification parameter in advance before the step B, transmit leg is according to the parameter value that is provided with in self in advance and the corresponding relation of constellation rearrangement method, give described constellation rearrangement identification parameter with constellation rearrangement method corresponding parameters value assignment, and the mixing that will carry the constellation rearrangement identification parameter retransmits the control signaling automatically and sends to the recipient.
2. method according to claim 1 is characterized in that, the method for described constellation rearrangement is:
With I road and/or Q road constellation sequence at least one position that moves to left or move to right, or the low position of the position that received signal to noise ratio in I road and/or the Q road constellation sequence is high and received signal to noise ratio replaces, or with the negate in the constellation sequence, or above combination in any.
3. method according to claim 2 is characterized in that, described method of replacing the position that the received signal to noise ratio correspondence is high and low in I road and/or the Q road constellation sequence respectively is:
Replace the high and low position of N of received signal to noise ratio N in I road and/or the Q road constellation sequence respectively, described N is more than or equal to 1.
4. according to claim 1,2 or 3 described methods, it is characterized in that described being modulated to: QPSK modulation, or 16QAM modulation, or 64QAM modulation.
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| CN101321045B (en) * | 2007-06-06 | 2012-04-04 | 中兴通讯股份有限公司 | Method for combining high-order non-uniform amplitude modulation signal |
| CN101867439B (en) * | 2009-04-17 | 2013-05-08 | 中兴通讯股份有限公司 | Indication method of bit mapping mode |
| CN102474399B (en) * | 2010-03-03 | 2014-11-26 | Lg电子株式会社 | Data processing method and apparatus for a HARQ operation |
| CN102137504B (en) * | 2011-04-12 | 2016-01-20 | 电信科学技术研究院 | A kind of method of dispatching transmission of multiple sub-frames and device |
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| CA2488267A1 (en) * | 2001-02-21 | 2002-08-29 | Matsushita Electric Industrial Co., Ltd. | Hybrid arq method with signal constellation rearrangement |
| CN1426641A (en) * | 2001-02-21 | 2003-06-25 | 松下电器产业株式会社 | Hybrid ARQ method with single constellation rearrangement |
| WO2004036817A1 (en) * | 2002-10-18 | 2004-04-29 | Matsushita Electric Industrial Co., Ltd. | Constellation rearrangement for transmit diversity schemes |
| WO2004057792A1 (en) * | 2002-12-23 | 2004-07-08 | Matsushita Electric Industrial Co., Ltd | Data retransmission method employing symbol rearrangement over the galois field |
| CN1620776A (en) * | 2002-10-18 | 2005-05-25 | 松下电器产业株式会社 | Constellation resetting of automatically repeat requesting transmitting diversity scheme |
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| CA2488267A1 (en) * | 2001-02-21 | 2002-08-29 | Matsushita Electric Industrial Co., Ltd. | Hybrid arq method with signal constellation rearrangement |
| CN1426641A (en) * | 2001-02-21 | 2003-06-25 | 松下电器产业株式会社 | Hybrid ARQ method with single constellation rearrangement |
| WO2004036817A1 (en) * | 2002-10-18 | 2004-04-29 | Matsushita Electric Industrial Co., Ltd. | Constellation rearrangement for transmit diversity schemes |
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| WO2004057792A1 (en) * | 2002-12-23 | 2004-07-08 | Matsushita Electric Industrial Co., Ltd | Data retransmission method employing symbol rearrangement over the galois field |
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