CN102474340A - Method and device for relaying - Google Patents
Method and device for relaying Download PDFInfo
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- CN102474340A CN102474340A CN2009801605935A CN200980160593A CN102474340A CN 102474340 A CN102474340 A CN 102474340A CN 2009801605935 A CN2009801605935 A CN 2009801605935A CN 200980160593 A CN200980160593 A CN 200980160593A CN 102474340 A CN102474340 A CN 102474340A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15521—Ground-based stations combining by calculations packets received from different stations before transmitting the combined packets as part of network coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
Abstract
A method and device for relaying are provided. The method includes the following steps: the bit probability ratios of every encoded bit in the packets from multiple mobile terminals are softly combined to generate soft network encoding packet information; channel decoding is performed for the soft network encoding packet information to obtain network encoding packet; channel encoding and modulation are performed for the network encoding packet; the modulated network encoding packet is sent to base station. Application of the method and device can implement signal relaying with high resource utilization efficiency, and save nearly half operation complexity in relay device.
Description
Trunking method and its equipment technical field
The present invention relates to field of wireless transmission, more particularly to trunking method and its equipment.Background technology
In LTE-Advanced, relaying is considered as a kind of and supports high power capacity and the high important technology covered.In up-link, usual trunking is needed for multiple mobile terminals（UE) forwarding information, in traditional trunking is forwarded in the method by UE.When the UE amounts increase serviced, in time division multiplexing（TDM) in system, the delay grown very much will be caused by being forwarded by UE, and in frequency division multiplexing（FDM), it is necessary to which more frequency resources are used to forward in system.
Meanwhile, for DF, (decoding is forwarded）, it is necessary to carry out decoding and recompiling by UE to packet for relaying, channel decoder and channel encoder turn into the major complexity of trunk side.
Therefore a kind of more efficient relay forwarding mode is needed, the problem of to overcome above-mentioned.The content of the invention
Embodiments of the present invention propose a kind of trunking method and its equipment.
According to the one side of embodiment of the present invention there is provided a kind of trunking method, including：Bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals carries out soft merging, produces soft network code grouping information；Channel decoding is carried out to the soft network code grouping information, network code packet is obtained；Channel Coding and Modulation is carried out to network code packet；The network code packet after modulation is sent to base station.
According to the another aspect of embodiment of the present invention, it is proposed that one kind relaying signal processing method, including：The first bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals and from trunking carries out soft merging, produce the second bit log likelihood rate of each coded-bit of each mobile terminal in the packet from multiple mobile terminals, wherein, the packet from trunking is that the network code that the trunking carries out soft merging and obtained to the packet from the multiple mobile terminal is grouped；Channel decoding is carried out to the second bit log likelihood rate, the packet of each in the multiple mobile terminal is obtained.
According to the another aspect of embodiment of the present invention, it is proposed that a kind of trunking, including：Combining unit, carries out soft merging for the bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals, produces soft
Network code grouping information；Decoding unit, for carrying out channel decoding to the soft network code grouping information, obtains network code packet；Coding unit, for carrying out channel coding to network code packet；Modulating unit, for being modulated to the network code packet after channel coding；First transmitting element, is grouped for sending the network code after modulation to base station.
According to the another aspect of embodiment of the present invention, it is proposed that a kind of base station, including：Signal combining unit, soft merging is carried out for the first bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals and from trunking, produce the second bit log likelihood rate of each coded-bit of each mobile terminal in the packet from multiple mobile terminals, wherein, the packet from trunking is that the network code that the trunking carries out soft merging and obtained to the packet from the multiple mobile terminal is grouped；Channel decoding unit, for carrying out channel decoding to the second bit log likelihood rate, obtains the packet of each in the multiple mobile terminal.
According to the another further aspect of embodiment of the present invention, it is proposed that a kind of communication system, including above-described base station, relaying and multiple mobile terminals.
Technical scheme based on more than, due to sending two number evidences, the resource utilization for improving signal relaying of embodiments of the present invention in a system resource.Also, on trunking, the reception signal after soft merging only needs the channel of half to decode, channel coding computing again.Because channel decoder and channel encoder are the major complexities of trunk side, the trunking method in the present invention, relative to general decode-and-forward relay, can save nearly half computational complexity.Brief description of the drawings
According to the following description with reference to accompanying drawing, advantages of the present invention will become prone to understand, wherein：
Fig. 1 shows communication system schematic diagram according to the embodiment of the present invention；
Fig. 2 shows according to the embodiment of the present invention, the block diagram of the trunking shown in Fig. 1；Fig. 3 shows according to the embodiment of the present invention, the block diagram of the base station shown in Fig. 1；
Fig. 4 shows according to the embodiment of the present invention, the process chart of trunking side；
Fig. 5 shows according to the embodiment of the present invention, the process chart of base station side；
Fig. 6 shows the simplified diagram of flow chart shown in Fig. 5；
Fig. 7 shows the effect diagram of trunking method according to the embodiment of the present invention.Embodiment
With reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail, it is unnecessary details and function for the present invention to eliminate in the course of the description, to prevent the understanding of the present invention from causing to obscure.
In embodiments of the present invention, it is proposed that a kind of wireless communication system, as shown in figure 1, the system includes trunking as described below, base station and multiple mobile terminals（UE).
A kind of trunking is also proposed, as shown in Fig. 2 the base station includes combining unit 230, soft merging is carried out for the bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals, produces soft network code grouping information；Decoding unit 240, for carrying out channel decoding to soft network code grouping information, obtains network code packet；Coding unit 260, for carrying out channel coding to network code packet；Modulating unit 270, for being modulated to the network code packet after channel coding；First transmitting element 280, is grouped for sending the network code after modulation to base station.
The trunking also includes demodulating unit 220, for being demodulated to the packet from multiple mobile terminals, obtains the bit log likelihood rate of each coded-bit described in each packet.
The trunking also includes control unit 250, whether the channel decoding for judging to carry out soft network code grouping information is correct, if it is judged that being correct, the control soft network code grouping information decoded to channel of coding unit 260 re-starts channel coding.
The trunking also includes the first receiving unit 210, for receiving packet signal from multiple mobile terminals.It also proposed a kind of base station, as shown in Figure 3, the base station includes signal combining unit 230, soft merging is carried out for the first bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals and from trunking, produce the second bit log likelihood rate of each coded-bit of each mobile terminal in the packet from multiple mobile terminals, wherein, the packet from trunking is that the network code that trunking carries out soft merging and obtained to the packet from multiple mobile terminals is grouped；Channel decoding unit 240, for carrying out channel decoding to the second bit log likelihood rate, obtains the packet of each in multiple mobile terminals.
The base station also includes base station demodulating unit 220, for being demodulated to the packet from multiple mobile terminals and from trunking, obtains the first bit log likelihood rate of each coded-bit of each packet.
The base station also includes the first receiving unit 210, for receiving grouped data from multiple mobile terminals and trunking.
Although base station and the trunking of the embodiment of the present invention are described in the form of the functional module of separation above, but each component shown in Fig. 2 to Fig. 4 can realize that the multiple components shown can also be integrated in chip piece or an equipment in actual applications with multiple devices in actual applications.The base station and trunking may also comprise
Any unit and device for other purposes.
With reference to Fig. 4 and Fig. 5, the base station provided embodiments of the present invention and the function of trunking are further elaborated.
Fig. 4 is the flow chart of trunking side trunking method.As shown in figure 4, first, in step 410, the first receiving unit 210 of trunking receives the packet from multiple UE.By taking two UE as an example, what trunking was received is grouped into：
Wherein, S S2It is the symbol that UE1 and UE2 is sent respectively, and/RIt is the fading channel model of UE1 and UE2 to trunking respectively, ^ and ^^ are independent identically distributed white Gaussian noise on these channels, its side σ.
At step 420, the demodulating unit 220 of trunking is demodulated to the multiple packets received respectively.The first symbol 8 sent with UE1, exemplified by, first, according to formula（3) the symbol likelihood ratio calculated
Wherein,SliIt is each probable value of symbol under current modulation mode.For example, for QPSK, i=l ~ 4.Then, according to formula（4) symbol 3, the bit log likelihood rate of middle j bits are calculated（LLRb ) :
(4) wherein, j, k are the number of coded bits that each symbol may be included, j, ^l ..., log2(max (i)), for QPSK codings, j, k=l, 2.
Similarly, identical processing is also done to the symbol received from UE2.
In step 430, the likelihood ratio of the multiple UE obtained after the demodulation of 230 pairs of the combining unit of trunking packet carries out soft merging, produces soft network code grouping information, is P1 P2 to simulate the signal received, rather than P1 and P2.
Assuming that the packet received is PNC=P1 P2, then being grouped PNCIn a network code bit bNCHave
Possibility as shown in table 1, wherein, for packet P!In a coded-bit, b2 be packet P2In the coded-bit corresponding with 1^, network code refers to encode the packet for coming the multiple sources of automatic network, and network code bit refers to the bit after network code.
Table 1 receives the various probable values of bit
b、 ^NC
0 0 0
0 1 1
1 0 1
1 1 0
, bNCLikelihood ratio such as formula（5) shown in, wherein, P1 and P2 are independent：
(5) on molecule and denominator divided by ^！^ bis-.^^!^:.^, obtains formula（6):
LLR{bNC)-log l + e LLR(b])+LLR[b2))(6) as can be seen that by equation（6), bit log likelihood rate when being grouped into P1 P2 received can be deduced when receiving Pl, P2.In embodiments of the present invention, according to formula（And formula 3)（4) P1 and P2 bit log likelihood rate has been respectively obtained, according to formula（6) built, P1 P2 bit log likelihood rate just can be obtained to represent P1 P2, gp, by formula（6) P1 and P2 is applied to by bit, and the signal represented by produced bit log likelihood rate sequence is equivalent to PI P2.
In this step, if the length of symbol is inconsistent, the length of most long symbol can be reached in shorter symbol afterbody filling complete zero or complete 1.
In step 440, the decoding unit 240 of trunking carries out channel decoding to soft network code grouping information.This step for pair(e) channel decoding is carried out, as it was previously stated, in the case where trunking is properly received, decoded obtained packet should be P1 P2.
In step 450, the control unit 250 of trunking judges whether correctly to have carried out channel decoding.In this step, CRC check code can be used for judging whether channel decoding is correct.It is the CRC check position can still be used for judgement decoding correctness after linear operation, network code due to network code.Certainly, it will be recognized by those skilled in the art that judging the channel decoding CRC check code whether correct mode is not limited to use in present embodiment.
If channel decoding is incorrect, in step 460, obtained packet conventionally is decoded to channel and relayed, for example, in AF (amplification forwardings）In relaying, channel is decoded to obtained packet;P1 and；P2 is amplified and forwarded.
If channel decoding is correct, in step 470,260 pairs of the coding unit of trunking decodes obtained network code packet and re-starts channel coding, and is modulated in step 480 by modulator 270, is transmitted in step 490 by the first transmitting element 280.
In above-mentioned technical scheme, skilled person will appreciate that, demodulating unit 220 and modulating unit 270 can be realized by monolithic chip, and decoding unit 240 and coding unit 260 can also be realized by monolithic chip.In the step of before step 490, the step of can also including the packet received is regenerated and/or amplified.
Fig. 5 is that base station side is directed to the flow chart that the packet signal relayed according to Fig. 4 method is handled.Illustrate the processing of base station side below by Fig. 5.
In step 510, the second receiving unit 310 of base station receives the signal from different UE and trunking respectively.As in the present embodiment, it is respectively received from UE1 and UE2：
Receive from trunking-
^, B bis-, B ^3+B (g) wherein, S^ S^n S3It is the symbol from UE1, UE2 and trunking transmission respectively ,/,2With,BIt is the fading channel model of UE1, UE2 and trunking to base station respectively,¾,、 ¾,2With¾BIt is the independent identically distributed white Gaussian noise introduced on these channels respectively, variance is σ2, and wherein, S3It is S^B S at trunking2Carry out the corresponding modulating symbol in soft merging and again the network code packet of channel coding modulation.
Packet Pl, P2 and P3 that in step 520,320 pairs of base station demodulating unit is received from UE1, UE2 and trunking respectively (S,> S2And S3Exemplary symbol respectively in Pl, P2 and P3, Pl, P2 and P3 are comprising many transmission symbols）The demodulation operation as performed by the step 420 at trunking is carried out, to obtain Pl, P2 and P3 the first coded-bit likelihood ratio ^^ respectively) and(6NC) sequence.
In step 530, Pl, P2 and P3 that 330 pairs of the signal combiner of base station is obtained likelihood ratio carry out soft merging.
By taking the second bit log likelihood rate of ^ in P1 as an example, after the signal respectively from UE1, UE2 and trunking is received, according to table 1, be calculated as below 6 in P1, the second bit log likelihood rate ^^) :
LlR{b ) _ )og Nc I c = 1] , = b, =0)+ P[yNc I = ]P(b, = l)P{b2 = l)
Pbnc I c = 0]p(bt = 0)p(b2 = 0)+P[yNC | 6NC = l]P(i», = 0)p{b2 = 1)
(9) wherein, b!、 b2And bNCAn example bit in Pl, P2 and P3 respectively, without loss of generality, can use packet in the first coded-bit for example bit.
In formula（9) on molecule and denominator simultaneously divided by
Obtain likelihood ratio by soft merging-
LlRib ) = exp(ziR(¾NC) + (6,))+ exp(Za(¾,)+ La(b2))
1 + exp ( R(6NC)"。( )
= L (b )+
One.、
(10)Wherein, R (e；) it is PNCIneThe first bit log likelihood rate, can in step 520 calculate and obtain)= logThe prior information that ^L^ means（In the present embodiment,n=l, 2), if herein it.、n/ 5It was not received by before P (b=θ), it is assumed that source has impartial probability, therefore, p (bn =l)=P(bn=0), L» .Due to having been received by b and b2, the posterior probability Rfe derived before use) and Z R () replace the prior information.Therefore, ili bj are changed into:
According to log (e fl +e ft)«max(i) approximation theory, can be to formula（11) carry out simplifying to reduce amount of calculation as follows：
LLR {b ) « LLR (6, ) + max (LLR (¾c), LLR ())-max (0, LLR (bNC ) + LLR (b2 ))
(12)
The second bit log likelihood rate JZi in P2() can also be produced by similar approach.
Then, in step 540, the channel decoder 340 of base station carries out channel decoding to the second bit log likelihood rate of each coded-bit in the signal after soft merging, and each information bit in packet P1 and packet P2 is obtained respectively.
Fig. 6 shows the brief flow that soft merging processing is carried out in base station side, wherein, the processing of step 610 and step 620 is the processing to P3 in step 520, for brevity, the processing to P1 and P2 is eliminated in Fig. 6, and step 630 and step 530 are identical, step 640 is identical with step 540.As shown in fig. 6, in order that carrying out soft merging with network code information, it is only necessary to increase equation（12) an extra pretreatment described in, i.e. Fig. 6
Middle step 630, when using max-log-MAP algorithms（Approximate data）When, the pretreatment has low-down complexity.
Next the technique effect of the technical scheme illustrated according to simulation result embodiment of the present invention is illustrated.In the simulation, it is assumed that channel is Rayleigh channel, Rayleigh fading has unit variance, is disturbed by white Gaussian noise.UE1 and UE2 have identical channel status, link between trunking-base station has the link identical channel status between UE- base stations, link-quality between UE- trunkings is better than the link-quality between UE- base station, channel coding uses length for the UMTS l/3Turbo codes of 3456 bits, and modulation type is QPSK.
Fig. 7 shows simulation result, in the figure 7, and transverse axis is signal to noise ratio（Eb/ No), the longitudinal axis is packet error rate (PER).As shown in fig. 7, improving with UE- repeated links, the technical scheme that embodiments of the present invention are proposed has gradually excellent performance relative to non-relay mode, and the performance levels off to traditional XOR network codes relaying.Because the purpose that relaying is laid is that it is some that UE- repeated links are better than UE- base station links to improve community marginal user performancedBIt is very common situation.In this case, it can use and propose that soft network code relaying substitutes XOR relayings in embodiments of the present invention, reach that XOR relays performance, and further save computational complexity.And at the same time, compared with traditional DF is relayed, the technical scheme that embodiments of the present invention are proposed is sent due to merging in the information for sending script in two parts of resources in a resource, 50% resource and transmission power have been saved.Also, on relay station, only need the channel of half to decode due to the soft network code information after soft merging, channel coding computing again, soft network code mode proposed by the invention can save the computational complexity of nearly half on relay station.
The technical scheme that embodiment of the present invention is proposed is not limited by wireless transmission method, whether frequency division, time-division, space division or code division mode, it differs only in resource difference used in transmission, and embodiments of the present invention can be used for various wireless transmitting systems by those skilled in the art easily according to specific wireless transmission method.
Although in embodiments of the present invention for simplicity, only having used two mobile terminals, however, those skilled in the art should be readily appreciated that, the technical scheme in embodiment of the present invention can also be realized using the mobile terminals of multiple two.In concrete implementation, UE1 and/or UE2 in embodiment of the present invention can also be substituted by other one/two relayings.
Those skilled in the art be should be readily recognized that, the different step of the above method can be realized by programmed computer.Here, some embodiments equally include machine readable or computer-readable program storage device（Such as, digital data storage medium）And the programmed instruction that encoding machine is executable or computer is executable, wherein, the instruction performs some or all steps of the above method.Deposited for example, program storage device can be digital storage, magnetic
Storage media（Such as Disk and tape）, hardware or readable digital data storage medium of light.Embodiment equally includes the programmed computer for performing the step of the above method.
Description and accompanying drawing only show the principle of the present invention.Thus, it will be appreciated that those skilled in the art can advise different structures, although these different structures are not expressly recited or shown here, but embody the principle of the present invention and be included within its spirit and scope.In addition, it is all referring herein to example be clearly mainly served only for teaching purpose to help reader to understand the design of promotion this area that the principle of the present invention and inventor are contributed, and should be interpreted it is not the limitation to these examples and condition that are specifically mentioned.In addition, all principle, the statement of aspect and embodiment and its specific examples for mentioning the present invention are comprising including its equivalent herein.
Above description is only used for realizing embodiments of the present invention; it should be appreciated by those skilled in the art; the any modification or partial replacement of the scope of the present invention is not being departed from; the scope that the claim of the present invention should be belonged to limit; therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (11)
1st, a kind of trunking method, including：
Bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals carries out soft merging, produces soft network code grouping information；
Channel decoding is carried out to the soft network code grouping information, network code packet is obtained；
Channel Coding and Modulation is carried out to network code packet；
The network code after modulation is sent to base station and weighs packet.
2nd, trunking method according to claim 1, in addition to, the packet from multiple mobile terminals is demodulated, the bit log likelihood rate of each coded-bit described in each packet is obtained.
3rd, trunking method according to claim 1, wherein, ask the described pair of packet from multiple mobile terminals be demodulated including：
Calculate the symbol likelihood ratio of each symbol of each packet from the multiple mobile terminal；The bit log likelihood rate of each coded-bit in each symbol according to being calculated the symbol likelihood ratio of each symbol calculated.
4th, trunking method according to claim 1, in addition to：
Judge whether correct to decode to the channel that the soft network code grouping information is carried out, if it is judged that being correct, the network code packet obtained after decoding channel carries out channel coding, if it is judged that being incorrect, execution amplification forwarding trunking plan.
5th, a kind of relaying signal processing method, including：
The first bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals and from trunking carries out soft merging, produce the second bit log likelihood rate of each coded-bit of each mobile terminal in the packet from multiple mobile terminals, wherein, the packet from trunking is that the network code that the trunking carries out soft merging and obtained to the packet from the multiple mobile terminal is grouped；
The second bit log likelihood rate is carried out to believe earnest decoding, the packet of each in the multiple mobile terminal is obtained.
6th, relaying signal processing method according to claim 5, in addition to：
Packet from multiple mobile terminals and from trunking is demodulated, the first bit log likelihood rate of each coded-bit of each packet is obtained.
7th, a kind of trunking, including：
Combining unit, carries out soft merging for the bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals, produces soft network code grouping information；
Decoding unit, for carrying out channel decoding to the soft network code grouping information, obtains network code packet；Coding unit, for carrying out channel coding to network code packet；
Modulating unit, for being modulated to the network code packet after channel coding；
First transmitting element, is grouped for sending the network code after modulation to base station.
8th, trunking according to claim 7, in addition to demodulating unit, for being demodulated to the packet from multiple mobile terminals, obtains the bit log likelihood rate of each coded-bit described in each packet.
9th, trunking according to claim 7, in addition to：
Whether control unit, the channel decoding for judging to carry out the soft network code grouping information is correct, if it is judged that being correct, control coding unit soft network code grouping information decoded to channel re-starts channel coding.
10th, a kind of base station, including-signal combining unit, soft merging is carried out for the first bit log likelihood rate to each coded-bit in the packet from multiple mobile terminals and from trunking, produce the second bit log likelihood rate of each coded-bit of each mobile terminal in the packet from multiple mobile terminals, wherein, the packet from trunking is that the network code that the trunking carries out soft merging and obtained to the packet from the multiple mobile terminal is grouped；
Channel decoding unit, for carrying out channel decoding to the second bit log likelihood rate, obtains the packet of each in the multiple mobile terminal.
11st, base station according to claim 10, in addition to：
Base station demodulating unit, for being demodulated to the packet from multiple mobile terminals and from trunking, obtains the first bit log likelihood rate of each coded-bit of each packet.
12nd, a kind of communication system, including the relaying according to any one of claim 7 to 9, the base station according to claim 10 or 11 and multiple mobile terminals.
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| CN1881965A (en) * | 2005-06-01 | 2006-12-20 | 株式会社Ntt都科摩 | Communication relay apparatus |
| CN101420291A (en) * | 2008-12-08 | 2009-04-29 | 北京邮电大学 | Combined decoding method for network and channel code in relay system |
| US20090213854A1 (en) * | 2008-02-21 | 2009-08-27 | Telcordia Technologies, Inc. | Efficient, fault-tolerant multicast networks via network coding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1881965A (en) * | 2005-06-01 | 2006-12-20 | 株式会社Ntt都科摩 | Communication relay apparatus |
| US20090213854A1 (en) * | 2008-02-21 | 2009-08-27 | Telcordia Technologies, Inc. | Efficient, fault-tolerant multicast networks via network coding |
| CN101420291A (en) * | 2008-12-08 | 2009-04-29 | 北京邮电大学 | Combined decoding method for network and channel code in relay system |
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| Title |
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| SHENGLI ZHANG, ET AL.: "soft network coding in wireless two-way relay channels", 《JOURNAL OF COMMUNICATION AND NETWORKS》 * |
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