CN101820306B - Signal relaying method and signal combining method and device - Google Patents
Signal relaying method and signal combining method and device Download PDFInfo
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- CN101820306B CN101820306B CN 200910078190 CN200910078190A CN101820306B CN 101820306 B CN101820306 B CN 101820306B CN 200910078190 CN200910078190 CN 200910078190 CN 200910078190 A CN200910078190 A CN 200910078190A CN 101820306 B CN101820306 B CN 101820306B
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Abstract
The invention discloses a signal relaying method, a signal combining method and a signal combining device. The signal relaying method comprises the following steps that: a transmitter sends a signal carrying a transmission code word which comprises a system bit and a verification bit; and a relay point adopts a coding mode which is identical with that of the transmitter and selects a verification bit which is different from that of the transmitter to forward an DF. The signal combining method comprises the following steps of: when signals are combined at a receiver, demodulating a direct signal transmitted by the transmitter and a forwarding signal of the relay point; and combining the system bits in the transmission code words carried by the direct signal and the forwarding signal and jointing the verification bits in the transmission code words carried by the direct signal and the forwarding signal, wherein the combined system bit and the jointed verification bit form a receiving code word. The code rate of the code word after the combination at the receiver is lower than the transmission code rate at the transmitter, and thus, extra coding gain can be obtained.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the signal trunking method in wireless communication procedure, signal combining method and the corresponding device of receiving terminal.
Background technology
One of core technology of LTE-Advanced system as the relaying technique (Relay) of target to improve link capacity, to enlarge the residential quarter area coverage.By the wireless signal of relay station (Relay Node, RN) relay base station (eNB) with user (UE), make the coverage of eNB effectively to be expanded.Relay station amplifies rear forwarding to received signal, can compensate the propagation loss of wireless signal, improves the received signal power of eNB or UE, improves wireless link capacity.
According to relay station different disposal to received signal, relay station can be divided into: repeat (repeater) relay station, amplify and forward (Amplify-and-Forward, AF) relay station and decoding and forward (Decode-and-Forward, DF) relay station.The Repeater relay station is amplify and forward at radio frequency to received signal, and relay station is simple in structure, the processing delay less.Because the signal processing is very simple, can not effectively suppress interference and noise, so the poor-performing of repeater relay station.The AF relay station will receive signal and transform to base band, but not demodulation, decoding.In the LTE system, the AF relay station can carry out sub-carrier selection to received signal, and only forwards effective subcarrier, can not forward for the subcarrier of non-object UE.For above-mentioned reasons, the AF relay station can effectively reduce the lifting that the relay wireless signal disturbs adjacent cell, and systematic function is better than the repeater relay station.The DF relay station will receive signal and transform to base band, and demodulation, decoding.If the CRC check of decoding output sequence is correct, the DF relay station is to decoding output sequence recompile, the rear forwarding of modulation; If the CRC check of decoding output sequence is incorrect, the DF relay station no longer forwards.The DF relay station all wants complicated than AF relay station and repeater relay station, and processing delay is also maximum, but the performance of DF relay station is best.Due to demodulation coding, the DF relay station can effectively avoid AF relay station and repeater relay station to the amplification of Noise and Interference, at eNB or UE place, receive signal signal to interference and noise ratio (SINR) be improved significantly, so link performance is best.
In the LTE-Advanced system, relay station mainly contains two kinds of application scenarioss, is respectively: enlarge cell coverage area and improve link capacity.For the application scenarios that enlarges cell coverage area, mobile terminal (UE) or base station only can receive the wireless signal that forwards from relay station, do not have tie link between UE and base station.For the application scenarios that improves link capacity, UE (or base station) not only can receive the wireless signal that forwards from relay station, also can receive the through wireless signal from base station (or UE).Network topology as shown in Figure 1.In order to improve the reliability of communication link, UE (or base station) can merge the signal with relay station from base station (or UE), thereby obtains space diversity gain.
Due to the premium properties of DF forwarding mechanism, the DF relay station is more favored in the LTE-Advanced system.The LTE system has adopted advanced Turbo coding and decoding scheme.Turbo code coding flow process as shown in Figure 2.In order to improve the validity of communication system, encoder is exported original Turbo coding and has been carried out punching processing, that is: the corresponding function of " bit selection " unit in Fig. 2.After bit was selected, encoder was only selected part redundancy check bit protection systematic bits, and redundancy overhead reduces, and system effectiveness is improved.
Under the application scenarios that improves link capacity, traditional DF relay station does not take full advantage of Turbo encoder " bit selection " function, the check bit that forwards is identical with the check bit of first emission, so only can obtain space diversity gain, and can not provide more coding gain for system.Fig. 3 illustrates the limitation of traditional DF forwarding mechanism take down link as example.In Fig. 3, base station (eNB) wireless signal emission (carry emission code word) is given mobile terminal (UE) and relay station (RN), launches to comprise systematic bits position and check bit position in code word.RN (being the DF relay station) transforms to base band with the wireless signal that receives, and demodulation, decoding.If the CRC check of decoding output sequence is correct, RN to decoding output sequence recompile, the modulation after be transmitted to UE.Wherein, comprised in the emission code word after recompile and systematic bits position identical from the emission code word of eNB reception and identical check bit position.At receiving terminal, after the forward signal that the direct signal that UE sends the base station and relay station are sent merges, detect decoding, thereby can obtain space diversity gain.This merging can be that high specific merges (Maximum ratio combination, MRC), can be also that likelihood ratio merges (Log-likelihood ratio, LLR).
To sum up analyze, under the application scenarios that improves network capacity, traditional DF forwarding mechanism does not take full advantage of relay station and forwards the degree of freedom of bringing, receiving terminal only can merge by the high specific of direct signal and forward signal or likelihood ratio merges the acquisition space diversity gain, does not obtain extra coding gain.
Summary of the invention
The invention provides a kind of signal trunking method, signal combining method and device, make improving under the scene of link capacity by the signal relaying, not only obtain space diversity gain, can also obtain extra coding gain.
Signal trunking method provided by the invention comprises:
Receive transmitting terminal signal and demodulation, the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding;
Adopt the coded system identical with described the first emission code word to encode to the decoding output sequence, generate the second emission code word; Described the second emission comprises described systematic bits position and second portion check bit position in code word;
To being transmitted to receiving terminal after described the second transmitter code tone of Chinese characters system.
Signal combining method provided by the invention comprises:
Receive transmitting terminal signal and demodulation, obtain the first emission code word that comprises systematic bits position and first's check bit position after demodulation; And
Receive relay station forward signal and demodulation, obtain the second emission code word that comprises described systematic bits position and second portion check bit position after demodulation; Wherein, described relay station forward signal is after receiving described transmitting terminal signal and demodulation by described relay station, and the first emission code word that comprises systematic bits position and first's check bit position is carried out decoding; And adopt the coded system identical with described the first emission code word to encode and generate to the decoding output sequence to comprise described systematic bits position and code word is launched in second portion check bit position second, then to generating after described the second transmitter code tone of Chinese characters system;
Merge the described systematic bits position in described the first emission code word and described the second emission code word, and splice first's check bit position and second portion check bit position in described the first emission code word and described the second emission code word, the corresponding code word after being merged.
The present invention also provides a kind of relay station, comprising:
Signal processing unit be used for to receive transmitting terminal signal and demodulation, and the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding;
Coding unit is used for adopting the coded system identical with described the first emission code word to encode to the decoding output sequence, generates the second emission code word; Described the second emission comprises described systematic bits position and second portion check bit position in code word;
Retransmission unit is used for being transmitted to receiving terminal after described the second transmitter code tone of Chinese characters system.
The present invention separately provides a kind of signal combining means, comprising:
The first reception ﹠ disposal unit is used for receiving transmitting terminal signal and demodulation, obtains the first emission code word that comprises systematic bits position and first's check bit position after demodulation;
The second reception ﹠ disposal unit is used for receiving relay station forward signal and demodulation, obtains the second emission code word that comprises described systematic bits position and second portion check bit position after demodulation; Wherein, described relay station forward signal is after receiving described transmitting terminal signal and demodulation by described relay station, and the first emission code word that comprises systematic bits position and first's check bit position is carried out decoding; And adopt the coded system identical with described the first emission code word to encode and generate to the decoding output sequence to comprise described systematic bits position and code word is launched in second portion check bit position second, then to generating after described the second transmitter code tone of Chinese characters system;
Merge cells, be used for merging the systematic bits position of described the first emission code word and described the second emission code word, and splice first's check bit position and second portion check bit position in described the first emission code word and described the second emission code word, the corresponding code word after being merged.
In the signal trunking method that the present invention adopts, relay station receives transmitting terminal signal and demodulation, and the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding; Adopt the coded system identical with described the first emission code word to encode to the decoding output sequence, generate and comprise second of described systematic bits position and second portion check bit position and launch code word; To being transmitted to receiving terminal after the second transmitter code tone of Chinese characters system.Receiving terminal merges the first emission code word and the systematic bits position from the second emission code word that relay station receives that receives from transmitting terminal, and splice first's check bit position and second portion check bit position in the first emission code word and the second emission code word, the corresponding code word after being merged.In corresponding code word due to receiving terminal after merging, have more redundancy check bit with respect to the first emission code word of transmitting terminal emission and (only comprise first's check bit position in the first emission code word; And the corresponding code word after merging has comprised first's check bit position and second portion check bit position), therefore, the code word code check after merging is lower, thereby can obtain extra coding gain.
Description of drawings
Fig. 1 is the application scenarios schematic diagram that the prior art relay station improves link capacity;
Fig. 2 is prior art Turbo code coding flow chart;
Fig. 3 is that prior art DF forwarding mechanism is at the signal processing flow that improves under the link capacity scene;
The signal trunking method flow chart that Fig. 4 provides for the embodiment of the present invention;
The signal combining method flow chart that Fig. 5 provides for the embodiment of the present invention;
The schematic flow sheet that Fig. 6 adopts the DF forwarding mechanism that wireless signal is processed for the signal trunking method that provides according to the embodiment of the present invention and signal combining method;
The relay station structural representation that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 is the coding unit internal structure schematic diagram in Fig. 7;
The signal combining means structural representation that Fig. 9 provides for the embodiment of the present invention.
Embodiment
The invention provides a kind of signal trunking method, signal combining method, relay station and signal combining means, make improving under the scene of link capacity by the signal relaying, can not only obtain space diversity gain, can also obtain extra coding gain.
Below in conjunction with accompanying drawing, with specific embodiment, method and apparatus provided by the invention is described in detail.
Embodiment 1: a kind of signal trunking method is provided.
Referring to Fig. 4, be the signal trunking method flow chart that the embodiment of the present invention 1 provides, concrete steps comprise:
Step S401, receive transmitting terminal signal and demodulation, the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding;
Step S402, adopt the coded system identical with the first emission code word to encode to the decoding output sequence, generate second and launch code word; Comprise the systematic bits position identical with the first emission code word and second portion check bit position in the second emission code word that generates;
Step S403, to being transmitted to receiving terminal after described the second transmitter code tone of Chinese characters system.
Above-mentioned trunking method is applicable to send to the signal of mobile terminal to carry out relay forwarding to the base station, also is adapted to send to the signal of base station to carry out relay forwarding to mobile terminal.Namely be adapted to the signal relaying of Uplink/Downlink in the existing communication system.
In one embodiment, first's check bit position and the position employing of second portion check bit be different check bit positions all.
In another embodiment, part different check bit position is adopted in first's check bit position and second portion check bit position.Also namely: in first's check bit position and second portion check bit position, have identical a part of check bit position, another part check bit position is different.
In order to improve the efficient of wireless system, reduce redundancy overhead, no matter be first's check bit position, or second portion check bit position, can be only a part of check bit position in whole redundancy check bits.
The concrete amount of bits of first's check bit position and second portion check bit position can be selected and change according to the transmission rate of system requirements.And can there is no certain quantity restricting relation between the two yet.
In order to make receiving terminal to splice the first emission code word of receiving from transmitting terminal and the check bit position from the second emission code word that relay station receives, make receiving terminal obtain more redundancy check bit and reduce to reach the purpose that code check obtains coding gain, after relay station need to adopt the identical coded system of the coded system corresponding with the first emission code word (being the coded system that transmitting terminal adopts) to decoding, the correct decoding output sequence of verification is encoded again.But due to the Radio Link between base station and relay station, and the Radio Link between relay station and mobile terminal is separate, so two-hop link can adopt mutually different modulation system, can certainly adopt identical modulation system.Also namely: be transmitted to receiving terminal after can adopting the modulation system identical with the transmitting terminal signal to the second transmitter code tone of Chinese characters system in the inventive method; Be transmitted to receiving terminal after perhaps adopting the modulation system different from the transmitting terminal signal to the second transmitter code tone of Chinese characters system.
Embodiment 2: a kind of signal combining method is provided.
According to the signal trunking method that the above embodiment of the present invention 1 provides, the embodiment of the present invention 2 provides a kind of corresponding signal combining method, and concrete steps comprise as shown in Figure 5:
Step S501, receive transmitting terminal signal and demodulation, obtain the first emission code word that comprises systematic bits position and first's check bit position after demodulation;
Step S502, receive relay station forward signal and demodulation, obtain the second emission code word that comprises described systematic bits position and second portion check bit position after demodulation;
Step S503, merge the systematic bits position in the first emission code word and the second emission code word, and splice first's check bit position and second portion check bit position in the first emission code word and the second emission code word, the corresponding code word after being merged.
Above-mentioned steps S501 and step S502 do not have temporal sequencing, for receiving terminal, as long as signal or the data that send to self detected, all can start reception.
Above-mentioned steps S502, receiving terminal receives the forward signal of relay station, as described in example 1 above, the relay station forward signal is after receiving transmitting terminal signal and demodulation by relay station, and the first emission code word that comprises systematic bits position and first's check bit position of transmitting terminal emission is carried out decoding; And adopt the coded system identical with the first emission code word to encode to the decoding output sequence, and generate and comprise identical systems bit and second portion check bit position the second emission code word, then generate after the second transmitter code tone of Chinese characters system to generation.
As described in example 1 above, relay station is underway to continue when forwarding, and is transmitted to receiving terminal after can adopting the modulation system identical from the transmitting terminal signal or different modulation system to the second transmitter code tone of Chinese characters system; Therefore, at receiving terminal, when judging modulation system corresponding to transmitting terminal signal and relay station forward signal when identical, can adopt high specific to merge the merging mode that (MRC) or likelihood ratio merge (LLR) and merge the first emission code word of reception and the systematic bits position in the second emission code word; When judging modulation system corresponding to transmitting terminal signal and relay station forward signal not simultaneously, can only adopt LLR merging mode to merge the first emission code word of reception and the systematic bits position in the second emission code word.
Signal combining method in the embodiment of the present invention 2 is different from the essence of prior art to be: only merge the systematic bits position in the first emission code word and the second emission code word, to adopt first's check bit position of comprising in splicing the first emission code word and the second emission code word and second portion check bit position for the check bit position, the corresponding code word that is gone out to receive by the systematic bits position after merging and spliced check bit bit combination.wherein, first's check bit position that splicing the first emission code word and the second emission comprise in code word and second portion check bit position, obtain spliced check bit position, essence is exactly: according to corresponding value " 0 " or " 1 " and each check bit sorting position in code word after coding of each check bit in the first emission code word, and according to corresponding value " 0 " or " 1 " and each check bit sorting position in code word after coding of each check bit in the second emission code word, the locational corresponding bit of same row order of determining in the corresponding code word of reception is check bit, and value " 0 " or " 1 " of filling out the check bit corresponding with sorting position.For example: the code length of supposing the first emission code word is 20 bits, and wherein front 10 bits are systematic bits, and rear 10 bits are check bit; Suppose that in the code word after transmitting terminal is encoded at first, essence includes 30 bits, wherein rear 20 bits are check bit, the corresponding bit position is respectively: 10010011000110110011, the first emission code word is chosen wherein front 10 check bits as first's check bit position, be that first's check bit position is respectively 1001001100, its sorting position in code word after coding is the 11st to the 20th (front 10 bits after coding in code word are systematic bits); The above-mentioned signal trunking method that provides according to the present invention, in after encoding again in the suppose relay station second emission code word, choose after coding rear 10 check bits in code word as second portion check bit position, be that second portion check bit position is respectively 0110110011, its sorting position in code word after coding is the 21st to the 30th.Carry out after the check bit position sockets at receiving terminal, obtain totally 20 of spliced check bit positions, namely 10010011000110110011, arranged in sequence is in the 11-30 position of the corresponding code word that receives.
The signal combining method that provides according to the embodiment of the present invention 2, in corresponding code word due to receiving terminal after merging, have more redundancy check bit with respect to the first emission code word of transmitting terminal emission and (only comprise first's check bit position in the first emission code word; And the corresponding code word after merging has comprised first's check bit position and second portion check bit position), therefore, the code word code check after merging is lower, thereby can obtain extra coding gain.Adopt above-mentioned example, the code check of transmitting terminal is the quantity of systematic bits position in the first emission code word divided by the code length of the first emission code word (namely in the first emission code word, the systematic bits bit quantity adds the quantity of first's check bit position), and the code check that obtains correspondence is 10/20=1/2; Receiving terminal is after merging, and corresponding code check is 10/30=1/3.Therefore, the code word code check after receiving terminal merges is lower, thereby has obtained extra coding gain.And obtain extra coding gain, can be so that whole communication system under the prerequisite that guarantees the identical systems performance, reduces transmitting power; In other words, when using equal transmit power, can reduce the communication error rate, the elevator system performance.
According to signal trunking method and the signal combining method that the above embodiment of the present invention 1 and embodiment 2 provide respectively, adopt the DF forwarding mechanism to the handling process schematic diagram embodiment (take down link as example) of wireless signal as shown in Figure 6, wherein:
Base station (eNB) wireless signal emission (carry first emission code word) is given mobile terminal (UE) and relay station (RN), and first launches and comprise systematic bits position and first's check bit position in code word.RN (being the DF relay station) transforms to base band with the wireless signal that receives, and demodulation, decoding.If the CRC check of decoding output sequence is correct, RN is transmitted to UE after the decoding output sequence is adopted recompile, modulation.Wherein, RN adopts the coded system identical with eNB to carry out recompile, has comprised in the emission code word after the RN recompile and systematic bits position identical from the emission code word of eNB reception and second portion check bit position.Wherein, second portion check bit position can be all different from first's check bit position, also can only have part different.At receiving terminal, the forward signal that the direct signal that UE sends eNB and RN send merges, be specially: merge the systematic bits position in the first emission code word and the second emission code word, and splice first's check bit position and second portion check bit position in the first emission code word and the second emission code word, according to the systematic bits position after merging and spliced check bit position, the corresponding code word that obtains receiving.Have more redundancy check bit in the corresponding code word that obtains due to receiving terminal, thereby make when obtaining space diversity gain, obtain extra coding gain.
Above-mentioned Fig. 6 is take down link as example, and for up link, its processing procedure is similar.Just transmitting terminal is UE, and receiving terminal is eNB, and the relay transfer method of RN is identical with down link.
One of ordinary skill in the art will appreciate that and realize that above-described embodiment 1 is to come the relevant hardware of instruction to complete by program with all or part of step in embodiment 2 methods, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
Embodiment 3: a kind of relay station is provided.
According to the signal trunking method that the above embodiment of the present invention 1 provides, based on same inventive concept, the embodiment of the present invention 3 provides a kind of relay station, and its structural representation comprises as shown in Figure 7:
In a kind of embodiment, the concrete structure of coding unit 72 comprises as shown in Figure 8:
Coded system is determined subelement 721, is used for determining corresponding coded system according to the first emission code word;
Chooser unit, check bit position 722 is used for choosing and whole different or second portion check bit position that part is different, first's check bit position;
Code word generates subelement 723, be used for adopting coded system to determine that the coded system that subelement 721 is determined encodes to the decoding output sequence, generate the second emission code word that comprises the second portion check bit position of the systematic bits position identical with the first emission code word and chooser unit, check bit position 722 choosing.
Embodiment 4: a kind of signal combining means is provided.
According to the signal combining method that the above embodiment of the present invention 2 provides, based on same inventive concept, the embodiment of the present invention 4 provides a kind of signal combining means, and its structural representation comprises as shown in Figure 9:
The first reception ﹠ disposal unit 91 is used for receiving transmitting terminal signal and demodulation, obtains the first emission code word that comprises systematic bits position and first's check bit position after demodulation;
The second reception ﹠ disposal unit 92 is used for receiving relay station forward signal and demodulation, obtains the second emission code word that comprises the systematic bits position identical with the first emission code word and second portion check bit position after demodulation; Wherein, the relay station forward signal adopts above-mentioned enforcement to fall 1 method and generates, and after namely receiving transmitting terminal signal and demodulation by relay station, the first emission code word that comprises systematic bits position and first's check bit position is carried out decoding; And adopt the coded system identical with the first emission code word to encode and generate to the decoding output sequence to comprise the identical systems bit and code word is launched in second portion check bit position second, then to generating after the second transmitter code tone of Chinese characters system;
Merge cells 93, be used for merging the first emission code word and second that receives and launch the systematic bits position of code word, and splice first's check bit position and second portion check bit position in the first emission code word and the second emission code word, the corresponding code word after being merged.
The signal combining means that the embodiment of the present invention 4 provides can be integrated in mobile terminal and in base station receiver equipment.
In sum, signal trunking method disclosed according to the embodiment of the present invention 1 and the disclosed relay station of embodiment 3, receive transmitting terminal signal and demodulation by relay station, the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding; Adopt the coded system identical with described the first emission code word to encode to the decoding output sequence, generate and comprise second of identical systems bit and second portion check bit position and launch code word; To being transmitted to receiving terminal after the second transmitter code tone of Chinese characters system.According to the embodiment of the present invention 2 and the disclosed signal combining method of embodiment 4 and device, by merging the first emission code word and the systematic bits position from the second emission code word that relay station receives that receives from transmitting terminal, and splice first's check bit position and second portion check bit position in the first emission code word and the second emission code word, the corresponding code word after being merged.In the corresponding code word after merging, launch code word with respect to first of transmitting terminal emission and have more redundancy check bit, therefore, the code word code check after merging is lower, thereby can obtain extra coding gain.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. a signal trunking method, is characterized in that, comprising:
Receive transmitting terminal signal and demodulation, the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding;
Adopt the coded system identical with described the first emission code word to encode to the decoding output sequence, generate the second emission code word; Described the second emission comprises described systematic bits position and second portion check bit position in code word, and described first's check bit position and described second portion check bit position are all different or part is different;
To being transmitted to receiving terminal after described the second transmitter code tone of Chinese characters system.
2. the method for claim 1, is characterized in that, described first's check bit position and described second portion check bit position are partial redundance check bit position.
3. method as claimed in claim 1 or 2, is characterized in that, to being transmitted to receiving terminal after described the second transmitter code tone of Chinese characters system, comprising:
Be transmitted to receiving terminal after adopting the modulation system identical with described transmitting terminal signal to described the second transmitter code tone of Chinese characters system; Perhaps
Be transmitted to receiving terminal after adopting the modulation system different from described transmitting terminal signal to described the second transmitter code tone of Chinese characters system.
4. a signal combining method, is characterized in that, comprising:
Receive transmitting terminal signal and demodulation, obtain the first emission code word that comprises systematic bits position and first's check bit position after demodulation; And
Receive relay station forward signal and demodulation, obtain the second emission code word that comprises described systematic bits position and second portion check bit position after demodulation; Wherein, described relay station forward signal is after receiving described transmitting terminal signal and demodulation by described relay station, and the first emission code word that comprises systematic bits position and first's check bit position is carried out decoding; And adopt the coded system identical with described the first emission code word to encode and generate to the decoding output sequence to comprise described systematic bits position and code word is launched in second portion check bit position second, then to generating after described the second transmitter code tone of Chinese characters system;
Merge the described systematic bits position in described the first emission code word and described the second emission code word, and splice first's check bit position and second portion check bit position in described the first emission code word and described the second emission code word, the corresponding code word after being merged.
5. method as claimed in claim 4, it is characterized in that, when modulation system corresponding to transmitting terminal signal and relay station forward signal is identical, adopts high specific merging MRC or likelihood ratio to merge LLR merging mode and merge described the first emission code word and the described second systematic bits position of launching in code word;
When transmitting terminal signal and modulation system corresponding to relay station forward signal not simultaneously, adopt LLR merging mode to merge systematic bits position in described the first emission code word and described the second emission code word.
6. method as described in claim 4 or 5, is characterized in that, described first's check bit position and the position employing of described second portion check bit be different check bit positions all; Or
Described first's check bit position and the different check bit position of employing part, described second portion check bit position.
7. a relay station, is characterized in that, comprising:
Signal processing unit be used for to receive transmitting terminal signal and demodulation, and the first emission code word that comprises systematic bits position and first's check bit position after demodulation is carried out decoding;
Coding unit is used for adopting the coded system identical with described the first emission code word to encode to the decoding output sequence, generates the second emission code word; Described the second emission comprises described systematic bits position and second portion check bit position in code word, and described first's check bit position and described second portion check bit position are all different or part is different;
Retransmission unit is used for being transmitted to receiving terminal after described the second transmitter code tone of Chinese characters system.
8. relay station as claimed in claim 7, is characterized in that, described coding unit comprises:
Coded system is determined subelement, is used for determining corresponding coded system according to the first emission code word;
Chooser unit, check bit position is used for choosing and whole different or second portion check bit position that part is different, described first's check bit position;
Code word generates subelement, be used for adopting described coded system to determine that the coded system that subelement is determined encodes to the decoding output sequence, generate the second emission code word of the described second portion check bit position that comprises described systematic bits position and described check bit position chooser unit selection.
9. a signal combining means, is characterized in that, comprising:
The first reception ﹠ disposal unit is used for receiving transmitting terminal signal and demodulation, obtains the first emission code word that comprises systematic bits position and first's check bit position after demodulation;
The second reception ﹠ disposal unit is used for receiving relay station forward signal and demodulation, obtains the second emission code word that comprises described systematic bits position and second portion check bit position after demodulation; Wherein, described relay station forward signal is after receiving described transmitting terminal signal and demodulation by described relay station, and the first emission code word that comprises systematic bits position and first's check bit position is carried out decoding; And adopt the coded system identical with described the first emission code word to encode and generate to the decoding output sequence to comprise described systematic bits position and code word is launched in second portion check bit position second, then to generating after described the second transmitter code tone of Chinese characters system;
Merge cells, be used for merging the systematic bits position of described the first emission code word and described the second emission code word, and splice first's check bit position and second portion check bit position in described the first emission code word and described the second emission code word, the corresponding code word after being merged.
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| CN1770741A (en) * | 2004-11-02 | 2006-05-10 | 日本电气株式会社 | Broadcast information transmission |
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