CN103457687A - Relaying method and device based on bit rearrangement - Google Patents

Abstract

Disclosed are a relaying method and device based on bit rearrangement. The invention provides a method for relaying multi-stage quadrature amplitude modulated signals sent by second equipment in first equipment in a wireless communication system, and the method includes receiving initial multi-stage quadrature amplitude modulated signals sent by the second equipment; decoding the signals to acquire initial a symbol sequence comprising at least one symbol comprising one bit sequence comprising a front part and a rear part which are different in reliability; rearranging the front part and rear part of the bit sequence to allow the position corresponding to the front part to contain at least one bit in the rear part and position corresponding to the rear part to contain at least one bit in the front part in the bit sequence in the symbol after rearranging; forming a rearranged symbol sequence according to the arranged symbol; coding the rearranged symbol sequence to acquire and send rearranged multi-stage quadrature amplitude modulated signals.

Description

A kind of relay transfer method and device based on bit rearrangement

Technical field

The present invention relates to wireless communication technology field, relate in particular to the relay cooperative transmission field.

Background technology

The relay cooperative transmission technology, as one of determined basic function of follow-up developments LTE-Advanced of LTE, received general concern.Its main feature is can make to be difficult to adopt the mobile terminal of multi-antenna technology to obtain the transmission diversity gain, overcomes thus the harmful effect of fading channel to wireless communication system.

The relay cooperative transmission method of using in existing 3G/LTE wireless communication system is mainly decode-and-forward relay (decode-and-forward is called for short DF).The repeating process of the method as shown in Figure 1, mainly comprise two stages: as shown in accompanying drawing 1 (a), in the first stage, a transmitting terminal (user terminal for example, UE) packet is sent to simultaneously receiving terminal (base station for example, (Relay Node, be called for short RN to eNB) He one via node, the RN here can be trunking, can be also another UE); As shown in accompanying drawing 1 (b), in second stage, RN decoded data packets recompile, then by the Packet Generation of recompile to receiving terminal, and at receiving terminal, using high specific to merge (maximal ratio combing is called for short MRC) method merges the signal received for twice decode and obtains the data that transmitting terminal transmits.

The subject matter of DF method is, due to what use in existing 3G/LTE system, be quadrature amplitude modulation (Quadrature Amplitude Modulation, be called for short QAM) mode, and according to the 3GPP standard selected modulation constellation, in symbol, the bit of diverse location has different reliabilities.Take 16QAM as example, and each symbol comprises 4 bit (b ₁b ₂b ₃b ₄), and the planisphere of 3GPP regulation is as shown in Figure 2.Can find out b ₁, b ₂the different values of the bit of position are distributed in different quadrants, can be distinguished by quadrant; And b ₃, b ₄the different values of the bit of position are distributed in same quadrant, must in quadrant, be distinguished.So b ₁, b ₂the bit of position has farther Euclidean distance, that is to say b ₁, b ₂the bit of position has higher reliability, and b ₃, b ₄the bit reliability of position is lower.And the DF method is the symbol same with transmitting terminal due to what use when forwarding, the bit that reliability is lower can further descend in reliability after forwarding, so its performance is limited to the bit that reliability is lower, i.e. b ₃, b ₄the error rate of the bit of position is the principal element that affects DF method overall bit-error rate.

The characteristics of bit reliability difference in modulating for multistage QAM in prior art, some technical schemes based on constellation rearrangement have been proposed accordingly for the reliability difference between balanced bit, the typical repeating method based on constellation rearrangement as used in HARQ.The method is passed through in receiving terminal and one group of same modulation constellation of Sender side Storage, and at transmitting terminal the feedback according to receiving terminal, when each the re-transmission, select different planispheres to be modulated, at receiving terminal, use corresponding planisphere to carry out demodulation, thereby balanced bit reliability difference, reach the purpose that reduces error of transmission.Yet this type of method based on constellation rearrangement also is not suitable for the practical application scene of current relay cooperative transmission.Main cause comprises: one, and need the feedback signal of corresponding control signal and receiving terminal to indicate how to carry out constellation rearrangement, and the cooperating relay transmission mode is direct forwarding, does not receive the step sent again after feedback; Two, existing 3GPP standard clear the planisphere that uses of each rank QAM modulation, planisphere outside operating specification may cause the hardware compatibility problem, these class methods require receiving terminal and RN to store all possible planisphere in addition, and a large advantage of cooperating relay transmission can be served as RN by a certain UE exactly, in the situation that serve as RN by UE, store the memory requirement that all possible planisphere has strengthened terminal equipment concerning UE, improved cost; Three, these class methods need to be found optimal constellation figure by complicated searching algorithm, have strengthened the requirement to the RN operational capability, equally also are not suitable for the situation that UE serves as RN.

For this reason, need a kind of new in the relay cooperative transmission process for the method for balanced QAM modulation symbol bit reliability difference, and the method should try one's best and compatiblely had standard now and be suitable for the situation that UE serves as RN.

Summary of the invention

For solving the aforementioned problems in the prior, the present invention proposes a kind of new retransmission method, before the RN forward signal, by the advanced rearrangement operation of the bit sequence in the QAM modulation symbol, by reliability, the bit of different positions is reset, and then is modulated and send.And at receiving terminal, the carrying out that the primary signal that receiving end/sending end sends and RN forward the signal of resetting, then use to merge method of estimation and decoded.

Particularly, according to a first aspect of the invention, propose the method for a kind of the first equipment repeating at wireless communication system by the multistage quadrature amplitude modulation signal of the second equipment transmission, comprised the following steps: received the initial multistage quadrature amplitude modulation signal sent from described the second equipment; The described initial multistage quadrature amplitude modulation signal of decoding obtains initial symbol sebolic addressing, described symbol sebolic addressing comprises at least one symbol, described symbol comprises a bit sequence, described bit sequence comprises front and rear, and the reliability of the bit of wherein said front portion is different from the reliability of the bit at described rear portion; Symbol after the described front portion of described bit sequence and described rear portion are reset, make in position corresponding with described front portion in the bit sequence in the symbol after described rearrangement and comprise the bit at least one described rear portion, and comprise the bit at least one described front portion in position corresponding to described rear portion; Form the symbol sebolic addressing after resetting with the symbol after described rearrangement; And the multistage quadrature amplitude modulation signal of the symbol sebolic addressing after the described rearrangement of encoding after being reset and send described rearrangement after multistage quadrature amplitude modulation signal.

Preferably, the described multistage quadrature amplitude modulation signal sent by the second equipment is 16QAM signal or 64QAM signal.

More preferably, when the length at described front portion and described rear portion is identical, described being rearranged to exchanged the bit at the bit of described front portion and described rear portion.

Preferably, described the first equipment is trunking or subscriber equipment.

According to a second aspect of the invention, proposed a kind of method that receives multistage quadrature amplitude modulation signal in the 3rd equipment of wireless communication system, comprised the following steps: receive the initial multistage quadrature amplitude modulation signal sent from the second equipment; Multistage quadrature amplitude modulation signal the rearrangement that the method according to first aspect present invention that reception sends from the first equipment generates; And, according to the described initial multistage quadrature amplitude modulation signal received and the multistage quadrature amplitude modulation signal after described rearrangement, carry out the decode operation of estimating based on merging.

Preferably, described is the decode operation based on the maximum a posteriori method based on merging the decode operation of estimating.

More preferably, the described decode operation based on the maximum a posteriori method is the decode operation based on log-likelihood ratio.

More preferably, the described decode operation based on log-likelihood ratio comprises: the log-likelihood ratio that calculates respectively each bit in described initial multistage quadrature amplitude modulation signal and the multistage quadrature amplitude modulation signal after described rearrangement; According to the corresponding relation of the rearrangement in the rearrangement step of the method according to first aspect present invention operation, the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal is merged and obtains the merging log-likelihood ratio of each bit afterwards with the log-likelihood ratio of each bit in multistage quadrature amplitude modulation signal after the described rearrangement corresponding with it; Log-likelihood ratio based on each bit after described merging carries out decode operation.

According to a third aspect of the invention we, a kind of device of the multistage quadrature amplitude modulation signal sent by the second equipment for the first equipment repeating at wireless communication system has been proposed, comprise: receiving element, for the initial multistage quadrature amplitude modulation signal sent from described the second equipment; Decoding unit, for decoding, described initial multistage quadrature amplitude modulation signal obtains initial symbol sebolic addressing, described symbol sebolic addressing comprises at least one symbol, described symbol comprises a bit sequence, described bit sequence comprises front and rear, and the reliability of the bit of wherein said front portion is different from the reliability of the bit at described rear portion; Reset unit, symbol after the described front portion of described bit sequence and described rear portion are reset, make in position corresponding with described front portion in the bit sequence in the symbol after described rearrangement and comprise the bit at least one described rear portion, and comprise the bit at least one described front portion in position corresponding to described rear portion; Assembled unit, form the symbol sebolic addressing after resetting for the symbol by described rearrangement; The coded excitation unit, the multistage quadrature amplitude modulation signal after being reset for the symbol sebolic addressing after the described rearrangement of encoding and send described rearrangement after multistage quadrature amplitude modulation signal.

Preferably, the described multistage quadrature amplitude modulation signal sent by the second equipment is 16QAM signal or 64QAM signal.

More preferably, when the length at described front portion and described rear portion is identical, described rearrangement unit is for to be exchanged the bit at the bit of described front portion and described rear portion.

Preferably, described the first equipment is trunking or subscriber equipment.

According to a forth aspect of the invention, proposed a kind of for receive the device of multistage quadrature amplitude modulation signal at the 3rd equipment of wireless communication system, comprise: receiving element, the multistage quadrature amplitude modulation signal the rearrangement that the initial multistage quadrature amplitude modulation signal sent from the second equipment for reception and the method according to claim 1 sent from the first equipment generate; Decoding unit, for the described initial multistage quadrature amplitude modulation signal according to receiving and the multistage quadrature amplitude modulation signal after described rearrangement, carry out the decode operation of estimating based on merging.

Preferably, the described decode operation based on merging estimation that described decoding unit carries out is the decode operation based on the maximum a posteriori method.

More preferably, the described decode operation based on the maximum a posteriori method that described decoding unit carries out is the decode operation based on log-likelihood ratio.

More preferably, the described decode operation based on log-likelihood ratio that described decoding unit carries out comprises: the log-likelihood ratio that calculates respectively each bit in described initial multistage quadrature amplitude modulation signal and the multistage quadrature amplitude modulation signal after described rearrangement; According to the corresponding relation of the rearrangement in the rearrangement step of the method according to first aspect present invention operation, the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal is merged and obtains the merging log-likelihood ratio of each bit afterwards with the log-likelihood ratio of each bit in multistage quadrature amplitude modulation signal after the described rearrangement corresponding with it; Log-likelihood ratio based on each bit after described merging carries out decode operation.

In the present invention, by the bit sequence of qam symbol being carried out the rearrangement of position before the RN forward signal, the bit that in fact higher bit and reliability are lower by reliability exchanges.That is to say, avoided the further decline of bit reliability in repeating process that reliability is lower, thus the reliability difference between balanced different bits.The performance of considering forwarding mainly is limited to the bit that reliability is lower, so the present invention has promoted the performance forwarded on the whole.Simultaneously very simple in the operation at RN place, only the bit sequence of decoded symbol need be carried out to the rearrangement of position, without increasing control signal or receiving feedback signals, very little on existing standard impact; And the expense that realizes this operation is also very little, be particularly useful for the situation that UE serves as RN.The method of estimating by merging at receiving terminal in addition can realize decoding by the simple merging of log-likelihood ratio of corresponding bit, and the computing expense of receiving terminal is also very little.Be that the present invention has reached the beneficial effect that promotes the relay cooperative transmission performance with less expense.

The accompanying drawing explanation

Read the following detailed description to non-limiting example by the reference accompanying drawing, further feature of the present invention, purpose and advantage will be more obvious.

Fig. 1 (a) and 1 (b) show the repeating process of DF method;

Fig. 2 shows the 16QAM planisphere of 3GPP regulation and stipulation;

Fig. 3 (a) and 3 (b) show according to relay cooperative transmission procedure of the present invention;

Fig. 4 shows according to signal forwarding process figure of the present invention;

Fig. 5 shows according to signal of the present invention and receives flow chart;

Fig. 6 shows according to signal retransmission unit block diagram of the present invention;

Fig. 7 shows according to signal receiving device block diagram of the present invention;

Fig. 8 shows the Performance Ratio of the present invention and DF method than simulation result.

Wherein, same or analogous Reference numeral means same or analogous steps characteristic or device/module.

Embodiment

In the specific descriptions of following preferred embodiment, with reference to the appended accompanying drawing that forms a part of the present invention.Appended accompanying drawing shows by way of example can realize specific embodiment of the present invention.The embodiment of example is not intended to limit according to all embodiment of the present invention.Be appreciated that and can utilize other embodiment under the prerequisite that does not depart from scope of the present invention, also can carry out the modification of structural or logicality.Therefore, following specific descriptions are also nonrestrictive, and scope of the present invention is limited by appended claim.

Accompanying drawing 3 (a) and 3 (b) show according to relay cooperative transmission procedure of the present invention.Without loss of generality, what use in the present embodiment is the 16QAM modulation, and same the present invention can be applicable to the QAM signal of other exponent numbers easily.For example, in the situation of 64QAM, each symbol comprises 6 bit (b ₁b ₂b ₃b ₄b ₅b ₆), and b ₁, b ₂the bit of position has the reliability higher than the bit of other positions equally, also has the problem of reliability difference between bit, by the method for bit position of the present invention rearrangement, can reach equally the effect of reliability difference between balanced bit.

As shown in accompanying drawing 3 (a), in the first stage of repeating process, (user terminal for example, UE) send to primary signal receiving terminal (base station for example, eNB) He one via node (Relay Node to transmitting terminal simultaneously, be called for short RN, the RN here can be trunking, can be also another UE), without loss of generality, here the primary signal sent comprises a 16QAM symbol sebolic addressing, and this symbol sebolic addressing comprises a 16QAM symbol X ₁(b ₁b ₂b ₃b ₄); As shown in accompanying drawing 3 (b), in the second stage of repeating process, the RN decoded data packets obtains the symbol X of original transmission ₁(b ₁b ₂b ₃b ₄), then by X ₁bit sequence be divided into former and later two parts,

Front portion comprises (b ₁b ₂), rear portion comprises (b ₃b ₄), the reliability difference of this two-part bit, its middle front part (b ₁b ₂) reliability higher.Reset these two parts and generate the symbol after resetting

make in front portion at least contain the bit (b at an original rear portion ₃b ₄), and

in rear portion at least contain an original anterior bit (b ₁b ₂); (b for example ₁b ₃b ₂b ₄), (b ₄b ₂b ₁b ₃) or (b ₄b ₃b ₂b ₁) etc. various forms.Then the symbol after resetting

again modulation, send to receiving terminal.While in the symbol sebolic addressing that primary signal comprises, containing a plurality of symbol, to carry out respectively above-mentioned rearrangement operation to each symbol, then by putting in order of original symbol sequence, the symbols after resetting is synthesized to new symbol sebolic addressing, then new symbol sebolic addressing is modulated and sent.

In the present embodiment, preferred scheme is when resetting operation, and in front and rear situation equal in length, the exchange front and rear, exchange b ₁b ₂and b ₃b ₄position obtain (b ₃b ₄b ₁b ₂), the realization of this preferred version is the simplest, the most pronounced effects of reliability difference between balanced bit.

Accompanying drawing 4 shows according to above-mentioned relay cooperative transmission process, carries out the concrete grammar of data retransmission at the RN place:

S41. receive the initial multistage quadrature amplitude modulation signal sent from described the second equipment;

S42. the described initial multistage quadrature amplitude modulation signal of decoding obtains initial symbol sebolic addressing, described symbol sebolic addressing comprises at least one symbol, described symbol comprises a bit sequence, described bit sequence comprises front and rear, and the reliability of the bit of wherein said front portion is different from the reliability of the bit at described rear portion;

S43. the symbol after the described front portion of described bit sequence and described rear portion being reset, make in position corresponding with described front portion in the bit sequence in the symbol after described rearrangement and comprise the bit at least one described rear portion, and comprise the bit at least one described front portion in position corresponding to described rear portion;

S44. the symbol with described rearrangement forms the symbol sebolic addressing after resetting;

Multistage quadrature amplitude modulation signal after the symbol sebolic addressing of S45. encoding after described rearrangement is reset and send described rearrangement after multistage quadrature amplitude modulation signal.

And, at receiving terminal, receive the primary signal X that transmitting terminal sends ₁(b ₁b ₂b ₃b ₄) and the rearrangement that forwards of RN after signal

(b ₃b ₄b ₁b ₂) after, the present invention proposes, and uses the soft information folding decoding of estimating based on merging at receiving terminal, because receiving terminal has been known X ₁,

between the corresponding relation of bit sequence, adopt to merge the method for estimating and can take full advantage of the information received, obtain better performance.

Concrete, can adopt and multiplely based on merging the mode of estimating, realize decoding, maximal possibility estimation (maximum likelihood is called for short ML) method for example, maximum a posteriori estimation (maximum a posteriori is called for short MAP) method etc.The computing expense of considering the ML method is larger, and preferably the MAP method is decoded in the present embodiment.

Without loss of generality, in the present embodiment, preferred log-likelihood ratio (logarithmic likelihood ratios is called for short LLR) method is decoded, and other coding/decoding methods based on MAP are equally applicable to decoding step of the present invention.

At first, in the first stage of repeating process, the signal that receiving terminal is subject to can be expressed as following formula:

y ₁＝h ₁·x ₁+n ₁

Y wherein ₁for the signal received, h ₁for the channel response of transmitting terminal to receiving terminal, n ₁noise for channel.

Accordingly, the log-likelihood ratio LLR of symbol x1 ₁(X ₁) can be calculated by following formula:

${\mathrm{LLR}}_1\left(x_1\right)=\log P\left(y_1\right|s_i)=-\frac{{(y_1-h_1{s}_i)}^2}{2{\mathrm{\σ}}^2}$

Wherein, logP means conditional probability computing, S _iconventional letter X ₁all possible value, for the situation of 16QAM, i=1～16, σ ²represent noise power.

Then the log-likelihood ratio LLR of each bit in symbol ₁(b _j) can be calculated by following formula:

${\mathrm{LLR}}_1\left(b_j\right)=\log \frac{P\left({\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\right|b_j=1)}{P\left({\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\right|b_j=0)}=\log \frac{\underset{s_i;b_j=1}{\mathrm{\&Sigma;}}P\left({\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\right|s_i)}{\underset{s_k;b_j=0}{\mathrm{\&Sigma;}}P\left({\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_1\right|s_k)}=\log \frac{\underset{s_i;b_j}{\mathrm{\&Sigma;}}\exp \left({\mathrm{LLR}}_1\left(s_i\right)\right)}{\underset{s_k;b_j}{\mathrm{\&Sigma;}}\exp \left({\mathrm{LLR}}_1\left(s_k\right)\right)}$

Wherein, S _i, S _krepresent respectively bit b _j=1 o'clock symbol X ₁all possible value and b _j=0 o'clock symbol X ₁all possible value, for the situation of 16QAM, j=1～4.

So far, we have obtained the log-likelihood ratio of each bit in primary signal that the first stage receives, then according to similarly anti-method, calculate the log-likelihood ratio of each bit in the signal after the rearrangement that second stage receives:

At first be signal model:

${\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_2={\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">h</figure-callout>}}_2\&CenterDot;{\tilde{x}}_1+{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">n</figure-callout>}}_2.$

Y wherein ₂for the signal received, h ₂for the channel response of RN to receiving terminal, n ₂noise for channel.

Then compute sign

log-likelihood ratio:

${\mathrm{LLR}}_2\left({\tilde{x}}_1\right)=\log P\left({\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_2\right|{\tilde{s}}_i)=-\frac{{(y_2-h_2{\tilde{s}}_i)}^2}{2{\mathrm{\&sigma;}}^2}$

Wherein, logP means the conditional probability computing,

conventional letter

all possible value, for the situation of 16QAM, i=1～16, σ ²represent noise power

And then calculate the log-likelihood ratio of each bit:

${\mathrm{LLR}}_2\left({\tilde{b}}_j\right)=\log \frac{P\left({\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_2\right|{\tilde{b}}_j=1)}{p\left({\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_2\right|{\tilde{b}}_j=0)}=\log \frac{\underset{{\tilde{s}}_i;{\tilde{b}}_j=1}{\mathrm{\&Sigma;}}P\left({\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_2\right|{\tilde{s}}_i)}{\underset{{\tilde{s}}_k;{\tilde{b}}_j=0}{\mathrm{\&Sigma;}}P\left({\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HSA00000725230600062.png"\; state="\{\{state\}\}">y</figure-callout>}}_2\right|{\tilde{s}}_k)}=\log \frac{\underset{{\tilde{s}}_i;{\tilde{b}}_j=1}{\mathrm{\&Sigma;}}\exp \left({\mathrm{LLR}}_2\left({\tilde{s}}_i\right)\right)}{\underset{{\tilde{s}}_k;{\tilde{b}}_j=0}{\mathrm{\&Sigma;}}\exp \left({\mathrm{LLR}}_2\left({\tilde{s}}_k\right)\right)}$

Wherein,

represent respectively bit

the time symbol

all possible value and

the time symbol

all possible value, for the situation of 16QAM, j=1～4.

Finally, in the symbol that two stages are received, the log-likelihood ratio of the bit of correspondence position is merged, for symbol X ₁(b ₁b ₂b ₃b ₄) and

(b ₃b ₄b ₁b ₂), the log-likelihood ratio of the bit after merging is:

$\mathrm{LL}\hat{R}\left(b_1\right)={\mathrm{LLR}}_1\left(b_1\right)+{\mathrm{LLR}}_2\left({\tilde{b}}_3\right)$

$\mathrm{LL}\hat{R}\left(b_2\right)={\mathrm{LLR}}_1\left(b_2\right)+{\mathrm{LLR}}_2\left({\tilde{b}}_4\right)$

$\mathrm{LL}\hat{R}\left(b_3\right)={\mathrm{LLR}}_1\left(b_3\right)+{\mathrm{LLR}}_2\left({\tilde{b}}_1\right)$

$\mathrm{LL}\hat{R}\left(b_4\right)={\mathrm{LLR}}_1\left(b_4\right)+{\mathrm{LLR}}_2\left({\tilde{b}}_2\right)$

The log-likelihood ratio of the bit after then being combined

carry out the Turbo decoding.

Accompanying drawing 5 shows according to above-mentioned decoding step, carries out the concrete grammar of decode operation at receiving terminal:

S51. receive the initial multistage quadrature amplitude modulation signal sent from the second equipment;

S52. receive the multistage quadrature amplitude modulation signal the rearrangement that the method according to claim 1 that sends from the first equipment generates;

S53. according to the described initial multistage quadrature amplitude modulation signal received and the multistage quadrature amplitude modulation signal after described rearrangement, carry out the decode operation of estimating based on merging.

Below come again to introduce the device corresponding with said method provided by the present invention in conjunction with block diagram, in view of unit/device characteristic wherein and the steps characteristic in said method have corresponding relation, will conform to the principle of simplicity.

Accompanying drawing 6 shows the block diagram of a kind of device S60 of the multistage quadrature amplitude modulation signal sent by the second equipment for the first equipment repeating at wireless communication system, and emitter S60 comprises:

Receiving element 6001, for the initial multistage quadrature amplitude modulation signal sent from described the second equipment;

Decoding unit 6002, for decoding, described initial multistage quadrature amplitude modulation signal obtains initial symbol sebolic addressing, described symbol sebolic addressing comprises at least one symbol, described symbol comprises a bit sequence, described bit sequence comprises front and rear, and the reliability of the bit of wherein said front portion is different from the reliability of the bit at described rear portion;

Crosspoint 6003, symbol after the described front portion of described bit sequence and described rear portion are reset, make in position corresponding with described front portion in the bit sequence in the symbol after described rearrangement and comprise the bit at least one described rear portion, and comprise the bit at least one described front portion in position corresponding to described rear portion;

Assembled unit 6004, form the symbol sebolic addressing after resetting for the symbol by described rearrangement;

Coded excitation unit 6005, the multistage quadrature amplitude modulation signal after being reset for the symbol sebolic addressing after the described rearrangement of encoding and send described rearrangement after multistage quadrature amplitude modulation signal.

Preferably, the described multistage quadrature amplitude modulation signal sent by the second equipment is 16QAM signal or 64QAM signal

Preferably, when the length at described front portion and described rear portion is identical, described rearrangement unit is for to be exchanged the bit at the bit of described front portion and described rear portion.

Preferably, described the first equipment is trunking or subscriber equipment.

Accompanying drawing 7 shows a kind of for receive the block diagram of the device S70 of multistage quadrature amplitude modulation signal at the 3rd equipment of wireless communication system, and receiving system S70 comprises:

Receiving element 7001, the multistage quadrature amplitude modulation signal the rearrangement that the initial multistage quadrature amplitude modulation signal sent from the second equipment for reception and the method according to this invention sent from the first equipment generate;

Decoding unit 7002, for the described initial multistage quadrature amplitude modulation signal according to receiving and the multistage quadrature amplitude modulation signal after described rearrangement, carry out the decode operation of estimating based on merging.

Preferably, the described decode operation based on merging estimation that described decoding unit carries out is the decode operation based on the maximum a posteriori method.

More preferably, the described decode operation based on the maximum a posteriori method that described decoding unit carries out is the decode operation based on log-likelihood ratio.

More preferably, the described decode operation based on log-likelihood ratio that described decoding unit carries out comprises: the log-likelihood ratio that calculates respectively each bit in described initial multistage quadrature amplitude modulation signal and the multistage quadrature amplitude modulation signal after described rearrangement; According to the corresponding relation of the rearrangement in the rearrangement step of the method according to this invention operation, the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal is merged and obtains the merging log-likelihood ratio of each bit afterwards with the log-likelihood ratio of each bit in multistage quadrature amplitude modulation signal after the described rearrangement corresponding with it; Log-likelihood ratio based on each bit after described merging carries out decode operation.

For proving validity of the present invention, carried out the l-G simulation test of the present invention and the contrast of existing DF method.Use 16QAM and 64QAM modulation in emulation, wherein, for the situation of 64QAM, the bit sequence after rearrangement is (b ₄b ₅b ₆b ₁b ₂b ₃); The 1/3Turbo coding that length is 3460 bits; The channel model supposition UE adopted compares the gain with 5db to the channel of RN with other channels.

Simulation result as shown in Figure 8, can be found out, in the situation that 16QAM and 64QAM, performance performance of the present invention all obviously is better than existing DF method.Simulation result can prove, the retransmission method that the present invention proposes is compared with existing method, reached the purpose of lifting relay cooperative transmission performance, really solved problems of the prior art.

Above embodiments of the invention are described, but the present invention is not limited to specific system, equipment and concrete agreement, those skilled in that art can make various distortion or modification within the scope of the appended claims.

The those skilled in the art of those the art can, by research specification, disclosed content and accompanying drawing and appending claims, understand and implement other changes of the execution mode to disclosing.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In the present invention, " first ", " second " only mean title, do not represent orbution.In the practical application of invention, part may execute claims the function of middle quoted a plurality of technical characterictics.Any Reference numeral in claim should not be construed as the restriction to scope.

Claims (16)

1. the method for the multistage quadrature amplitude modulation signal that the first equipment repeating at wireless communication system is sent by the second equipment comprises the following steps:

A. receive the initial multistage quadrature amplitude modulation signal sent from described the second equipment;

B. the described initial multistage quadrature amplitude modulation signal of decoding obtains initial symbol sebolic addressing, described symbol sebolic addressing comprises at least one symbol, described symbol comprises a bit sequence, described bit sequence comprises front and rear, and the reliability of the bit of wherein said front portion is different from the reliability of the bit at described rear portion;

C. the symbol after the described front portion of described bit sequence and described rear portion being reset, make in position corresponding with described front portion in the bit sequence in the symbol after described rearrangement and comprise the bit at least one described rear portion, and comprise the bit at least one described front portion in position corresponding to described rear portion;

D. form the symbol sebolic addressing after resetting with the symbol after described rearrangement; And

Multistage quadrature amplitude modulation signal after the symbol sebolic addressing of e. encoding after described rearrangement is reset and send described rearrangement after multistage quadrature amplitude modulation signal.

2. method according to claim 1, wherein, the described multistage quadrature amplitude modulation signal sent by the second equipment is 16QAM signal or 64QAM signal.

3. method according to claim 2, wherein, when the length at described front portion and described rear portion is identical, described being rearranged to exchanged the bit at the bit of described front portion and described rear portion.

4. according to the method in any one of claims 1 to 3, it is characterized in that, described the first equipment is trunking or subscriber equipment.

5. a method that receives multistage quadrature amplitude modulation signal in the 3rd equipment of wireless communication system comprises the following steps:

-receive from the initial multistage quadrature amplitude modulation signal of the second equipment transmission;

Multistage quadrature amplitude modulation signal the rearrangement that the method according to claim 1 that-reception sends from the first equipment generates; And

-according to the described initial multistage quadrature amplitude modulation signal received and the multistage quadrature amplitude modulation signal after described rearrangement, carry out the decode operation of estimating based on merging.

6. method according to claim 5, is characterized in that, described is the decode operation based on the maximum a posteriori method based on merging the decode operation of estimating.

7. method according to claim 6, is characterized in that, the described decode operation based on the maximum a posteriori method is the decode operation based on log-likelihood ratio.

8. method according to claim 7, is characterized in that, the described decode operation based on log-likelihood ratio comprises:

-calculate respectively the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal and the multistage quadrature amplitude modulation signal after described rearrangement;

-according to the corresponding relation of the rearrangement in the described step c of method according to claim 1 operation, the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal is merged and obtains the merging log-likelihood ratio of each bit afterwards with the log-likelihood ratio of each bit in multistage quadrature amplitude modulation signal after the described rearrangement corresponding with it;

-log-likelihood ratio based on each bit after described merging carries out decode operation.

9. the device of the multistage quadrature amplitude modulation signal sent by the second equipment for the first equipment repeating at wireless communication system comprises:

Receiving element, for the initial multistage quadrature amplitude modulation signal sent from described the second equipment;

Decoding unit, for decoding, described initial multistage quadrature amplitude modulation signal obtains initial symbol sebolic addressing, described symbol sebolic addressing comprises at least one symbol, described symbol comprises a bit sequence, described bit sequence comprises front and rear, and the reliability of the bit of wherein said front portion is different from the reliability of the bit at described rear portion;

Reset unit, symbol after the described front portion of described bit sequence and described rear portion are reset, make in position corresponding with described front portion in the bit sequence in the symbol after described rearrangement and comprise the bit at least one described rear portion, and comprise the bit at least one described front portion in position corresponding to described rear portion;

Assembled unit, form the symbol sebolic addressing after resetting for the symbol by described rearrangement;

The coded excitation unit, the multistage quadrature amplitude modulation signal after being reset for the symbol sebolic addressing after the described rearrangement of encoding and send described rearrangement after multistage quadrature amplitude modulation signal.

10. device according to claim 9, wherein, the described multistage quadrature amplitude modulation signal sent by the second equipment is 16QAM signal or 64QAM signal.

11. device according to claim 10, wherein, when the length at described front portion and described rear portion is identical, described rearrangement unit is for to be exchanged the bit at the bit of described front portion and described rear portion.

12. according to the described device of any one in claim 9 to 11, it is characterized in that, described the first equipment is trunking or subscriber equipment.

13. the device for the multistage quadrature amplitude modulation signal of the 3rd equipment reception at wireless communication system comprises:

Receiving element, the multistage quadrature amplitude modulation signal the rearrangement that the initial multistage quadrature amplitude modulation signal sent from the second equipment for reception and the method according to claim 1 sent from the first equipment generate;

Decoding unit, for the described initial multistage quadrature amplitude modulation signal according to receiving and the multistage quadrature amplitude modulation signal after described rearrangement, carry out the decode operation of estimating based on merging.

14. device according to claim 13, is characterized in that, the described decode operation based on merging estimation that described decoding unit carries out is the decode operation based on the maximum a posteriori method.

15. device according to claim 14, is characterized in that, the described decode operation based on the maximum a posteriori method that described decoding unit carries out is the decode operation based on log-likelihood ratio.

16. device according to claim 15, is characterized in that, the described decode operation based on log-likelihood ratio that described decoding unit carries out comprises:

-calculate respectively the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal and the multistage quadrature amplitude modulation signal after described rearrangement;

-according to the corresponding relation of the rearrangement in the described step c of method according to claim 1 operation, the log-likelihood ratio of each bit in described initial multistage quadrature amplitude modulation signal is merged and obtains the merging log-likelihood ratio of each bit afterwards with the log-likelihood ratio of each bit in multistage quadrature amplitude modulation signal after the described rearrangement corresponding with it;

-log-likelihood ratio based on each bit after described merging carries out decode operation.

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