CN102487315A - Multi-source multi-relay cooperation communication method, communication equipment and cooperation communication system - Google Patents

Abstract

An embodiment of the invention provides a multi-source multi-relay cooperation communication method, communication equipment and a cooperation communication system. The multi-source multi-relay cooperation communication method comprises the following steps: the communication equipment receives a modulation signal sent by source user equipment at a first time slot; the communication equipment receives a modulation signal sent by the source user equipment at a second time slot and a modulation signal sent by relay user equipment; the modulation signal sent by the relay user equipment is an information bit sequence of the source user equipment recovered from the modulation signal sent by the source user equipment at the first time slot by the relay user equipment, according to the recovered information bit sequence, network coding is carried out, and data after the network coding is modulated to obtain a modulation signal; the communication equipment utilizes the modulation signal received at the first time slot and the modulation signal received at the second time slot and acquires an information bit sequence before modulation of the modulation signal sent by the source user equipment. According to a technical scheme provided by the invention, data transmission time can be saved.

Description

Many relayings of multi-source collaboration communication method, communication equipment and cooperation communication system

Technical field

The present invention relates to communication technical field, particularly a kind of many relayings of multi-source collaboration communication method, communication equipment and cooperation communication system.

Background technology

In wireless network, the user collaboration relay transmission provides the effective technology of space diversity gain, and it can improve throughput of system, strengthens transmission performance and enlarges network coverage.

Traditional relaying collaboration communication technology needs 4 time slots altogether.At first time slot, source user A sends data to trunk subscriber and base station.At second time slot, trunk subscriber is transmitted to the base station with the packet of the source user A that receives.Adopt similar method, at the 3rd time slot, source user B sends data to trunk subscriber and base station.At the 4th time slot, trunk subscriber is given the base station with the data forwarding of the source user B that receives.

Network code has changed the information processing manner in traditional relaying collaboration communication, and the original intention that network code proposes is in order to make multicast transmission reach theoretic maximum transfer capacity, thereby can obtain than the better network throughput of traditional routing mode.Along with going deep into of research, network code promotes bandwidth availability ratio in balance network load; Improve the robustness of network linking, reduce the expense of network management, save the transmission energy consumption; Also there is very big advantage aspects such as increase safety of transmission; And network code can solve the insurmountable problem of conventional wireless techniques, improves the wireless network transmissions performance to a great extent, as improves wireless transmission throughput and energy utilization efficiency, the reliable transmission that guarantees Radio Link and fail safe etc.

But wireless cooperation communication is the application network coding techniques also, to obtain the further improvement of network performance.Fig. 1 shows the quadrature collaboration communication model of a coding Network Based.As shown in Figure 1, in first time slot (shown in fine line among Fig. 1), source user A is with the packet b of oneself ₁Send.Second time slot (shown in dotted line among Fig. 1), source user B is with the packet b of oneself ₂Send.At the 3rd time slot (shown in heavy line among Fig. 1), trunk subscriber C carries out network code to the data that preceding two time slots receive.For example: XOR is handled after this; Trunk subscriber is handled the packet that obtains with XOR and is sent to base station D; Suitably handle the signal that these 3 time slots receive the base station; Can obtain the user collaboration space diversity gain; And recovering the data that source user A and source user B send, the quadrature collaboration communication of coding Network Based can be saved a time slot.

But, for the many relay systems of multi-source, adopt the quadrature collaboration communication mode of above-mentioned coding Network Based, still need in three time slots, accomplish the collaboration communication flow process.

Summary of the invention

The embodiment of the invention provides a kind of many relayings of multi-source collaboration communication method, communication equipment and network system, can save data transmission period.

In view of this, the embodiment of the invention provides:

The collaboration communication method of the many relayings of a kind of multi-source comprises:

The modulation signal that communication equipment sends at the first time slot reception sources subscriber equipment;

Communication equipment receives the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; To be said trunk subscriber equipment recover the signal bit sequence of source user equipment from said source user equipment to the modulation signal that said trunk subscriber equipment sends the modulation signal that first time slot sends; Carry out network code according to the signal bit sequence that recovers, and the data that obtain behind the network code are modulated the modulation signal that obtains;

Communication equipment is utilized in the modulation signal of first time slot reception and the modulation signal that receives at second time slot, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

A kind of communication equipment comprises:

The Data Receiving unit is used for the modulation signal in the transmission of the first time slot reception sources subscriber equipment, receives the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; To be said trunk subscriber equipment recover the signal bit sequence of source user equipment from said source user equipment to the modulation signal that said trunk subscriber equipment sends the modulation signal that first time slot sends; Carry out network code according to the signal bit sequence that recovers, and the data that obtain behind the network code are modulated the modulation signal that obtains;

Decoding unit is used to utilize receiving element at the modulation signal of first time slot reception and the modulation signal that receives at second time slot, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

A kind of cooperation communication system comprises: above-mentioned communication equipment, source user equipment and a plurality of trunk subscriber equipment, wherein,

Said source user equipment is used for sending modulation signal at first time slot, sends said modulation signal at second time slot;

Said trunk subscriber equipment; Be used for recovering the signal bit sequence of source user equipment from the modulation signal that source user equipment is sent at first time slot; The signal bit sequence that utilization recovers carries out network code; And the data that obtain behind the network code are modulated, send the modulation signal that modulation obtains at second time slot.

The modulation signal that embodiment of the invention communication equipment sends at the first time slot reception sources subscriber equipment; Receive the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; The modulation signal that utilizes two time slots to receive just can obtain the signal bit sequence before the source user equipment modulation, has saved data transmission period.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is many relayings of multi-source collaboration communication method flow chart that prior art provides;

Fig. 2 is a kind of many relayings of multi-source collaboration communication method flow chart that the embodiment of the invention provides;

Fig. 3 is another kind of many relayings of multi-source collaboration communication method flow chart that the embodiment of the invention provides;

Fig. 4 be the embodiment of the invention provide many relayings of multi-source collaboration communication the time coding/decoding method flow chart;

Fig. 5 be the embodiment of the invention provide many relayings of multi-source collaboration communication the time base station decodes sketch map;

Fig. 6 is a kind of many relayings of self adaptation multi-source collaboration communication method flow chart that the embodiment of the invention provides;

Fig. 7 is the BER performance sketch map relatively of the network coding cooperation communication mechanism that provides of the embodiment of the invention and non-coordination mechanism;

Fig. 8 is the performance sketch map based on the network coding cooperation communication mechanism of different source user equipment numbers that the embodiment of the invention provides;

Fig. 9 is the performance impact sketch map of the self adaptation multi-source multiuser transmission method that provides of the embodiment of the invention to the network coding cooperation communication mechanism;

Figure 10 is the communication equipment structural representation that the embodiment of the invention provides;

Figure 11 is the decoding unit structural representation that the embodiment of the invention provides.

Embodiment

Consult Fig. 2, the embodiment of the invention provides the collaboration communication method of the many relayings of a kind of multi-source, and it comprises:

201, communication equipment is at the modulation signal of first time slot reception sources subscriber equipment transmission.

202, communication equipment receives the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; To be trunk subscriber equipment recover the signal bit sequence of source user equipment from source user equipment to the modulation signal that said trunk subscriber equipment sends the modulation signal that first time slot sends; The signal bit sequence that utilization recovers carries out network code, and the data that obtain behind the network code are modulated the modulation signal that obtains.

203, communication equipment is utilized in the modulation signal of first time slot reception and the modulation signal that receives at second time slot, obtains the preceding signal bit sequence of modulation signal modulation that said source user equipment is sent.Wherein, the signal bit sequence before the modulation signal modulation that the source user equipment of being obtained is sent is that source user needs outside initial data of sending.

Wherein, the communication equipment in the present embodiment can be the base station.

If consider the influence of wireless channel to the modulation signal of source user equipment, the transmission of trunk subscriber equipment, then communication equipment receives first distorted signal from source user equipment at first time slot in step 201; Receive from second distorted signal of said source user equipment with from the distorted signal of said trunk subscriber equipment at second time slot; Wherein, first distorted signal, second distorted signal are the said source user equipment signals after the same modulation signal that first time slot, second time slot send distorts in transmission course respectively; Distorted signal from said trunk subscriber equipment is the signal of said trunk subscriber equipment after the modulation signal that second time slot sends distorts in transmission course; Communication equipment is utilized in the distorted signal of first time slot reception and the distorted signal that receives at second time slot in the step 203, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

Wherein, step 203 specifically comprises the steps:

A, communication equipment utilize outside log-likelihood ratio computing formula, are utilized in the modulation signal that first time slot receives, and obtain the signal after the outside log-likelihood ratio deinterleaving of the modulation signal correspondence that i source user equipment of first time slot send; Be utilized in the modulation signal that second time slot receives, obtain signal and second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i source user equipment of second time slot send signal after the outside log-likelihood ratio deinterleaving of modulation signal correspondence of a plurality of trunk subscriber equipment transmissions that said i source user equipment communicate by letter of cooperating;

Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that B, communication equipment utilize i source user equipment of first time slot to send and second time slot carries out network and deciphers, and obtains the first network decode results; Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that utilizes i source user equipment of second time slot to send and second time slot carries out network and deciphers, and obtains the second network decode results.

The mode that obtains the first network decode results is following:

Obtain that each trunk subscriber equipment of said i source user equipment communication of cooperation is contributed the first kind of i source user equipment and; Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula to obtain to the first kind contribution of i source user equipment in first time slot:

$\log \frac{P(c_i^j=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering; is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and

equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and

equals 0 probability.

If we consider the source user equipment to the wireless channel, the relay device sends the user of the modulated signal, the base station receives from the source user equipment, the user equipment, the relay signal is distorted, the first time slot of the i Sites a source user a user equipment device communication relay the i th source contribution of the first type of user devices can be expressed as:

where,

represents the first slot communication device receives from the source user equipment distortion signal

second slot communication equipment received from the relay user equipment distortion signal

conditions,

is equal to a probability;

represents the first slot communication device receives from the source user equipment distortion signal

communication device receives the second slot from the relay user equipment distortion signal

conditions,

is equal to zero probability; should be noted that: is equal to

is equal to

The mode that obtains the second network decode results is following:

Each the trunk subscriber equipment that obtains said i source user equipment communication of cooperation to second type of contribution of i source user equipment and; Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula acquisition to second type of contribution of i source user equipment in second time slot:

$\log \frac{P(c_i^j=1/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 0 probability.

If consider the influence of wireless channel to the modulation signal of source user equipment, the transmission of trunk subscriber equipment; The base station receives is under the situation from the distorted signal of source user equipment, trunk subscriber equipment; Then the trunk subscriber equipment of i source user equipment communication of cooperation can be expressed as second type of contribution of i source user equipment in second time slot: wherein;

is illustrated under the condition of the distorted signal from trunk subscriber equipment

that the distorted signal from source user equipment the second time slot communication equipment that the second time slot communication equipment receives receives, and

equals 1 probability;

is illustrated under the condition of the distorted signal from trunk subscriber equipment

that the distorted signal from source user equipment

the second time slot communication equipment that the second time slot communication equipment receives receives, and

equals 0 probability.Wherein,

equals

and equals

C, communication equipment calculate signal after the outside log-likelihood ratio deinterleaving of the modulation signal correspondence that i the source user equipment of signal, second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i source user equipment of first time slot send send, the first network decode results, the second network decode results and; To said with carry out channel decoding, obtain the first channel decoding result.

The difference of signal interweaves after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that D, communication equipment send the first channel decoding result and i source user equipment of first time slot; Obtain first result that interweaves, interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of first time slot of substitution as a result send first; Signal after the outside log-likelihood ratio deinterleaving that the modulation signal of i source user equipment transmission of second time slot is corresponding is deciphered, and obtains the second channel decode results; The difference of the signal after the outside log-likelihood ratio deinterleaving that the modulation signal of i source user equipment transmission of the second channel decode results and second time slot is corresponding interweaves; Obtain second result that interweaves, and interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of second time slot of substitution as a result send second; The signal that second time slot is cooperated after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that the trunk subscriber equipment of said i source user equipment communication sends carries out channel decoding; Obtain the 3rd channel decoding result; The difference of the signal after the outside log-likelihood ratio deinterleaving that the 3rd channel decoding result is corresponding with the modulation signal of the said trunk subscriber equipment transmission of second time slot interweaves; Obtain the 3rd result that interweaves; Interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that the second time slot trunk subscriber equipment of substitution as a result sends the 3rd, return order execution in step A, B, C, till satisfying stopping criterion for iteration.Wherein, satisfying stopping criterion for iteration can be the iterations that reaches predetermined, also can be the value trend convergence that the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment sent is calculated.

The modulation signal that embodiment of the invention communication equipment sends at the first time slot reception sources subscriber equipment; Receive the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; The signal that utilizes two time slots to receive just can obtain the signal bit sequence before the source user equipment modulation, has saved data transmission period.

In order to make technical scheme provided by the invention clearer, following embodiment is described in detail technical scheme provided by the invention:

Fig. 3 shows the embodiment of the invention a kind of many relayings of multi-source collaboration communication method is provided; This method supposition cooperation communication system includes N subscriber equipment, and wherein: the source user equipment set is labeled as

1≤i≤K.In addition; The trunk subscriber cluster tool is labeled as

1≤j≤(N-K); Each subscriber equipment uses single antenna, and this method specifically comprises:

301, at first time slot, K source user equipment broadcasting modulation signal, trunk subscriber equipment recover the preceding signal bit sequence of modulation signal modulation of source user equipment broadcasting.

Concrete, K source user equipment is to signal bit sequence

Encode, obtain sequence

Wherein, L _dBe the frame length of signal bit sequence, L _cThe frame length of the sequence that obtains for coding, concrete, (Forward Error Correction, FEC) coding techniques is encoded, and also can utilize Turbo code to encode can to utilize forward error correction.Utilize then interleaver, modulator to the sequence that coding obtains interweave, modulation treatment, obtain modulation signal, the broadcasting modulation signal.

Trunk subscriber equipment receives the modulation signal of K source user equipment broadcasting; Use interlacing multi-address to insert (interleave-division multiple-access; IDMA) iteration multi-subscriber test method; Recover the modulation signal modulation signal bit sequence before that source user equipment is sent; Be designated as

wherein, 1≤j≤(N-K), 1≤i≤K.

Because modulation signal is that K source user equipment sent with broadcast mode; So the base station can receive the first corresponding distorted signal of this modulation signal, first distorted signal that the base station receives in this step is the signal of source user equipment after the modulation signal of first time slot broadcasting distorts in transmission course.Concrete, the signal that the base station receives does

1≤l≤L _s, L _SBe the symbol lengths of a frame,

Be the additive white Gaussian noise (AWGN) that the place, base station produces, its average is 0, and variance does

Represent the piece fading channel between i source user equipment and the base station,

Be the modulation signal of i source user equipment broadcasting of first time slot,

It is first distorted signal.

302, at second time slot, source user equipment is broadcasted modulation signal once more, trunk subscriber equipment use linear network encoding to the signal bit sequence of the source user equipment that recovers encode, interweave, modulation treatment, the modulation signal after the broadcasting modulation treatment.

In this time slot, trunk subscriber equipment is encoded the signal bit sequence of the source user equipment that recovers, and obtains sequence

Use linear network encoding then, bits of coded carried out xor operation,

Wherein, 1≤j≤(N-K), if

Order

Wherein, A _jBe the selected set of carrying out the source user equipment of network code of j trunk subscriber equipment, wherein, trunk subscriber equipment can select specific source user equipment to carry out network code, specifically can select whole source user equipment, also can be the part source user equipment.N-K trunk subscriber equipment to the xor operation result interweave, modulation treatment, broadcast modulation signal then.

In second time slot; Source user equipment is broadcasted the modulation signal of oneself once more; In this time slot; The base station receives from second distorted signal of source user equipment with from the distorted signal of relaying with equipment; Wherein, Second distorted signal from source user equipment is the signal of source user equipment after the modulation signal that second time slot sends distorts in transmission course; Is the signal of trunk subscriber equipment after the modulation signal that second time slot sends distorts in transmission course from relaying with the distorted signal of equipment; Concrete; The signal that the base station receives in this time slot; It is expressed as:

wherein;

is the modulation signal of i source user equipment in the broadcasting of second time slot;

is the piece fading channel between i source user equipment and the base station, and

is second distorted signal;

is the modulation signal of j trunk subscriber equipment in the broadcasting of second time slot;

is the flat block fading channel between j trunk subscriber equipment and base station, and is the distorted signal from trunk subscriber equipment;

is the additive white Gaussian noise that the base station produced; Its mean value is 0, and variance is

303, the base station obtains the preceding signal bit sequence of source user equipment modulation according to the signal of first time slot reception and the signal of second time slot reception.

As shown in Figure 4, this step 303 specifically comprises:

401, utilize the approximate soft multiuser detection algorithm of chip-level Gaussian distribution in the base station; The signal that utilizes first time slot to receive; The outside log-likelihood ratio that obtains the modulation signal correspondence that the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of first time slot send sends i source user equipment of first time slot carries out deinterleaving, obtains the signal

after the deinterleaving

Concrete; According to following formula (1); Through using the approximate soft multiuser detection algorithm of chip-level Gaussian distribution; Utilize following outside log-likelihood ratio computing formula, obtain the corresponding outside log-likelihood ratio of modulation signal

that i source user equipment of first time slot sent.

$e_{\mathrm{MUD}}\left(x_i^S\right)=\frac{{2h}_i^{\mathrm{SD}}}{\underset{i^{\&prime;}\&NotEqual;i}{\mathrm{\&Sigma;}}{\left|h_{i^{\&prime;}}^{\mathrm{SD}}\right|}^2\mathrm{Var}\left(x_{i^{\&prime;}}^S\right)+{\mathrm{\&sigma;}}_1^2}({\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{SD}}-\underset{i^{\&prime;}\&NotEqual;i}{\mathrm{\&Sigma;}}E\left(x_{i^{\&prime;}}^S\right)),$ $\&ForAll;i,---\left(1\right)$

Wherein,

is a posterior information of

of first channel decoding unit feedback, and Var () and E () represent to ask variance and average respectively.Wherein,

wherein, representes any one

Wherein, Utilize the approximate soft multiuser detection algorithm of chip-level Gaussian distribution; Obtaining the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of first time slot send is to be obtained by the first Multiuser Detection MUD unit in the base station, and it is by the execution of the first deinterleaving unit in the base station that the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of first time slot sent carries out the deinterleaving operation.

402, utilize the approximate soft multiuser detection algorithm of chip-level Gaussian distribution in the base station; The signal that utilizes second time slot to receive; The outside log-likelihood ratio that obtains the modulation signal correspondence that the corresponding outside log-likelihood ratio

of modulation signal that i source user equipment of second time slot send sends i source user equipment of second time slot carries out deinterleaving, obtains the signal

after the deinterleaving

Adopt the mode similar, obtain the corresponding outside log-likelihood ratio of modulation signal

that i source user equipment of second time slot sent with step 401.

Utilize the approximate soft multiuser detection algorithm of chip-level Gaussian distribution in the base station; Obtaining the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of second time slot send is to be carried out by the second Multiuser Detection MUD unit in the base station, and the operation that the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of second time slot sent carries out deinterleaving is by the execution of the second deinterleaving unit in the base station.

403, utilize the approximate soft multiuser detection algorithm of chip-level Gaussian distribution in the base station; The signal that utilizes second time slot to receive; Obtain the second time slot corresponding outside log-likelihood ratio

of modulation signal that the trunk subscriber equipment of i source user equipment communication sends of cooperating the corresponding outside log-likelihood ratio of modulation signal that the relaying subscriber equipment sends is carried out deinterleaving, obtain the signal after the deinterleaving respectively

Adopt the mode similar, the signal after the outside log-likelihood ratio deinterleaving of

that obtains to receive in second time slot with step 401.

Utilize the approximate soft multiuser detection algorithm of chip-level Gaussian distribution in the base station; Obtaining the second time slot corresponding outside log-likelihood ratio of modulation signal that the trunk subscriber equipment of i source user equipment communication sends of cooperating is to be carried out by the 3rd Multiuser Detection MUD unit in the base station, and the corresponding outside log-likelihood ratio of modulation signal that the relaying subscriber equipment is sent carries out the deinterleaving operation has the 3rd deinterleaving unit to carry out.

Need to prove that step 401-403 does not have the sequencing on the sequential, can carry out simultaneously.

404, cooperate signal

after the outside log-likelihood ratio deinterleaving of modulation signal correspondence of the trunk subscriber equipment transmission that said i source user equipment communicate by letter of the signal

after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that utilizes i source user equipment of first time slot to send and second time slot carries out network and deciphers, and obtains the first network decode results

The network decoded operation of this step specifically can be carried out by the first network code decoding unit.

Concrete; According to following formula (2), obtain the value of j trunk subscriber equipment to first contribution

of i source user equipment;

$L_{\mathrm{MUD}}^S\left(c_i^j\right)=\log \frac{P(c_i^j=1/R)}{P(c_i^j=0/R)}=\log \frac{\mathrm{\&alpha;}+\exp \left(L_{\mathrm{MUD}}\left(c_j^R\right)\right)}{1+\mathrm{\&alpha;}*\exp \left(L_{\mathrm{MUD}}\left(c_j^R\right)\right)},$ $\&ForAll;i,j,---\left(2\right)$

Wherein,

is j trunk subscriber equipment to the signal bit sequence of i source user equipment the recovering resultant signal of encoding;

is illustrated under the condition of the distorted signal from trunk subscriber equipment

that first distorted signal from source user equipment

, second time slot base station that first time slot base station receives receives, and

equals 1 probability;

is illustrated under the condition of the distorted signal from trunk subscriber equipment

that first distorted signal from source user equipment

, second time slot base station that first time slot base station receives receives, and equals 0 probability;

Wherein,

$\mathrm{\&alpha;}=\frac{\underset{l\&NotEqual;i}{\underset{1\&le;l\&le;K}{\mathrm{\&Sigma;}}}\exp \left(L_{\mathrm{MUD}}\left(c_l^S\right)\right)+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-1}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{K-1}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}\left(c_{l_m}^S\right)\right)}{1+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;l_2\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{2}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MID}}\left(c_{l_m}^S\right)\right)+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-2}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{K-2}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}\left(c_{l_m}^S\right)\right)},$

Be derivation as follows to formula (2):

$L_{\mathrm{MUD}}^S\left(c_i^j\right)=\log \frac{P(c_i^j=1/R)}{P(c_i^j=0/R)}$

$=\log \frac{P(c_j^R\&CirclePlus;(c_1^S\&CirclePlus;c_2^S\&CirclePlus;...\&CirclePlus;c_{i-1}^S\&CirclePlus;c_{i+1}^S\&CirclePlus;...\&CirclePlus;c_K^S)=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{SD}},r_2^{\mathrm{RD}})}{P(c_j^R\&CirclePlus;(c_1^S\&CirclePlus;c_2^S\&CirclePlus;...\&CirclePlus;c_{i-1}^S\&CirclePlus;c_{i+1}^S\&CirclePlus;...\&CirclePlus;c_K^S)=0/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{SD}},r_2^{\mathrm{RD}})}$

$=\log \frac{P(c_j^R=0/r_2^{\mathrm{RD}})\mathrm{\&zeta;}+P(c_j^R=1/r_2^{\mathrm{RD}})(1-\mathrm{\&zeta;})}{P(c_j^R=0/r_2^{\mathrm{RD}})(1-\mathrm{\&zeta;})+P(c_j^R=1/r_2^{\mathrm{RD}})\mathrm{\&zeta;}}$

$=\log \frac{\mathrm{\&alpha;}+\exp \left(L_{\mathrm{MUD}}\left(c_j^R\right)\right)}{1+\mathrm{\&alpha;}*\exp \left(L_{\mathrm{MUD}}\left(c_j^R\right)\right)},$

Wherein, $\mathrm{\&zeta;}=P(\frac{1-{(-1)}^{c_1^S+c_2^S+...+c_{i-1}^S+c_{i+1}^S+...+c_K^S}}{2}=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{SD}})$

$\mathrm{\&alpha;}=\frac{\mathrm{\&zeta;}}{1-\mathrm{\&zeta;}}$

$=\frac{P(\frac{1-{(-1)}^{c_1^S+c_2^S+...+c_{i-1}^S+c_{i+1}^S+...+c_K^S}}{2}=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{SD}})}{P(\frac{1-{(-1)}^{c_1^S+c_2^S+...+c_{i-1}^S+c_{i+1}^S+...+c_K^S}}{2}=0/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{SD}})}$

$\text{=}\frac{\underset{l\&NotEqual;i}{\underset{1\&le;l\&le;K}{\mathrm{\&Sigma;}}}{A}_l+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;l_2\&le;l_3\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}{A}_{l_3}+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-1}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}...A_{l_{K-1}}}{1+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;l_2\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-2}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}...A_{l_{K-2}}}$

$=\frac{\underset{l\&NotEqual;i}{\underset{1\&le;l\&le;K}{\mathrm{\&Sigma;}}}\exp \left(L_{\mathrm{MUD}}\left(c_l^S\right)\right)+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-1}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{K-1}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}\left(c_{l_m}^S\right)\right)}{1+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-2}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{K-2}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}\left(c_{l_m}^S\right)\right)},$

Wherein,

1≤l≤K; L ≠ i is if 1≤l≤K.

405, cooperate signal

after the outside log-likelihood ratio deinterleaving of modulation signal correspondence of a plurality of trunk subscriber equipment transmissions that said i source user equipment communicate by letter of the signal

after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that utilizes i source user equipment of second time slot to send and second time slot carries out network and deciphers, and obtains the second network decode results

The network decoded operation of this step specifically can be carried out by the second network code decoding unit.

Concrete; According to following formula, obtain the value of j trunk subscriber equipment to second contribution

of i source user equipment;

$L_{\mathrm{MUD}}^{\&prime;S}\left(c_i^j\right)=\log \frac{P(c_i^j=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{RD}},r_2^{\mathrm{RD}})}{P(c_i^j=0/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{RD}},r_2^{\mathrm{RD}})}$

$=\log \frac{P(c_j^R\&CirclePlus;(c_1^S\&CirclePlus;c_2^S\&CirclePlus;...\&CirclePlus;c_{i-1}^S\&CirclePlus;c_{i+1}^S\&CirclePlus;...\&CirclePlus;c_K^S)=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{RD}},r_2^{\mathrm{RD}})}{P(c_j^R\&CirclePlus;(c_1^S\&CirclePlus;c_2^S\&CirclePlus;...\&CirclePlus;c_{i-1}^S\&CirclePlus;c_{i+1}^S\&CirclePlus;...\&CirclePlus;c_K^S)=0/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\mathrm{RD}},r_2^{\mathrm{RD}})}$

$=\log \frac{P(c_j^R=0/r_2^{\mathrm{RD}})\mathrm{\&zeta;}+P(c_j^R=1/r_2^{\mathrm{RD}})(1-\mathrm{\&zeta;})}{P(c_j^R=0/r_2^{\mathrm{RD}})(1-\mathrm{\&zeta;})+P(c_j^R=1/r_2^{\mathrm{RD}})\mathrm{\&zeta;}}$

$=\log \frac{\mathrm{\&alpha;}+\exp \left(L_{\mathrm{MUD}}\left(c_j^R\right)\right)}{1+\mathrm{\&alpha;}*\exp \left(L_{\mathrm{MUD}}\left(c_j^R\right)\right)}$

Wherein, is illustrated under the condition of the distorted signal from trunk subscriber equipment that second distorted signal from source user equipment

, second time slot base station that second time slot base station receives receives, and

equals 1 probability; is illustrated under the condition of the distorted signal from trunk subscriber equipment

that second distorted signal from source user equipment

, second time slot base station that second time slot base station receives receives, and

equals 0 probability.

$\mathrm{\&alpha;}=\frac{\mathrm{\&zeta;}}{1-\mathrm{\&zeta;}}$

$=\frac{P(\frac{1-{(-1)}^{c_1^S+c_2^S+...+c_{i-1}^S+c_{i+1}^S+...+c_K^S}}{2}=1/r_2^{\mathrm{SD}})}{P(\frac{1-{(-1)}^{c_1^S+c_2^S+...+c_{i-1}^S+c_{i+1}^S+...+c_K^S}}{2}=0/r_2^{\mathrm{SD}})}$

$\text{=}\frac{\underset{l\&NotEqual;i}{\underset{1\&le;l\&le;K}{\mathrm{\&Sigma;}}}{A}_l+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;l_2\&le;l_3\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}{A}_{l_3}+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-1}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}...A_{l_{K-1}}}{1+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;l_2\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-2}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}{A}_{l_1}{A}_{l_2}...A_{l_{K-2}}}$

$=\frac{\underset{l\&NotEqual;i}{\underset{1\&le;l\&le;K}{\mathrm{\&Sigma;}}}\exp \left(L_{\mathrm{MUD}}^{\&prime;}\left(c_l^S\right)\right)+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-1}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{K-1}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}^{\&prime;}\left(c_{l_m}^S\right)\right)}{1+...+\underset{l_{}}{\underset{1\&le;{\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">l</figure-callout>}}_1\&le;...\&le;l_{K-2}\&le;\mathrm{<figure-callout\; id="1"\; label="K\; l"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">K</figure-callout>}}{\mathrm{\&Sigma;}}}\exp \left(\underset{m=1}{\overset{K-2}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}^{\&prime;}\left(c_{l_m}^S\right)\right)},$

Need to prove that step 404,405 does not have the sequencing on the sequential, can carry out simultaneously.

406, signal, the first network decode results and the second network decode results after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that i the source user equipment of signal, second time slot after the outside log-likelihood ratio deinterleaving that base station modulation signal that i source user equipment of first time slot sent is corresponding sent are sued for peace, and obtain the outside log-likelihood ratio

of i source user equipment

Concrete, utilize following formula (3), obtain the outside log-likelihood ratio of i source user equipment:

$L_{\mathrm{MUD}}^{\mathrm{NC}}\left(c_i^S\right)=L_{\mathrm{MUD}}\left(c_i^S\right)+\underset{j=1}{\overset{N-K}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}^S\left(c_i^j\right)+{L^{\&prime;}}_{\mathrm{MUD}}\left(c_i^S\right)+\underset{j=1}{\overset{N-K}{\mathrm{\&Sigma;}}}{L}_{\mathrm{MUD}}^{\&prime;S}\left(c_i^j\right),$ $\&ForAll;i.---\left(3\right)$

407, channel decoding is carried out to the outside log-likelihood ratio

of i source user equipment in the base station; Obtain the first channel decoding result; The difference

of signal interweaves after the outside log-likelihood ratio deinterleaving that the modulation signal of the first channel decoding result and i source user equipment transmission of first time slot is corresponding; Obtain first result

that interweaves and interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of result

substitution first time slot send, till reaching stopping criterion for iteration first.

Carrying out the operation of channel decoding in this step can be carried out by the first channel decoding unit in the base station.

408, the signal

after the outside log-likelihood ratio deinterleaving that base station modulation signal that i source user equipment of second time slot sent is corresponding carries out channel decoding, obtains the second channel decode results; The difference

of the signal

after the outside log-likelihood ratio deinterleaving that the modulation signal of i source user equipment transmission of the second channel decode results and second time slot is corresponding interweaves; Obtain second the interweave result

and interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of second time slot of substitution as a result send second, till reaching stopping criterion for iteration.

Carrying out the operation of channel decoding in this step can be carried out by the second channel decoding unit in the base station.

409, base station signal

that second time slot is cooperated after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that the trunk subscriber equipment of said i source user equipment communication sends carries out channel decoding; Obtain the 3rd channel decoding result; The difference

of the signal after the outside log-likelihood ratio deinterleaving that the 3rd channel decoding result is corresponding with the modulation signal of the said trunk subscriber equipment transmission of second time slot interweaves; Obtain the 3rd result

that interweaves and interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that the second time slot trunk subscriber equipment of substitution as a result sends, till reaching stopping criterion for iteration the 3rd.

Need to prove that step 407-409 does not have the sequencing on the sequential, can carry out simultaneously.

Carrying out the operation of channel decoding in this step can be carried out by the 3rd channel decoding unit in the base station.

The base station receives first distorted signal from source user equipment at first time slot in the embodiment of the invention; Receive from second distorted signal of source user equipment with from the distorted signal of trunk subscriber equipment at second time slot; Wherein, first distorted signal, second distorted signal are the source user equipment signals after the same modulation signal that first time slot, second time slot send distorts in transmission course respectively; Distorted signal from trunk subscriber equipment is the signal of trunk subscriber equipment after the modulation signal that second time slot sends distorts in transmission course; The signal that the base station utilizes two time slots to receive just can obtain the signal bit sequence before the source user equipment modulation, has saved data transmission period; The mode of while many relayings cooperation transmission, the sensitivity that can improve system obtains higher diversity gain; Further, can under the situation of having only a trunk subscriber equipment,, and obtain tangible error rate improvement for the multiple source subscriber equipment is accomplished relay transmission.

Because the increase of trunk subscriber equipment can increase the diversity gain of whole system; And the quantity of the source user equipment of being cooperated along with each trunk subscriber equipment of increase of trunk subscriber equipment also can reduce, and promptly each trunk subscriber equipment can only need that (information sequence that the individual source user equipment of M＜K) recovers carries out network code and merges to M; But the increase of trunk subscriber equipment also can make the throughput of whole system descend, and therefore, the source user equipment number needs of being cooperated during each trunk subscriber device network coding will be looked the real system situation and decided.

In addition, think the close of trunk subscriber equipment distance sources subscriber equipment generally speaking, channel circumstance is better, and the error rate that trunk subscriber equipment is decoded to the modulation signal of source user equipment broadcasting is low, and receptivity is comparatively desirable.Yet because the mobility of source user equipment, the distance of trunk subscriber equipment distance sources subscriber equipment maybe be far away, and at this moment, if the modulation signal of by force source user equipment being broadcasted is decoded and carried out network code, the performance of system may be relatively poor.Therefore; Can consider when the relaying subscriber equipment can't be decoded the modulation signal of source user equipment broadcasting well; Then do not carry out network code at second time slot, but an independent time slot after second time slot directly sends the modulation signal that first time slot receives.

Based on the consideration of above two aspects, the application proposes a kind of self adaptation multi-source multi-user cooperation transmission method, and this method specifically comprises:

When 601, initially runing, select a network element, and this trunk subscriber equipment is set carries out network code, then can carry out trunk subscriber number of devices K '=1 of network code this moment as trunk subscriber equipment in system; Directly transmit the trunk subscriber number of devices K "=0 of data.

602, whether the reception error rate of new trunk subscriber equipment judgement oneself is less than threshold value, if carry out 603; If, do not carry out 607.

When system initially runed, a selected trunk subscriber equipment was said new trunk subscriber equipment.Wherein, receive the error rate and be meant the error rate of new trunking the modulation signal decoding of source user equipment transmission.

603, new trunk subscriber equipment reports the reception error rate to the base station; The reception error rate that the base station reports according to new trunk subscriber equipment and the position of this trunk subscriber equipment; Confirm the number of the source user equipment that this new trunk subscriber equipment is cooperated, send the indication information of the number of the source user equipment that the said new trunk subscriber equipment of indication cooperated to this new trunk subscriber equipment.

604, new trunk subscriber equipment is according to the indication information of the number of its source user equipment of cooperating of indication; The modulation signal that the source user equipment of the corresponding number that first time slot is received is sent is decoded; Recover signal bit sequence; And to the signal bit sequence that recovers carry out network code, interweave, modulation treatment, send modulation signal at second time slot, carry out 607.

605, new trunk subscriber equipment sends to the base station at the modulation signal that a later time slot of second time slot sends the source user equipment of corresponding number.

606, the base station is provided with K '=K '-1, K "=K "+1.

607, base station judges K '+K " whether be less than or equal to K-1, if, carry out 608, if not, process ends.

608, whether the reception error rate of base station judges base station is less than the predetermined error rate, if carry out 609, if deny process ends.

Concrete, the signal bit sequence of the source user equipment that the base station can obtain according to decoding confirms to receive the error rate.

Optional, this step can judge also whether power system capacity reaches predetermined numerical value, if, execution in step 609, wherein, power system capacity is meant the bit number of the every HZ transmission of system's per second.

609, the non-via node in the reporting system of base station is as new via node, and K '=K '+1 is set, and returns execution in step 602.

Need to prove; If the number of the source user equipment that it is cooperated is not confirmed in the base station for new trunk subscriber equipment; Then each trunk subscriber equipment can be respectively

individual source user equipment collaboration communication; That is, each trunk subscriber equipment carries out network code, interweaves, modulates the back and send modulation signal the signal bit sequence of

individual source user equipment of recovering.Through emulation, as relaying subscriber equipment total quantity K '+K " when equaling source user equipment quantity K, that is, when each trunk subscriber equipment is only cooperated a source user equipment communication, the error rate (bit error ratio, BER) better performances.

The BER performance that Fig. 7 shows network coding cooperation communication mechanism (scene (4SourceUser scenario) with 4 source user equipment is an example) and non-coordination mechanism compares sketch map; Its 4 source user equipment of supposition and 1 trunk subscriber equipment; And duplication code speed is 1/16; Wherein, the Conventional Non-co IDMA scheme among Fig. 7 representes traditional non-collaboration communication interlacing multi-address access mechanism; Cooperation Scheme representes collaboration communication mechanism, and Iteration n representes iteration, n=1,2,3,4 n time.The encoding mechanism of trunk subscriber equipment does

As can be seen from Figure 7, if BER is 2.6 * 10 ^-3, then after 4 iteration, the communication mechanism under the network coding cooperation has the cooperative gain (Cooperation Gain) of 8dbEb/N0 with respect to non-coordination mechanism, it can also be seen that from Fig. 7 in low Eb/N0 zone, the gain of BER performance can be left in the basket.Because in this panel region, the soft information that network encoder obtained is very low.In higher Eb/N0 zone, along with the increase of Eb/N0, the BER performance has higher gain, and this is that soft information gives network decoding value more accurately, thereby obtains tangible diversity gain because in this panel region.

Fig. 8 shows the performance sketch map of the network coding cooperation communication mechanism (scene (1Relay User scenario) with 1 trunk subscriber equipment is an example) based on different source user equipment numbers, the non-collaboration communication interlacing multi-address access mechanism of 4 source user equipment of Non-cooperation IDMA scheme (4Source Users) expression among Fig. 8; The collaboration communication mechanism of k source user equipment of Cooperation Scheme (k Source Users) expression.Suppose that the source user equipment number is K=4,6,8,1 trunk subscriber equipment, and duplication code speed is 1/16, as can beappreciated from fig. 8, along with the increase of source user equipment, the BER performance of network coding cooperation transmission mechanism is descending.Because trunk subscriber equipment need carry out the XOR union operation to the data of source user equipment:

j=1; (N-K), combine and transmission forward once more, composite signal is many more; The user collaboration that obtains divides collection few more, and BER is high more.

Fig. 9 shows the performance impact sketch map of self adaptation multi-source multiuser transmission method to network coding cooperation communication mechanism (scene (4Source User scenario) with 4 source user equipment is an example), and the Conventional Non-co IDMA scheme among Fig. 9 representes traditional non-collaboration communication interlacing multi-address access mechanism; Cooperation Scheme is expressed as collaboration communication mechanism, and Adaptive CooperationScheme representes the adaptive cooperation communication mechanism; Suppose that the source user equipment number is 4; 2 trunk subscriber equipment; And duplication code speed is 1/16; The signal bit sequence of the network code mechanism source user equipment that to be a trunk subscriber obtain all recoveries carries out the network code transmission; It is operating as:

another relaying do not decipher, but transmit at the broadcast data that the 3rd time slot directly receives first time slot.As can beappreciated from fig. 9; Under the situation that improves throughput of system; Taken a time slot though another trunk subscriber equipment of directly transmitting alone more, therefore, in the relay transmission scene after this self adaptation; The BER performance of system is still and has a certain upgrade, especially under the situation of high channel signal to noise ratio.

Consult Figure 10, the embodiment of the invention provides a kind of communication equipment, and this communication equipment can be the base station, and it comprises:

Data Receiving unit 10 is used for the modulation signal in the transmission of the first time slot reception sources subscriber equipment, receives the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; To be said trunk subscriber equipment recover the signal bit sequence of source user equipment from said source user equipment to the modulation signal that said trunk subscriber equipment sends the modulation signal that first time slot sends; Carry out network code according to the signal bit sequence that recovers, and the data that obtain behind the network code are modulated the modulation signal that obtains;

Decoding unit 20 is used to utilize receiving element at the modulation signal of first time slot reception and the modulation signal that receives at second time slot, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

Wherein, if consider the influence of wireless channel to the modulation signal of source user equipment, the transmission of trunk subscriber equipment, Data Receiving unit 10 is used for receiving first distorted signal from source user equipment at first time slot; Receive from second distorted signal of said source user equipment with from the distorted signal of said trunk subscriber equipment at second time slot; Wherein, first distorted signal, second distorted signal are the said source user equipment signals after the same modulation signal that first time slot, second time slot send distorts in transmission course respectively; Distorted signal from said trunk subscriber equipment is the signal of said trunk subscriber equipment after the modulation signal that second time slot sends distorts in transmission course; Wherein, To be trunk subscriber equipment at the modulation signal that second time slot sends recover the signal bit sequence of source user equipment from source user equipment to said trunk subscriber equipment the said modulation signal that first time slot sends; The signal bit sequence that utilization recovers carries out network code, and the data that obtain behind the network code are modulated the modulation signal that obtains; Decoding unit 20 is used to be utilized in the distorted signal of first time slot reception and the distorted signal that receives at second time slot, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

Wherein, decoding unit 20 comprises:

Consult Figure 11, decoding unit 20 comprises:

Multiuser Detection unit 21 is used to obtain the cooperate outside log-likelihood ratio of modulation signal correspondence of a plurality of trunk subscriber equipment transmissions that said i source user equipment communicate by letter of the corresponding outside log-likelihood ratio of modulation signal that corresponding i source user equipment of outside log-likelihood ratio, second time slot of modulation signal that i source user equipment of first time slot send send and second time slot; Concrete, Multiuser Detection unit 21 comprises: the first Multiuser Detection unit, be used to utilize outside log-likelihood ratio computing formula, and obtain the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of first time slot sent; The second Multiuser Detection unit is used to utilize outside log-likelihood ratio computing formula, obtains the corresponding outside log-likelihood ratio of modulation signal that i source user equipment of second time slot sent; With the 3rd Multiuser Detection unit, be used for outside log-likelihood ratio computing formula, obtain the second time slot corresponding outside log-likelihood ratio of modulation signal that a plurality of trunk subscriber equipment of said i source user equipment communication send of cooperating;

Deinterleaving unit 22, the corresponding outside log-likelihood ratio of modulation signal that is used for i source user equipment of first time slot sent carries out deinterleaving; The corresponding outside log-likelihood ratio of modulation signal that i source user equipment of second time slot sent carries out deinterleaving; The corresponding outside log-likelihood ratio of modulation signal that the said a plurality of trunk subscriber equipment of second time slot are sent carries out deinterleaving; Concrete, deinterleaving unit 22 comprises: the first deinterleaving unit, and the corresponding outside log-likelihood ratio of modulation signal that is used for i source user equipment of first time slot sent carries out deinterleaving; The second deinterleaving unit, the corresponding outside log-likelihood ratio of modulation signal that is used for i source user equipment of second time slot sent carries out deinterleaving; With the 3rd deinterleaving unit, be used for the corresponding outside log-likelihood ratio of modulation signal that the said a plurality of trunk subscriber equipment of second time slot send is carried out deinterleaving;

The first network code decoding unit 23; Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used to utilize i source user equipment of first time slot to send and second time slot carries out network and deciphers, and obtains the first network decode results;

Concrete, the first network code decoding unit specifically be used to obtain that each trunk subscriber equipment of said i the source user equipment communication of cooperation is contributed the first kind of i source user equipment and; Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula to obtain to the first kind contribution of i source user equipment in first time slot:

$\log \frac{P(c_i^j=1/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA0000036055690000061.png"\; state="\{\{state\}\}">r</figure-callout>}}_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering; is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and equals 1 probability;

is illustrated under the condition of the modulation signal that trunk subscriber equipment that modulation signal the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and

equals 0 probability.

The second network code decoding unit 24; Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used to utilize i source user equipment of second time slot to send and second time slot carries out network and deciphers, and obtains the second network decode results;

Concrete, the second network code decoding unit specifically is used to obtain the second network decode results and comprises: each the trunk subscriber equipment that obtains said i the source user equipment communication of cooperation to second type of contribution of i source user equipment and; Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula acquisition to second type of contribution of i source user equipment in second time slot:

$\log \frac{P(c_i^j=1/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 0 probability.

Sum unit 25, be used to calculate signal after the outside log-likelihood ratio deinterleaving of the modulation signal correspondence that i the source user equipment of signal, second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i source user equipment of first time slot send send, the first network decode results, the second network decode results and;

Channel decoding unit 26, be used for said sum unit is calculated with carry out channel decoding, obtain the first channel decoding result; Signal after the outside log-likelihood ratio deinterleaving that the modulation signal of i source user equipment transmission of second time slot is corresponding carries out channel decoding, obtains the second channel decode results; The signal that second time slot is cooperated after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that the trunk subscriber equipment of said i source user equipment communication sends carries out channel decoding, obtains the 3rd channel decoding result; Concrete, the channel decoding unit comprises: the first channel decoding unit, be used for said sum unit is calculated with carry out channel decoding, obtain the first channel decoding result; The second channel decoding unit, the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used for i source user equipment of second time slot sent carries out channel decoding, obtains the second channel decode results; With the 3rd channel decoding unit, be used for the signal that second time slot is cooperated after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that the trunk subscriber equipment of said i source user equipment communication sends is carried out channel decoding, obtain the 3rd channel decoding result.

Interleave unit 27, the difference of signal interweaves after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used for i source user equipment of the first channel decoding result and first time slot sent, and obtains first result that interweaves; The difference of the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that i source user equipment of the second channel decode results and second time slot sent interweaves, and obtains second result that interweaves; The difference of the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that the said trunk subscriber equipment of the 3rd channel decoding result and second time slot is sent interweaves, and obtains the 3rd result that interweaves; First result, second result and the 3rd result that interweaves that interweaves that interweaves is fed back to said Multiuser Detection unit; Make said Multiuser Detection unit with the said first corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of first time slot of substitution as a result send that interweaves; With the second corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of second time slot of substitution as a result send that interweaves, with the 3rd corresponding outside log-likelihood ratio computing formula of modulation signal that the second time slot trunk subscriber equipment of substitution as a result sends that interweaves.Concrete; Interleave unit comprises: first interleave unit; The difference of signal interweaves after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used for i source user equipment of the first channel decoding result and first time slot sent, and obtains first the interweave result and feed back to the first Multiuser Detection unit; Second interleave unit; The difference of the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used for i source user equipment of the second channel decode results and second time slot sent interweaves, and obtains second the interweave result and feed back to the second Multiuser Detection unit; With the 3rd interleave unit; The difference of the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used for the said trunk subscriber equipment of the 3rd channel decoding result and second time slot is sent interweaves, and obtains the 3rd interweave result and feed back to the 3rd Multiuser Detection unit.

In order to realize many relayings of self adaptation multi-source collaboration communication mechanism, this communication equipment also comprises:

Judging unit 30 is used for according to the signal bit sequence before the source user equipment modulation of being obtained, and whether the reception error rate of judging communication equipment perhaps, judges whether power system capacity reach predetermined numerical value less than the predetermined error rate;

Signaling transmitting element 40; Be used in the reception error rate of communication equipment less than the predetermined error rate; When perhaps power system capacity reached predetermined numerical value, non-trunk subscriber equipment sent the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in current system.

Said base station also comprises:

Signaling receiving element 50 is used to receive the reception error rate of the said new trunk subscriber equipment that said new trunk subscriber equipment sends;

Confirm unit 60, be used for the reception error rate, confirm the number of the source user equipment that said trunk subscriber equipment is cooperated according to said new trunk subscriber equipment; Wherein, the reception error rate of said new trunk subscriber equipment is to confirm transmission after said oneself the reception error rate reaches predetermined the requirement at said new trunk subscriber equipment;

Said signaling transmitting element 30 also is used for sending to said new trunk subscriber equipment the indication information of the number of the source user equipment that the said new trunk subscriber equipment of indication cooperated.

The modulation signal that the communication equipment of the embodiment of the invention sends at the first time slot reception sources subscriber equipment; Receive the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; The signal that utilizes two time slots to receive just can obtain the signal bit sequence before the source user equipment modulation, has saved data transmission period; The mode of while many relayings cooperation transmission, the sensitivity that can improve system obtains higher diversity gain; Further, can under the situation of having only a trunk subscriber equipment,, and obtain tangible error rate improvement for the multiple source subscriber equipment is accomplished relay transmission.

The embodiment of the invention provides a kind of network system, and it comprises: above-mentioned communication equipment, source user equipment and a plurality of trunk subscriber equipment, wherein,

Said source user equipment is used for sending modulation signal at first time slot, sends said modulation signal at second time slot;

Said trunk subscriber equipment; Be used for recovering the signal bit sequence of source user equipment from the modulation signal that source user equipment is sent at first time slot; The signal bit sequence that utilization recovers carries out network code; And the back data of encoding are modulated, send the modulation signal that modulation obtains at second time slot.

In order to realize self adaptation multi-source multi-user communication mechanism; Said communication equipment also is used for according to the signal bit sequence before the source user equipment modulation of being obtained; Whether the receptivity of judging the base station reaches prerequisite; If non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in current system;

Said new trunk subscriber equipment; Be used to judge whether the reception error rate of oneself reaches threshold value; If, then the modulation signal that first time slot sends, recover the signal bit sequence of source user equipment from source user equipment, utilize the signal bit sequence that recovers to carry out network code; And the back data of encoding are modulated, send the modulation signal that modulation obtains at second time slot; If, source user equipment is not transmitted to the base station at the 3rd time slot in the modulation signal that first time slot sends.Wherein, the 3rd time slot is an independent time slot after second time slot.

The modulation signal that the communication equipment of the embodiment of the invention sends at the first time slot reception sources subscriber equipment; Receive the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; The signal that utilizes two time slots to receive just can obtain the signal bit sequence before the source user equipment modulation, has saved data transmission period; The mode of while many relayings cooperation transmission, the sensitivity that can improve system obtains higher diversity gain; Further, can under the situation of having only a trunk subscriber equipment,, and obtain tangible error rate improvement for the multiple source subscriber equipment is accomplished relay transmission.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; Read-only memory for example, disk or CD etc.

More than many relayings of multi-source collaboration communication method, communication equipment and network system that the embodiment of the invention provided have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (17)

1. the collaboration communication method of the many relayings of multi-source is characterized in that, comprising:

The modulation signal that communication equipment sends at the first time slot reception sources subscriber equipment;

Communication equipment receives the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; To be said trunk subscriber equipment recover the signal bit sequence of source user equipment from said source user equipment to the modulation signal that said trunk subscriber equipment sends the modulation signal that first time slot sends; Carry out network code according to the signal bit sequence that recovers, and the data that obtain behind the network code are modulated the modulation signal that obtains;

Communication equipment is utilized in the modulation signal of first time slot reception and the modulation signal that receives at second time slot, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

2. method according to claim 1 is characterized in that,

Be utilized in the signal of first time slot reception and the signal that receives at second time slot, the signal bit sequence of modulation signal before modulation that obtains said source user equipment transmission comprises:

A, communication equipment obtain signal and second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i the source user equipment of signal, second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i source user equipment of first time slot send the send signal after the outside log-likelihood ratio deinterleaving of modulation signal correspondence of a plurality of trunk subscriber equipment transmissions that i source user equipment communicate by letter of cooperating;

Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that B, communication equipment utilize i source user equipment of first time slot to send and second time slot carries out network and deciphers, and obtains the first network decode results; Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that utilizes i source user equipment of second time slot to send and second time slot carries out network and deciphers, and obtains the second network decode results;

C, communication equipment calculate signal, the first network decode results, the second network decode results after the outside log-likelihood ratio deinterleaving of the modulation signal correspondence that i the source user equipment of signal, second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i source user equipment of first time slot send send carry out channel decoding and; To said with carry out channel decoding, obtain the first channel decoding result.

3. method according to claim 2 is characterized in that,

Obtaining the first network decode results comprises:

Obtain that each trunk subscriber equipment of said i source user equipment communication of cooperation is contributed the first kind of i source user equipment and;

Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula to obtain to the first kind contribution of i source user equipment in first time slot:

$\log \frac{P(c_i^j=1/r_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/r_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and

equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and

equals 0 probability.

4. method according to claim 2 is characterized in that,

Obtaining the second network decode results comprises:

Each the trunk subscriber equipment that obtains said i source user equipment communication of cooperation to second type of contribution of i source user equipment and;

Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula acquisition to second type of contribution of i source user equipment in second time slot:

$\log \frac{P(c_i^j=1/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 0 probability.

5. method according to claim 2 is characterized in that, this method also comprises:

The difference of signal interweaves after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that D, communication equipment send the first channel decoding result and i source user equipment of first time slot; Obtain first result that interweaves, interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of first time slot of substitution as a result send first; Signal after the outside log-likelihood ratio deinterleaving that the modulation signal of i source user equipment transmission of second time slot is corresponding is deciphered, and obtains the second channel decode results; The difference of the signal after the outside log-likelihood ratio deinterleaving that the modulation signal of i source user equipment transmission of the second channel decode results and second time slot is corresponding interweaves; Obtain second result that interweaves, and interweave in the corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of second time slot of substitution as a result send second; The signal that second time slot is cooperated after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that the trunk subscriber equipment of said i source user equipment communication sends carries out channel decoding; Obtain the 3rd channel decoding result; The difference of the signal after the outside log-likelihood ratio deinterleaving that the 3rd channel decoding result is corresponding with the modulation signal of the said trunk subscriber equipment transmission of second time slot interweaves; Obtain the 3rd result that interweaves; Interweave in the corresponding outside log-likelihood ratio operational formula of modulation signal that the second time slot trunk subscriber equipment of substitution as a result sends the 3rd, return order execution in step A, B, C, till satisfying stopping criterion for iteration.

6. method according to claim 1 is characterized in that, this method also comprises:

Communication equipment is when judging that according to the signal bit sequence before the source user equipment modulation of being obtained the reception error rate that obtains communication equipment is less than the predetermined error rate; And when the number of the trunk subscriber equipment in the cooperation communication system during less than the number of source user equipment, non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in cooperation communication system;

Perhaps,

Communication equipment reaches predetermined numerical value in the power system capacity of cooperation communication system; And the number of the trunk subscriber equipment in the cooperation communication system is during less than the number of source user equipment, and non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in cooperation communication system.

7. method according to claim 6 is characterized in that, said method also comprises:

Communication equipment receives the reception error rate of the said new trunk subscriber equipment that said new trunk subscriber equipment sends; According to the reception error rate of said new trunk subscriber equipment, confirm the number of the source user equipment that said new trunk subscriber equipment is cooperated; Wherein, the reception error rate of said new trunk subscriber equipment is that the reception error rate at said new trunk subscriber equipment sends to said communication equipment during less than a threshold value;

Communication equipment sends the indication information of the number of the said new trunk subscriber source user equipment that equipment is cooperated of indication to said new trunk subscriber equipment.

8. a communication equipment is characterized in that, comprising:

The Data Receiving unit is used for the modulation signal in the transmission of the first time slot reception sources subscriber equipment, receives the said modulation signal of said source user equipment transmission and the modulation signal that trunk subscriber equipment sends at second time slot; To be said trunk subscriber equipment recover the signal bit sequence of source user equipment from said source user equipment to the modulation signal that said trunk subscriber equipment sends the modulation signal that first time slot sends; Carry out network code according to the signal bit sequence that recovers, and the data that obtain behind the network code are modulated the modulation signal that obtains;

Decoding unit is used to utilize receiving element at the modulation signal of first time slot reception and the modulation signal that receives at second time slot, obtains the signal bit sequence of modulation signal before modulation that said source user equipment is sent.

9. communication equipment according to claim 8 is characterized in that,

Decoding unit comprises:

The Multiuser Detection unit is used to obtain the cooperate outside log-likelihood ratio of modulation signal correspondence of a plurality of trunk subscriber equipment transmissions that said i source user equipment communicate by letter of the corresponding outside log-likelihood ratio of modulation signal that corresponding i source user equipment of outside log-likelihood ratio, second time slot of modulation signal that i source user equipment of first time slot send send and second time slot;

The deinterleaving unit, the corresponding outside log-likelihood ratio of modulation signal that is used for i source user equipment of first time slot sent carries out deinterleaving; The corresponding outside log-likelihood ratio of modulation signal that i source user equipment of second time slot sent carries out deinterleaving; The corresponding outside log-likelihood ratio of modulation signal that the said a plurality of trunk subscriber equipment of second time slot are sent carries out deinterleaving;

The first network code decoding unit; Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used to utilize i source user equipment of first time slot to send and second time slot carries out network and deciphers, and obtains the first network decode results;

The second network code decoding unit; Cooperate signal after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that a plurality of trunk subscriber equipment that said i source user equipment communicate by letter send of signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used to utilize i source user equipment of second time slot to send and second time slot carries out network and deciphers, and obtains the second network decode results;

Sum unit, be used to calculate signal after the outside log-likelihood ratio deinterleaving of the modulation signal correspondence that i the source user equipment of signal, second time slot after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that i source user equipment of first time slot send send, the first network decode results, the second network decode results and;

The channel decoding unit, be used for said sum unit is calculated with carry out channel decoding, obtain the first channel decoding result.

10. communication equipment according to claim 9 is characterized in that,

The first network code decoding unit, be used to obtain that each trunk subscriber equipment of said i the source user equipment communication of cooperation is contributed the first kind of i source user equipment and;

Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula to obtain to the first kind contribution of i source user equipment in first time slot:

$\log \frac{P(c_i^j=1/r_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/r_1^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and

equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the first time slot communication equipment receives sends receives sends, and equals 0 probability.

11. communication equipment according to claim 9 is characterized in that,

The second network code decoding unit, each the trunk subscriber equipment that is used to obtain said i the source user equipment communication of cooperation to second type of contribution of i source user equipment and;

Wherein, the trunk subscriber equipment of i source user equipment communication of cooperation utilizes following formula acquisition to second type of contribution of i source user equipment in second time slot:

$\log \frac{P(c_i^j=1/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}{P(c_i^j=0/r_2^{\&prime;\mathrm{SD}},r_2^{\&prime;\mathrm{RD}})}$

Wherein,

to be j trunk subscriber equipment carry out the resultant signal of forward error correction coding to the signal bit sequence of i source user equipment recovering;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and equals 1 probability;

is illustrated under the condition of the modulation signal

that trunk subscriber equipment that modulation signal

the second time slot communication equipment that source user equipment that the second time slot communication equipment receives sends receives sends, and

equals 0 probability.

12. communication equipment according to claim 9 is characterized in that,

The channel decoding unit, the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that also is used for i source user equipment of second time slot sent carries out channel decoding, obtains the second channel decode results; The signal that second time slot is cooperated after the corresponding outside log-likelihood ratio deinterleaving of modulation signal that the trunk subscriber equipment of said i source user equipment communication sends carries out channel decoding, obtains the 3rd channel decoding result;

Decoding unit also comprises:

Interleave unit, the difference of signal interweaves after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that is used for i source user equipment of the first channel decoding result and first time slot sent, and obtains first result that interweaves; The difference of the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that i source user equipment of the second channel decode results and second time slot sent interweaves, and obtains second result that interweaves; The difference of the signal after the corresponding outside log-likelihood ratio deinterleaving of the modulation signal that the said trunk subscriber equipment of the 3rd channel decoding result and second time slot is sent interweaves, and obtains the 3rd result that interweaves; First result, second result and the 3rd result that interweaves that interweaves that interweaves is fed back to said Multiuser Detection unit; Make said Multiuser Detection unit with the said first corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of first time slot of substitution as a result send that interweaves; With the second corresponding outside log-likelihood ratio computing formula of modulation signal that i source user equipment of second time slot of substitution as a result send that interweaves, with the 3rd corresponding outside log-likelihood ratio computing formula of modulation signal that the second time slot trunk subscriber equipment of substitution as a result sends that interweaves.

13. communication equipment according to claim 8 is characterized in that, also comprises:

Judging unit is used for according to the signal bit sequence before the source user equipment modulation of being obtained, and whether the reception error rate of judging communication equipment is less than the predetermined error rate; Wherein, said communication equipment is arranged in said cooperation communication system;

The signaling transmitting element; Be used for judged result at judging unit for being; And when the number of the trunk subscriber equipment in the cooperation communication system during less than the number of source user equipment, non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in cooperation communication system;

Perhaps,

Judging unit is used to judge whether the power system capacity of cooperation communication system reaches predetermined numerical value;

The signaling transmitting element; Be used for judged result at judging unit for being; And when the number of the trunk subscriber equipment in the cooperation communication system during less than the number of source user equipment, non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in cooperation communication system.

14. communication equipment according to claim 13 is characterized in that,

Said communication equipment also comprises:

The signaling receiving element is used to receive the reception error rate of the said new trunk subscriber equipment that said new trunk subscriber equipment sends;

Confirm the unit, be used for the reception error rate, confirm the number of the source user equipment that said trunk subscriber equipment is cooperated according to said new trunk subscriber equipment; Wherein, the reception error rate of said new trunk subscriber equipment is that the reception error rate at said new trunk subscriber equipment sends to said communication equipment during less than a threshold value;

Said signaling transmitting element also is used for sending to said new trunk subscriber equipment the indication information of the number of the source user equipment that the said new trunk subscriber equipment of indication cooperated.

15. a cooperation communication system is characterized in that, comprising: each described communication equipment of claim 8-14, source user equipment and a plurality of trunk subscriber equipment, wherein,

Said source user equipment is used for sending modulation signal at first time slot, sends said modulation signal at second time slot;

Said trunk subscriber equipment; Be used for recovering the signal bit sequence of source user equipment from the modulation signal that source user equipment is sent at first time slot; The signal bit sequence that utilization recovers carries out network code; And the data that obtain behind the network code are modulated, send the modulation signal that modulation obtains at second time slot.

16. cooperation communication system according to claim 15 is characterized in that,

Said communication equipment; Also be used for when judging that according to the signal bit sequence before the source user equipment modulation of being obtained the reception error rate that obtains communication equipment is less than the predetermined error rate; And when the number of the trunk subscriber equipment in the cooperation communication system during less than the number of source user equipment, non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in cooperation communication system;

Perhaps,

Said communication equipment; Also be used for reaching predetermined numerical value in the power system capacity of cooperation communication system; And the number of the trunk subscriber equipment in the cooperation communication system is during less than the number of source user equipment, and non-trunk subscriber equipment sends the indication information of the said non-trunk subscriber equipment of indication as new trunk subscriber equipment in cooperation communication system.

17. cooperation communication system according to claim 16 is characterized in that, said cooperation communication system also comprises:

Said new trunk subscriber equipment; Be used to judge whether the reception error rate of new trunk subscriber equipment reaches threshold value; If, then the modulation signal that first time slot sends, recover the signal bit sequence of source user equipment from source user equipment, utilize the signal bit sequence that recovers to carry out network code; And the data that obtain behind the network code are modulated, send the modulation signal that modulation obtains at second time slot; If, source user equipment is not sent to communication equipment at the modulation signal that first time slot sends at the 3rd time slot.

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