CN102780670A - Full-rate multi-hop wireless collaboration relay transmission scheme - Google Patents

Abstract

The invention discloses a multi-hop wireless collaboration relay scheme which can realize full-rate data transmission, and is applicable for a distributed wireless communication network. In the scheme, the data transmission from a source node S to a target node D is finished by three links; each link consists of a plurality of relay node groups in a forwarding mode; the data communication on each link is divided into a plurality of basic transmission processes; distance relay communication can be realized by cascading the basic transmission processes; each basic transmission process consists of three communication stages, a baseband signal transmitted in each communication stage is a modulation symbol obtained by linear complex field coding; each relay node group finishes the forwarding of the received signals by adopting a cycle delay diversity way; and while the high-reliability information transmission is realized, the receiving end only needs to perform joint detection on three symbols, so that the detection complexity is low, and the practical value is high. In addition, in the relay transmission process, if the relay groups in unequal numbers are distributed for the to-be-transmitted information with different priority levels and error code performance requirements, the disclosed multi-hop collaboration relay scheme can be used for the hierarchical transmission of data after being adjusted, so that the transmission quality requirements of a plurality of types of wireless service are met.

Description

Full rate multi-hop wireless cooperating relay transmission scheme

Technical field

The present invention relates to a kind of full rate multi-hop wireless cooperating relay transmission scheme, be applicable to distributed wireless collaboration communication network, can be between the acquisition via node in the potential diversity gain, the expansion relays communication distance, the receiving terminal detection complexity is lower.

Background technology

Professional along with radio multimedium and use fast development; Low-power consumption and DWCS with self-organizing network ability; Be confirmed as the following main framework of building multi-functional " wireless city ", " digital city " network like wireless sensor network, Ad-hoc, Mesh network etc., received the generally attention of domestic and international researcher.Though the practical implementation technology of these network using is slightly variant; But there are many similar parts; As in the design process of physical layer, the communication node that is distributed in diverse geographic location all capable of using is constructed suitable " empty many antennas " system, is realized the message transmission between source node and the destination node with the cooperating relay mode.In recent years, along with the cooperating relay research work continue carry out, though be used to realize that the network topology structure of transmitting is able to become better and approaching perfection day by day, the relay transmission strategy that can satisfy the complex application context communicating requirement still has many shortcoming.Wherein, can realize that the multi-hop cooperating relay scheme of remote message transmission has become the new focus of attention, be worth deeply inquiring into.

Discover that in existing multi-hop cooperating relay scheme, each jumps corresponding transfer of data mostly in time is that order is transmitted.The relay structure of this type has not only increased transmission delay, and is difficult to realize the data communication of two-forty, has wasted valuable radio spectrum resources.In addition, the increase of cooperating relay transmission structure complexity has also brought a series of difficult problems of demanding urgently overcoming, and has weakened the advantage of cooperating relay transmission technology, has delayed its paces of in low power consumption wireless network, applying.

The national inventing patent of having announced " the full rate wireless cooperation relay transmission scheme of low detection complexity " (application number: 201110023040.4) studied the full rate transmission plan that to realize that low complex degree detects; But its work only limits to the double bounce model, the source node transmitting power is non-constant, and communication distance and range of application all receive than limitations.Therefore, how when obtaining the potential diversity gain of distributed system, realizing full rate multi-hop cooperating relay transmission, is a perspective problem that has theory study meaning and actual application value.

Summary of the invention

The present invention combines the relay transmission characteristics of distributed wireless networks; On the basis of design multi-hop relay transmission topological structure; Advantage based on cyclic delay diversity and linear complex field coding techniques; Invented a kind of multi-hop cooperating relay scheme that has low detection complexity and can realize the transmission of highly reliable, full rate, for the physical layer design of distributed wireless collaboration communication network provides reference.

For realizing above technical purpose, concrete technical scheme of the present invention is following:

1, a kind of full rate multi-hop wireless cooperating relay transmission scheme; Be applicable to and in distributed wireless communication network, realize low-power consumption, telecommunication; Mode is made up of a source node S, three communication links and a destination node D; Every communication link is divided into groups to constitute with pass-through mode by a plurality of via nodes, and each communication node all assembles single transmit antenna, carries out exchanges data with semiduplex mode; Data communication on every link is divided into several basic transmission courses, can realize remote trunking traffic through the cascade to a plurality of basic transmission courses; Each is transmitted in basically in three time slots and accomplishes, and the frequency domain symbol sequence that source node transmits in continuous three time slots is respectively S ₁, S ₂, S ₃, the baseband modulation symbol sebolic addressing that behind linear complex field coding, obtains is respectively X ₁, X ₂, X ₃, adopt OFDM (OFDM:Orthogonal Frequency Division Multiplexing) mode to transmit modulation symbol; Source node all can send different pieces of information in three time slots, thereby can realize the cooperating relay transmission of full rate; Via node on every communication link is transmitted to follow-up via node, until destination after dividing into groups to carry out appropriate circulation delay to received signal.

The reception signal of m communication node on the p number of sub-carrier was in 1a) the first jumping place via node divided into groups on the i communication link:

$R_{i1}^m\left(p\right)=\sqrt{P_i}{H}^{{\mathrm{SR}}_{i1}^m}\left(p\right)X_i\left(p\right)+N_{i1}^m\left(p\right),$ p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]

In the formula, P _iBe the transmitting power of source node when the i communication link transmits data, N _FBe OFDM carrier number, M _I1For the communication section in the current via node grouping is counted, Be the frequency domain complex channel fading coefficients of source node to m via node of first jumping place, X _i(p) be X _iIn p transmission symbol, N _i(p) be that average is 0, covariance is N ₀The multiple Gaussian noise of additivity.

The reception signal of n communication node on the p number of sub-carrier was in 1b) the second jumping place via node divided into groups on the i communication link:

$R_{i2}^n\left(p\right)=\mathrm{\α}\sqrt{P_i}\underset{m=1}{\overset{M_{i1}}{\mathrm{\Σ}}}\left(H^{R_{i1}^m{R}_{i2}^n}\left(p\right)H^{{\mathrm{SR}}_{i1}^m}\left(p\right){\mathrm{\ψ}}_m^p\left(X_i\left(p\right)\right)\right)+W_{i2}^n\left(p\right)$

$W_{i2}^n=\mathrm{\α}\underset{m=1}{\overset{M_{i1}}{\mathrm{\Σ}}}{H}^{R_{i1}^m{R}_{i2}^n}\left(p\right)N_{i1}^m\left(p\right)+N_{i2}^n\left(p\right)$

p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]，n∈[1，M _i2]

In the formula, Be power amplification coefficient power amplification ratio, P _I1Be that each via node of first jumping place is transmitted the transmitting power that adopts when receiving signal,

Be the frequency domain complex channel fading coefficients of m via node of first jumping place to n via node of second jumping place,

Be noise,

Be that m via node transmitted the equivalent modulation symbol when receiving signal, by transmitting and the coded system decision.

1c) if the multi-hop relay transmission is merely a basic transmission course, then the reception signal of destination node is on the i communication link:

$R_{\mathrm{iD}}\left(p\right)=\mathrm{\β\α}\sqrt{P_i}\underset{m=1}{\overset{M_{i1}}{\mathrm{\Σ}}}\underset{n=1}{\overset{M_{i2}}{\mathrm{\Σ}}}\left(H_i^{{\mathrm{SR}}_{i1}^m}\left(p\right)H_i^{R_{i1}^m{R}_{i2}^n}\left(p\right)H_i^{R_{i2}^n{D}_i}\left(p\right){\mathrm{\ψ}}_n^p\left({\mathrm{\ψ}}_m^p\left(p\right)\right)\right)+W_{\mathrm{id}}\left(p\right)$

$W_{\mathrm{iD}}\left(p\right)\mathrm{\β\α}\underset{m=1}{\overset{M_{i1}}{\mathrm{\Σ}}}\underset{n=1}{\overset{M_{i2}}{\mathrm{\Σ}}}{H}_i^{R_{i1}^m{R}_{i2}^n}\left(p\right)H_i^{R_{i2}^n{D}_i}\left(p\right)N_{i1}^m\left(p\right)+\mathrm{\β}\underset{n=1}{\overset{M_{i2}}{\mathrm{\Σ}}}{H}_i^{R_{i2}^n{D}_i}\left(p\right)N_{i2}^n\left(p\right)+W_{\mathrm{id}}\left(p\right)$

p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]，n∈[1，M _i2]

In the formula,

Be power amplification coefficient power amplification ratio, P _I2Be that each via node of second jumping place is transmitted the transmitting power that adopts when receiving signal,

Be that n via node of second jumping place is to the frequency domain complex channel fading coefficients between destination node, W _ID(p) be each stage noise and, W wherein _Id(p) be the multiple Gaussian noise of introducing at the destination node place,

Be that n via node of second jumping place transmitted the equivalent modulation symbol when receiving signal.

1d) right

And R _ID(p) noise in carries out normalization to be handled, and obtains following mode:

$\stackrel{\‾}{R_{i1}^m}\left(p\right)\sqrt{c_i\mathrm{\ρ}}{H}^{{\mathrm{SR}}_{i1}^m}\left(p\right)X_i\left(p\right)+V_{i1}$

$\stackrel{\‾}{R_{i2}^n}\left(p\right)=\sqrt{c_{i1}\mathrm{\ρ}}\underset{m=1}{\overset{M_{i1}}{\mathrm{\Σ}}}\left(H^{R_{i1}^m{R}_{i2}^n}\left(p\right)H^{{\mathrm{SR}}_{i1}^m}\left(p\right){\mathrm{\ψ}}_m^p\left(X_i\left(p\right)\right)\right)+V_{i2}$

$\stackrel{\‾}{R_{\mathrm{iD}}}\left(p\right)=\sqrt{c_{i1}{c}_{i2}\mathrm{\ρ}}\underset{m=1}{\overset{M_{i1}}{\mathrm{\Σ}}}\underset{n=1}{\overset{M_{i2}}{\mathrm{\Σ}}}\left(H_i^{{\mathrm{SR}}_{i1}^m}\left(p\right)H_i^{R_{i1}^m{R}_{i2}^n}\left(p\right)H_i^{R_{i2}^n{D}_i}\left(p\right){\mathrm{\ψ}}_n^p\left({\mathrm{\ψ}}_m^p\left(X_i\left(p\right)\right)\right)\right)+V_{\mathrm{iD}}$

SNR＝P/N ₀，P＝P _i+M _i1P _i1+M _i2P _i2

$c_i=\frac{P_i}{P},$ $c_{i1}=\frac{P_{i1}{P}_{i2}}{P(P_i+M_{i1}{P}_{i1}+N_0)}$

$c_{i2}=\frac{P_{i2}(P_i+M_{i1}{P}_{i1}+N_0)}{P_{i1}{P}_{i2}{M}_{i1}{M}_{i2}+M_{i2}{P}_{i2}(P_i+N_0)+(P_i+N_0)(P_{i1}+N_0)}$

In the formula, V _I1, V _I2, V _IDBe that average is 0, covariance is 1 the multiple Gaussian noise of additivity, SNR is a signal to noise ratio.

1e), can realize remote multi-hop relay communication if relay transmission adopts a plurality of basic transmission courses.

2, inherit above-mentioned model, the transmission symbol in each via node is divided into groups on the via node antenna carries out circulation delay, and the transmission symbol on three communication links is carried out combined coding.

2a) in via node divides into groups, the time-domain signal of each communication node is carried out circulation delay; See that from receiving terminal this operation makes the phase place of frequency domain baseband modulation symbol that change take place.

${\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)=e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_m}{X}_i\left(p\right),$ p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]

${\mathrm{\&psi;}}_n^p\left({\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)\right)=e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_n}{\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)=e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_n}\&CenterDot;e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_n}\&CenterDot;e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_m}{X}_i\left(p\right)$

In the formula, Δ _m, Δ _nBe respectively the circulation delay amount that m, n root relay antenna adopt when transmitting the reception signal in first and second jumping place via node grouping, the equivalent channel that such parameters of choice should be used in the receiving terminal detection presents big as far as possible frequency selectivity.

2b) amplify pass-through mode based on circulation delay, the equivalent mode of multi-hop cooperating relay transmission scheme is:

$R=\sqrt{\mathrm{\&rho;}}\mathrm{CH}+V$

$R={\left[\begin{array}{ccc}{\stackrel{\&OverBar;}{R}}_{1D}^T& {\stackrel{\&OverBar;}{R}}_{2D}^T& {\stackrel{\&OverBar;}{R}}_{3D}^T\end{array}\right]}^T$

V＝[V _1D?V _2D?V _3D] ^T

$H=\left[\begin{array}{c}\underset{m=1}{\overset{M_{11}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{12}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{11}^m}{H}_i^{R_{11}^m{R}_{12}^n}{H}_i^{R_{12}^{n}D}{e}^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}({\mathrm{\&Delta;}}_n+{\mathrm{\&Delta;}}_m)}\right)\\ \underset{m=1}{\overset{M_{21}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{22}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{21}^m}{H}_i^{R_{21}^m{R}_{22}^n}{H}_i^{R_{22}^{n}D}{e}^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}({\mathrm{\&Delta;}}_n+{\mathrm{\&Delta;}}_m)}\right)\\ \underset{m=1}{\overset{M_{31}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{32}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{31}^m}{R}_i^{R_{31}^m{R}_{32}^n}{H}_i^{R_{32}^{n}D}{e}^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HSA00000742270300011.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{2\mathrm{\&pi;}}{N_F}({\mathrm{\&Delta;}}_n+{\mathrm{\&Delta;}}_m)}\right)\end{array}\right],$

$C=D\left[\begin{array}{ccc}\sqrt{c_{11}{c}_{12}}& & \\ & \sqrt{c_{21}{c}_{22}}& \\ & & \sqrt{c_{31}{c}_{32}}\end{array}\right],$ $D=\left[\begin{array}{ccc}{X}_1\left(p\right)& & \\ & X_2\left(p\right)& \\ & & X_3\left(p\right)\end{array}\right],$

This model shows that for every communication link, equivalent transmission course is an one dimension, and does not increase with the increase of via node number, and detection complexity is lower.

Be further to excavate potential space diversity gain in each communication link transmission data 2c), can adopt linear complex field coding method that therebetween modulation symbol is carried out combined coding.

[X ₁(p)?X ₂(p)?X ₃(p)] ^T＝Θ·[S ₁(p)?S ₂(p)?S ₃(p)] ^T，p∈[1，N _F]

Θ＝F ₃ ^Hdiag(1，θ，θ ²)

In the formula, Θ is a pre-coding matrix, F ₃ ^HBe 3 * 3 inverse Fourier transform matrix, θ=e ^{J π/4}Because precoding process only carries out at three intersymbols, be to obtain optimum detection performance, receiving terminal also only needs carry out joint-detection to three symbols, and complexity is lower and do not change with the increase of via node number.

3, inherit above-mentioned model, can obtain maximum coding gain for making transmission plan, when given gross power P, given optimal power allocation scheme.

$P_i=\frac{2M_{i1}-\sqrt{M_{i1}}}{3(4M_{i1}-1)}P$

$P_{i1}=\frac{{2M}_{i1}-\sqrt{M_{i1}}}{{3M}_{i1}({4M}_{i1}-1)}P$

$P_{i2}=\frac{2\sqrt{M_{i1}}-1}{{3M}_{i2}({4M}_{i1}-1)}P$

4, inherit above-mentioned model, every communication link is in office, and when the crack all has information to transmit to destination node; Message transmitting procedure between the adjacent communication link has suitable delay; If the relay for packets that priority, error performance require different information distribution communication node numbers to be transmitted not wait, this scheme can be used for realizing the hierarchical transmission of data after adjustment, to satisfy the transmission quality requirements of multiple wireless traffic.

To sum up, the cooperating relay scheme that the present invention relates to can realize full rate, highly reliable message transmission in distributed wireless networks, and effectively promotes the trunking traffic distance, and receiving terminal has lower detection complexity, and practical value is big.

Description of drawings

Fig. 1 is the schematic diagram of the full rate multi-hop wireless cooperating relay transmission scheme of the present invention's proposition.

Fig. 2 compares for the performance of BER of the full rate multi-hop wireless cooperating relay transmission scheme that the present invention proposes.

Embodiment

To combine accompanying drawing that specific embodiments of the present invention is further specified below.

For the sake of simplicity; Only study the full rate multi-hop wireless cooperating relay transmission model that contains a basic transmission course here; As shown in Figure 1, data to be transmitted after error correction coding, Bit Interleave, baseband modulation, is carried out linear complex field coding to modulation symbol at source node in frequency domain; In the test of this instance, the precoding parameter is set to θ=e ^{J π/4}Modulation symbol after the precoding is divided into three parts, after the OFDM modulation, in three adjacent time slots, is sent to three communication links successively by source node; Each group via node will be gone up data that a time slot receives and adopt the circulation delay mode to amplify to subsequent node at next time slot to transmit in each communication link, and the selection of circulation delay amount should be used in the equivalent channel that receiving terminal detects and present big as far as possible frequency selectivity; Modulation system adopts BPSK in the instance, and transmission channel is a frequency-selective channel, OFDM sub-carrier number N _F=256, employing speed is (133,171) convolution code of 1/2, and interchannel noise all is set at the multiple Gaussian noise of additivity.

Bit error rate (the BER:Bit Error Rate) performance that is illustrated in figure 2 as the full rate multi-hop wireless cooperating relay transmission scheme of the present invention's proposition compares.The multipath number of frequency-selective channel is made as 3, adopts the average power allocation method of equal transmit power to compare with source node and each via node, and the performance of BER under the optimal power allocation strategy is higher; Along with the increase of node number, the relay transmission scheme of proposition can obtain higher diversity gain and lower bit error rate.

Claims (4)

1. full rate multi-hop wireless cooperating relay transmission scheme; Be applicable to and in distributed wireless communication network, realize low-power consumption, telecommunication; It is characterized in that: mode is made up of a source node S, three communication links and a destination node D; Every communication link is divided into groups to constitute with pass-through mode by a plurality of via nodes, and each communication node all assembles single transmit antenna, carries out exchanges data with semiduplex mode; Data communication on every link is divided into several basic transmission courses, can realize remote trunking traffic through the cascade to a plurality of basic transmission courses; Each is transmitted in basically in three time slots and accomplishes, and the frequency domain symbol sequence that source node transmits in continuous three time slots is respectively S ₁, S ₂, S ₃, the baseband modulation symbol sebolic addressing that behind linear complex field coding, obtains is respectively X ₁, X ₂, X ₃, adopt OFDM (OFDM:Orthogonal Frequency Division Multiplexing) mode to transmit modulation symbol; Source node all can send different pieces of information in three time slots, thereby can realize the cooperating relay transmission of full rate; Via node on every communication link is transmitted to follow-up via node, until destination after dividing into groups to carry out appropriate circulation delay to received signal.

The reception signal of m communication node on the p number of sub-carrier was in 1a) the first jumping place via node divided into groups on the i communication link:

$R_{i1}^m\left(p\right)=\sqrt{P_i}{H}^{{\mathrm{SR}}_{i1}^m}\left(p\right)X_i\left(p\right)+N_{i1}^m\left(p\right),$ p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]

In the formula, P _iBe the transmitting power of source node when the i communication link transmits data, N _FBe OFDM carrier number, M _I1For the communication section in the current via node grouping is counted,

Be the frequency domain complex channel fading coefficients of source node to m via node of first jumping place, X _i(p) be X _iIn p transmission symbol, N _i(p) be that average is 0, covariance is N ₀The multiple Gaussian noise of additivity.

The reception signal of n communication node on the p number of sub-carrier was in 1b) the second jumping place via node divided into groups on the i communication link:

$R_{i2}^n\left(p\right)=\mathrm{\&alpha;}\sqrt{P_i}\underset{m=1}{\overset{M_{i1}}{\mathrm{\&Sigma;}}}\left(H^{R_{i1}^m{R}_{i2}^n}\left(p\right)H^{{\mathrm{SR}}_{i1}^m}\left(p\right){\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)\right)+W_{i2}^n\left(p\right)$

$W_{i2}^n=\mathrm{\&alpha;}\underset{m=1}{\overset{M_{i1}}{\mathrm{\&Sigma;}}}{H}^{R_{i1}^m{R}_{i2}^n}\left(p\right)N_{i1}^m\left(p\right)+N_{i2}^n\left(p\right)$

p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]，n∈[1，M _i2]

In the formula,

Be power amplification coefficient power amplification ratio, P _I1Be that each via node of first jumping place is transmitted the transmitting power that adopts when receiving signal,

Be the frequency domain complex channel fading coefficients of m via node of first jumping place to n via node of second jumping place, Be noise, Be that m via node transmitted the equivalent modulation symbol when receiving signal, by transmitting and the coded system decision.

1c) if the multi-hop relay transmission is merely a basic transmission course, then the reception signal of destination node is on the i communication link:

$R_{\mathrm{iD}}\left(p\right)=\mathrm{\&beta;\&alpha;}\sqrt{P_i}\underset{m=1}{\overset{M_{i1}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{i2}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{i1}^m}\left(p\right)H_i^{R_{i1}^m{R}_{i2}^n}\left(p\right)H_i^{R_{i2}^n{D}_i}\left(p\right){\mathrm{\&psi;}}_n^p\left({\mathrm{\&psi;}}_m^p\left(p\right)\right)\right)+W_{\mathrm{id}}\left(p\right)$

$W_{\mathrm{iD}}\left(p\right)\mathrm{\&beta;\&alpha;}\underset{m=1}{\overset{M_{i1}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{i2}}{\mathrm{\&Sigma;}}}{H}_i^{R_{i1}^m{R}_{i2}^n}\left(p\right)H_i^{R_{i2}^n{D}_i}\left(p\right)N_{i1}^m\left(p\right)+\mathrm{\&beta;}\underset{n=1}{\overset{M_{i2}}{\mathrm{\&Sigma;}}}{H}_i^{R_{i2}^n{D}_i}\left(p\right)N_{i2}^n\left(p\right)+W_{\mathrm{id}}\left(p\right)$

p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]，n∈[1，M _i2]

In the formula,

Be power amplification coefficient power amplification ratio, P _I2Be that each via node of second jumping place is transmitted the transmitting power that adopts when receiving signal,

Be that n via node of second jumping place is to the frequency domain complex channel fading coefficients between destination node, W _ID(p) be each stage noise and, W wherein _Id(p) be the multiple Gaussian noise of introducing at the destination node place,

Be that n via node of second jumping place transmitted the equivalent modulation symbol when receiving signal.

1d) right

And R _ID(p) noise in carries out normalization to be handled, and obtains following mode:

$\stackrel{\&OverBar;}{R_{i1}^m}\left(p\right)\sqrt{c_i\mathrm{\&rho;}}{H}^{{\mathrm{SR}}_{i1}^m}\left(p\right)X_i\left(p\right)+V_{i1}$

$\stackrel{\&OverBar;}{R_{i2}^n}\left(p\right)=\sqrt{c_{i1}\mathrm{\&rho;}}\underset{m=1}{\overset{M_{i1}}{\mathrm{\&Sigma;}}}\left(H^{R_{i1}^m{R}_{i2}^n}\left(p\right)H^{{\mathrm{SR}}_{i1}^m}\left(p\right){\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)\right)+V_{i2}$

$\stackrel{\&OverBar;}{R_{\mathrm{iD}}}\left(p\right)=\sqrt{c_{i1}{c}_{i2}\mathrm{\&rho;}}\underset{m=1}{\overset{M_{i1}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{i2}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{i1}^m}\left(p\right)H_i^{R_{i1}^m{R}_{i2}^n}\left(p\right)H_i^{R_{i2}^n{D}_i}\left(p\right){\mathrm{\&psi;}}_n^p\left({\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)\right)\right)+V_{\mathrm{iD}}$

SNR＝P/N ₀，P＝P _i+M _i1P _i1+M _i2P _i2

$c_i=\frac{P_i}{P},$ $c_{i1}=\frac{P_{i1}{P}_{i2}}{P(P_i+M_{i1}{P}_{i1}+N_0)}$

$c_{i2}=\frac{P_{i2}(P_i+M_{i1}{P}_{i1}+N_0)}{P_{i1}{P}_{i2}{M}_{i1}{M}_{i2}+M_{i2}{P}_{i2}(P_i+N_0)+(P_i+N_0)(P_{i1}+N_0)}$

In the formula, V _I1, V _I2, V _IDBe that average is 0, covariance is 1 the multiple Gaussian noise of additivity, SNR is a signal to noise ratio.

1e), can realize remote multi-hop relay communication if relay transmission adopts a plurality of basic transmission courses.

2. according to the model of claim 1, it is characterized in that: the transmission symbol in each via node is divided into groups on the via node antenna carries out circulation delay, and the transmission symbol on three communication links is carried out combined coding.

2a) in via node divides into groups, the time-domain signal of each communication node is carried out circulation delay; See that from receiving terminal this operation makes the phase place of frequency domain baseband modulation symbol that change take place.

${\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)=e^{-j\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_m}{X}_i\left(p\right),$ p∈[1，N _F]，i∈[1，3]，m∈[1，M _i1]

${\mathrm{\&psi;}}_n^p\left({\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)\right)=e^{-j\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_n}{\mathrm{\&psi;}}_m^p\left(X_i\left(p\right)\right)=e^{-j\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_n}\&CenterDot;e^{-j\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_n}\&CenterDot;e^{-j\frac{2\mathrm{\&pi;}}{N_F}{\mathrm{p\&Delta;}}_m}{X}_i\left(p\right)$

In the formula, Δ _m, Δ _nBe respectively the circulation delay amount that m, n root relay antenna adopt when transmitting the reception signal in first and second jumping place via node grouping, the equivalent channel that such parameters of choice should be used in the receiving terminal detection presents big as far as possible frequency selectivity.

2b) amplify pass-through mode based on circulation delay, the equivalent mode of multi-hop cooperating relay transmission scheme is:

$R=\sqrt{\mathrm{\&rho;}}\mathrm{CH}+V$

$R={\left[\begin{array}{ccc}{\stackrel{\&OverBar;}{R}}_{1D}^T& {\stackrel{\&OverBar;}{R}}_{2D}^T& {\stackrel{\&OverBar;}{R}}_{3D}^T\end{array}\right]}^T$

V＝[V _1D?V _2D?V _3D] ^T

$H=\left[\begin{array}{c}\underset{m=1}{\overset{M_{11}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{12}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{11}^m}{H}_i^{R_{11}^m{R}_{12}^n}{H}_i^{R_{12}^{n}D}{e}^{-j\frac{2\mathrm{\&pi;}}{N_F}({\mathrm{\&Delta;}}_n+{\mathrm{\&Delta;}}_m)}\right)\\ \underset{m=1}{\overset{M_{21}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{22}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{21}^m}{H}_i^{R_{21}^m{R}_{22}^n}{H}_i^{R_{22}^{n}D}{e}^{-j\frac{2\mathrm{\&pi;}}{N_F}({\mathrm{\&Delta;}}_n+{\mathrm{\&Delta;}}_m)}\right)\\ \underset{m=1}{\overset{M_{31}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{M_{32}}{\mathrm{\&Sigma;}}}\left(H_i^{{\mathrm{SR}}_{31}^m}{R}_i^{R_{31}^m{R}_{32}^n}{H}_i^{R_{32}^{n}D}{e}^{-j\frac{2\mathrm{\&pi;}}{N_F}({\mathrm{\&Delta;}}_n+{\mathrm{\&Delta;}}_m)}\right)\end{array}\right],$

$C=D\left[\begin{array}{ccc}\sqrt{c_{11}{c}_{12}}& & \\ & \sqrt{c_{21}{c}_{22}}& \\ & & \sqrt{c_{31}{c}_{32}}\end{array}\right],$ $D=\left[\begin{array}{ccc}{X}_1\left(p\right)& & \\ & X_2\left(p\right)& \\ & & X_3\left(p\right)\end{array}\right],$

This model shows that for every communication link, equivalent transmission course is an one dimension, and does not increase with the increase of via node number, and detection complexity is lower.

Be further to excavate potential space diversity gain in each communication link transmission data 2c), can adopt linear complex field coding method that therebetween modulation symbol is carried out combined coding.

[X ₁(p)?X ₂(p)?X ₃(p)] ^T＝Θ·[S ₁(p)?S ₂(p)?S ₃(p)] ^T，p∈[1，N _F]

Θ＝F ₃ ^Hdiag(1，θ，θ ²)

In the formula, Θ is a pre-coding matrix, F ₃ ^HBe 3 * 3 inverse Fourier transform matrix, θ=e ^{J π/4}Because precoding process only carries out at three intersymbols, be to obtain optimum detection performance, receiving terminal also only needs carry out joint-detection to three symbols, and complexity is lower and do not change with the increase of via node number.

3. according to the model of claim 1, it is characterized in that: can obtain maximum coding gain for making transmission plan, when given gross power P, given optimal power allocation scheme.

$P_i=\frac{2M_{i1}-\sqrt{M_{i1}}}{3(4M_{i1}-1)}P$

$P_{i1}=\frac{{2M}_{i1}-\sqrt{M_{i1}}}{{3M}_{i1}({4M}_{i1}-1)}P$

$P_{i2}=\frac{2\sqrt{M_{i1}}-1}{{3M}_{i2}({4M}_{i1}-1)}P$

4. according to the model of claim 1, it is characterized in that: every communication link is in office, and when the crack all has information to transmit to destination node; Message transmitting procedure between the adjacent communication link has suitable delay; If the relay for packets that priority, error performance require different information distribution communication node numbers to be transmitted not wait, this scheme can be used for realizing the hierarchical transmission of data after adjustment, to satisfy the transmission quality requirements of multiple wireless traffic.

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