CN101958769B - Pilot frequency transmission method and relay equipment - Google Patents

Abstract

The embodiment of the invention discloses a pilot frequency transmission method and relay equipment, which belong to the technical field of wireless communication. The method comprises that a relay processes received data information and pilot frequency information and transmits the processed data information to a receiver in a space-frequency block code mode and processed pilot frequency information to the receiver in an orthogonal mode. The relay equipment comprises a processing module and a transmitting module. The technical scheme provided by the embodiment of the invention can improve transmission performance and enables the receiver to estimate comprehensive link channel information.

Description

Pilot frequency transmission method and trunking

Technical field

The present invention relates to wireless communication field, particularly a kind of pilot frequency transmission method and trunking.

Background technology

Develop rapidly along with radio communication service, future network need to be supported with the layout designs of least cost the communication of blind spot area or hot zones, better covering or system throughput are provided, therefore introduced relaying technique, relaying technique is to send after using the relay that the signal of transmitting terminal is processed again again.Use the coverage that multi-hop relay can Extended Cell, reduce the blind spot area in the communication, simultaneously can also balanced load, shift the business of hot zones.Relaying technique can be regenerative repeating and non-regenerative relaying, and the technology of non-regenerative relaying is that signal does not need just to be sent by the relay through digitized processing, and the technology of regenerative repeating is to send after need to decoding, encode signal in the relay again.

At present in the regenerative repeating pilot transmission technology, transmitting terminal and relay can send respectively independently pilot frequency information, and in the non-regenerative relaying pilot transmission technology, the pilot frequency information of transmitting terminal can directly be transmitted in the relay, thereby the acquisition repeated link, the channel information of access link and comprehensive link.

Non-regenerative relaying need not decoding than the regenerative repeating technology, has the advantage of low time delay, thereby becomes one of relaying technique study hotspot.Yet in the non-regenerative relaying technology, the scheme of the pilot frequency information of transmitting terminal is directly transmitted in the relay, be only applicable to the non-regenerative relaying system of amplification forwarding, and the transmission performance of the non-regenerative relaying system of amplification forwarding is lower; If data message and pilot frequency information are processed to improve transmission performance, because before and after processing, variation has occured in data message and pilot frequency information, and direct data and the pilot frequency information behind the forward process more then can not be realized the channel estimating of comprehensive link at receiving terminal.

Summary of the invention

The embodiment of the invention provides a kind of pilot frequency transmission method and trunking.Described technical scheme is as follows:

The embodiment of the invention provides a kind of pilot frequency transmission method, and described method comprises:

Process the data message and the pilot frequency information that receive the relay;

Data message after processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information after will processing sends to receiving terminal with orthogonal manner;

Data message after described will the processing sends to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information after will processing sends to receiving terminal with orthogonal manner, specifically comprises:

The relay sends data message in the SFBC mode respectively on two transmitting antennas, and the data message that sends respectively on described two transmitting antennas is:

The relay sends respectively orthogonal guide frequency information on two transmitting antennas, and the orthogonal guide frequency information that sends respectively on described two transmitting antennas is:

Wherein, ρ is the power amplifier factor of amplifirer, and a is the merging gain of the data message that receives of relay and pilot frequency information, s ₁And s ₂Be the data message that transmitting terminal sends, n ₁And n ₂Be additive noise corresponding to data message, P is the pilot frequency information that transmitting terminal sends, and n is additive noise corresponding to pilot frequency information.

The embodiment of the invention provides a kind of pilot frequency transmission method, and described method comprises:

Process the data message that receives the relay;

Data message after processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that the relay is produced sends to receiving terminal with orthogonal manner;

Wherein, the data message after processing is sent to before the receiving terminal in space-time/frequency block code SFBC mode, described method also comprises:

The pilot frequency information of receiving is processed;

According to the pilot frequency information after processing the data message after processing is carried out preequalization;

Data message after described will the processing sends to receiving terminal in space-time/frequency block code SFBC mode, comprising:

Data message behind the preequalization is sent to receiving terminal in space-time/frequency block code SFBC mode.

The embodiment of the invention provides a kind of trunking, and described trunking comprises:

Processing module is used for the data message and the pilot frequency information that receive are processed;

Sending module be used for the described data message after the described processing module processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the described pilot frequency information after will processing sends to receiving terminal with orthogonal manner;

Wherein, described sending module be used for sending data message in the SFBC mode respectively on two transmitting antennas, and the data message that sends respectively on described two transmitting antennas is:

Described processing module be used for sending respectively orthogonal guide frequency information on two transmitting antennas, and the orthogonal guide frequency information that sends respectively on described two transmitting antennas is:

Wherein, ρ is the power amplifier factor of amplifirer, and a is the merging gain of the data message that receives of relay and pilot frequency information, s ₁And s ₂Be the data message that transmitting terminal sends, n ₁And n ₂Be additive noise corresponding to data message, P is the pilot frequency information that transmitting terminal sends, and n is additive noise corresponding to pilot frequency information.

The embodiment of the invention provides a kind of trunking, and described trunking comprises:

Processing module is used for the data message that receives is processed;

Generation module is for generation of pilot frequency information;

Sending module be used for the data message after the described processing module processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that described generation module is produced sends to receiving terminal with orthogonal manner;

Wherein, described processing module also is used for the pilot frequency information of receiving is processed, and described trunking also comprises:

The preequalization module is used for according to the pilot frequency information after the described processing module processing data message after processing being carried out preequalization;

Described sending module be used for the data message behind the described preequalization module preequalization is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that described generation module is produced sends to receiving terminal with orthogonal manner.

The beneficial effect of the technical scheme that the embodiment of the invention provides is: receive data message and pilot frequency information that transmitting terminal sends, the data message after processing is transmitted to receiving terminal with diversity mode, make the relay system transmission obtain diversity gain, improved transmission performance; Owing to data message and pilot frequency information are processed, are made data message obtain identical channel gain with pilot frequency information, thereby can make receiving terminal realize the channel estimating of comprehensive link.

Description of drawings

Fig. 1 is the pilot frequency transmission method schematic flow sheet that one embodiment of the present of invention provide;

Fig. 2 is pilot transmission schematic diagram in the double bounce non-regenerative relaying system that provides of one embodiment of the present of invention;

Fig. 3 is the pilot transmission schematic diagram that transmitting terminal consists of orthogonal guide frequency information in the double bounce non-regenerative relaying system that provides of one embodiment of the present of invention;

Fig. 4 is the pilot frequency transmission method schematic flow sheet that an alternative embodiment of the invention provides;

Fig. 5 is the pilot frequency transmission method schematic flow sheet that another embodiment of the present invention provides;

Fig. 6 is pilot transmission schematic diagram in the double bounce non-regenerative relaying system that provides of one embodiment of the present of invention;

Fig. 7 is the pilot frequency transmission method schematic flow sheet that another embodiment of the present invention provides;

Fig. 8 is the pilot transmission schematic diagram that preequalization is provided data message in the double bounce non-regenerative relaying system that provides of one embodiment of the present of invention;

Fig. 9 is the trunking structural representation that one embodiment of the present of invention provide;

Figure 10 is the trunking structural representation that an alternative embodiment of the invention provides;

Figure 11 is the trunking structural representation that another embodiment of the present invention provides.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.

Referring to Fig. 1, one embodiment of the present of invention provide a kind of pilot frequency transmission method, and the method comprises:

101: process the data message and the pilot frequency information that receive the relay;

102: the data message after will processing is diversity mode with space-time/frequency block code SFBC (Space-Frequency Block Coding, space-time/frequency block code), and the pilot frequency information after the processing sends to receiving terminal with orthogonal manner, makes receiving terminal obtain diversity gain.

The beneficial effect of the embodiment of the invention is: diversity mode forwarding data information is adopted in the relay, makes the relay system transmission obtain diversity gain; Data message and pilot frequency information are processed, made data message obtain identical channel gain with pilot frequency information, thereby can make receiving terminal realize the channel estimating of comprehensive link.

An alternative embodiment of the invention provides a kind of pilot frequency transmission method, and the method comprises:

201: process the data message and the pilot frequency information that receive the relay, this data message is weighted the first data message by transmitting terminal through beamforming vectors, and the process transmission is to the relay, this pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and the process transmission is to the relay.

For example, referring to the double bounce non-regenerative relaying system of Fig. 2, transmitting terminal has N _T=4 transmitting antennas, the relay has Individual reception antenna and

Two transmitting antennas, receiving terminal has N _R=1 reception antenna.The armed data message of transmitting terminal is the first data message, is S=[s ₀, s ₁, s ₂...] ^T, the first pilot frequency information is beam forming dedicated pilot P, transmitting terminal with the first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the data message received of relay is:

y _R＝aS+N (1)

A=W wherein ^TH is scalar, N=[n ₀, n ₁, n ₂...] and be the additive noise vector;

Transmitting terminal with the first pilot frequency information P of beam forming special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the pilot frequency information received of relay is:

y _P＝aP+n _P (2)

N wherein _PBe additive noise corresponding to pilot frequency information, and additive noise corresponding to data message has same distribution.

Can be found out that by formula (1) and (2) data message that receive the relay has identical merging gain a with pilot frequency information.

Wherein, pilot frequency information also can be weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, then obtains through transmission.

Referring to Fig. 3, because transmitting terminal is with the first pilot frequency information P ₀After 0 formation orthogonal guide frequency information, be weighted transmitting terminal N through beamforming vectors again _TThe pilot frequency information that sends on each transmitting antenna of individual transmitting antenna is:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l(l=1,...N_T)---\left(3\right)$

In order to realize that data message and pilot frequency information obtain identical merging gain, the relay is with the N that receives _TIndividual pilot frequency information is through after the base band signal process, and addition obtains pilot frequency information P ':

$P^{\&prime;}=\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l={\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">P</figure-callout>}}_0\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{h}_l+\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{n}_l=\mathrm{\&alpha;}{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">P</figure-callout>}}_0+n^{\&prime;\&prime;}---\left(4\right)$

Wherein

Obviously, the noise variance of pilot frequency information P ' is the N of noise variance corresponding to data message _TDoubly, therefore, for fear of the decline of channel estimating performance, can be the N of traditional design with the pilot frequency information energy lift in the present embodiment _TDoubly, i.e. P _P0=N _TP _P

FFT (Fast Fourier Transform, fast fourier transform), string and conversion, the Base-Band Processing such as packet are carried out to receiving data message and pilot frequency information in the relay.

202: the data message after the relay will be processed sends to receiving terminal in the SFBC mode, will send to receiving terminal behind the pilot frequency information quadrature after processing.

Data message y after the relay will be processed _RSend with two transmitting antennas of SFBC mode from the relay, with the pilot frequency information y after processing _PSend behind the quadrature.In the present embodiment, can also be through an amplifirer when relay sends data message and pilot frequency information, this amplifirer can be adjusted the signal transmission power of relay, and the power amplifier factor of establishing this amplifirer is ρ;

Referring to Fig. 2, the data message that sends respectively on two transmitting antennas of relay is:

The orthogonal guide frequency information that sends respectively on two transmitting antennas of relay is:

Parameter b among Fig. 2 is not for considering the coefficient under the noise situations, as can be seen from Figure 2, coefficient before the data message that has just received the relay and the pilot frequency information is a, during transmission because through amplifirer, coefficient before data message and the pilot frequency information occur variation, namely become b by coefficient a, b=a ρ, wherein a and ρ are respectively plural number and real number.

In addition, when the number of transmit antennas of relay

The time, can select corresponding SFBC send mode in conjunction with concrete antenna number, for example when the transmitting antenna of relay is 4, can adopt the send mode of SFBC and FSTD (Frequency SwitchedTransmit Diversity, frequency domain switching emission diversity).

In this relay system, the reception antenna of relay The time, the data message after processing is sent to before the receiving terminal in space-time/frequency block code SFBC mode, the relay can estimate first the equivalent channels information of repeated link according to the pilot frequency information after processing, establish

Be the equivalent channels information of estimating:

$y_P=W^T{H}_{r}P+n_P={\tilde{h}}^{r}P+n_P---\left(7\right)$

Can be drawn by formula (7):

${\tilde{h}}^r=W^T{H}_r(r=\mathrm{1,2},...N_R^r)---\left(8\right)$

Again with

Data message after the processing of relay and pilot frequency information are carried out respectively MRC (Maximum RatioCombining, high specific merges), so that the gain a in the formula (2) becomes

$a=\underset{r=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}^r\right|}^2=\underset{r=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|W^T{H}_r\right|}^2---\left(9\right)$

H in the formula _rBe the transmission matrix of transmitting terminal to relay reception antenna r.

Wherein, the method can also comprise:

Receiving terminal receives the second data message and the second pilot frequency information, and this second data message is that the data message that the relay sends obtains through transmission, and the second pilot frequency information is that the orthogonal guide frequency information that the relay sends obtains through transmission;

Estimate the channel information of comprehensive link according to the second pilot frequency information, and with the channel information that estimates the second data message of receiving is carried out MRC.

Concrete, the data message that the relay sends and pilot frequency information are through transmission matrix G=[g ₁, g ₂] ^TArrive receiving terminal, behind the arrival receiving terminal, data message and pilot frequency information become respectively the second data message and the second pilot frequency information; After receiving terminal was received the second data message and the second pilot frequency information, according to emitting structural, the pilot frequency information correspondence position of relay, the channel information that estimates respectively 2 * 1 comprehensive links was:

$\left\{\begin{array}{c}{\tilde{h}}_1=a{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}+{\tilde{n}}_1\\ {\tilde{h}}_2=a^{*}{g}_2\mathrm{\&rho;}+{\tilde{n}}_2\end{array}\right.---\left(10\right)$

Again with

With

The second data message that receives is carried out MRC, obtains:

$\left\{\begin{array}{c}{y}_s^1=({\left|{\mathrm{<figure-callout\; id="1"\; label="ag"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">ag</figure-callout>}}_1\mathrm{\&rho;}\right|}^2+{\left|a^{*}{g}_2\mathrm{\&rho;}\right|}^2){\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1+{\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">n</figure-callout>}}_1^{\&prime;}\\ y_s^2=({\left|{\mathrm{<figure-callout\; id="1"\; label="ag"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">ag</figure-callout>}}_1\mathrm{\&rho;}\right|}^2+{\left|a^{*}{g}_2\mathrm{\&rho;}\right|}^2)s_2+n_2^{\&prime;}\end{array}\right.---\left(11\right)$

The beneficial effect of the embodiment of the invention is: receive data message and pilot frequency information that transmitting terminal sends with beam forming, adopt diversity mode forwarding data information, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Data message and pilot frequency information are processed, made data message obtain identical channel gain with pilot frequency information, thereby can make receiving terminal realize the channel estimating of comprehensive link; Two-hop link for diversity forward relay system, since the first link information of jumping implicit band on the first pilot frequency information of jumping, when transmit the relay, receiving terminal just carried the channel information of two-hop link on this pilot frequency information, so only need utilize pilot frequency information to estimate once just can obtain comprehensive link channel information; For the beam forming scheme, the first pilot frequency information can be selected the beam forming dedicated pilot, also can select orthogonal guide frequency, has increased the mode of the pilot frequency information that sends.

Referring to Fig. 4, an alternative embodiment of the invention provides a kind of pilot frequency transmission method, and the method comprises:

301: process the data message and the pilot frequency information that receive the relay; This data message is weighted the first data message by transmitting terminal through beamforming vectors, and the process transmission is to the relay, this pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and the process transmission is to the relay.

For example, referring to the double bounce non-regenerative relaying system of Fig. 3, transmitting terminal has N _T=4 transmitting antennas, the relay has

Individual reception antenna and

Two transmitting antennas, receiving terminal has N _R=1 reception antenna.The armed data message of transmitting terminal is the first data message, is S=[s ₀, s ₁, s ₂...] ^T, the first pilot frequency information is beam forming dedicated pilot P, transmitting terminal with the first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the data message received of relay is:

y _R＝aS+N (12)

A=W wherein ^TH is scalar, N=[n ₀, n ₁, n ₂...] and be the additive noise vector;

Transmitting terminal with the first pilot frequency information P of beam forming special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the pilot frequency information received of relay is:

y _P＝aP+n _P (13)

N wherein _PBe additive noise corresponding to pilot frequency information, and additive noise corresponding to data message has same distribution.

Can be found out that by formula (12) and (13) data message that receive the relay has identical merging gain a with pilot frequency information.

Wherein, pilot frequency information also can be weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, then obtains through transmission.

Referring to Fig. 3, because transmitting terminal is with the first pilot frequency information P ₀After 0 formation orthogonal guide frequency information, be weighted transmitting terminal N through beamforming vectors again _TThe pilot frequency information that sends on each transmitting antenna of individual transmitting antenna is:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l(l=1,...,N_T)---\left(14\right)$

In order to realize that data message and pilot frequency information obtain identical merging gain, the relay is with the N that receives _TIndividual pilot frequency information is through after the base band signal process, and addition obtains pilot frequency information P ':

$P^{\&prime;}=\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l={\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">P</figure-callout>}}_0\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{h}_l+\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{n}_l=\mathrm{\&alpha;}{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">P</figure-callout>}}_0+n^{\&prime;\&prime;}---\left(15\right)$

Wherein

Obviously, the noise variance of pilot frequency information P ' is the N of noise variance corresponding to data message _TDoubly, therefore, for fear of the decline of channel estimating performance, can be the N of traditional design with the pilot frequency information energy lift in the present embodiment _TDoubly, i.e. P _P0=N _TP _P

FFT (Fast Fourier Transform, fast fourier transform), string and conversion, the Base-Band Processing such as packet are carried out to receiving data message and pilot frequency information in the relay.

302: according to the pilot frequency information after processing the data message after processing is carried out preequalization;

1〉concrete, as data message y _RDuring=aS+N,

By the pilot frequency information y after processing _P=aP+n _PEstimate to draw gain a,

Again to the y after processing _R=aS+N preequalization, the data message behind the preequalization becomes:

2〉by the pilot frequency information P ' after processing=α P ₀+ n " estimates to draw gain

Again to the data message y after processing _R=aS+N preequalization, the data message behind the preequalization becomes

303: the data message behind the preequalization is sent to receiving terminal in space-time/frequency block code SFBC mode, send to receiving terminal behind the pilot frequency information quadrature with the relay generation.

The data message y of relay after with preequalization _RSend with two transmitting antennas of SFBC mode from the relay, send behind the pilot frequency information quadrature that the relay produces self.In the present embodiment, can also be through an amplifirer during pilot frequency information of the data message behind the relay transmission preequalization and relay oneself generation of quadrature, this amplifirer can be adjusted the signal transmission power of relay, and the power amplifier factor of establishing this amplifirer is ρ; Data message is carried out in the situation of preequalization, the data message that then sends respectively on two of Fig. 2 relay transmitting antennas is:

The orthogonal guide frequency information that sends respectively on two transmitting antennas of relay is:

In addition, when the number of transmit antennas of relay

The time, can select corresponding SFBC send mode in conjunction with concrete antenna number, for example when the transmitting antenna of relay is 4, can adopt the send mode of SFBC and FSTD.In this relay system, the reception antenna of relay

The time, the data message behind the preequalization is sent to before the receiving terminal in space-time/frequency block code SFBC mode, the relay can estimate first the equivalent channels information of repeated link according to the pilot frequency information after processing, establish

Be the equivalent channels information of estimating:

$y_P=W^T{H}_{r}P+n_P={\tilde{h}}^{r}P+n_P---\left(18\right)$

Can be drawn by formula (7):

${\tilde{h}}^r=W^T{H}_r(r=\mathrm{1,2},...N_R^r)---\left(19\right)$

Again with

Data message behind the preequalization of relay is carried out MRC, so that the gain a in the formula (2) becomes

$a=\underset{r=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}^r\right|}^2=\underset{r=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|W^T{H}_r\right|}^2---\left(20\right)$

H in the formula _rBe the transmission matrix of transmitting terminal to relay reception antenna r.

Wherein, the method can also comprise:

Receiving terminal receives the second data message and the second pilot frequency information, and this second data message is that the data message that the relay sends obtains through transmission, and the second pilot frequency information is that the orthogonal guide frequency information that the relay sends obtains through transmission;

Estimate the channel information of comprehensive link according to the second pilot frequency information, and with the channel information that estimates the second data message of receiving is carried out MRC.

Concrete, the data message that the relay sends and pilot frequency information are through transmission matrix G=[g ₁, g ₂] ^TArrive receiving terminal, behind the arrival receiving terminal, data message and pilot frequency information become respectively the second data message and the second pilot frequency information; After receiving terminal was received the second data message and the second pilot frequency information, according to emitting structural, the pilot frequency information correspondence position of relay, the channel information that estimates respectively 2 * 1 comprehensive links was:

$\left\{\begin{array}{c}{\tilde{h}}_1={\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}\\ {\tilde{h}}_2=g_2\mathrm{\&rho;}\end{array}\right.---\left(21\right)$

Carry out MRC according to the channel estimation results that obtains the second data message after to preequalization again, obtain

y _S＝(|g ₁ρ| ²⁺|g ₂ρ| ²)S+n′ _S (22)

The beneficial effect of the embodiment of the invention is: receive data message and pilot frequency information that transmitting terminal sends with beam forming, according to the pilot frequency information of receiving data message is carried out preequalization, then the data message behind the preequalization is sent with diversity mode, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Data message and pilot frequency information are being processed, made data message obtain identical channel gain with pilot frequency information, thereby can make receiving terminal realize the channel estimating of comprehensive link; The pilot frequency information that relay oneself is produced sends to receiving terminal with orthogonal manner, make receiving terminal can estimate according to the pilot frequency information that relay oneself produces the channel information of access link, because receiving terminal only is subject to the impact of additive noise, the estimation of therefore comprehensive link channel information is more accurate.

Referring to Fig. 5, another embodiment of the present invention provides a kind of pilot frequency transmission method, and the method comprises:

401: the relay receives data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature; This data message is obtained through transmission by transmitting terminal the first data message to be sent, and pilot frequency information is obtained through transmission by first pilot frequency information of transmitting terminal with quadrature to be sent;

Concrete, with the transmitting antenna N of transmitting terminal _TThe SFBC send mode of=2 correspondences is example, and referring to Fig. 7, the first data message of the quadrature that transmitting terminal is to be sent is through 2 * 1 trunk channel transmission matrixs, and the data message that receive the relay is

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; r"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">y</figure-callout>}}_r=h_1{s}_0-h_2{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}+n_{r1}\\ y_{r2}=h_1{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1+h_2{\mathrm{<figure-callout\; id="0"\; label="s"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_0^{*}+n_{r2}\end{array}---\left(23\right)\right.$

Because the first pilot frequency information on each transmitting antenna of transmitting terminal is mutually orthogonal, this first pilot frequency information through 2 * 1 trunk channel transmission matrixs after, the pilot frequency information that receive the relay is

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; p"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">y</figure-callout>}}_p=h_{1}p+n_{p1}\\ y_{p2}=h_{2}p+n_{p2}\end{array}---\left(24\right)\right.$

402: data message and the pilot frequency information received are processed, and the data message after will processing sends to receiving terminal in the SFBC mode, send to receiving terminal behind the pilot frequency information quadrature after will processing.

FFT, string and conversion are carried out first to receiving data message and pilot frequency information in the relay, the Base-Band Processing such as packet, and in order to promote the performance of repeated link, the relay can estimate according to the pilot frequency information after processing the channel information h of repeated link _l(l=1,2) carry out respectively MRC with the channel information that estimates to the data message after processing and the pilot frequency information after the processing, and data message is become

y _s＝{|h ₁| ²+|h ₂| ²)S+N (25)

Pilot frequency information becomes

y _P＝( _|h ¹| ²+|h ₂| ²)P+n _P (26)

Can be found out by formula (16) and formula (17), the gain coefficient a=among Fig. 5 (| h ₁| ²+ | h ₂| ²).

In the present embodiment, can also be through an amplifirer during pilot frequency information after the data message after relay emission is processed and the processing of quadrature, this amplifirer can be adjusted the signal transmission power of relay, if the power amplifier factor of this amplifirer is ρ, when then launch the relay, coefficient before data message and the pilot frequency information becomes b by a, b=a ρ, namely the gain coefficient b=among Fig. 6 ( _| ^h1|2+|h ₂| ²) ρ.

In the present embodiment, the reception antenna when the relay

During increase, the channel information of establishing the repeated link of estimating the relay is

Then have:

y _p＝h _jiP+n _p (27)

H wherein _JiArrive the channel gain of the reception antenna j of relay for the transmitting antenna i of transmitting terminal.

Can be drawn by formula (27)

${\tilde{h}}_{\mathrm{ji}}=\frac{y_p}{P}---\left(28\right)$

Accordingly, with

Data message and pilot frequency information that the relay is received carry out respectively MRC, so that the gain a in the formula (2) becomes

$a=\underset{i=1}{\overset{N_T}{\mathrm{\&Sigma;}}}\underset{j=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|{\tilde{n}}_{\mathrm{ji}}\right|}^2---\left(29\right)$

Wherein, if the relay number of transmit antennas increases, for example when the transmitting antenna of relay is 4, can adopt the send mode of SFBC and FSTD.

Wherein, the method also comprises:

Receiving terminal receives the second data message and the second pilot frequency information, and this second data message is that the data message that the relay sends obtains through transmission, and the second pilot frequency information is that the orthogonal guide frequency information that the relay sends obtains through transmission;

Estimate the channel information of comprehensive link according to the second pilot frequency information, and with the channel information that estimates the second data message of receiving is carried out MRC.

The data message that the relay sends and pilot frequency information are through transmission matrix G=[g ₁, g ₂] ^TArrive receiving terminal, behind the arrival receiving terminal, data message and pilot frequency information become respectively the second data message and the second pilot frequency information; After receiving terminal was received the second data message and the second pilot frequency information, according to emitting structural, the pilot frequency information correspondence position of relay, the channel information that estimates respectively 2 * 1 comprehensive links was:

$\left\{\begin{array}{c}{\tilde{h}}_1={\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}({\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2)\\ {\tilde{h}}_2=g_2\mathrm{\&rho;}({\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2)\end{array}---\left(30\right)\right.$

According to the comprehensive link channel information that estimates the second data message of receiving is carried out MRC, obtain

y _S＝〔|g ₁ρ(|h ₁| ²+|h ₂| ²)| ²+|g ₂ρ(|h ₁| ²+|h ₂| ²)| ²〕S+n′ _S (31)

＝(|h ₁| ²+|h ₂| ²) ²(|g ₁ρ| ²+|g ₂ρ| ²)S+n′ _S

The beneficial effect of the embodiment of the invention is: the relay receives data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature, and carry out MRC and process, then the data message after will processing sends to receiving terminal with diversity mode, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Pilot frequency information after processing is sent to receiving terminal with orthogonal manner, because data message and pilot frequency information are processed, make data message obtain identical channel gain with pilot frequency information, thereby can make receiving terminal realize the channel estimating of comprehensive link; Two-hop link for diversity forward relay system, because the first link information of jumping is implicit being with on the first pilot frequency information of jumping, when transmit the relay, receiving terminal just carried the channel information of two-hop link on this pilot frequency information, so only need utilize pilot frequency information to estimate once just can obtain comprehensive link channel information.

Referring to Fig. 7, another embodiment of the present invention provides a kind of pilot frequency transmission method, and the method comprises:

501: the relay receives data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature;

502: the data message and the pilot frequency information that receive are processed;

503: the described data message after will processing sends to receiving terminal in space-time/frequency block code SFBC mode, sends to receiving terminal behind the pilot frequency information quadrature with relay self generation.

What present embodiment was different from embodiment shown in Figure 6 is, the relay sends to the pilot frequency information P that the pilot frequency information of receiving terminal can be produced by relay oneself ₁Multiply by gain coefficient obtains.For example, the pilot frequency information P of relay oneself generation ₁, with this P ₁Gain coefficient a=in multiply by embodiment shown in Figure 5 ( _|H1| ²+ | h ₂| ²).

Wherein, the described data message after processing is sent to before the receiving terminal in space-time/frequency block code SFBC mode, the method also comprises: according to the pilot frequency information after processing the data message after processing is carried out preequalization.

Concrete, among the embodiment as shown in Figure 5, the data message after processing and pilot frequency information carried out MRC after, data message is y _s=(| h ₁| ²+ | h ₂| ²) during S+N, pilot frequency information is y _P=(| h ₁| ²+ | h ₂| ²) P+n _P,

By the pilot frequency information y after this processing _P=(| h ₁| ²+ | h ₂| ²) P+n _PEstimate gain

To the data message y after this processing _s=(| h ₁| ²+ | h ₂| ²) the S+N preequalization, the data message behind the preequalization is:

$\hat{S}=\frac{{\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2}{{\hat{y}}_p}S+\frac{N}{{\hat{y}}_p}---\left(32\right)$

Referring to Fig. 8, the schematic diagram when for relaying the data message after processing being carried out preequalization, among Fig. 8, the pilot frequency information P that the relay sends is that the relay produces, because data message has been passed through preequalization, the coefficient b before the data message is 1.

Accordingly, among the embodiment as shown in Figure 5, after receiving terminal was received, the channel estimating that obtains according to the second pilot frequency information was

$\left\{\begin{array}{c}{\tilde{h}}_1={\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}\\ {\tilde{h}}_2=g_2\mathrm{\&rho;}\end{array}\right.---\left(33\right)$

Carry out MRC according to the channel estimation results that obtains the second data message after to preequalization again, obtain

y _S＝(|g ₁ρ| ²+|g ₂ρ| ²)S+n′ _S (34)

The beneficial effect of the embodiment of the invention is: the relay receives data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature, and carry out MRC and process, according to the pilot frequency information after processing data message is carried out preequalization, then the data message behind the preequalization is sent to receiving terminal in the SFBC mode, make the relay system transmission obtain maximum diversity gain, improved transmission performance; The pilot frequency information that relay oneself is produced sends to receiving terminal with orthogonal manner, receiving terminal can estimate according to the pilot frequency information that the relay produces the channel information of access link, because receiving terminal only is subject to the impact of additive noise, the channel estimating of therefore comprehensive link is more accurate.

Referring to Fig. 9, one embodiment of the present of invention provide a kind of trunking 600, and this trunking 600 comprises at least: processing module 601 and sending module 602;

Processing module 601 is used for the data message and the pilot frequency information that receive are processed;

Sending module 602 is used for the data message after processing module 601 processing is sent to receiving terminal in space-time/frequency block code SFBC mode, sends to receiving terminal behind the pilot frequency information quadrature after will managing, and makes receiving terminal obtain diversity gain.

Data message is weighted the first data message by transmitting terminal in one embodiment of the present of invention through beamforming vectors, and the process transmission obtains, pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and obtains through transmission;

For example, referring to the double bounce non-regenerative relaying system of Fig. 2, in the present embodiment, trunking 600 also can be called the relay.Transmitting terminal has N _T=4 transmitting antennas, the relay has

Individual reception antenna and

Two transmitting antennas, receiving terminal has N _R=1 reception antenna.The armed data message of transmitting terminal is the first data message, is S=[s ₀, s ₁, s ₂...] ^T, the first pilot frequency information is beam forming dedicated pilot P, transmitting terminal with the first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the data message received of relay is:

y _R＝aS+N (35)

A=W wherein ^TH is scalar, N=[n ₀, n ₁, n ₂...] and be the additive noise vector;

Transmitting terminal with the first pilot frequency information P of beam forming special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[ _h1, h ₂, h ₃, h ₄] ^T, then the pilot frequency information received of relay is:

y _P＝aP+n _P (36)

N wherein _PBe additive noise corresponding to pilot frequency information, and additive noise corresponding to data message has same distribution.

Can be found out that by formula (35) and (36) data message that receive the relay has identical merging gain a with pilot frequency information.

Wherein, pilot frequency information also can be weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, then obtains through transmission.

Referring to Fig. 3, because transmitting terminal is with the first pilot frequency information P ₀After 0 formation orthogonal guide frequency information, be weighted transmitting terminal N through beamforming vectors again _TThe pilot frequency information that sends on each transmitting antenna of individual transmitting antenna is:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l(l=1,...,N_T)---\left(37\right)$

In order to realize that data message and pilot frequency information obtain identical merging gain, the relay is with the N that receives _TIndividual pilot frequency information is through after the base band signal process, and addition obtains pilot frequency information P ':

$P^{\&prime;}=\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l={\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">P</figure-callout>}}_0\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{h}_l+\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{n}_l=\mathrm{\&alpha;}{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">P</figure-callout>}}_0+n^{\&prime;\&prime;}---\left(38\right)$

Wherein Obviously, the noise variance of pilot frequency information P ' is the N of noise variance corresponding to data message _TDoubly, therefore, for fear of the decline of channel estimating performance, can be the N of traditional design with the pilot frequency information energy lift in the present embodiment _TDoubly, i.e. P _P0=N _TP _P

601 pairs of these data messages of processing module and pilot frequency information carry out FFT, string and conversion, the Base-Band Processing such as packet;

Data message y after sending module 602 is processed processing module 601 _RSend with two transmitting antennas of SFBC mode from the relay, will send behind the pilot frequency information quadrature.In the present embodiment, can also be through an amplifirer when relay sends data message and pilot frequency information, this amplifirer can be adjusted the signal transmission power of relay, and the power amplifier factor of establishing this amplifirer is ρ;

Referring to Fig. 2, the data message that sends respectively on two transmitting antennas of relay is:

The orthogonal guide frequency information that sends respectively on two transmitting antennas of relay is:

Parameter b among Fig. 2 is not for considering the equivalent coefficient under the noise situations, as can be seen from Figure 2, coefficient before the data message that has just received the relay and the pilot frequency information is a, when sending module 602 sends because through amplifirer, variation has occured in the coefficient before data message and the pilot frequency information, be that coefficient becomes b by a, b=a ρ, wherein a and ρ are respectively plural number and real number.

Wherein, in relay system, the reception antenna when the relay

The time, referring to Fig. 9, this trunking 600 can also comprise: estimation module 603 and MRC module 604;

Estimation module 603 for the equivalent channels information that estimates repeated link according to the pilot frequency information after processing module 601 processing, is established

Be the equivalent channels information of estimating:

$y_P=W^T{H}_{r}P+n_P={\tilde{h}}^{r}P+n_P---\left(41\right)$

Can be drawn by formula (41)

${\tilde{h}}^r=W^T{H}_r(r=\mathrm{1,2},...N_R^r)---\left(42\right)$

MRC module 604 is used for estimating according to estimation module 603

Data message and pilot frequency information after the processing of relay are carried out respectively MRC, so that the gain a in the formula (36) becomes

$a=\underset{r=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}^r\right|}^2=\underset{r=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|W^T{H}_r\right|}^2---\left(43\right)$

H in the formula _rBe the transmission matrix of transmitting terminal to relay reception antenna r.

Wherein, this trunking 600 can also comprise: receiver module 605 is used for this receiver module 605 and is used for receiving data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature; This data message is obtained through transmission by transmitting terminal the first data message to be sent, and pilot frequency information is obtained through transmission by first pilot frequency information of transmitting terminal with quadrature to be sent;

Concrete, with the transmitting antenna N of transmitting terminal _TThe SFBC send mode of=2 correspondences is example, and referring to Fig. 6, the first data message of the quadrature that transmitting terminal is to be sent is through 2 * 1 trunk channel transmission matrixs, and the data message that receive the relay is

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; r"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">y</figure-callout>}}_r=h_1{s}_0-h_2{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}+n_{r1}\\ y_{r2}=h_1{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1+h_2{\mathrm{<figure-callout\; id="0"\; label="s"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">s</figure-callout>}}_0^{*}+n_{r2}\end{array}---\left(44\right)\right.$

Because the first pilot frequency information on each transmitting antenna of transmitting terminal is mutually orthogonal, this first pilot frequency information through 2 * 1 trunk channel transmission matrixs after, the pilot frequency information that receive the relay is

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; p"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">y</figure-callout>}}_p=h_{1}p+n_{p1}\\ y_{p2}=h_{2}p+n_{p2}\end{array}---\left(45\right)\right.$

Accordingly, after 604 pairs of data messages of MRC module and pilot frequency information carried out MRC respectively, data message became y _s=(| h ₁| ²+ | h ₂| ²) S+N (46)

Pilot frequency information becomes

y _P＝(|h ₁| ²+|h ₂| ²)P+n _P (47)

Can be found out by formula (46) and formula (47), the gain coefficient a=among Fig. 5 (| h ₁| ²+ | h ₂| ²).

Can also be through an amplifirer during pilot frequency information after the data message in the present embodiment after sending module 602 transmission processings and the processing of quadrature, this amplifirer can be adjusted the signal transmission power of relay, if the factor of this amplifirer is ρ, when then sending module 602 sends, coefficient before data message and the pilot frequency information becomes b by a, b=a ρ, namely the gain coefficient b=among Fig. 5 (| h ₁| ²+ | h2 _| ²) ρ.

In this relay system, the reception antenna when the relay

During increase, the channel information of establishing estimation module 603 estimations is

Y is arranged _p=h _JiP+n _p(48)

H wherein _JiArrive the channel gain of the reception antenna j of relay for the transmitting antenna i of transmitting terminal.

Can be drawn by formula (48)

${\tilde{h}}_{\mathrm{ji}}=\frac{y_p}{P}---\left(49\right)$

Accordingly, MRC module 604 with

Data message and pilot frequency information that the relay is received carry out respectively MRC, so that the gain a in the formula (36) becomes

$a=\underset{i=1}{\overset{N_T}{\mathrm{\&Sigma;}}}\underset{j=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|{\tilde{n}}_{\mathrm{ji}}\right|}^2---\left(50\right)$

The beneficial effect of the embodiment of the invention is: the relay receives data message and the pilot frequency information that transmitting terminal sends with beam forming, the relay also can receive data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature, and carry out MRC and process, then adopt diversity mode forwarding data information, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Data message and pilot frequency information are processed, made data message obtain identical channel gain with pilot frequency information, thereby can make receiving terminal realize the channel estimating of comprehensive link; For the beam forming scheme, the first pilot frequency information can be selected the beam forming dedicated pilot, also can select orthogonal guide frequency, has increased the mode of the pilot frequency information that sends; Two-hop link for diversity forward relay system, because the first link information of jumping is implicit being with on the first pilot frequency information of jumping, when transmit the relay, receiving terminal just carried the channel information of two-hop link on this pilot frequency information, so only need utilize pilot frequency information to estimate once just can obtain comprehensive link channel information.

Referring to Figure 10, one embodiment of the present of invention provide a kind of trunking 700, and this trunking 700 comprises at least: processing module 701, generation module 702 and sending module 703;

Processing module 701 is used for the data message that receives is processed;

Generation module 702 is for generation of pilot frequency information;

Concrete, the generation module 606 of trunking 700 produces pilot frequency information P ₁, with this P ₁Multiply by a gain coefficient, such as, can multiply by gain coefficient a=in the formula (46) (| h ₁| ²+ | h ₂| ²).

Sending module 703 be used for the data message after processing module 701 processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that generation module 702 is produced sends to receiving terminal with orthogonal manner.

For example, referring to the double bounce non-regenerative relaying system of Fig. 2, in the present embodiment, trunking 700 also can be called the relay.Transmitting terminal has N _T=4 transmitting antennas, the relay has

Individual reception antenna and

Two transmitting antennas, receiving terminal has N _R=1 reception antenna.The armed data message of transmitting terminal is the first data message, is S=[s ₀, s ₁, s ₂...] ^T, the first pilot frequency information is beam forming dedicated pilot P, transmitting terminal with the first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the data message received of relay is:

y _R＝aS+N (51)

A=W wherein ^TH is scalar, N=[n ₀, n ₁, n ₂...] and be the additive noise vector;

Transmitting terminal with the first pilot frequency information P of beam forming special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TThe emission of the backward relay of weighting, in the emission process through 4 * 1 transmission matrix H=[h ₁, h ₂, h ₃, h ₄] ^T, then the pilot frequency information received of relay is:

y _P＝aP+ _nP (52)

N wherein _PBe additive noise corresponding to pilot frequency information, and additive noise corresponding to data message has same distribution.

Can be found out that by formula (51) and (52) data message that receive the relay has identical merging gain a with pilot frequency information.

Wherein, pilot frequency information also can be weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, then obtains through transmission.

Referring to Fig. 3, because transmitting terminal is with the first pilot frequency information P ₀After 0 formation orthogonal guide frequency information, be weighted transmitting terminal N through beamforming vectors again _TThe pilot frequency information that sends on each transmitting antenna of individual transmitting antenna is:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E00012.png,H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l(l=1,...,N_T)---\left(53\right)$

In order to realize that data message and pilot frequency information obtain identical merging gain, the relay is with the N that receives _TIndividual pilot frequency information is through after the base band signal process, and addition obtains pilot frequency information P ':

This for fear of the decline of channel estimating performance, can be the N of traditional design with the pilot frequency information energy lift in the present embodiment _TDoubly, i.e. P _P0=N _TP _P

Wherein, referring to Figure 10, this trunking 700 also comprises: preequalization module 704;

Preequalization module 704 is used for according to the pilot frequency information after processing module 701 processing data message after processing being carried out preequalization.

1) concrete, as data message y _RDuring=aS+N,

By the pilot frequency information y after processing _P=aP+n _PEstimate to draw gain a,

Again to the y after processing _R=aS+N preequalization, the data message behind the preequalization becomes:

2〉by the pilot frequency information P ' after processing=α P ₀+ n " estimates to draw gain

Again to the data message y after processing _R=aS+N preequalization, the data message behind the preequalization becomes

Accordingly, sending module 703 is used for the data message y behind preequalization module 704 preequalizations _RSend to receiving terminal in the SFBC mode, and the pilot frequency information that generation module 702 is produced sends to receiving terminal with orthogonal manner.

Referring to Figure 10, trunking 700 can also comprise receiver module 705, and this receiver module 705 is used for receiving data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature; This data message is obtained through transmission by transmitting terminal the first data message to be sent, and pilot frequency information is obtained through transmission by first pilot frequency information of transmitting terminal with quadrature to be sent.

In relay system, the reception antenna when the relay

The time, this trunking 700 can also comprise: estimation module 706 and MRC module 707;

Estimation module 706 is for the equivalent channels information that estimates repeated link according to the pilot frequency information after processing module 701 processing

Y is arranged _p=h _JiP+n _p(55)

H wherein _JiArrive the channel gain of the reception antenna j of relay for the transmitting antenna i of transmitting terminal.

Can be drawn by formula (55)

${\tilde{h}}_{\mathrm{ji}}=\frac{y_p}{P}---\left(56\right)$

MRC module 707 is used for estimating according to estimation module 706

Data message and pilot frequency information after the processing of relay are carried out respectively MRC, so that the gain a in the formula (52) becomes

$a=\underset{i=1}{\overset{N_T}{\mathrm{\&Sigma;}}}\underset{j=1}{\overset{N_R^r}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_{\mathrm{ji}}\right|}^2---\left(57\right)$

Referring to Figure 11, comprise at trunking 700 in the situation of receiver module 705, the structural representation of trunking 700, preequalization module 704 according to the pilot frequency information after processing to the concrete condition that the data message after processing carries out preequalization is:

After data message after 706 pairs of processing of MRC module and pilot frequency information carried out MRC, data message was y _s=(| h ₁| ²+ | h ₂| ²) S+N, pilot frequency information is y _P=(| h ₁| ²+ | h ₂| ²) P+n _P,

By the pilot frequency information y behind this process MRC _P=(| h ₁| ²+ | h ₂| ²) P+n _PEstimate gain

To the data message y behind this process MRC _s=(| h ₁| ²+ | h ₂| ²) S+N carries out preequalization, the data message behind the preequalization is:

$\hat{S}=\frac{{\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E00013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2}{{\hat{y}}_p}S+\frac{N}{{\hat{y}}_p}---\left(58\right)$

Referring to Fig. 8, the schematic diagram when for relaying the data message after processing being carried out preequalization, among Fig. 8, the pilot frequency information P that the relay sends is that the relay produces, because data message has been passed through preequalization, the coefficient b before the data message is 1.

The beneficial effect of the embodiment of the invention is: receive data message and pilot frequency information that transmitting terminal sends with beam forming, data message is processed, then the data message after will processing is transmitted to receiving terminal with diversity mode, the pilot frequency information that the relay is produced sends to receiving terminal with orthogonal manner, make the relay system transmission obtain maximum diversity gain, improved transmission performance; And because make the pilot frequency information that relay self produces and process after the identical channel gain of data message acquisition, thereby can make receiving terminal realize the channel estimating of comprehensive link; Because the data message of transmitting comprises the gain coefficient of repeated link, can before forwarding data information, carry out preequalization to data message, then the data message behind the preequalization is sent to receiving terminal in the SFBC mode, the pilot frequency information that relay self is produced sends to receiving terminal with orthogonal manner, make receiving terminal can estimate according to the pilot frequency information that the relay produces the channel information of access link, because receiving terminal only is subject to the impact of additive noise, the estimation of the channel information of therefore comprehensive link is more accurate.Two-hop link for diversity forward relay system, since the first link information of jumping implicit band on the first pilot frequency information of jumping, when transmit the relay, receiving terminal just carried the channel information of two-hop link on this pilot frequency information, so only need utilize pilot frequency information to estimate once just can obtain comprehensive link channel information.

The embodiment of the invention can utilize software to realize, corresponding software program can be stored in the storage medium that can read, for example, and in the hard disk of computer, buffer memory or the CD.

The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1. a pilot frequency transmission method is characterized in that, described method comprises:

Process the data message and the pilot frequency information that receive the relay;

Data message after processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information after will processing sends to receiving terminal with orthogonal manner;

Data message after described will the processing sends to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information after will processing sends to receiving terminal with orthogonal manner, specifically comprises:

The relay sends data message in the SFBC mode respectively on two transmitting antennas, and the data message that sends respectively on described two transmitting antennas is:

The relay sends respectively orthogonal guide frequency information on two transmitting antennas, and the orthogonal guide frequency information that sends respectively on described two transmitting antennas is:

Wherein, ρ is the power amplifier factor of amplifirer, and a is the merging gain of the data message that receives of relay and pilot frequency information, s ₁And s ₂Be the data message that transmitting terminal sends, n ₁And n ₂Be additive noise corresponding to data message, P is the pilot frequency information that transmitting terminal sends, and n is additive noise corresponding to pilot frequency information.

2. method according to claim 1 is characterized in that, described data message is weighted the first data message by transmitting terminal through beamforming vectors, and the process transmission is to the relay;

Described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and the process transmission is to the relay; Perhaps, described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and the process transmission is to the relay.

3. method according to claim 1 is characterized in that, before processed the data message that receives and pilot frequency information the relay, described method comprised:

The relay receives data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature.

4. method according to claim 3 is characterized in that, the described data message after processing is sent to before the receiving terminal in space-time/frequency block code SFBC mode, and described method also comprises:

The repeated link equivalent channels information is estimated according to the described pilot frequency information after processing in the relay, and with described repeated link equivalent channels information to the described data message after processing and the described pilot frequency information after processing carry out respectively high specific merging MRC.

5. a pilot frequency transmission method is characterized in that, described method comprises:

Process the data message that receives the relay;

Data message after processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that the relay is produced sends to receiving terminal with orthogonal manner;

Wherein, the data message after processing is sent to before the receiving terminal in space-time/frequency block code SFBC mode, described method also comprises:

The pilot frequency information of receiving is processed;

According to the pilot frequency information after processing the data message after processing is carried out preequalization;

Data message after described will the processing sends to receiving terminal in space-time/frequency block code SFBC mode, comprising:

Data message behind the preequalization is sent to receiving terminal in space-time/frequency block code SFBC mode.

6. method according to claim 5 is characterized in that, described data message is weighted the first data message by transmitting terminal through beamforming vectors, and the process transmission is to the relay;

Described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and the process transmission is to the relay; Perhaps, described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and the process transmission is to the relay.

7. method according to claim 5 is characterized in that, before processed the data message that receives and pilot frequency information the relay, described method also comprised:

The relay receives data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature.

8. method according to claim 7 is characterized in that, according to the pilot frequency information after processing the data message after processing is carried out before the preequalization, and described method also comprises:

The repeated link equivalent channels information is estimated according to the described pilot frequency information after processing in the relay, and with described repeated link equivalent channels information to the described data message after processing and the described pilot frequency information after processing carry out respectively high specific merging MRC.

9. a trunking is characterized in that, described trunking comprises:

Processing module is used for the data message and the pilot frequency information that receive are processed;

Sending module be used for the described data message after the described processing module processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the described pilot frequency information after will processing sends to receiving terminal with orthogonal manner;

Wherein, described sending module be used for sending data message in the SFBC mode respectively on two transmitting antennas, and the data message that sends respectively on described two transmitting antennas is:

Described sending module be used for sending respectively orthogonal guide frequency information on two transmitting antennas, and the orthogonal guide frequency information that sends respectively on described two transmitting antennas is:

Wherein, ρ is the power amplifier factor of amplifirer, and a is the merging gain of the data message that receives of relay and pilot frequency information, s ₁And s ₂Be the data message that transmitting terminal sends, n ₁And n ₂Be additive noise corresponding to data message, P is the pilot frequency information that transmitting terminal sends, and n is additive noise corresponding to pilot frequency information.

10. trunking according to claim 9 is characterized in that, described data message is weighted the first data message by transmitting terminal through beamforming vectors, and the process transmission is to the relay;

Described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and the process transmission is to the relay; Perhaps, described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and the process transmission is to the relay.

11. trunking according to claim 9 is characterized in that, described trunking also comprises:

Receiver module be used for to receive data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature.

12. trunking according to claim 11 is characterized in that, described trunking also comprises:

Estimation module is used for the equivalent channels information according to the estimation of the pilot frequency information after described processing repeated link;

High specific merges the MRC module, and the described repeated link equivalent channels information that is used for estimating according to described estimation module is carried out respectively MRC to the described data message after processing and the described pilot frequency information after the processing.

13. a trunking is characterized in that, described trunking comprises:

Processing module is used for the data message that receives is processed;

Generation module is for generation of pilot frequency information;

Sending module be used for the data message after the described processing module processing is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that described generation module is produced sends to receiving terminal with orthogonal manner;

Wherein, described processing module also is used for the pilot frequency information of receiving is processed, and described trunking also comprises:

The preequalization module is used for according to the pilot frequency information after the described processing module processing data message after processing being carried out preequalization;

Described sending module be used for the data message behind the described preequalization module preequalization is sent to receiving terminal in space-time/frequency block code SFBC mode, and the pilot frequency information that described generation module is produced sends to receiving terminal with orthogonal manner.

14. trunking according to claim 13 is characterized in that, the data message that described processing module is processed is weighted the first data message by transmitting terminal through beamforming vectors, and the process transmission is to the relay;

The pilot frequency information that described processing module is processed is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam forming special use, and the process transmission is to the relay; Perhaps, the pilot frequency information that described processing module is processed is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and the process transmission is to the relay.

15. trunking according to claim 13 is characterized in that, described trunking also comprises:

Receiver module be used for to receive data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature.

16. trunking according to claim 15 is characterized in that, described trunking also comprises:

Estimation module is used for the equivalent channels information according to the described pilot frequency information estimation repeated link after processing;

High specific merges the MRC module, be used for the described repeated link equivalent channels information that estimates according to described estimation module after to described processing described data message and process after described pilot frequency information carry out respectively MRC;

Accordingly, described preequalization module is used for according to the pilot frequency information behind the described process MRC carrying out preequalization through the data message behind the MRC.

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