CN101958769A - 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 be supported the communication of blind spot area or hot zones with the layout designs of least cost, better covering or system throughput are provided, therefore introduced relaying technique, relaying technique sends after being to use the relay that the signal of transmitting terminal is handled 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 decoding, encode in the relay to signal again.

At present in the regenerative repeating pilot transmission technology, transmitting terminal and relay can send independently pilot frequency information respectively, 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 research focus.Yet in the non-regenerative relaying technology, the scheme of the pilot frequency information of transmitting terminal is directly transmitted in the relay, only be applicable to amplify the non-regenerative relaying system that transmits, and the transmission performance of the non-regenerative relaying system that amplification is transmitted is lower; If data message and pilot frequency information are handled to improve transmission performance, because before and after handling, variation has taken place in data message and pilot frequency information, directly transmits data and pilot frequency information after handling again, then can not realize 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:

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

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

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

Handle the data message that receives the relay;

Data message after handling 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.

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 handled;

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 handling sends to receiving terminal with orthogonal manner.

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 handled;

Generation module is used to produce 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.

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 handling 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 handled, are made data message obtain identical channel gain, thereby can make receiving terminal realize the channel estimating of comprehensive link with pilot frequency information.

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 a 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 constitutes 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 a 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 this method comprises:

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

102: the data message after will handling is a 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: the relay adopts diversity mode to transmit data message, makes the relay system transmission obtain diversity gain; Data message and pilot frequency information are handled, made data message obtain identical channel gain, thereby can make receiving terminal realize the channel estimating of comprehensive link with pilot frequency information.

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

201: handle the data message and the pilot frequency information that receive the relay, this data message is weighted first data message by transmitting terminal through beamforming vectors, and the process Channel Transmission is given the relay, this pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and gives the relay through Channel Transmission.

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 first data message, is S=[s ₀, s ₁, s ₂...] ^T, first pilot frequency information is beam shaping dedicated pilot P, transmitting terminal with first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 a 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 shaping special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 _PFor the additive noise of pilot frequency information correspondence and the additive noise of data message correspondence have same distribution.

By formula (1) and (2) as can be seen, the 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, obtains through Channel Transmission then.

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:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l,(l=1,...,N_T)---\left(3\right)$

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 ':

$P^{\&prime;}=\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l={\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">P</figure-callout>}}_0\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{h}_l+\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{n}_l=\mathrm{\&alpha;}{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">P</figure-callout>}}_0+n^{\&prime;\&prime;}---\left(4\right)$

Wherein

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

FFT (Fast Fourier Transform, fast fourier transform), string and conversion, 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 handled sends to receiving terminal in the SFBC mode, will send to receiving terminal behind the pilot frequency information quadrature after handling.

Data message y after the relay will be handled _RSend with two transmitting antennas of SFBC mode, with the pilot frequency information y after handling from the relay _PSend behind the quadrature.In the present embodiment, can also be when the relay sends data message and pilot frequency information through an amplifirer, 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 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 take place variation, promptly 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 handling is sent to before the receiving terminal in space-time/frequency block code SFBC mode, the relay can estimate the equivalent channels information of repeated link earlier according to the pilot frequency information after handling, 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 draw 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 MRC (Maximum RatioCombining, high specific merges) respectively, make 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 Channel Transmission matrix of transmitting terminal to relaying reception antenna r.

Wherein, this method can also comprise:

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

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

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

$\left\{\begin{array}{c}{\tilde{h}}_1=a{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}+{\tilde{n}}_1\\ {\tilde{h}}_2=a^{*}{g}_2\mathrm{\&rho;}+{\tilde{n}}_2\end{array}\right.---\left(10\right)$

Again with

With

Second data message that receives is carried out MRC, obtains:

$\left\{\begin{array}{c}{y}_s^1=({\left|a{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}\right|}^2+{\left|a^{*}{g}_2\mathrm{\&rho;}\right|}^2){\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1+{\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">n</figure-callout>}}_1^{\&prime;}\\ y_s^2=({\left|a{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}\right|}^2+{\left|a^{*}{g}_2\mathrm{\&rho;}\right|}^2)s_2+n_2^{\&prime;}\end{array}\right.---\left(11\right)$

The beneficial effect of the embodiment of the invention is: receive data message and pilot frequency information that transmitting terminal sends with beam shaping, adopt diversity mode to transmit data message, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Data message and pilot frequency information are handled, made data message obtain identical channel gain, thereby can make receiving terminal realize the channel estimating of comprehensive link with pilot frequency information; Two-hop link for diversity forward relay system, because first link information of jumping implicit band is on 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 shaping scheme, first pilot frequency information can be selected the beam shaping 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 this method comprises:

301: handle the data message and the pilot frequency information that receive the relay; This data message is weighted first data message by transmitting terminal through beamforming vectors, and the process Channel Transmission is given the relay, this pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and gives the relay through Channel Transmission.

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 first data message, is S=[s ₀, s ₁, s ₂...] ^T, first pilot frequency information is beam shaping dedicated pilot P, transmitting terminal with first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 a 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 shaping special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 _PFor the additive noise of pilot frequency information correspondence and the additive noise of data message correspondence have same distribution.

By formula (12) and (13) as can be seen, the 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, obtains through Channel Transmission then.

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:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l,(l=1,...,N_T)---\left(14\right)$

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 ':

$P^{\&prime;}=\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l={\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">P</figure-callout>}}_0\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{h}_l+\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{n}_l=\mathrm{\&alpha;}{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">P</figure-callout>}}_0+n^{\&prime;\&prime;}---\left(15\right)$

Wherein

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

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

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

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

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

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

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

Again to the data message y after handling _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, send behind the pilot frequency information quadrature that the relay produces self from the relay.In the present embodiment, can also be during the pilot frequency information of the data message behind the relay transmission preequalization and relay oneself generation of quadrature through an amplifirer, 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 under the situation of preequalization, then the data message that 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 the equivalent channels information of repeated link earlier according to the pilot frequency information after handling, 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 draw 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, make 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 Channel Transmission matrix of transmitting terminal to relaying reception antenna r.

Wherein, this method can also comprise:

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

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

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

$\left\{\begin{array}{c}{\tilde{h}}_1={\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}\\ {\tilde{h}}_2=g_2\mathrm{\&rho;}\end{array}\right.---\left(21\right)$

Carry out MRC according to the channel estimation results that obtains 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 shaping, 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 handled, made data message obtain identical channel gain, thereby can make receiving terminal realize the channel estimating of comprehensive link with pilot frequency information; The pilot frequency information that relay oneself is produced sends to receiving terminal with orthogonal manner, make receiving terminal can estimate the channel information of access link according to the pilot frequency information that relay oneself produces, because receiving terminal only is subjected to the influence 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 this method comprises:

401: the relay receives the data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature; This data message is obtained through Channel Transmission by transmitting terminal first data message to be sent, and pilot frequency information is obtained through Channel 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 an example, and referring to Fig. 7, 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

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; r"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">y</figure-callout>}}_r=h_1{s}_0-h_2{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}+n_{r1}\\ y_{r2}=h_1{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1+h_2{\mathrm{<figure-callout\; id="0"\; label="s"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">s</figure-callout>}}_0^{*}+n_{r2}\end{array}\right.---\left(23\right)$

Because 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

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; p"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">y</figure-callout>}}_p=h_{1}p+n_{p1}\\ y_{p2}=h_{2}p+n_{p2}\end{array}\right.---\left(24\right)$

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

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

By formula (16) and formula (17) as can be seen, the gain coefficient a=among Fig. 5 (| h ₁| ²+ | h ₂| ²).

In the present embodiment, can also be during pilot frequency information after the data message after relay emission is handled and the processing of quadrature through an amplifirer, 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, promptly the gain coefficient b=among Fig. 6 (| h ₁| 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 draw 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 MRC respectively, make that the gain a in the formula (2) becomes

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

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, this method also comprises:

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

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

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

$\left\{\begin{array}{c}{\tilde{h}}_1={\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}({\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2)\\ {\tilde{h}}_2=g_2\mathrm{\&rho;}({\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2)\end{array}\right.---\left(30\right)$

According to the comprehensive link channel information that estimates 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 the data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature, and carry out MRC and handle, data message after will handling then sends to receiving terminal with diversity mode, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Pilot frequency information after handling is sent to receiving terminal with orthogonal manner,, make data message obtain identical channel gain, thereby can make receiving terminal realize the channel estimating of comprehensive link with pilot frequency information because data message and pilot frequency information are handled; Two-hop link for diversity forward relay system, because the implicit band of first link information of jumping is on 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 this method comprises:

501: the relay receives the 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 handled;

503: the described data message after will handling 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 with 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 (| h ₁| ²+ | h ₂| ²).

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

Concrete, among the embodiment as shown in Figure 5, the data message after handling 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:

$\hat{S}=\frac{{\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2}{{\hat{y}}_p}S+\frac{N}{{\hat{y}}_p}---\left(32\right)$

Referring to Fig. 8, the schematic diagram when the data message after handling being carried out preequalization for relaying, 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 second pilot frequency information was

$\left\{\begin{array}{c}{\tilde{h}}_1={\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">g</figure-callout>}}_1\mathrm{\&rho;}\\ {\tilde{h}}_2=g_2\mathrm{\&rho;}\end{array}\right.---\left(33\right)$

Carry out MRC according to the channel estimation results that obtains 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 the data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature, and carry out MRC and handle, according to the pilot frequency information after handling 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 the channel information of access link according to the pilot frequency information that the relay produces, because receiving terminal only is subjected to the influence 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 handled;

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 first data message by transmitting terminal in one embodiment of the present of invention through beamforming vectors, and the process Channel Transmission obtains, pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and obtains through Channel 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 first data message, is S=[s ₀, s ₁, s ₂...] ^T, first pilot frequency information is beam shaping dedicated pilot P, transmitting terminal with first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 a 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 shaping special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 (36)

N wherein _PFor the additive noise of pilot frequency information correspondence and the additive noise of data message correspondence have same distribution.

By formula (35) and (36) as can be seen, the 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, obtains through Channel Transmission then.

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:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l,(l=1,...,N_T)---\left(37\right)$

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 ':

$P^{\&prime;}=\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l={\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">P</figure-callout>}}_0\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{w}_l{h}_l+\underset{l=1}{\overset{N_T}{\mathrm{\&Sigma;}}}{n}_l=\mathrm{\&alpha;}{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">P</figure-callout>}}_0+n^{\&prime;\&prime;}---\left(38\right)$

Wherein

Obviously, the noise variance of pilot frequency information P ' is the N of the noise variance of data message correspondence _TDoubly, therefore,, can with the pilot frequency information energy lift in the present embodiment N of traditional design for fear of the decline of channel estimating performance _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, Base-Band Processing such as packet;

Data message y after sending module 602 is handled processing module 601 _RSend with two transmitting antennas of SFBC mode, will send behind the pilot frequency information quadrature from the relay.In the present embodiment, can also be when the relay sends data message and pilot frequency information through an amplifirer, 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 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 taken place 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, the pilot frequency information after being used for handling according to processing module 601 estimates the equivalent channels information of repeated link, establishes

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 draw 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 MRC respectively, make 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 Channel Transmission matrix of transmitting terminal to relaying reception antenna r.

Wherein, this trunking 600 can also comprise: receiver module 605 is used for this receiver module 605 and is used to receive the data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature; This data message is obtained through Channel Transmission by transmitting terminal first data message to be sent, and pilot frequency information is obtained through Channel 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 an example, and referring to Fig. 6, 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

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; r"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">y</figure-callout>}}_r=h_1{s}_0-h_2{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}+n_{r1}\\ y_{r2}=h_1{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">s</figure-callout>}}_1+h_2{\mathrm{<figure-callout\; id="0"\; label="s"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">s</figure-callout>}}_0^{*}+n_{r2}\end{array}\right.---\left(44\right)$

Because 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

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="y\; p"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">y</figure-callout>}}_p=h_{1}p+n_{p1}\\ y_{p2}=h_{2}p+n_{p2}\end{array}\right.---\left(45\right)$

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)

By formula (46) and formula (47) as can be seen, the gain coefficient a=among Fig. 5 (| h ₁| ²+ | h ₂| ²).

Can also be when sending module 602 sends pilot frequency information after the processing of data message after handling and quadrature in the present embodiment through an amplifirer, 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, promptly the gain coefficient b=among Fig. 5 (| h ₁| ²+ | h ₂| ²) ρ.

In this relay system, the reception antenna when the relay

During increase, establish estimation module 603 estimated channel information and be

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 draw 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 MRC respectively, make that the gain a in the formula (36) becomes

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

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 shaping, the relay also can receive the data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature, and carry out MRC and handle, adopt diversity mode to transmit data message then, make the relay system transmission obtain maximum diversity gain, improved transmission performance; Data message and pilot frequency information are handled, made data message obtain identical channel gain, thereby can make receiving terminal realize the channel estimating of comprehensive link with pilot frequency information; For the beam shaping scheme, first pilot frequency information can be selected the beam shaping 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 implicit band of first link information of jumping is on 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 handled;

Generation module 702 is used to produce 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 first data message, is S=[s ₀, s ₁, s ₂...] ^T, first pilot frequency information is beam shaping dedicated pilot P, transmitting terminal with first data message through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 a 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 shaping special use through beamforming vectors W=[w ₁, w ₂, w ₃, w ₄] ^TAfter the weighting to relay emission, in the emission process through 4 * 1 Channel 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 (52)

N wherein _PFor the additive noise of pilot frequency information correspondence and the additive noise of data message correspondence have same distribution.

By formula (51) and (52) as can be seen, the 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, obtains through Channel Transmission then.

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:

$y_P^l=w_l{\mathrm{<figure-callout\; id="0"\; label="h\; l\; P"\; filenames="H2009100889448E0000013.png,H2009100889448E0000023.png"\; state="\{\{state\}\}">h</figure-callout>}}_l{P}_{}{}_0+n_l,(l=1,...,N_T)---\left(53\right)$

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 handling being carried out preequalization.

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

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

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

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

Again to the data message y after handling _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 to receive the data message that transmitting terminal sends in the SFBC mode and the pilot frequency information of quadrature; This data message is obtained through Channel Transmission by transmitting terminal first data message to be sent, and pilot frequency information is obtained through Channel 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, the pilot frequency information after being used for handling according to processing module 701 estimates the equivalent channels information of repeated link

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 draw 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 MRC respectively, make 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 under the situation of receiver module 705, the structural representation of trunking 700, preequalization module 704 according to the pilot frequency information after handling to the concrete condition that the data message after handling 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:

$\hat{S}=\frac{{\left|{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="H2009100889448E0000012.png,H2009100889448E0000013.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\right|}^2+{\left|h_2\right|}^2}{{\hat{y}}_p}S+\frac{N}{{\hat{y}}_p}---\left(58\right)$

Referring to Fig. 8, the schematic diagram when the data message after handling being carried out preequalization for relaying, 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 shaping, data message is handled, data message after will handling then 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 handle 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 transmitting data message, 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 the channel information of access link according to the pilot frequency information that the relay produces, because receiving terminal only is subjected to the influence of additive noise, the estimation of the channel information of therefore comprehensive link is more accurate.Two-hop link for diversity forward relay system, because first link information of jumping implicit band is on 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 that corresponding software programs 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 restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (18)

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

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

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

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

Described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and gives the relay through Channel Transmission; Perhaps, described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and gives the relay through Channel Transmission.

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

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

4. according to claim 2 or 3 described methods, it is characterized in that the described data message after handling 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 handling in the relay, and with described repeated link equivalent channels information to the described data message after handling and the described pilot frequency information after handling carry out high specific merging MRC respectively.

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

Handle the data message that receives the relay;

Data message after handling 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.

6. method according to claim 5 is characterized in that, the data message after handling is sent to before the receiving terminal in space-time/frequency block code SFBC mode, and described method also comprises:

The pilot frequency information of receiving is handled;

According to the pilot frequency information after handling the data message after handling 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.

7. method according to claim 6 is characterized in that, described data message is weighted first data message by transmitting terminal through beamforming vectors, and gives the relay through Channel Transmission;

Described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and gives the relay through Channel Transmission; Perhaps, described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and gives the relay through Channel Transmission.

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

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

9. according to claim 7 or 8 described methods, it is characterized in that according to the pilot frequency information after handling the data message after handling is carried out before the preequalization, described method also comprises:

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

10. 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 handled;

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 handling sends to receiving terminal with orthogonal manner.

11. trunking according to claim 10 is characterized in that, described data message is weighted first data message by transmitting terminal through beamforming vectors, and gives the relay through Channel Transmission;

Described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and gives the relay through Channel Transmission; Perhaps, described pilot frequency information is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and gives the relay through Channel Transmission.

12. trunking according to claim 10 is characterized in that, described trunking also comprises:

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

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

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 MRC respectively to described data message after handling and the described pilot frequency information after the processing.

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

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

Generation module is used to produce 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.

15. trunking according to claim 14 is characterized in that, described processing module also is used for the pilot frequency information of receiving is handled, 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 handling being carried out preequalization;

Described sending module is 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.

16. trunking according to claim 15 is characterized in that, the data message that described processing module is handled is weighted first data message by transmitting terminal through beamforming vectors, and gives the relay through Channel Transmission;

The pilot frequency information that described processing module is handled is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with the beam shaping special use, and gives the relay through Channel Transmission; Perhaps, the pilot frequency information that described processing module is handled is weighted through beamforming vectors by first pilot frequency information of transmitting terminal with quadrature, and gives the relay through Channel Transmission.

17. trunking according to claim 14 is characterized in that, described trunking also comprises:

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

18., it is characterized in that described trunking also comprises according to claim 15 or 17 described trunkings:

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

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 handle after described pilot frequency information carry out MRC respectively;

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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