CN101043244A - Transmission diversity method in single carrier block transmission of multi-antenna communication system - Google Patents

Abstract

Based on the invention, a transmission diversity method in single carrier wave block transmission of multi antenna communication system is disclosed, it includes: at the sending end, aiming at one path of emission antenna, the original block signal is inserted with protecting interval and sent via said one path of emission antenna, aiming at the other path of emission antenna, firstly the original block signal is parallel processed, summing the signal which is parallel processed and inserting protecting interval, and sending via said other emission antenna, said two parallel processes are constructed with conjugating replacement process and character sequence weighting process; at the receiving end, four frequency signals which is sent by said one path of emission antenna and the other emission antenna in adjacent two sub carrier waves are linear poised in traditional Alamouti mode.

Description

Transmission deversity scheme in the single carrier block transmission of multiple antenna communication

Technical field

The present invention relates to a kind of transmission deversity scheme in the single carrier block transmission of multiple antenna communication, this transmission deversity scheme becomes insensitive during to channel and has low complex degree, and is particularly suitable for such as multiple antenna communications such as multiple-input and multiple-output (MIMO) antenna communication systems.

Background technology

The transfer of data of carrying out two-forty in high-speed mobile environment is one of focus of current wireless communication systems concern.Wherein, the channel dispersion problem of how resisting under the high speed information transmission is to need one of subject matter that solves.

For the frequency-selective channel chromatic dispersion, can be used at present wherein effective transmission technique mainly contain two classes: OFDM (OFDM) transmission technology and based on single carrier (SC) the piece transmission technology of frequency domain equalization (FDE).

To introduce SC piece transmission technology below.

Compare in the frequency domain transmission with data among the OFDM, the data among the SC are transmitted in time domain, so the SC transmission has the advantage of low-power peak-to-average ratio (PAPR).Low PAPR is very important for the utilance that improves transmitted power, the distortion factor that reduces signal and quantification order.And in OFDM, can bring very high PAPR when the parallel data flow of frequency domain transforms to the time domain transmission.Simultaneously, from implementation complexity, if adopt the FDE technology, the implementation complexity of SC transmission technology is almost the same with the OFDM transmission technology.Based on this reason, the SC transmission technology is subjected to people's attention just day by day, has become in the 3GPP Long Term Evolution (LTE) in the up link one of the most competitive transmission means (up link for the requirement of low PAPR than the down link height) at present.

Figure 1 shows that the schematic diagram of traditional single antenna SC block transmission system structure.

At transmitting terminal, at first, carry out chnnel coding and constellation modulation to sent data flow at code device 101 and modulating device 102 places, then, at chunk device 103 places to modulating the symbols streams piecemeal (block length is N) of back serial.Afterwards, insert GI device 104 places, between data block and data block, inserting protection (GI) at interval.At last it is sent from antenna 105.Inserting GI device 104 places, the same with ofdm system, generally adopt the preceding method of inserting Cyclic Prefix (CP) of each data block, be about to the last N of each data block _GBe put into the head of this data block behind the individual data copy, wherein N _GBe the length of GI, require it to be not less than channel maximum delay length.

At receiving terminal, at first spacing wave is received by reception antenna 111.Then, carry out channel estimating according to pilot signal in this received signal or employing additive method, estimate current time domain channel impulse response h by channel estimating apparatus 118.Simultaneously, at removal GI device 112 places the GI in the received signal is partly removed.Then, be that the reception data block of N is carried out N point fast Fourier conversion (FFT), FDE (frequency domain equalization) and the anti-fast fourier transform of N point to length successively at fast fourier transformation apparatus 113, frequency domain equalization device 114 and anti-fast fourier transformation apparatus 115 places respectively, wherein the current characteristic of channel of utilizing channel estimating apparatus 118 to obtain in the frequency domain equalization device 114 is carried out frequency domain equalization to signal.Next, the signal that equilibrium is exported carries out demodulation 116 and channel decoding 117 successively, obtains original transmission data at last.

As seen, the transmission of data and to receive all be unit with the data block in the SC block transmission system here.The principle of SC-FDE can further describe with following mathematical form.

At first, channel can be described as finite impulse response (FIR) filter on Lc rank, promptly channel impulse response h=h (0), h (1) ..., h (Lc-1) }.Then n signal can be expressed as in the time domain i piece after GI device 112 is handled through removing:

$r_i\left(n\right)=\underset{k=0}{\overset{\mathrm{Lc}-1}{\mathrm{\Σ}}}h\left(k\right)s_i\left({(n-k)}_N\right)+n\left(n\right),0\≤n\≤N-1---\left(1\right)$

Wherein, { s _i(n) _N=0 ^N-1Represent N the data that i data block sends, (k) _NRemainder behind the expression k mould N, n (n) is additive white Gaussian noise (AWGN).

By following formula as seen, SC transmission technology and OFDM transmission technology are quite similar from the signal form, all are the results who sends signal and channel impulse circular convolution.So, on frequency domain, that is, just can be presented as the result who sends signal frequency domain and channel frequency domain product to received signal after the FFT, that is:

R _i(k)＝H(k)S _i(k)+N(k) 0≤k≤N-1 (2)

Wherein, R _i(k) i of expression receives data block FFT numerical value on the frequency domain k point afterwards, and H (k) is a numerical value on the channel frequency domain k point, S _i(k) i of expression sends after the data block FFT numerical value on the frequency domain k point, and N (k) represents numerical value on the noise frequency domain k point.

Therefore, the SC signal can carry out equilibrium by simple FDE mode, balanced and least mean-square error (MMSE) equilibrium as ZF (ZF).With balanced operator representation is W={W (0), W (1) ..., W (N-1) }, wherein W (k) is the balanced operator on the subcarrier in frequency domain k, then the time-domain signal behind FDE and IFFT is output as:

${\hat{r}}_1=\mathrm{IFFT}\{R_i\left(0\right)W\left(0\right),R_i\left(1\right)W\left(1\right),...,R_i(N-1)W(N-1)\}---\left(3\right)$

When adopting ZF balanced, W (k)=1/H (k) is arranged; When adopting MMSE balanced, have $W\left(k\right)=\frac{H^{*}\left(k\right)}{{\left|H\left(k\right)\right|}^2+1/\mathrm{\ρ}},$ Wherein ρ is a signal to noise ratio (snr).

Transmission deversity scheme in the transmission of SC piece

Transmission and the equalization methods in the SC piece transmission of traditional single antenna communication system introduced in the front.Know that multi-antenna transmitting transferring technology (MIMO) has become an important transmission means in the following radio communication at present.In mimo system, transmitting terminal utilizes many antennas to carry out the transmission of signal, and receiving terminal utilizes many antennas to carry out the reception of spacing wave.Studies show that than traditional single antenna transmissions method, the MIMO technology can effectively improve the transmission rate and the performance of signal.

The transmission of SC piece combines with MIMO's, can realize high-speed data transmission on frequency-selective channel.Based on the limited consideration of uplink transmission power, the sending method that suggestion up employing SC and many antenna transmission diversity combine among the LTE.At present, provided a kind of transmission deversity scheme of the SC of being used for piece transmission in the pertinent literature and caused extensive concern, this method can be regarded as traditional Alamouti and sends the expansion of diversity under the transmission of SC piece.The implementation structure of this method as shown in Figure 2.

Figure 2 shows that the SC piece transmission in traditional multiple antenna communication sends the schematic diagram that divides structure set.

At transmitting terminal, data to be sent are at first modulated through chnnel coding and constellation in chnnel coding and modulating device 201.Carry out chunk at chunk device 202 places then.The length of the every symbolic blocks behind the chunk is N.Afterwards, 2 adjacent symbolic blocks are carried out the piece Space Time Coding, and export 2 circuit-switched data pieces, the corresponding transmitting antenna of every circuit-switched data piece at piece space-time coding device 203 places.Next, inserting 204 pairs of every circuit-switched data pieces insertion protections of GI device at interval respectively.At last it is sent from each self-corresponding transmitting antenna 205.At this moment, the transmission data format on two transmitting antennas as shown in Figure 3.

Figure 3 shows that the SC piece transmission of traditional multiple antenna communication sends the schematic diagram of each the antenna data form under the diversity.

In Fig. 3, suppose the signal s of i piece before piece Space Time Coding 203 _i=[s _i(0), s _i(1) ..., s _i(N-1)] ^TRepresent that its length is N, T shows matrix transpose.As shown in Figure 3, antenna 1 and 2 sends signal s constantly respectively at piece 2i _2i=[s _2i(0), s _2i(1) ..., s _2i(N-1)] ^TAnd s _2i+1=[s _2i+1(0), s _2i+1(1) ..., s _2i+1(N-1)] ^T Antenna 1 and 2 sends signal-s* constantly respectively at piece 2i+1 _2i+1((N-n) _N)=[-s* _2i+1(0) ,-s* _2i+1(N-1) ... ,-s* _2i+1(1)] ^TAnd s* _2i((N-n) _N)=[s* _2i(0), s* _2i(N-1) ..., s* _2i(1)] ^T, wherein (x) _NExpression x gets remainder to N.

According to the correlation theory of Digital Signal Processing, when sending by data format shown in Figure 3, the signal frequency-domain form as shown in Figure 4 on two transmitting antennas.

Figure 4 shows that the SC piece transmission of traditional multiple antenna communication sends the frequency domain form schematic diagram of each antenna data under the diversity.

In Fig. 4, suppose i block signal s _i=[s _i(0), s _i(1) ..., s _i(N-1)] frequency-region signal is expressed as S _i=[S _i(0), S _i(1) ..., S _i(N-1)], S is promptly arranged _i=FFT{s _i.Thus, as shown in Figure 4, antenna 1 and the 2 frequency-region signal S that send respectively in the piece 2i moment _2i=[S _2i(0), S _2i(1) ..., S _2i(N-1)] ^TAnd S _2i+1=[S _2i+1(0), S _2i+1(1) ..., S _2i+1(N-1)] ^T Antenna 1 and 2 frequency-region signals that send respectively constantly at piece 2i+1 are-S ^* _2i+1=[S ^* _2i+1(0) ,-S ^* _2i+1(1) ... ,-S ^* _2i+1(N-1)] ^TAnd S ^* _2i=[S ^* _2i(0), S ^* _2i(1) ..., S ^* _2i(N-1)] ^T

Can find that on same subcarrier k, the frequency-region signal of two antennas on two adjacent blocks just in time constitutes traditional Alamouti signal structure, and be as shown in table 1 below such as the transmission signal frequency domain form on subcarrier k:

	Piece 2i	Piece 2i+1
			Antenna 1	S 2i(k)	-S* 2i+1(k)
Antenna 2	S 2i+1(k)	S* 2i(k)

Transmission signal frequency domain form signal on the table 1 subcarrier k

According to the MIMO correlation theory, the advantage that Alamouti sends diversity is that receiving terminal can obtain the performance of maximum likelihood (ML) with the linearity test of low complex degree, thereby can obtain effectively to send diversity performance.Receiver structure under the SC piece transmission transmission diversity shown in Figure 3 as shown in Figure 5.

Figure 5 shows that traditional SC piece transmission sends the receiver structure signal under the diversity.

At receiving terminal, two send adjacent block at first by n _R Individual reception antenna 301 receives the whole signals in space, and carries out channel estimating by channel estimating apparatus 309 according to pilot signal in this received signal or employing additive method, estimates the current characteristic of channel.Then, removing GI is removed at GI device 302 places to the received signal on each antenna operation respectively.Remove after the GI, respectively at string and conversion equipment 303 with go here and there to the received signal on each reception antenna at FFT device 304 places and conversion and FFT operation.Then, at frequency domain equalization device 305 to this n _RThe frequency-region signal that is received on the individual reception antenna carries out the FDE operation together.Wherein, frequency domain equalization device 305 is balanced one by one to each subcarrier, promptly on the same subcarrier, 4 frequency-region signals sending out on two adjacent blocks of two antennas carry out linear frequency domain equalization together by traditional Alamouti mode.Next, at IFFT device 306 places 2 road signals of frequency domain equalization device 305 outputs are carried out the IFFT operation, and go here and there conversion equipment 307 places and carry out and go here and there conversion, and be in harmonious proportion code translator 308 places and carry out symbol demodulation and channel decoding separating, obtain original transmission data at last.

Yet sending correlation theory by traditional Alamouti can know, this transmission deversity scheme during for channel no-load voltage ratio responsive, it requires the characteristic of channel in the adjacent S C piece to remain unchanged.This point often is difficult to satisfy in following real system, mainly contains two aspect reasons.Be that future mobile communications will be towards more high-speed mobile user on the one hand, the high-speed mobile of travelling carriage will be brought the time change of channel inevitably.On the other hand, by the SC system configuration as can be known, generally each SC piece is longer in time, much larger than mark space (can comprise thousands of such as a piece and send symbol), therefore requires invariable often being difficult to of channel to satisfy in so long-time.

For existing method, become during channel in the adjacent S C piece and will bring received signal non-orthogonal on frequency domain, thus the deterioration that brings receptivity.Therefore, can design the transmission of a kind of SC of being used for piece to channel the time to become transmission deversity scheme insensitive, low complex degree be the important topic that the transmission of MIMO-SC piece is concerned about.

Summary of the invention

The object of the present invention is to provide a kind of transmission deversity scheme in the single carrier block transmission of multiple antenna communication, this transmission deversity scheme becomes insensitive during to channel and has low complex degree, and is particularly suitable for such as multiple antenna communications such as multiple-input and multiple-output (MIMO) antenna communication systems.

To achieve these goals, according to the present invention, a kind of transmission deversity scheme in the single carrier block transmission of multiple antenna communication has been proposed, comprise: at transmitting terminal, at riches all the way antennas, riches all the way that antennas sends at interval and by described directly original one-tenth block signal to be inserted protection, at another road transmitting antenna, at first original one-tenth block signal is carried out the two-way parallel processing, to summation of the signal after the parallel processing and insertion protection interval, and send by described another road transmitting antenna, wherein said two-way parallel processing is made of conjugation replacement Treatment and characteristic sequence weighted respectively; At receiving terminal, 4 frequency-region signals that sent by described riches all the way antennas and described another road transmitting antenna that receive are carried out linear equalization together by the Alamouti mode on adjacent two subcarriers.

Preferably, be respectively s by described riches all the way antennas and described another road transmitting antenna at the signal that piece i sends constantly _iAnd Ps ^* _i, P=W wherein ₁P ₁+ W ₂P ₂, P ₁And P ₂Be respectively the permutation matrix in the two-way parallel processing, W ₁And W ₂Be respectively the characteristic sequence weighting matrix in the two-way parallel processing.

Preferably,

${\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">W</figure-callout>}}_1=\mathrm{diag}\{-j\sin \frac{2\mathrm{\&pi;}\&CenterDot;0}{N},-j\sin \frac{2\mathrm{\&pi;}(N-1)}{N},-j\sin \frac{2\mathrm{\&pi;}(N-2)}{N},\&CenterDot;\&CenterDot;\&CenterDot;,-j\sin \frac{2\mathrm{\&pi;}\&CenterDot;0}{N}\};$ And

${\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">W</figure-callout>}}_2=\mathrm{diag}\{-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;(N/2)}{N},-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}(N/2-1)}{N},\&CenterDot;\&CenterDot;\&CenterDot;,-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;0}{N},-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}(N-1)}{N},-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;(N-2)}{N},\&CenterDot;\&CenterDot;\&CenterDot;,-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;(N/2+1)}{N}\}$

。

Preferably, the frequency-region signal that is sent by described riches all the way antennas and described another road transmitting antenna that receives at receiving terminal is respectively S _i=[S _i(0), S _i(1) ..., S _i(N-1)] ^TAnd S ' _i=[S ^* _i(1), S ^* _i(0) ,-S ^* _i(3), S ^* _i(2) ... ,-S ^* _i(N-1), S ^* _i(N-2)] ^T, the frequency-region signal on two adjacent sub-carrier 2k and 2k+1 has constituted the Alamouti signal structure.

Preferably, described 4 frequency-region signals that send on adjacent two subcarriers at receiving terminal step of carrying out linear equalization together by the Alamouti mode comprises: carry out linear frequency domain equalization at 4 frequency-region signals that sent on two adjacent sub-carrier 2k and 2k+1 by described riches all the way antennas and described another road transmitting antenna together by the Alamouti mode.

Preferably, described multiple antenna communication is the multi-input/output antenna communication system.

To achieve these goals, according to the present invention, also proposed a kind of transmission diversity system in the single carrier block transmission of multiple antenna communication, having comprised: at transmitting terminal, the chunk device carries out chunk respectively to the signal to be sent at the two-way transmitting antenna; Insert the protection escapement, riches all the way that antennas sends at interval and by described to be used for that directly the signal behind the chunk of riches all the way at two-way transmitting antenna antennas is inserted protection, and the signal after handling at the two-way parallel processing of another road transmitting antenna in the two-way transmitting antenna and summing unit is inserted protection send at interval and by described another road transmitting antenna; Two-way parallel processing and summing unit, at another road transmitting antenna in the two-way transmitting antenna, at first to carrying out the two-way parallel processing at the signal behind the chunk of described another road transmitting antenna, to the signal after parallel processing summation and output to described insertion protection escapement, wherein said two-way parallel processing is made of conjugation replacement Treatment and characteristic sequence weighted respectively; At receiving terminal, the frequency domain equalization device carries out linear equalization to 4 frequency-region signals that sent by described riches all the way antennas and described another road transmitting antenna that receive together by the Alamouti mode on adjacent two subcarriers.

According to the present invention, change the space time transmit diversity of conventional method frequency domain signal into sky and take place frequently and send diversity, thereby become the mis-behave that is brought can effectively resist channel the time, keep the low complex degree that sends and receive simultaneously.

Description of drawings

Below in conjunction with the detailed description of preferred embodiment of accompanying drawing to being adopted, above-mentioned purpose of the present invention, advantage and feature will become apparent by reference, wherein:

Fig. 1 is the schematic diagram that shows traditional single antenna SC block transmission system structure;

Fig. 2 shows traditional many antennas SC piece transmission to send the schematic diagram that divides structure set;

Fig. 3 shows the schematic diagram that traditional many antennas SC piece transmission sends each the antenna data form under the diversity;

Fig. 4 shows the schematic diagram that traditional many antennas SC piece transmission sends each the antenna data frequency domain form under the diversity;

Fig. 5 shows the schematic diagram that traditional many antennas SC piece transmission sends the receiver structure under the diversity;

Fig. 6 is that the many antennas SC piece transmission that shows according to the embodiment of the invention sends the schematic diagram that divides structure set;

Fig. 7 shows the schematic diagram that sends each the antenna data form under the diversity according to many antennas SC piece transmission of the embodiment of the invention;

Fig. 8 shows the schematic diagram that sends each the antenna data frequency domain form under the diversity according to many antennas SC piece transmission of the embodiment of the invention;

Fig. 9 is the schematic diagram that shows according to the receiving system of the transmission signal of the embodiment of the invention; And

Figure 10 is the schematic diagram that shows the performance comparison result of the method applied in the present invention and conventional method.

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.

Figure 6 shows that the many antennas SC piece transmission according to the embodiment of the invention sends the schematic diagram that divides structure set.

Among Fig. 6, still at first carry out chnnel coding and constellation modulation at coding and modulating device 401 places to sent data, then, 402 places carry out chunk to it at the chunk device, and every symbolic blocks length is N behind the chunk.Next,, inserting GI device 405 places, directly sending after inserting GI between block signal becoming at riches all the way antennas; And for another road antenna, at first original one-tenth block signal is carried out the two-way parallel processing, signal after 407 pairs of parallel processings of summing unit summation then, insert GI at insertion GI device 405 places again and send, wherein said every road parallel processing constitutes by conjugation displacement apparatus 403 and characteristic sequence weighting device 404.At this moment, the transmission data format on two transmitting antennas as shown in Figure 7.

Figure 7 shows that many antennas SC piece transmission according to the present invention sends the schematic diagram of each the antenna data form under the diversity.

In Fig. 7, suppose the i block signal s after chunk _i=[s _i(0), s _i(1) ..., s _i(N-1)] ^TRepresent that its length is N, T shows matrix transpose.As shown in Figure 7, antenna 1 and 2 sends signal s constantly respectively at piece i _i=[s _i(0), s _i(1) ..., s _i(N-1)] ^TAnd Ps ^* _i=P[s ^* _i(0), s ^* _i(1) ..., s ^* _i(N-1)] ^T, P=W wherein ₁P ₁+ W ₂P ₂, P ₁And P ₂Displacement 1 in the corresponding diagram 6 and displacement 2 operations 403 respectively, W ₁And W ₂Weighting device 1 in the corresponding diagram 6 and the operation in the weighting device 2 respectively.

Particularly, inserting GI signal processing before on No. the second transmitting antenna comprises:

(1) to becoming block signal to carry out the conjugation displacement;

Here, at first to the i block signal s after the chunk _i=[s _i(0), s _i(1) ..., s _i(N-1)] ^TGetting conjugation replaces then.Replacement operator promptly is the position of each signal in the former data block of conversion, and replacement operator can be described with the premultiplication permutation matrix from the mathematics.Among Fig. 6, the replacement operator of two paths of signals can be used N * N matrix P respectively ₁And P ₂Describe.Then can be expressed as P through the two paths of signals after the conjugation displacement ₁s ^* _iAnd P ₂s ^* _i, wherein

i＝1，…，N；j＝1，…，N

And

i＝1，…，N；j＝1，…，N。

(2) signal after the displacement is carried out the characteristic sequence weighting;

Here, respectively to the signal P after the conjugation displacement ₁s ^* _iAnd P ₂s ^* _iCarry out the characteristic sequence weighting, sequence weighting operation can be described with the premultiplication diagonal matrix.Among Fig. 6, the characteristic sequence weighting of two paths of signals operation can be used N * N diagonal matrix W respectively ₁And W ₂Describe.Then can be expressed as W through the two paths of signals after the sequence weighting ₁P ₁s ^* _iAnd W ₂P ₂s ^* _i, wherein

${\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">W</figure-callout>}}_1=\mathrm{diag}\{-\mathrm{<figure-callout\; id="2"\; label="j\; sin"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}\sin \frac{2\mathrm{\&pi;}\&CenterDot;0}{N},-\mathrm{<figure-callout\; id="2"\; label="j\; sin"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}\sin \frac{2\mathrm{\&pi;}(N-1)}{N},-\mathrm{<figure-callout\; id="2"\; label="j\; sin"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}\sin \frac{2\mathrm{\&pi;}(N-2)}{N},\&CenterDot;\&CenterDot;\&CenterDot;,-\mathrm{<figure-callout\; id="2"\; label="j\; sin"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}\sin \frac{2\mathrm{\&pi;}\&CenterDot;0}{N}\}$

${\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">W</figure-callout>}}_2=\mathrm{diag}\{-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;(N/2)}{N},-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}(N/2-1)}{N},\&CenterDot;\&CenterDot;\&CenterDot;,-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;0}{N},-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}(N-1)}{N},-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;(N-2)}{N},\&CenterDot;\&CenterDot;\&CenterDot;,-\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}\&CenterDot;(N/2+1)}{N}\}$

(3) signal after the two-way parallel processing is sued for peace.

At last, the signal after obtaining suing for peace is W ₁P ₁s ^* _i+ W ₂P ₂s ^* _i

When adopting inventive method shown in Figure 6 to carry out the signal transmission, can obtain frequency-region signal form shown in Figure 8.

Figure 8 shows that the schematic diagram that sends each the antenna data frequency domain form under the diversity according to many antennas SC piece transmission of the embodiment of the invention.

Wherein, antenna 1 and 2 frequency-region signals that send are respectively S _i=[S _i(0), S _i(1) ..., S _i(N-1)] ^TAnd S ' _i=[S ^* _i(1), S ^* _i(0) ,-S ^* _i(3), S ^* _i(2) ... ,-S ^* _i(N-1), S ^* _i(N-2)] ^TIn following supplemental instruction, provided the explanation that can obtain the frequency-region signal form of Fig. 8 when sending by Fig. 6 inventive method.

As seen from the figure, the method according to this invention, the frequency-region signal of two antennas on two adjacent sub-carrier 2k and 2k+1 just in time constitutes traditional Alamouti signal structure, and be as shown in table 2 below:

	Subcarrier 2k	Subcarrier 2k+1
			Antenna 1	S i(2k)	S i(2k+1)
Antenna 2	-S * i(2k+1)	S * i(2k)

Transmission signal frequency domain form signal on table 2 subcarrier 2k and the 2k+1

The front is mentioned, and this kind send mode requirement same antenna sends two pairing characteristics of channel of signal and remains unchanged as far as possible.In conventional method, transmit on adjacent in time two pieces of two signals on the same antenna, as table one, the long cause of the high-speed mobile of travelling carriage and block length makes that this condition often is difficult to satisfy.And in the method for the invention, it is defeated that two the adjacent subcarriers on frequency domain of two signals on the same antenna are uploaded, as table two.Can be known that by correlation theory the characteristic of channel in the frequency domain on the adjacent sub-carrier has very strong correlation, both are almost consistent.That is to say the performance loss under becoming when method of the present invention can more effectively be resisted channel.

For MIMO-SC sending method of the present invention shown in Fig. 6, can adopt receiving system shown in Figure 9 to receive.

Figure 9 shows that schematic diagram according to the receiving system of the transmission signal of the embodiment of the invention.

As seen from Figure 9, quite similar to the method that receiving course and the traditional SC piece transmission among Fig. 5 according to the transmission signal of the inventive method send under the diversity, its unique difference is to have adopted new frequency domain equalization device 310 to carry out frequency domain equalization.

Particularly, the frequency domain equalization device 305 in Fig. 5 is balanced one by one to each subcarrier, promptly on the same subcarrier, 4 frequency-region signals sending out on two adjacent blocks of two antennas carry out linear frequency domain equalization simultaneously by traditional Alamouti mode.And in the method for the invention, owing to be that the frequency-region signal of two antennas on two adjacent sub-carrier 2k and 2k+1 constitutes traditional Alamouti signal structure, therefore, 310 pairs of per two subcarriers of frequency domain equalization device among Fig. 9 are balanced together, and promptly 4 frequency-region signals that two antennas are sent out on two adjacent sub-carrier 2k and 2k+1 carry out linear frequency domain equalization together by traditional Alamouti mode.Its equalization algorithm is just the same with traditional method, only input different (inputs of equalizer by on the same subcarrier in the conventional method, two antennas become 4 frequency-region signals that two antennas are sent out at 4 frequency-region signals sending out on two adjacent blocks on two adjacent sub-carrier 2k and 2k+1) is not therefore being given unnecessary details here.

Figure 10 shows that the performance schematic diagram relatively of the method applied in the present invention and conventional method.

The channel model that adopts in the emulation is M.1225 channel model A of ITU, and channel width is 10MHz, N=1024.Transmitting antenna and reception antenna number are respectively 2 and 1, adopt the QPSK modulation.F among Figure 10 _dBe maximum doppler frequency, T is each transmission block time span.As seen from Figure 10, for existing method, its performance of the increase that becomes during along with channel can run down.And inventive method becomes the performance loss that is brought can resist channel relatively effectively the time, and method of sending and receiving still keeps low complex degree.In addition, compare with conventional method, transmitting terminal has adopted the operation that sends weighting, but owing to be the two-way weighting only, and weighting sequence is the cosine and sine signal sequence, so inventive method is little to the influence that PAPR brings.

The supplemental instruction of frequency-region signal form that can obtain Fig. 8 when sending by inventive method shown in Figure 6 is as follows:

Making the frequency-region signal on first transmitting antenna is S _i=[S _i(0), S _i(1) ..., S _i(N-1)] ^T, the frequency-region signal S ' on second transmitting antenna then _i=[S ^* _i(1), S ^* _i(0) ,-S ^* _i(3), S ^* _i(2) ... ,-S ^* _i(N-1), S ^* _i(N-2)] ^TCan be expressed as S ' _i=(AS _i) *, wherein A is N * N matrix, has

$A=\left[\begin{array}{cccccc}0& -1& & & & \\ 1& 0& & & & \\ & & ...& ...& & \\ & & ...& ...& & \\ & & & & 0& -1\\ & & & & 1& 0\end{array}\right]$

Suppose to exist N * N Matrix C, make FFT{Cs _i}=AS _i, then, FFT{BC*s is arranged according to the signal processing correlation theory ^* _i}=(AS _i) *, wherein

Find the solution C below emphatically.Make F _NFor the FFT matrix, promptly have ${\left[F_N\right]}_{l,k}=\frac{1}{\sqrt{N}}{e}^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;lk}/N}.$ Further derive and obtain $C=F_N^H{\mathrm{AF}}_N,$ Promptly have ${\left[C\right]}_{l,k}=\frac{1}{N}\underset{m=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{A}_{m,n}{e}^{\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}[(l-1)(m-1)-(n-1)(k-1)]},$ Obtain according to the further abbreviation of the sparse characteristic of A matrix again

${\left[C\right]}_{l,k}=\frac{1}{N}\underset{m=1}{\overset{N/2}{\mathrm{\&Sigma;}}}[{\mathrm{<figure-callout\; id="2"\; label="e\; j"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">e</figure-callout>}}^j-{\mathrm{<figure-callout\; id="2"\; label="e\; j"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">e</figure-callout>}}^j],$ Obtain at last

${\left[C\right]}_{l,k}=\left\{\begin{array}{cc}\mathrm{<figure-callout\; id="2"\; label="j\; sin"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">j</figure-callout>}\sin \frac{2\mathrm{\&pi;}(k-1)}{N}& l=k\\ -\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="A20061007141400191.png,A20061007141400211.png"\; state="\{\{state\}\}">cos</figure-callout>}\frac{2\mathrm{\&pi;}(k-1)}{N}& |l-k|=N/2\\ 0& \mathrm{others}\end{array}\right.$

And W arranged ₁P ₁+ W ₂P ₂=BC* is so must demonstrate,prove.

Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited by the foregoing description, and should be limited by claims and equivalent thereof.

Claims (7)

1, a kind of transmission deversity scheme in the single carrier block transmission of multiple antenna communication comprises:

At transmitting terminal,

At riches all the way antennas, riches all the way that antennas sends at interval and by described directly original one-tenth block signal to be inserted protection,

At another road transmitting antenna, at first original one-tenth block signal is carried out the two-way parallel processing, to summation of the signal after the parallel processing and insertion protection interval, and send by described another road transmitting antenna, wherein said two-way parallel processing is made of conjugation replacement Treatment and characteristic sequence weighted respectively;

At receiving terminal,

4 frequency-region signals that sent on adjacent two subcarriers by described riches all the way antennas and described another road transmitting antenna that receive are carried out linear equalization together by the Alamouti mode.

2, method according to claim 1 is characterized in that: be respectively s by described riches all the way antennas and described another road transmitting antenna at the signal that piece i sends constantly _iAnd Ps ^* _i, P=W wherein ₁P ₁+ W ₂P ₂, P ₁And P ₂Be respectively the permutation matrix in the two-way parallel processing, W ₁And W ₂Be respectively the characteristic sequence weighting matrix in the two-way parallel processing.

3, method according to claim 2 is characterized in that

i＝1，…，N；j＝1，…，N；

i＝1，…，N；j＝1，…，N；

$W_1=\mathrm{diag}\{-j\sin \frac{2\mathrm{\&pi;}\&CenterDot;0}{N},-j\sin \frac{2\mathrm{\&pi;}(N-1)}{N},-j\sin \frac{2\mathrm{\&pi;}(N-2)}{N},...,-j\sin \frac{2\mathrm{\&pi;}\&CenterDot;0}{N}\};$ And

$W_2=\mathrm{diag}\{-\cos \frac{2\mathrm{\&pi;}\&CenterDot;(N/2)}{N},-\cos \frac{2\mathrm{\&pi;}(N/2-1)}{N},...,-\cos \frac{2\mathrm{\&pi;}\&CenterDot;0}{N}-\cos \frac{2\mathrm{\&pi;}\&CenterDot;(N-1)}{N}-\cos \frac{2\mathrm{\&pi;}\&CenterDot;(N-2)}{N},...,-\cos \frac{2\mathrm{\&pi;}\&CenterDot;(N/2+1)}{N}\}$

。

4, method according to claim 1 is characterized in that: the frequency-region signal that is sent by described riches all the way antennas and described another road transmitting antenna that receives at receiving terminal is respectively S _i=[S _i(0), S _i(1) ..., S _i(N-1)] ^TAnd S ' _i=[S ^* _i(1), S ^* _i(0) ,-S ^* _i(3), S ^* _i(2) ... ,-S ^* _i(N-1), S ^* _i(N-2)] ^T, the frequency-region signal on two adjacent sub-carrier 2k and 2k+1 has constituted the Alamouti signal structure.

5, method according to claim 4 is characterized in that: the step that described 4 frequency-region signals that send on adjacent two subcarriers at receiving terminal carry out linear equalization together by the Alamouti mode comprises: carry out linear frequency domain equalization at 4 frequency-region signals that sent on two adjacent sub-carrier 2k and 2k+1 by described riches all the way antennas and described another road transmitting antenna together by the Alamouti mode.

6, method according to claim 1 is characterized in that described multiple antenna communication is the multi-input/output antenna communication system.

7, a kind of transmission diversity system in the single carrier block transmission of multiple antenna communication comprises:

At transmitting terminal,

The chunk device carries out chunk respectively to the signal to be sent at the two-way transmitting antenna;

Insert the protection escapement, riches all the way that antennas sends at interval and by described to be used for that directly the signal behind the chunk of riches all the way at two-way transmitting antenna antennas is inserted protection, and the signal after handling at the two-way parallel processing of another road transmitting antenna in the two-way transmitting antenna and summing unit is inserted protection send at interval and by described another road transmitting antenna;

Two-way parallel processing and summing unit, for another road transmitting antenna in the two-way transmitting antenna, at first to carrying out the two-way parallel processing at the signal behind the chunk of described another road transmitting antenna, to the signal after parallel processing summation and output to described insertion protection escapement, wherein said two-way parallel processing is made of conjugation replacement Treatment and characteristic sequence weighted respectively;

At receiving terminal,

The frequency domain equalization device carries out linear equalization to 4 frequency-region signals that sent by described riches all the way antennas and described another road transmitting antenna that receive together by the Alamouti mode on adjacent two subcarriers.

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