CN103780528A - Communication system and signal sending method and apparatus as well as signal receiving method and apparatus thereof - Google Patents

Abstract

The invention provides a communication system and a signal sending method and apparatus as well as signal receiving method and apparatus thereof. The signal sending apparatus comprises a coding modulation unit, a first processing unit and an OFDM modulation unit, wherein the coding modulation unit is suitable for, based on channel information, carrying out channel coding and constellation mapping on each sub-data stream to be sent; the first processing unit is suitable for carrying out spreading spectrum and multiple input multiple output sending process; and the OFDM modulation unit is suitable for carrying out OFDM modulation and outputting OFDM symbol data stream obtained after the OFDM modulation to a transmitting antenna for transmitting. The signal receiving apparatus comprises an OFDM demodulation unit, a second processing unit and a demodulation decoding unit, wherein the OFDM demodulation unit is suitable for carrying out OFDM demodulation on baseband signals received by receiving antennas; the second processing unit is suitable for carrying out multiple input multiple output receiving process and de-spreading spectrum operation; and the demodulation decoding unit is suitable for carrying out constellation de-mapping and channel decoding, and thus target data is obtained. The technical scheme of the invention is capable of effectively resisting frequency selective fading and the interference of co-frequency neighbor cells, so that the communication system is allowed to have high stability, high throughput and co-frequency networking capability.

Description

Communication system and signaling method thereof and device, signal acceptance method and device

Technical field

The present invention relates to the communications field, particularly the signal acceptance method of the signaling method of a kind of communication system, communication system and device and communication system and device.

Background technology

OFDM (OFDM, Orthogonal Frequency Division Multiplexing) technology is utilized the orthogonality between each subcarrier, allows the frequency spectrum of subchannel overlapped, has effectively improved the availability of frequency spectrum.By the serial to parallel conversion of data flow, the data symbol duration on each subcarrier increases greatly, and the adding of Cyclic Prefix, and effectively reduces intersymbol interference (ISI, Inter Symbol Interference).Because each subcarrier bandwidth is narrower, can carry out equalization operation for each subcarrier, greatly simplify the complexity of receiver.OFDM technology is widely applied in Long Term Evolution (LTE, the Long Term Evolution) system of 3G and WLAN (wireless local area network) (WLAN, Wireless Local Area Networks) system.But OFDM technology does not have defensive ability/resistance ability substantially for the interference of co-frequency neighbor cell, is difficult to realize identical networking.

Multiple-input, multiple-output (MIMO, Multiple-Input Multiple-Output) technology refers at transmitting terminal and receiving terminal, uses respectively multiple transmitting antennas and reception antenna.Its basic thought is in transmitting, receives and adopt multiple antennas, and treatment technology during by sky, makes full use of the autonomous behavior of interchannel, improves the availability of frequency spectrum, communication quality and power system capacity.Independent wireless channel between MIMO technology makes full use of and transmits and receives, transmitting antenna is sent multiple different data flow and is all had differentiable spatial character at receiving terminal, therefore can regard as by the parallel subchannel of minimum number of antennas in the antenna of two ends and form, the capacity of whole mimo channel be exactly all subchannel capacities and.

The communication system of multi-input multi-output-orthogonal frequency-division multiplexing of the prior art, combines two kinds of technology of OFDM and MIMO, can improve the availability of frequency spectrum, reduces receiver equalization complexity, and can effectively improve the transmission rate of system.But existing MIMO-OFDM system is difficult to the interference of contrary frequency selectivity decline effectively and co-frequency neighbor cell.

Correlation technique can be also the U.S. Patent application of US2006067420 (A1) with reference to publication number, this Patent Application Publication a kind of MIMO OFDM mobile communication system and channel estimation methods.

Summary of the invention

The problem to be solved in the present invention is the interference that MIMO-OFDM system of the prior art is difficult to contrary frequency selectivity decline effectively and co-frequency neighbor cell.

For addressing the above problem, technical solution of the present invention provides a kind of signaling method of communication system, comprising:

According to channel information, carry out respectively chnnel coding and constellation mapping to sent every way data flow;

To carrying out spread spectrum operation and multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping;

Sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing is carried out to OFDM modulation, and send outputing to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation.

Optionally, described sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing is carried out to OFDM modulation, and sends and comprise outputed to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation:

Sub data flow after described spread spectrum operation and multiple-input, multiple-output transmission processing is inserted respectively to the frequency pilot sign of respective antenna port and is mapped to corresponding physical sub-carrier;

Respectively the sub data flow of each antenna port is carried out to serial to parallel conversion, and carry out inverse fast Fourier transform, insert Cyclic Prefix and output to transmitting antenna and send so that OFDM symbol is formed to physical frame.

Optionally, described sub data flow after the operation of described spread spectrum and multiple-input, multiple-output transmission processing is inserted respectively to the frequency pilot sign of respective antenna port and is mapped to corresponding physical sub-carrier comprise: insert the frequency pilot sign of respective antenna port and be mapped to each physical sub-carrier at identical character position.

For addressing the above problem, technical solution of the present invention also provides a kind of sender unit of communication system, comprising:

Coded modulation unit, is suitable for according to channel information, carries out respectively chnnel coding and constellation mapping to sent every way data flow;

The first processing unit, is suitable for carrying out spread spectrum operation and multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping;

OFDM modulating unit, is suitable for the sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing to carry out OFDM modulation, and sends outputing to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation.

For addressing the above problem, technical solution of the present invention also provides a kind of signal acceptance method of communication system, comprising:

The baseband signal that each reception antenna is received is carried out OFDM demodulation;

To carry out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation and separate spread spectrum operation;

By separating constellation mapping and channel decoding through the sub data flow of multiple-input, multiple-output reception & disposal and the operation of solution spread spectrum, obtain target data.

For addressing the above problem, technical solution of the present invention also provides a kind of signal receiving device of communication system, comprising:

OFDM demodulating unit, the baseband signal that is suitable for each reception antenna to receive is carried out OFDM demodulation;

The second processing unit, is suitable for carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation and separating spread spectrum operation;

Demodulation coding unit, is suitable for, by separating constellation mapping and channel decoding through the sub data flow of multiple-input, multiple-output reception & disposal and the operation of solution spread spectrum, obtaining target data.

For addressing the above problem, technical solution of the present invention also provides a kind of communication system that comprises above-mentioned sender unit and signal receiving device.

Compared with prior art, technical solution of the present invention at least has the following advantages:

By spread spectrum is organically applied in MIMO-OFDM communication system, spread spectrum and the despreading coefficient of design easy operating, and be that unit carries out spread spectrum operation to the each symbol in each elementary cell, in the time there is co-channel interference, despreading gain can suppress co-channel interference preferably, thereby the interference of the decline of contrary frequency selectivity and co-frequency neighbor cell, makes this communication system have the ability of high stability, high-throughput and identical networking effectively.

Insert the frequency pilot sign of respective antenna port and be mapped to each physical sub-carrier by the character position identical, making the each physical sub-carrier on arbitrary antenna port have pilot data, having reduced the complexity of channel estimating, having improved estimated accuracy.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the signaling method of the communication system that provides of embodiment of the present invention;

Fig. 2 is the schematic diagram of an elementary cell in system resource allocation;

Fig. 3 is the schematic flow sheet of the signaling method of the communication system of the embodiment of the present invention;

Fig. 4 is that the one of subcarrier mapping is implemented schematic diagram;

Fig. 5 is that the another kind of subcarrier mapping is implemented schematic diagram;

Fig. 6 is another enforcement schematic diagram of subcarrier mapping;

Fig. 7 is the structural representation of the sender unit of embodiment of the present invention communication system;

Fig. 8 is the schematic flow sheet of the signal acceptance method of the communication system that provides of embodiment of the present invention;

Fig. 9 is the schematic flow sheet of the signal acceptance method of the communication system of the embodiment of the present invention;

Figure 10 is the structural representation of the signal receiving device of embodiment of the present invention communication system;

Figure 11 is the schematic diagram of the communication system that provides of the embodiment of the present invention.

Embodiment

For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public embodiment.

In the MIMO-OFDM system of prior art, disturb the general method that adopts scheduling of resource to go to solve for co-frequency neighbor cell, namely the frequency domain resource different user assignment in cell edge is avoided to co-channel interference, but this method can increase the scheduling complexity of system, be therefore still difficult to the interference of contrary frequency selectivity decline effectively and co-frequency neighbor cell.Inventor considers, code division multiple access (CDMA, Code Division Multiple Access) technology has the ability of the decline of very strong antinoise signal and adjacent cell interference, be conducive to identical networking, if but the uplink code channel of CDMA is asynchronous, or the in the situation that of multipath serious interference, the orthogonality of code channel is just destroyed, must adopt multiuser detection technology to carry out signal recovery, but user too much and under multipath complicated situation, the performance of joint-detection also can decline, and multiuser detection technology is along with the increase operand exponent increase of number of users, greatly increase the complexity realizing, therefore be not suitable for broadband application.

Based on above-mentioned analysis, embodiment of the present invention provides a kind of method, CDMA technology is organically applied in MIMO-OFDM system, can distribute identical physical resource to different user in neighbor cell, by the data of frequency domain are carried out to spread processing, utilize the orthogonality between different code words to suppress co-channel interference.Such method has been simplified the scheduling complexity of system, and can well suppress co-channel interference.

It should be noted that, because CDMA technology is generally used for time domain, realize the diversity reception of multipath by RAKE receiver or joint-detection, and in technical solution of the present invention, CDMA technology is applied to frequency domain, utilize the orthogonality of code word and spreading gain that spread spectrum brings to suppress frequency domain interference, it is just thinkable that this is not that those skilled in the art are easy to.

Fig. 1 is the schematic flow sheet of the signaling method of the communication system that provides of embodiment of the present invention.As shown in Figure 1, the signaling method of described communication system comprises:

Step S1, according to channel information, carries out respectively chnnel coding and constellation mapping to sent every way data flow;

Step S2, to carrying out spread spectrum operation and multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping;

Step S3, carries out OFDM modulation to the sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing, and sends outputing to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation.

When concrete enforcement, channel information described in step S1 comprises channel quality indication (CQI, Channel Quality Indication), channel sequence indication (RI, Rank Indication), at least one in pre-coding matrix code indication (PMI, Precoding Matrix Indicator).Obtaining of above-mentioned channel information can obtain from receiving terminal feedback, also can obtain according to time-multiplexed up-downgoing symmetry at transmitting terminal.

Step S2 can have two kinds of implementations, and a kind of implementation is first to carry out spread spectrum operation then to carry out multiple-input, multiple-output transmission processing, and another kind of implementation is first to carry out multiple-input, multiple-output transmission processing then to carry out spread spectrum operation.

The first implementation of step S2 specifically can comprise:

Step S21, based on spread spectrum parameter, to carrying out spread spectrum operation through the sub data flow of chnnel coding and constellation mapping, described spread spectrum parameter at least comprises spreading factor and subcode road number;

Step S22, sub data flow after described spread spectrum operation is carried out to multiple-input, multiple-output transmission processing, described multiple-input, multiple-output transmission processing comprises: the sub data flow after described spread spectrum operation is carried out to layered mapping, the layer mapping of the layer mapping that described layered mapping is single antenna, the layer mapping of transmit diversity or spatial reuse; Sub data flow after layered mapping is carried out to corresponding precoding processing.

When step S2 adopts the first implementation, chnnel coding and constellation mapping (being step S1) afterwards and spread spectrum operation (being step S21) before, or spread spectrum operation (being step S21) afterwards and multiple-input, multiple-output transmission processing (being step S22) before, can also carry out randomization operation to every way data flow.

The second implementation of step S2 specifically can comprise:

Step S23, to carrying out multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping, described multiple-input, multiple-output transmission processing comprises: will carry out layered mapping through the sub data flow of described chnnel coding and constellation mapping, and the sub data flow after layered mapping is carried out to corresponding precoding processing;

Step S24, the sub data flow based on spread spectrum parameter after to described multiple-input, multiple-output transmission processing carries out spread spectrum operation, and described spread spectrum parameter at least comprises spreading factor and subcode road number.

When step S2 adopts the second implementation, chnnel coding and constellation mapping (being step S1) afterwards and multiple-input, multiple-output transmission processing (being step S23) before, or spread spectrum operation (being step S24) afterwards and OFDM modulation (being step S3) before, can also carry out randomization operation to every way data flow.

In the specific implementation, no matter be step S21 or step S23, the subcode road number while carrying out described spread spectrum operation is less than or equal to spreading factor.

Step S3 can comprise:

Step S31, inserts the sub data flow after described spread spectrum operation and multiple-input, multiple-output transmission processing respectively the frequency pilot sign of respective antenna port and is mapped to corresponding physical sub-carrier;

Step S32, respectively the sub data flow of each antenna port is carried out to serial to parallel conversion, and carry out inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform), insert Cyclic Prefix (CP, Cyclic Prefx) and output to transmitting antenna and send so that OFDM symbol is formed to physical frame.

Wherein, step S31 in the specific implementation, inserts the frequency pilot sign of respective antenna port and is mapped to each physical sub-carrier at identical character position.For the pilot settings mode of this kind of antenna port, will in the specific embodiment providing below, be further described.

In the specific implementation, the signaling method of described communication system can also comprise: before chnnel coding, or after chnnel coding and before constellation mapping, every way data flow is carried out to scrambling operation.

With specific embodiment, the signaling method of above-mentioned communication system is elaborated below.

First the elementary cell in system resource allocation is carried out to brief description.Fig. 2 is the schematic diagram of an elementary cell in system resource allocation, as shown in Figure 2, the elementary cell of communication system is time-frequency two-dimensional unit, transverse axis is time domain, and the present embodiment comprises 8 symbols, and the longitudinal axis is frequency domain, the present embodiment comprises 8 subcarriers, a symbol intervals is 137.5 μ s, and subcarrier spacing is 7.8125KHz, and the resource of system is distributed all as base unit.

The flow process of the signaling method of the communication system that the present embodiment provides is as shown in Figure 3:

Step S101, bit scramble.Particularly, to Nt data flow b ⁽⁰⁾..., b ^(Nt-1)carry out respectively scrambling processing, to reach the object of distinguishing base station.

Step S102, chnnel coding.Particularly, data flow after Nt scrambling is carried out respectively to chnnel coding, described chnnel coding can be Read-Solomon (RS) coding, convolutional encoding, Turbo coding or low-density checksum coding (LDPC, Low Density Parity Check Code) etc.

Step S103, constellation mapping.Particularly, the data flow after Nt chnnel coding is carried out respectively to constellation mapping, this step is the modulation treatment that coding carries out afterwards, and the mode of modulation can be BPSK, QPSK, 8PSK, 16QAM, 64QAM etc., and the modulation sequence of output is s ⁽⁰⁾..., s ^(Nt-1).

Step S104, frequency domain code expands.Particularly, according to the code expansion factor (spreading factor) and subcode road number, the data flow after Nt modulation is carried out to code expansion operation (spread spectrum operation) respectively, described code expands the subcarrier number that the factor is not more than an elementary cell in system resource allocation, and described subcode road number is not more than described code and expands the factor.Expand the factor 8 with code, subcode road number 4 is carried out description code for example and is expanded processing.Code expands to process and carries out according to formula c=WS, wherein

modulation continuous four data afterwards, W=[w ₀, w ₁, w ₂, w ₃], w ₀, w ₁, w ₂and w ₃be that code expands four code words that the factor is 8, length is that 8, c is exactly the data that code expands 8 subcarriers of correspondence after processing.

It should be noted that, for the complexity realizing is considered, 8 subcarriers that spread spectrum in the present embodiment operates on a symbol based in a sub-channels carry out, and can reach like this and utilize spread spectrum antagonism co-channel interference, and the while is increase implementation complexity how only.

Step S105, layer mapping.Particularly, to multiple data flow c ⁽⁰⁾..., c ^(Nt-1)carry out layer mapping, data flow number Nt is not more than the number of plies V of layering, and number of plies V is not more than antenna number M, and layer mapping is divided into the layer mapping of transmit diversity and the layer mapping of spatial reuse.In the embodiment of the present invention, be 2 take transmitting antenna and describe as example.

1, only transmit a code stream when transmit diversity, number of plies V equals the antenna port of physical channel transmission and counts M.Namely by code stream uniform mapping to M layer, the mapping of 2 antenna ports as shown in Equation (1):

$\left\{\begin{array}{c}{d}^{\left(0\right)}\left(i\right)=c^{\left(0\right)}\left(2i\right)\\ d^{\left(1\right)}\left(i\right)=c^{\left(0\right)}(2i+1)\end{array}\right.,i=\mathrm{0,1},...,M_{\mathrm{symb}}^{\mathrm{layer}}-1---\left(1\right)$

Wherein

the data amount check of one deck,

it is the data amount check of data flow before layering.

2, the layer mapping of spatial reuse is as follows for different code stream numbers and the concrete mapping of the number of plies:

If code stream number is identical with the number of plies, be 1 or 2:

$\left\{\begin{array}{c}{d}^{\left(0\right)}\left(i\right)=c^{\left(0\right)}\left(i\right)\\ d^{\left(1\right)}\left(i\right)=c^{\left(1\right)}\left(i\right)\end{array}\right.,i=\mathrm{0,1},...,M_{\mathrm{symb}}^{\mathrm{layer}}-1---\left(2\right)$

Wherein $M_{\mathrm{symb}}^{\mathrm{layer}}=M_{\mathrm{symb}}^{\left(0\right)}.$

If code stream number is 1 number of plies is 2:

$\left\{\begin{array}{c}{d}^{\left(0\right)}\left(i\right)=c^{\left(0\right)}\left(2i\right)\\ d^{\left(1\right)}\left(i\right)=c^{\left(0\right)}(2i+1)\end{array}\right.,i=\mathrm{0,1},...,M_{\mathrm{symb}}^{\mathrm{layer}}-1---\left(3\right)$

Wherein $M_{\mathrm{symb}}^{\mathrm{layer}}=M_{\mathrm{symb}}^{\left(0\right)}/2.$

Step S106, precoding.Particularly, by the data d after layering ⁽⁰⁾..., d ^(V-1)carry out the precoding processing of transmit diversity or spatial reuse according to the channel information of feedback.When transmit diversity, the number of plies equals antenna port number; When spatial reuse, the number of plies is not more than antenna port number.

1, for the transmit diversity of 2 antenna ports, in the time that reality is implemented, can realize Space Frequency Block Coding (SFBC, Space Frequency Block Coding) transmit diversity, the output of precoding $e\left(i\right)={\left[e^{\left(0\right)}\left(i\right)e^{\left(1\right)}\left(i\right)\right]}^T(i=\mathrm{0,1},...,M_{\mathrm{symb}}^{\mathrm{ap}}-1)$ Be defined as:

$\left[\begin{array}{c}{e}^{\left(0\right)}\left(2i\right)\\ e^{\left(1\right)}\left(2i\right)\\ e^{\left(0\right)}(2i+1)\\ e^{\left(1\right)}(2i+1)\end{array}\right]=\frac{1}{\sqrt{2}}\left[\begin{array}{cccc}1& 0& \mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA00002285551100021.png,HDA00002285551100031.png"\; state="\{\{state\}\}">j</figure-callout>}& 0\\ 0& -1& 0& \mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA00002285551100021.png,HDA00002285551100031.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 0& 1& 0& \mathrm{<figure-callout\; id="1"\; label="j"\; filenames="HDA00002285551100021.png,HDA00002285551100031.png"\; state="\{\{state\}\}">j</figure-callout>}\\ 1& 0& -\mathrm{<figure-callout\; id="0"\; label="j"\; filenames="HDA00002285551100021.png,HDA00002285551100031.png"\; state="\{\{state\}\}">j</figure-callout>}& 0\end{array}\right]\left[\begin{array}{c}\mathrm{Re}\left(d^{\left(0\right)}\left(i\right)\right)\\ \mathrm{Re}\left(d^{\left(1\right)}\left(i\right)\right)\\ \mathrm{Im}\left(d^{\left(0\right)}\left(i\right)\right)\\ \mathrm{Im}\left(d^{\left(1\right)}\left(i\right)\right)\end{array}\right]---\left(4\right)$

Wherein i=0,1 ...,

$M_{\mathrm{symb}}^{\mathrm{ap}}=2M_{\mathrm{symb}}^{\mathrm{layer}}.$

Carrying out SFBC when coding, the selection of subcarrier pair has two kinds of modes: one be in each elementary cell in pairs; One be according to elementary cell to carrying out, the namely allocation unit when as SFBC take two elementary cells, the subcarrier in two elementary cells is corresponding one by one.

2, the precoding of spatial reuse comprises two kinds: without cyclic delay diversity (CDD, Cyclic Delay Diversity) precoding and the precoding based on CDD.

A) without CDD precoding: the PMI/RI that base station reports based on UE service conditions or other outer shroud control informations in conjunction with CQI and UE judge the pre-coding matrix W (i) that should use in downlink transfer, and the precoding of spatial reuse is defined as:

$\left[\begin{array}{c}{e}^{\left(0\right)}\left(i\right)\\ e^{\left(1\right)}\left(i\right)\\ ...\\ e^{(M-1)}\left(i\right)\end{array}\right]=W\left(i\right)\left[\begin{array}{c}{d}^{\left(0\right)}\left(i\right)\\ d^{\left(1\right)}\left(i\right)\\ ...\\ d^{(V-1)}\left(i\right)\end{array}\right]---\left(5\right)$

Pre-coding matrix W (i) size is MxV, and M is antenna port number, and V is the number of plies, and i=0,1 ...,

the concrete form of W (i) is in table 1, and table 1 is the pre-coding matrix of two aerial space multiplexings.

Table 1

B) precoding based on CDD: in the time that down channel situation of change can not accurately be followed the tracks of in base station, need to increase by CDD the frequency selectivity of equivalent channel, the precoding based on CDD is defined as:

$\left[\begin{array}{c}{e}^{\left(0\right)}\left(i\right)\\ e^{\left(1\right)}\left(i\right)\\ ...\\ e^{(M-1)}\left(i\right)\end{array}\right]=\mathrm{WDU}\left[\begin{array}{c}{d}^{\left(0\right)}\left(i\right)\\ d^{\left(1\right)}\left(i\right)\\ ...\\ d^{(V-1)}\left(i\right)\end{array}\right]---\left(6\right)$

U matrix can make each layer data mix, and equivalent channel quality that can balanced two code words, and D matrix is realized long time delay CDD, and W, D, U matrix are as follows respectively:

$W=\left[\begin{array}{cc}1& 0\\ 0& 1\end{array}\right]---\left(7\right)$

$D=\left[\begin{array}{cc}1& 0\\ 0& e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA00002285551100021.png,HDA00002285551100031.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}/2}\end{array}\right]---\left(8\right)$

$U=\frac{1}{\sqrt{2}}\left[\begin{array}{cc}1& 1\\ 1& e^{-\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="HDA00002285551100021.png,HDA00002285551100031.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;}/2}\end{array}\right]---\left(9\right)$

It should be noted that, the pre-coding matrix relating in execution step S106 comprises the modes such as Open-Loop Spatial Multiplexing, Closed-Loop Spatial Multiplexing, transmit diversity, and the channel relevancy between dual-mode antenna is depended in concrete selection.Channel relevancy information comprises channel quality indication (CQI), channel sequence indication (RI), pre-coding matrix code indication (PMI) etc., and obtaining of these information can obtain from receiving terminal feedback, also can obtain according to time-multiplexed up-downgoing symmetry.

Step S107, pilots insertion and subcarrier mapping.Particularly, by the data e after precoding ⁽⁰⁾..., e ^(M-1)insert respectively pilot tone and carry out physical sub-carrier mapping according to antenna port sequence number.

Consult Fig. 2, in Fig. 2, symbol 4 and symbol 5 are respectively the pilot frequency locations of two antenna ports, symbol 4 respective antenna ports 0, and symbol 5 respective antenna port ones, all subcarriers on symbol 4 and symbol 5 are pilot tone.By the pilot settings mode of this antenna port, make receiving terminal in carrying out channel estimating, can reduce the complexity of channel estimating, effectively improve precision of channel estimation.It should be noted that, in the present embodiment, the pilot frequency locations that symbol 4 and symbol 5 are made as respectively to two antenna ports, only for illustrating, in other embodiments, also can be made as other symbols the pilot frequency locations of antenna port.In addition, in the present embodiment, when the symbolic number in an elementary cell in system resource allocation is 8, and when the number of transmitting antenna is 2, generally the symbol mediating is made as to the pilot frequency locations of antenna port, for example symbol 2 is to symbol 5, and first symbol in an elementary cell and last symbol are approaching with the time delay of middle symbol like this, and the channel information of pilot frequency locations can be good at representing the channel situation in whole elementary cell.

System bandwidth is the integral multiple of 1MHz, elementary cell is carried out take 1MHz bandwidth as unit to the mapping of physical sub-carrier, has 128 physical sub-carriers, in the present embodiment in 1MHz bandwidth, in an elementary cell frequency domain, comprise 8 subcarriers, corresponding 16 elementary cells.

In the time that subcarrier shines upon, can take normally used mapping mode in prior art.Fig. 4 is that the one of subcarrier mapping is implemented schematic diagram, refer to Fig. 4, right side 0 in Fig. 4, 1, 2, 3 15, what represent is the sequence number of physical sub-carrier, in Fig. 4, left side 0 ~ 7 represents the sequence number of an elementary cell sub-carriers, in Fig. 4, show altogether the subcarrier mapping situation of two elementary cells, the subcarrier of first elementary cell is mapped as the sequence number 0 ~ 7 of elementary cell sub-carriers sequence number 0 ~ 7 corresponding physical sub-carrier, the subcarrier of the second elementary cell is mapped as the sequence number 8 ~ 15 of elementary cell sub-carriers sequence number 0 ~ 7 corresponding physical sub-carrier, by that analogy, the sequence number of elementary cell is corresponding with the sequence number of physical sub-carrier successively in order.

In the present embodiment, the subcarrier mapping mode of taking is different from prior art.Fig. 5 is that the another kind of subcarrier mapping is implemented schematic diagram, consult Fig. 5, in Fig. 5, also show the subcarrier mapping situation of two elementary cells, first elementary cell sub-carriers sequence number 0 ~ 7 sequence number 0,16,32,48,64,80,96,112 of corresponding physical sub-carrier respectively, the sequence number 1,17,33,49,65,81,97,113 of 0 ~ 7 corresponding physical sub-carrier of difference of second elementary cell sub-carriers sequence number, by that analogy, 8 subcarriers in an elementary cell are evenly distributed in 128 physical sub-carriers.In the time that reality is implemented, if carry out respectively subcarrier mapping according to multiple 1MHz bandwidth when band is wider than 1MHz, such carrier wave mapping mode has been broken up the Data Position in elementary cell, has played the effect interweaving, and has the effect of good frequency diversity.

Fig. 6 is another enforcement schematic diagram of subcarrier mapping.As shown in Figure 6, in Fig. 6, also show the subcarrier mapping situation of two elementary cells, first elementary cell sub-carriers sequence number 0 ~ 7 sequence number 0,2,32,34,64,66,96,98 of corresponding physical sub-carrier respectively, the sequence number 1,3,33,35,65,67,97,99 of 0 ~ 7 corresponding physical sub-carrier of difference of second elementary cell sub-carriers sequence number, by that analogy.

Fig. 4, Fig. 5 and Fig. 6 are three sub-carrier mapping modes, compared with the mapping mode of Fig. 4, Fig. 5 and Fig. 6 expand to the resource of an elementary cell in one section of system bandwidth according to certain rule, avoid one section of continuous physical subcarrier in the time of decline, to affect the situation of one section of continuous data, the impact of contrary frequency selectivity decline preferably.

The mapping formula that Fig. 5 is corresponding is:

l=16*m+n （10）

The mapping formula that Fig. 6 is corresponding is:

L in above-mentioned (10), (11) two formulas is the sequence number of physical sub-carrier in 1MHz bandwidth, is 0 ..., 127; M is a subcarrier sequence number in elementary cell, is 0 ..., 7; N is the sequence number of elementary cell, and in 1MHz bandwidth, sequence number is 0 ..., 15.

Please continue to refer to Fig. 4, step S108, IFFT conversion and CP insert.Particularly, respectively the data of each antenna port are carried out to serial to parallel conversion, and carry out IFFT conversion by data transformation to time domain, then add Cyclic Prefix data framing, finally by the base band time domain signal x of framing ⁽⁰⁾..., x ^(M-1)exporting transmitting antenna to sends.

It should be noted that, in the present embodiment, can also be after the constellation mapping operation of step S103 and before the frequency domain code of step S104 expands operation, or after the frequency domain code of step S104 expands operation and before layer map operation of step S105, each sub data flow is carried out to randomization operation.Randomization operation is signal to be carried out on subcarrier to scrambling operation, makes the signal between different districts have more randomness, for expecting community, has white noise.In addition, in other embodiments, the bit scramble operation of step S101 also can be carried out after the chnnel coding of step S102 is processed and before the operation of the constellation mapping of step S103, and the frequency domain code of step S104 expands also and can after the layer map operation of step S105 and before the precoding processing of step S106, carry out.

Corresponding to the signaling method of above-mentioned communication system, the present embodiment also provides a kind of sender unit of communication system.Fig. 7 is the structural representation of the sender unit of embodiment of the present invention communication system, as shown in Figure 7, the sender unit of described communication system comprises: coded modulation unit 10, be suitable for according to channel information, and carry out respectively chnnel coding and constellation mapping to sent every way data flow; The first processing unit 20, is connected with described coded modulation unit 10, is suitable for carrying out spread spectrum operation and multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping; OFDM modulating unit 30, be connected with described the first processing unit 20, be suitable for the sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing to carry out OFDM modulation, and send outputing to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation.

In concrete enforcement, described the first processing unit comprises the first spectrum-spreading unit and the first multiple-input, multiple-output transmission processing unit; Described the first spectrum-spreading unit, is suitable for, based on spread spectrum parameter, the sub data flow of process chnnel coding and constellation mapping is carried out to spread spectrum operation, and described spread spectrum parameter at least comprises spreading factor and subcode road number; Described the first multiple-input, multiple-output transmission processing unit, be suitable for the sub data flow after described spread spectrum operation to carry out multiple-input, multiple-output transmission processing, described the first multiple-input, multiple-output transmission processing unit comprises: first layer map unit, be suitable for the sub data flow after described spread spectrum operation to carry out layered mapping the layer mapping of the layer mapping that described layered mapping is single antenna, the layer mapping of transmit diversity or spatial reuse; The first precoding processing unit, is suitable for the sub data flow after layered mapping to carry out corresponding precoding processing.

The sender unit of described communication system also comprises the first randomization unit, be suitable for after chnnel coding and constellation mapping and spread spectrum operation before, or after spread spectrum operation and before multiple-input, multiple-output transmission processing, every way data flow is carried out to randomization operation.

In another concrete enforcement, described the first processing unit comprises the second multiple-input, multiple-output transmission processing unit and the second spectrum-spreading unit; Described the second multiple-input, multiple-output transmission processing unit, is suitable for carrying out multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping; Described the second multiple-input, multiple-output transmission processing unit comprises: the second layered mapping unit, is suitable for carrying out layered mapping through the sub data flow of described chnnel coding and constellation mapping; The second precoding processing unit, is suitable for the sub data flow after layered mapping to carry out corresponding precoding processing; Described the second spectrum-spreading unit, is suitable for the sub data flow after to described multiple-input, multiple-output transmission processing based on spread spectrum parameter and carries out spread spectrum operation, and described spread spectrum parameter at least comprises spreading factor and subcode road number.

The sender unit of described communication system also comprises the second randomization unit, be suitable for after chnnel coding and constellation mapping and before multiple-input, multiple-output transmission processing, or after spread spectrum operation and before OFDM modulation, every way data flow is carried out to randomization operation.

Described OFDM modulating unit comprises: an OFDM modulation subunit, is suitable for the sub data flow after described spread spectrum operation and multiple-input, multiple-output transmission processing to insert respectively the frequency pilot sign of respective antenna port and be mapped to corresponding physical sub-carrier; The 2nd OFDM modulation subunit, carries out serial to parallel conversion to the sub data flow of each antenna port respectively, and carries out inverse fast Fourier transform, inserts Cyclic Prefix and output to transmitting antenna and send so that OFDM symbol is formed to physical frame.

In the present embodiment, a described OFDM modulation subunit is inserted the frequency pilot sign of respective antenna port and is mapped to each physical sub-carrier at identical character position.

In the present embodiment, described coded modulation unit comprises scrambling unit, is suitable for before chnnel coding, or after chnnel coding and before constellation mapping, every way data flow is carried out to scrambling operation.

It should be noted that, in the time that reality is implemented, the sender unit of described communication system can comprise transmitting element, is connected with described OFDM modulating unit, be suitable for that described OFDM modulating unit is passed to the baseband signal of coming and carry out frequency up-conversion operation, wireless transmission after power amplification.Transmitting antenna is included among described transmitting element, and described transmitting element can be multiple independently transmitting antennas, can be also smart antenna array.

Corresponding to the signaling method of above-mentioned communication system, embodiment of the present invention also provides a kind of signal acceptance method of communication system.Fig. 8 is the schematic flow sheet of the signal acceptance method of the communication system that provides of embodiment of the present invention.As shown in Figure 8, the signal acceptance method of described communication system comprises:

Step S4, the baseband signal that each reception antenna is received is carried out OFDM demodulation;

Step S5, will carry out multiple-input, multiple-output reception & disposal and separate spread spectrum operation through the frequency domain data obtaining after OFDM demodulation;

Step S6, by separating constellation mapping and channel decoding through the sub data flow of multiple-input, multiple-output reception & disposal and the operation of solution spread spectrum, obtains target data.

In the specific implementation, step S4 can comprise:

Step S41, in the baseband signal receiving at each reception antenna respectively, extract OFDM symbol data streams, remove the Cyclic Prefix in OFDM symbol data streams and carry out fast Fourier transform (FFT, Fast Fourier Transform), obtaining the frequency domain data of each physical sub-carrier;

Step S42, carries out extracting pilot data after subcarrier demapping to the frequency domain data of each physical sub-carrier.

Step S5 can have two kinds of implementations, and a kind of implementation is first to carry out multiple-input, multiple-output reception & disposal then to separate spread spectrum operation, and another kind of implementation is first to carry out despreading operation frequently then to carry out multiple-input, multiple-output reception & disposal.

The first implementation of step S5 specifically can comprise:

Step S51, to carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation, described multiple-input, multiple-output reception & disposal comprises: the described pilot data extracting is carried out to channel estimating; Sending mode according to communication system is chosen pre-coding matrix; Result based on channel estimating and the pre-coding matrix of choosing carry out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; The each layered data flows solution layer mapping obtaining after equilibrium treatment returned to each sub data flow;

Step S52, to separating spread spectrum operation through each sub data flow of separating layer mapping recovery.

The second implementation of step S5 specifically can comprise:

Step S53, to separating spread spectrum operation through the frequency domain data obtaining after OFDM demodulation;

Step S54, to carrying out multiple-input, multiple-output reception & disposal through the data of separating after spread spectrum operation, described multiple-input, multiple-output reception & disposal comprises: the described pilot data extracting is carried out to channel estimating, choose pre-coding matrix according to the sending mode of communication system; Result based on channel estimating and the pre-coding matrix of choosing carry out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; The layered data flows solution layer mapping obtaining after equilibrium treatment returned to sub data flow.

With specific embodiment, the signal acceptance method of above-mentioned communication system is described below.

The flow process of the signal acceptance method of the communication system that the present embodiment provides is as shown in Figure 9:

Step S201, symbol goes CP and FFT conversion.Particularly, the base band data y that timing is arrived M antenna reception respectively according to system synchronization ⁽⁰⁾..., y ^(M-1)remove CP, and carry out FFT conversion data are converted to frequency domain.

Step S202, subcarrier demapping and pilot extraction.Particularly, according to user's resource allocation information, the data flow of M antenna is carried out to physical sub-carrier demapping, extract pilot data.Subcarrier is mapped with two kinds of modes, sees respectively Fig. 5 and Fig. 6, carries out corresponding demapping processing according to the mapping mode arranging.

Step S203, channel estimating.Particularly, the channel impulse response of each reception antenna is carried out to channel estimating, obtain channel characteristics information, as shown in Figure 2, each subcarrier has pilot data to pilots insertion, has reduced the complexity of channel estimating, has improved estimated accuracy.

Step S204, carrier wave equilibrium.Particularly, determine it is transmit diversity or spatial multiplexing mode according to the system sending mode obtaining, select corresponding pre-coding matrix, adopt least mean-square error (MMSE, Minimum Mean Squared Error) or other equalization algorithms each physical sub-carrier data are carried out to equilibrium treatment, eliminate spacial influence and obtain the data flow of V layer

If diversity mode, two continuous elementary cells are that an elementary unit groups is carried out SFBC coding, and two subcarriers that carry out like this SFBC in elementary unit groups are adjacent on physical sub-carrier.The initial elementary cell sequence number of elementary unit groups is even number, and the physical sub-carrier mapping of elementary unit groups can be with reference to figure 5 and Fig. 6.

Step S205, separates layer mapping.Particularly, layer data stream is separated to layer mapping, return to Nr data flow

Step S206, frequency domain decoding is expanded.Particularly, to flowing through each layer data of separating after layer mapping

decode and expand operation (separating spread spectrum operation), obtain Nr data flow

can effectively suppress co-channel interference by step S206.

Step S207, separates constellation mapping.This step is the demodulation process of carrying out before channel decoding, particularly, and to Nr data flow

separate respectively constellation mapping according to its constellation mapping pattern.

Step S208, channel decoding.Particularly, to carrying out respectively decoded operation through Nr the data flow of separating after constellation mapping according to its coded system.

Step S209, bit descrambling.Particularly, if transmitting terminal has carried out scrambling processing to data,, respectively to the Nr obtaining after channel decoding data flow descrambling, recover original transmission information

described original transmission information is the target data described in step S6.

It should be noted that, corresponding with randomization operation, in signal reception & disposal, can also comprise solution randomization operation, before described solution randomization operation can and be separated spread spectrum operation after separating layer mapping, or after separating spread spectrum operation and before separating constellation mapping.

Due to the signal acceptance method of the communication system inverse process that is signaling method, enforcement that can reference signal sending method about the concrete enforcement of signal acceptance method, is not described in detail at this.

Corresponding to the signal acceptance method of above-mentioned communication system, the present embodiment also provides a kind of signal receiving device of communication system.Figure 10 is the structural representation of the signal receiving device of embodiment of the present invention communication system, and as shown in figure 10, the signal receiving device of described communication system comprises: OFDM demodulating unit 40, and the baseband signal that is suitable for each reception antenna to receive is carried out OFDM demodulation; The second processing unit 50, is connected with described OFDM demodulating unit 40, is suitable for carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation and separating spread spectrum operation; Demodulation coding unit 60, is connected with described the second processing unit 50, is suitable for, by separating constellation mapping and channel decoding through the sub data flow of multiple-input, multiple-output reception & disposal and the operation of solution spread spectrum, obtaining target data.

Described OFDM demodulating unit comprises: an OFDM demodulation subelement, in the baseband signal that is suitable for receiving at each reception antenna respectively, extract OFDM symbol data streams, remove the Cyclic Prefix in OFDM symbol data streams and carry out fast Fourier transform, obtaining the frequency domain data of each physical sub-carrier; The 2nd OFDM demodulation subelement, is suitable for the frequency domain data of each physical sub-carrier to carry out extracting pilot data after subcarrier demapping.

In the time of concrete enforcement, described the second processing unit comprises the first multiple-input, multiple-output reception & disposal unit and the first solution spectrum-spreading unit; Described the first multiple-input, multiple-output reception & disposal unit, be suitable for carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation, described the first multiple-input, multiple-output reception & disposal unit comprises: the first channel estimating unit, and the described pilot data being suitable for extracting carries out channel estimating; First chooses unit, is suitable for choosing pre-coding matrix according to the sending mode of communication system; The first equilibrium treatment unit, is suitable for the result based on channel estimating and the pre-coding matrix chosen carries out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; First separates layer map unit, and the each layered data flows solution layer mapping being suitable for obtaining after equilibrium treatment returns to each sub data flow; Described first separates spectrum-spreading unit, is suitable for separating spread spectrum operation through separating layer each sub data flow that mapping recovers.

In the time of another concrete enforcement, described the second processing unit comprises the second solution spectrum-spreading unit and the second multiple-input, multiple-output reception & disposal unit; Described second separates spectrum-spreading unit, is suitable for separate spread spectrum operation through the frequency domain data obtaining after OFDM demodulation; Described the second multiple-input, multiple-output reception & disposal unit, be suitable for carrying out multiple-input, multiple-output reception & disposal through the data of separating after spread spectrum operation, described the second multiple-input, multiple-output reception & disposal unit comprises: second channel estimation unit, and the described pilot data being suitable for extracting carries out channel estimating; Second chooses unit, is suitable for choosing pre-coding matrix according to the sending mode of communication system; The second equilibrium treatment unit, is suitable for the result based on channel estimating and the pre-coding matrix chosen carries out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; Second separates layer map unit, and the layered data flows solution layer mapping being suitable for obtaining after equilibrium treatment returns to sub data flow.

It should be noted that, in the time that reality is implemented, the signal receiving device of described communication system can comprise receiving element, is connected with described OFDM demodulating unit, the radiofrequency signal that is suitable for receiving for reception antenna is carried out down-conversion operation, produces baseband signal and exports to OFDM demodulating unit.Reception antenna can be included among described receiving element, and described receiving element can be multiple independently reception antennas, can be also smart antenna array.

The concrete enforcement of the signal receiving device of described communication system can, with reference to the enforcement of the signal acceptance method of communication system, not repeat them here.

Embodiment of the present invention also provides a kind of communication system that comprises above-mentioned sender unit and signal receiving device.With specific embodiment, described communication system is described below.

Figure 11 is the schematic diagram of the communication system that provides of the embodiment of the present invention, as shown in figure 11, the communication system that the present embodiment provides is a kind of communication system of multiple-input, multiple-output code spread orthogonal frequency division multiplexing, and this communication system comprises above-mentioned sender unit and signal receiving device.In actual conditions, can think and comprise the base station of above-mentioned sender unit and comprise that the terminal of above-mentioned signal receiving device forms described communication system, also can think and comprise the terminal of above-mentioned sender unit and comprise that the base station of above-mentioned signal receiving device forms described communication system, can also think and comprise that the base station of above-mentioned sender unit and signal receiving device or terminal form described communication system.

As a rule, base station and terminal all can comprise above-mentioned sender unit and signal receiving device.Base station and terminal (UE, User Equipment) are processed similar, include signal transmission processing and signal reception & disposal two parts in base station and terminal, correspond respectively to the function that sender unit and signal receiving device are realized.Communication system shown in Figure 11, can be base station or the terminal that comprises sender unit and signal receiving device when actual enforcement, and the included receiving element of the transmitting element that sender unit is included and signal receiving device can be combined into antenna element.Signal transmission processing part: select the send modes such as spatial reuse, transmit diversity or single antenna transmission according to channel information.After determining the send mode that spatial reuse, transmit diversity or single antenna send, multichannel original data stream is carried out to the operations such as coded modulation, spread spectrum, MIMO transmission processing, OFDM modulation by coded modulation unit, the first spectrum-spreading unit, a MIMO transmission processing unit, OFDM modulating unit respectively, the data after framing are delivered to antenna element through up-conversion, power control wireless transmission afterwards; Signal reception & disposal part: antenna element carries out down-converted for the wireless signal receiving and is transformed into baseband signal, and separate spectrum-spreading unit, demodulation coding unit according to parameters such as antenna number, send modes by described OFDM demodulating unit, a MIMO reception & disposal unit, first and respectively baseband signal is carried out OFDM demodulation, MIMO reception & disposal, separated the operations such as spread spectrum, demodulation coding, recover the raw information sending.Above-mentioned the first spectrum-spreading unit and a MIMO transmission processing unit are contained in foregoing the first processing unit, and a MIMO reception & disposal unit, first is separated spectrum-spreading unit and is contained in foregoing the second processing unit.

B shown in Figure 11 ₀b _nt-1represent original Nt to be sent road original data stream and s ₀s _nt-1, c ₀c _nt-1, e ₀e _m-1, X ₀x _m-1what represent respectively is the data flow obtaining after described coded modulation unit, the first spectrum-spreading unit, a MIMO transmission processing unit, OFDM modulating unit are processed; Y ₀y _m-1represent the M road wireless signal receiving, and f ₀f _m-1, c ₀c _nr-1, s ₀s _nr-1, b ₀b _nr-1what represent respectively is to separate through described OFDM demodulating unit, a MIMO reception & disposal unit, first data flow obtaining after spectrum-spreading unit, demodulation coding cell processing.

Described in the present embodiment, the concrete enforcement of communication system can, with reference to the sending method of above-mentioned signal and device, the method for reseptance of signal and the enforcement of device, not repeat them here.

The multiple-input, multiple-output code spread orthogonal frequency division multiplexing system that embodiment of the present invention proposes combines CDMA, OFDM and MIMO technology, combine the advantage of several technology, adopt OFDM technology to improve the availability of frequency spectrum, reduce receiver equalization complexity, adopt the effective contrary frequency selectivity decline of CDMA technology and co-frequency neighbor cell to disturb, MIMO technology utilizes space multiplexing technique effectively to improve the transmission rate of system, this system can well adapt to mobile and fixed environment, carry out preferably identical networking, there is larger system transmission rate.Technical solution of the present invention combines the technology such as OFDM, MIMO, CDMA and adaptive coding and modulating, makes communication system have the ability of high stability, high-throughput and identical networking.

It will be appreciated by those skilled in the art that, communication system and all or part of of sender unit and signal receiving device thereof of realizing in above-described embodiment are can carry out the hardware that instruction is relevant by program to complete, described program can be stored in computer-readable recording medium, and described storage medium can be ROM, RAM, magnetic disc, CD etc.

Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible variation and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.

Claims (27)

1. a signaling method for communication system, is characterized in that, comprising:

According to channel information, carry out respectively chnnel coding and constellation mapping to sent every way data flow;

To carrying out spread spectrum operation and multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping;

Sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing is carried out to OFDM modulation, and send outputing to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation.

2. the signaling method of communication system according to claim 1, is characterized in that, the described sub data flow to process chnnel coding and constellation mapping carries out spread spectrum operation and multiple-input, multiple-output transmission processing comprises:

Based on spread spectrum parameter, to carrying out spread spectrum operation through the sub data flow of chnnel coding and constellation mapping, described spread spectrum parameter at least comprises spreading factor and subcode road number;

Sub data flow after described spread spectrum operation is carried out to multiple-input, multiple-output transmission processing, described multiple-input, multiple-output transmission processing comprises: the sub data flow after described spread spectrum operation is carried out to layered mapping, the layer mapping of the layer mapping that described layered mapping is single antenna, the layer mapping of transmit diversity or spatial reuse; Sub data flow after layered mapping is carried out to corresponding precoding processing.

3. the signaling method of communication system according to claim 2, it is characterized in that, also comprise: after chnnel coding and constellation mapping and before spread spectrum operation, or after spread spectrum operation and before multiple-input, multiple-output transmission processing, every way data flow is carried out to randomization operation.

4. the signaling method of communication system according to claim 1, is characterized in that, the described sub data flow to process chnnel coding and constellation mapping carries out spread spectrum operation and multiple-input, multiple-output transmission processing comprises:

To carrying out multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping, described multiple-input, multiple-output transmission processing comprises: will carry out layered mapping through the sub data flow of described chnnel coding and constellation mapping, and the sub data flow after layered mapping is carried out to corresponding precoding processing;

Sub data flow based on spread spectrum parameter after to described multiple-input, multiple-output transmission processing carries out spread spectrum operation, and described spread spectrum parameter at least comprises spreading factor and subcode road number.

5. the signaling method of communication system according to claim 4, it is characterized in that, also comprise: after chnnel coding and constellation mapping and before multiple-input, multiple-output transmission processing, or after spread spectrum operation and before OFDM modulation, every way data flow is carried out to randomization operation.

6. according to the signaling method of the communication system described in claim 2 or 4, it is characterized in that, the subcode road number while carrying out described spread spectrum operation is less than or equal to spreading factor.

7. the signaling method of communication system according to claim 1, it is characterized in that, described sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing is carried out to OFDM modulation, and sends and comprise outputed to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation:

Sub data flow after described spread spectrum operation and multiple-input, multiple-output transmission processing is inserted respectively to the frequency pilot sign of respective antenna port and is mapped to corresponding physical sub-carrier;

Respectively the sub data flow of each antenna port is carried out to serial to parallel conversion, and carry out inverse fast Fourier transform, insert Cyclic Prefix and output to transmitting antenna and send so that OFDM symbol is formed to physical frame.

8. the signaling method of communication system according to claim 7, it is characterized in that, described sub data flow after the operation of described spread spectrum and multiple-input, multiple-output transmission processing is inserted respectively to the frequency pilot sign of respective antenna port and is mapped to corresponding physical sub-carrier comprise: insert the frequency pilot sign of respective antenna port and be mapped to each physical sub-carrier at identical character position.

9. the signaling method of communication system according to claim 1, is characterized in that, also comprises: before chnnel coding, or after chnnel coding and before constellation mapping, every way data flow is carried out to scrambling operation.

10. the signaling method of communication system according to claim 1, is characterized in that, described channel information comprises at least one in channel quality indication, channel sequence indication and the indication of pre-coding matrix code.

The sender unit of 11. 1 kinds of communication systems, is characterized in that, comprising:

Coded modulation unit, is suitable for according to channel information, carries out respectively chnnel coding and constellation mapping to sent every way data flow;

The first processing unit, is suitable for carrying out spread spectrum operation and multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping;

OFDM modulating unit, is suitable for the sub data flow after spread spectrum operation and multiple-input, multiple-output transmission processing to carry out OFDM modulation, and sends outputing to transmitting antenna by the OFDM symbol data streams obtaining after OFDM modulation.

The sender unit of 12. communication systems according to claim 11, is characterized in that, described the first processing unit comprises the first spectrum-spreading unit and the first multiple-input, multiple-output transmission processing unit;

Described the first spectrum-spreading unit, is suitable for, based on spread spectrum parameter, the sub data flow of process chnnel coding and constellation mapping is carried out to spread spectrum operation, and described spread spectrum parameter at least comprises spreading factor and subcode road number;

Described the first multiple-input, multiple-output transmission processing unit, be suitable for the sub data flow after described spread spectrum operation to carry out multiple-input, multiple-output transmission processing, described the first multiple-input, multiple-output transmission processing unit comprises: first layer map unit, be suitable for the sub data flow after described spread spectrum operation to carry out layered mapping the layer mapping of the layer mapping that described layered mapping is single antenna, the layer mapping of transmit diversity or spatial reuse; The first precoding processing unit, is suitable for the sub data flow after layered mapping to carry out corresponding precoding processing.

The sender unit of 13. communication systems according to claim 12, it is characterized in that, also comprise the first randomization unit, be suitable for after chnnel coding and constellation mapping and spread spectrum operation before, or after spread spectrum operation and before multiple-input, multiple-output transmission processing, every way data flow is carried out to randomization operation.

The sender unit of 14. communication systems according to claim 11, is characterized in that, described the first processing unit comprises the second multiple-input, multiple-output transmission processing unit and the second spectrum-spreading unit;

Described the second multiple-input, multiple-output transmission processing unit, is suitable for carrying out multiple-input, multiple-output transmission processing through the sub data flow of chnnel coding and constellation mapping; Described the second multiple-input, multiple-output transmission processing unit comprises: the second layered mapping unit, is suitable for carrying out layered mapping through the sub data flow of described chnnel coding and constellation mapping; The second precoding processing unit, is suitable for the sub data flow after layered mapping to carry out corresponding precoding processing;

Described the second spectrum-spreading unit, is suitable for the sub data flow after to described multiple-input, multiple-output transmission processing based on spread spectrum parameter and carries out spread spectrum operation, and described spread spectrum parameter at least comprises spreading factor and subcode road number.

The sender unit of 15. communication systems according to claim 14, it is characterized in that, also comprise: the second randomization unit, be suitable for after chnnel coding and constellation mapping and before multiple-input, multiple-output transmission processing, or after spread spectrum operation and before OFDM modulation, every way data flow is carried out to randomization operation.

The sender unit of 16. communication systems according to claim 11, is characterized in that, described OFDM modulating unit comprises:

The one OFDM modulation subunit, is suitable for the sub data flow after described spread spectrum operation and multiple-input, multiple-output transmission processing to insert respectively the frequency pilot sign of respective antenna port and be mapped to corresponding physical sub-carrier;

The 2nd OFDM modulation subunit, carries out serial to parallel conversion to the sub data flow of each antenna port respectively, and carries out inverse fast Fourier transform, inserts Cyclic Prefix and output to transmitting antenna and send so that OFDM symbol is formed to physical frame.

The sender unit of 17. communication systems according to claim 16, is characterized in that, a described OFDM modulation subunit is inserted the frequency pilot sign of respective antenna port and is mapped to each physical sub-carrier at identical character position.

The sender unit of 18. communication systems according to claim 11, it is characterized in that, described coded modulation unit comprises scrambling unit, is suitable for before chnnel coding, or after chnnel coding and before constellation mapping, every way data flow is carried out to scrambling operation.

The signal acceptance method of 19. 1 kinds of communication systems, is characterized in that, comprising:

The baseband signal that each reception antenna is received is carried out OFDM demodulation;

To carry out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation and separate spread spectrum operation;

By separating constellation mapping and channel decoding through the sub data flow of multiple-input, multiple-output reception & disposal and the operation of solution spread spectrum, obtain target data.

The signal acceptance method of 20. communication systems according to claim 19, is characterized in that, the described baseband signal that each reception antenna is received is carried out OFDM demodulation and comprised:

In the baseband signal receiving at each reception antenna respectively, extract OFDM symbol data streams, remove the Cyclic Prefix in OFDM symbol data streams and carry out fast Fourier transform, obtain the frequency domain data of each physical sub-carrier;

The frequency domain data of each physical sub-carrier is carried out extracting pilot data after subcarrier demapping.

The signal acceptance method of 21. communication systems according to claim 20, is characterized in that, the described frequency domain data that process OFDM demodulation is obtained afterwards carries out multiple-input, multiple-output reception & disposal and separate spread spectrum operation comprising:

To carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation, described multiple-input, multiple-output reception & disposal comprises: the described pilot data extracting is carried out to channel estimating; Sending mode according to communication system is chosen pre-coding matrix; Result based on channel estimating and the pre-coding matrix of choosing carry out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; The each layered data flows solution layer mapping obtaining after equilibrium treatment returned to each sub data flow;

To separating spread spectrum operation through each sub data flow of separating layer mapping recovery.

The signal acceptance method of 22. communication systems according to claim 20, is characterized in that, the described frequency domain data that process OFDM demodulation is obtained afterwards carries out multiple-input, multiple-output reception & disposal and separate spread spectrum operation comprising:

To separate spread spectrum operation through the frequency domain data obtaining after OFDM demodulation;

To carrying out multiple-input, multiple-output reception & disposal through the data of separating after spread spectrum operation, described multiple-input, multiple-output reception & disposal comprises: the described pilot data extracting is carried out to channel estimating, choose pre-coding matrix according to the sending mode of communication system; Result based on channel estimating and the pre-coding matrix of choosing carry out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; The layered data flows solution layer mapping obtaining after equilibrium treatment returned to sub data flow.

The signal receiving device of 23. 1 kinds of communication systems, is characterized in that, comprising:

OFDM demodulating unit, the baseband signal that is suitable for each reception antenna to receive is carried out OFDM demodulation;

The second processing unit, is suitable for carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation and separating spread spectrum operation;

Demodulation coding unit, is suitable for, by separating constellation mapping and channel decoding through the sub data flow of multiple-input, multiple-output reception & disposal and the operation of solution spread spectrum, obtaining target data.

The signal receiving device of 24. communication systems according to claim 23, is characterized in that, described OFDM demodulating unit comprises:

The one OFDM demodulation subelement, extracts OFDM symbol data streams in the baseband signal that is suitable for receiving at each reception antenna respectively, removes the Cyclic Prefix in OFDM symbol data streams and carries out fast Fourier transform, obtains the frequency domain data of each physical sub-carrier;

The 2nd OFDM demodulation subelement, is suitable for the frequency domain data of each physical sub-carrier to carry out extracting pilot data after subcarrier demapping.

The signal receiving device of 25. communication systems according to claim 24, is characterized in that, described the second processing unit comprises the first multiple-input, multiple-output reception & disposal unit and the first solution spectrum-spreading unit;

Described the first multiple-input, multiple-output reception & disposal unit, be suitable for carrying out multiple-input, multiple-output reception & disposal through the frequency domain data obtaining after OFDM demodulation, described the first multiple-input, multiple-output reception & disposal unit comprises: the first channel estimating unit, and the described pilot data being suitable for extracting carries out channel estimating; First chooses unit, is suitable for choosing pre-coding matrix according to the sending mode of communication system; The first equilibrium treatment unit, is suitable for the result based on channel estimating and the pre-coding matrix chosen carries out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; First separates layer map unit, and the each layered data flows solution layer mapping being suitable for obtaining after equilibrium treatment returns to each sub data flow;

Described first separates spectrum-spreading unit, is suitable for separating spread spectrum operation through separating layer each sub data flow that mapping recovers.

The signal receiving device of 26. communication systems according to claim 24, is characterized in that, described the second processing unit comprises the second solution spectrum-spreading unit and the second multiple-input, multiple-output reception & disposal unit;

Described second separates spectrum-spreading unit, is suitable for separate spread spectrum operation through the frequency domain data obtaining after OFDM demodulation;

Described the second multiple-input, multiple-output reception & disposal unit, be suitable for carrying out multiple-input, multiple-output reception & disposal through the data of separating after spread spectrum operation, described the second multiple-input, multiple-output reception & disposal unit comprises: second channel estimation unit, and the described pilot data being suitable for extracting carries out channel estimating; Second chooses unit, is suitable for choosing pre-coding matrix according to the sending mode of communication system; The second equilibrium treatment unit, is suitable for the result based on channel estimating and the pre-coding matrix chosen carries out equilibrium treatment to the frequency domain data of the each physical sub-carrier receiving; Second separates layer map unit, and the layered data flows solution layer mapping being suitable for obtaining after equilibrium treatment returns to sub data flow.

27. 1 kinds of communication systems, is characterized in that, comprising: the signal receiving device described in the sender unit described in claim 11 to 18 any one and claim 23 to 26 any one.

Images