CN103780528B - Communication system and its signaling method and device, signal acceptance method and device - Google Patents

Communication system and its signaling method and device, signal acceptance method and device Download PDF

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CN103780528B
CN103780528B CN201210403296.2A CN201210403296A CN103780528B CN 103780528 B CN103780528 B CN 103780528B CN 201210403296 A CN201210403296 A CN 201210403296A CN 103780528 B CN103780528 B CN 103780528B
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communication system
spread spectrum
mapping
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CN103780528A (en
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闫发军
董霄剑
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Abstract

A kind of communication system and its signaling method and device, signal acceptance method and device, sender unit include:Coded modulation unit, first processing units and OFDM modulating units, suitable for according to channel information, it is respectively channel encoded to sent every sub-data stream and is modulated with constellation mapping, spread spectrum and multiple-input, multiple-output transmission processing, OFDM, and the OFDM symbol data stream that will be obtained afterwards by OFDM modulation is output to transmitting antenna and is transmitted;The signal receiving device includes:OFDM demodulation unit, second processing unit and demodulation decoding unit, the baseband signal suitable for being received to each reception antenna carry out OFDM demodulation, multiple-input, multiple-output reception processing and despread, solve constellation mapping and channel decoding respectively, obtain target data.Technical solution of the present invention can be effective against the interference of frequency selective fading and co-frequency neighbor cell, the ability for making communication system have high stability, high-throughput and identical networking.

Description

Communication system and its signaling method and device, signal acceptance method and device
Technical field
The present invention relates to the communications field, more particularly to a kind of communication system, the signaling method and device of communication system With the signal acceptance method and device of communication system.
Background technology
OFDM(OFDM, Orthogonal Frequency Division Multiplexing)Technology utilizes Orthogonality between each subcarrier, it is allowed to which the frequency spectrum of subchannel is overlapped, effectively increases the availability of frequency spectrum.Pass through data The serial to parallel conversion of stream, the data symbol duration on each subcarrier greatly increases, and the addition of cyclic prefix, effectively drop Low intersymbol interference(ISI, Inter Symbol Interference).Because each subcarrier bandwidth is narrower, can be directed to Each subcarrier carries out equalization operation, enormously simplify the complexity of receiver.OFDM technology is in 3G Long Term Evolution (LTE, Long Term Evolution)System and WLAN(WLAN, Wireless Local Area Networks) It is widely applied in system.But interference of the OFDM technology for co-frequency neighbor cell does not have defensive ability/resistance ability substantially, it is difficult to real Existing identical networking.
Multiple-input, multiple-output(MIMO, Multiple-Input Multiple-Output)Technology refers in transmitting terminal and reception End, respectively using multiple transmitting antennas and reception antenna.Its basic thought is in transmitting, received using multiple antennas, passes through sky When treatment technology, make full use of the autonomous behavior between channel, improve the availability of frequency spectrum, communication quality and power system capacity.MIMO Technology makes full use of the independent radio channels between transmitting and reception, and transmitting antenna sends out multiple different data flows in receiving terminal Apparently all there is differentiable spatial character, therefore can regard as and be believed by the parallel son of minimum number of antennas in the antenna of both ends Road forms, and the capacity of whole mimo channel is exactly the sum of all subchannel capacities.
The communication system of multi-input multi-output-orthogonal frequency-division multiplexing of the prior art, two kinds of technologies of OFDM and MIMO are combined, The availability of frequency spectrum can be improved, reduces receiver equalization complexity, and the transmission rate of system can be effectively improved.It is however, existing MIMO-OFDM systems are difficult to the interference for being effective against frequency selective fading and co-frequency neighbor cell.
Correlation technique reference may also be made to Publication No. US2006067420 (A1) U.S. Patent application, the patent application publication A kind of MIMO OFDM mobile communication system and channel estimation methods.
The content of the invention
The problem to be solved in the present invention is that MIMO-OFDM systems of the prior art are difficult to be effective against frequency selectivity Decline and the interference of co-frequency neighbor cell.
To solve the above problems, technical solution of the present invention provides a kind of signaling method of communication system, including:
According to channel information, it is respectively channel encoded to sent every sub-data stream and constellation mapping;
Spread spectrum operation and multiple-input, multiple-output transmission processing are carried out to the sub-data flow by channel coding and constellation mapping;
OFDM modulation is carried out to the sub-data flow after spread spectrum operation and multiple-input, multiple-output transmission processing, and will be by OFDM The OFDM symbol data stream that modulation obtains afterwards is output to transmitting antenna and is transmitted.
Optionally, the described pair of sub-data flow after spread spectrum operation and multiple-input, multiple-output transmission processing carries out OFDM tune System, and by by the OFDM symbol data stream that obtains afterwards of OFDM modulation be output to transmitting antenna be transmitted including:
Sub-data flow after the spread spectrum operation and multiple-input, multiple-output transmission processing is inserted into respective antenna port respectively Frequency pilot sign and be mapped to corresponding physical sub-carrier;
Serial to parallel conversion is carried out to the sub-data flow of each antenna port respectively, and carries out inverse fast Fourier transform, insert and follow Ring prefix is transmitted so that OFDM symbol formation physical frame is output into transmitting antenna.
Optionally, the sub-data flow by after the spread spectrum operation and multiple-input, multiple-output transmission processing inserts phase respectively Answering the frequency pilot sign of antenna port and being mapped to corresponding physical sub-carrier includes:Respective antenna is inserted in identical character position The frequency pilot sign of port is simultaneously mapped to each physical sub-carrier.
To solve the above problems, technical solution of the present invention also provides a kind of sender unit of communication system, including:
Coded modulation unit, suitable for according to channel information, being respectively channel encoded to sent every sub-data stream And constellation mapping;
First processing units, suitable for carrying out spread spectrum operation and more to the sub-data flow by channel coding and constellation mapping Enter to have more transmission processing;
OFDM modulating units, suitable for being carried out to the sub-data flow after spread spectrum operation and multiple-input, multiple-output transmission processing OFDM is modulated, and the OFDM symbol data stream obtained afterwards by OFDM modulation is output into transmitting antenna and is transmitted.
To solve the above problems, technical solution of the present invention also provides a kind of signal acceptance method of communication system, including:
The baseband signal received to each reception antenna carries out OFDM demodulation;
Multiple-input, multiple-output reception processing will be carried out by the frequency domain data obtained after OFDM demodulation and despread operation;
By multiple-input, multiple-output reception processing and the sub-data flow of operation will be despread carry out solving constellation mapping and channel and translate Code, obtain target data.
To solve the above problems, technical solution of the present invention also provides a kind of signal receiving device of communication system, including:
OFDM demodulation unit, the baseband signal suitable for being received to each reception antenna carry out OFDM demodulation;
Second processing unit, suitable for multiple-input, multiple-output reception processing will be carried out by the frequency domain data obtained after OFDM demodulation And despread operation;
Demodulation coding unit, suitable for by multiple-input, multiple-output reception processing and the sub-data flow of operation being despread being solved Constellation mapping and channel decoding, obtain target data.
To solve the above problems, technical solution of the present invention also provides, one kind includes above-mentioned sender unit and signal receives The communication system of device.
Compared with prior art, technical solution of the present invention at least has advantages below:
By the way that spread spectrum is organically applied in MIMO-OFDM communication system, easily operated spread spectrum and solution are designed Expand coefficient, and be that unit carries out spread spectrum operation to each symbol in each elementary cell, when co-channel interference be present, solution amplification Benefit can preferably suppress co-channel interference, so as to be effective against the dry of frequency selective fading and co-frequency neighbor cell Disturb, the ability for making the communication system that there is high stability, high-throughput and identical networking.
By inserting the frequency pilot sign of respective antenna port in identical character position and being mapped to each physical sub-carrier, Each physical sub-carrier on any antenna port is had pilot data, reduce the complexity of channel estimation, improve and estimate Count precision.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the signaling method for the communication system that embodiment of the present invention provides;
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 a kind of of subcarrier maps implements schematic diagram;
Fig. 5 is that the another of subcarrier maps implements schematic diagram;
Fig. 6 is another implementation schematic diagram of subcarrier maps;
Fig. 7 is the structural representation of the sender unit of communication system of the embodiment of the present invention;
Fig. 8 is the schematic flow sheet of the signal acceptance method for the communication system that embodiment of the present invention provides;
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 communication system of the embodiment of the present invention;
Figure 11 is the schematic diagram of communication system provided in an embodiment of the present invention.
Embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention Embodiment be described in detail.Detail is elaborated in the following description in order to fully understand the present invention.But It is that the present invention can be different from other manner described here to implement with a variety of, those skilled in the art can be without prejudice to originally Similar popularization is done in the case of invention intension.Therefore the present invention is not limited by following public embodiment.
In the MIMO-OFDM systems of prior art, typically gone for co-frequency neighbor cell interference using the method for scheduling of resource Solve, that is, distribute the user in cell edge to different frequency domain resources to avoid co-channel interference, but this method meeting The scheduling complexity of increase system, therefore still it is difficult to be effective against the dry of frequency selective fading and co-frequency neighbor cell Disturb.Inventor is it is considered that CDMA(CDMA, Code Division Multiple Access)Technology has very strong anti-letter Number decline and the ability of adjacent cell interference, are advantageous to identical networking, but if CDMA uplink code channel is asynchronous, or more In the case of the serious interference of footpath, the orthogonality of code channel is just destroyed, it is necessary to which it is extensive to carry out signal using multiuser detection technology It is multiple, but in user excessively and in the case of multipath complexity, the performance of joint-detection can also decline, and multiuser detection technology With the increase computing volume index increase of number of users, the complexity of realization is significantly increased, therefore is not suitable for broadband application.
Based on above-mentioned analysis, embodiment of the present invention is provided a method that, CDMA technology is organically applied into MIMO- In ofdm system, identical physical resource can be distributed to different user in neighbor cell, by expanding the data of frequency domain Frequency is handled, and suppresses co-channel interference using the orthogonality between different code words.The scheduling that such method simplifies system is complicated Degree, and co-channel interference can be suppressed well.
It should be noted that because CDMA technology is generally used for time domain, realized by RAKE receiver or joint-detection more The diversity reception in footpath, and in technical solution of the present invention, CDMA technology is applied to frequency domain, utilizes the orthogonality and spread spectrum of code word The spreading gain that brings suppresses frequency domain interference, this be not those skilled in the art be easy for it is thinkable.
Fig. 1 is the schematic flow sheet of the signaling method for the communication system that embodiment of the present invention provides.Such as Fig. 1 institutes Show, the signaling method of the communication system includes:
Step S1, according to channel information, it is respectively channel encoded to sent every sub-data stream and constellation mapping;
Step S2, spread spectrum operation is carried out to the sub-data flow by channel coding and constellation mapping and multiple-input, multiple-output are sent Processing;
Step S3, OFDM modulation is carried out to the sub-data flow after spread spectrum operation and multiple-input, multiple-output transmission processing, and The OFDM symbol data stream obtained afterwards by OFDM modulation is output into transmitting antenna to be transmitted.
When it is implemented, the channel information described in step S1 indicates including channel quality(CQI, Channel Quality Indication), channel order instruction(RI, Rank Indication), pre-coding matrix code instruction(PMI, Precoding Matrix Indicator)At least one of.The acquisition of above-mentioned channel information can be fed back to obtain from receiving terminal, can also be Transmitting terminal obtains according to time-multiplexed up-downgoing symmetry.
Step S2 can have two kinds of implementations, and one kind, which is achieved in that, first to be carried out spread spectrum operation and then carry out multiple-input, multiple-output Transmission is handled, and another kind is achieved in that first carrying out multiple-input, multiple-output sends processing and then carry out spread spectrum operation.
Step S2 the first implementation can specifically include:
Step S21, spread spectrum operation, institute are carried out to the sub-data flow by channel coding and constellation mapping based on spread spectrum parameter State spread spectrum parameter and comprise at least spreading factor and subcode road number;
Step S22, carries out multiple-input, multiple-output transmission processing to the sub-data flow after the spread spectrum operation, it is described enter it is more Going out transmission processing includes:Sub-data flow after the spread spectrum operation is subjected to layered mapping, the layered mapping is single antenna Layer mapping, the layer mapping of transmitting diversity or the layer mapping of spatial reuse;Sub-data flow after layered mapping is carried out corresponding pre- Coded treatment.
When step S2 uses the first implementation, in channel coding and constellation mapping(That is step S1)Afterwards and spread spectrum is grasped Make(That is step S21)Before, or in spread spectrum operation(That is step S21)Afterwards and multiple-input, multiple-output transmission is handled(That is step S22) Before, randomization operation can also be carried out to every sub-data stream.
Step S2 second of implementation can specifically include:
Step S23, multiple-input, multiple-output transmission processing is carried out to the sub-data flow by channel coding and constellation mapping, it is described more Entering to have more transmission processing includes:Sub-data flow by the channel coding and constellation mapping is subjected to layered mapping, and to dividing Sub-data flow after layer mapping carries out corresponding precoding processing;
Step S24, the sub-data flow after being handled based on spread spectrum parameter the multiple-input, multiple-output transmission carry out spread spectrum operation, institute State spread spectrum parameter and comprise at least spreading factor and subcode road number.
When step S2 uses second of implementation, in channel coding and constellation mapping(That is step S1)Afterwards and enter more more Go out transmission processing(That is step S23)Before, or in spread spectrum operation(That is step S24)Afterwards and OFDM is modulated(That is step S3)It Before, randomization operation can also be carried out to every sub-data stream.
In the specific implementation, either step S21 or step S23, the subcode road number during spread spectrum operation is carried out Less than or equal to spreading factor.
Step S3 can include:
Step S31, the sub-data flow after the spread spectrum operation and multiple-input, multiple-output transmission processing is inserted accordingly respectively The frequency pilot sign of antenna port is simultaneously mapped to corresponding physical sub-carrier;
Step S32, serial to parallel conversion is carried out to the sub-data flow of each antenna port respectively, and carry out inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform), insertion cyclic prefix(CP, Cyclic Prefx)So that OFDM to be accorded with Number forming physical frame is output to transmitting antenna and is transmitted.
Wherein, step S31 in the specific implementation, the frequency pilot sign of respective antenna port is inserted simultaneously in identical character position It is mapped to each physical sub-carrier.For the pilot settings mode of such a antenna port, the specific embodiment that will be given below In be further described.
In the specific implementation, the signaling method of described communication system can also include:Before channel coding, or Person carries out Scrambling Operation after the channel encoding and before constellation mapping, to every sub-data stream.
The signaling method of above-mentioned communication system is elaborated with specific embodiment below.
The elementary cell in system resource allocation is briefly described first.Fig. 2 is one in system resource allocation The schematic diagram of elementary cell, as shown in Fig. 2 the elementary cell of communication system is time-frequency two-dimensional unit, transverse axis is time domain, this implementation Example includes 8 symbols, and the longitudinal axis is frequency domain, and the present embodiment includes 8 subcarriers, and a symbol intervals are 137.5 μ s, sub- load Wave spacing is 7.8125KHz, and the resource allocation of system is all as base unit.
The flow of the signaling method for the communication system that the present embodiment provides is as shown in Figure 3:
Step S101, bit scramble.Specifically, to Nt data flow b(0)..., b(Nt-1)Scrambling processing is carried out respectively, with Reach the purpose for distinguishing base station.
Step S102, channel coding.Specifically, the data flow after Nt scrambling is respectively channel encoded, it is described Channel coding can be Read-Solomon(RS)Coding, convolutional encoding, Turbo codings or low-density checksum coding (LDPC, Low Density Parity Check Code)Deng.
Step S103, constellation mapping.Specifically, constellation mapping is carried out respectively to the data flow after Nt channel coding, This step is the modulation treatment that carries out afterwards of coding, and the mode of modulation can be BPSK, QPSK, 8PSK, 16QAM, 64QAM etc., The modulation sequence of output is s(0)..., s(Nt-1)
Step S104, frequency domain code expand.Specifically, the factor is expanded according to code respectively(Spreading factor)With subcode road number to Nt Data flow after modulation carries out code and expands operation(Spread spectrum operation), the code expansion factor is no more than one in system resource allocation The subcarrier number of elementary cell, subcode road number expand the factor no more than the code.The factor 8, subcode road number 4 are expanded with code Exemplified by come description code expansion processing.Code expands processing to be carried out according to formula c=WS, whereinIt is modulation Continuous four data afterwards, W=[w0,w1,w2,w3], w0、w1、w2And w3It is that code expands the factor as 8 four code words, length 8, c It is exactly the data of 8 subcarriers of correspondence after code expansion is handled.
It should be noted that considering for the complexity of realization, the spread spectrum operation in the present embodiment is based on a sub-channels In a symbol on 8 subcarriers carry out, can so reach using spread it is more to Cochannel interference, while only Increase implementation complexity.
Step S105, layer mapping.Specifically, to multiple data flow c(0)..., c(Nt-1)Carry out layer mapping, data flow number For Nt no more than the number of plies V being layered, number of plies V is not more than antenna number M, and layer mapping is divided into layer mapping and the spatial reuse of transmitting diversity Layer mapping.In the embodiment of the present invention, illustrated so that transmission antenna is 2 as an example.
1st, a code stream is only transmitted during transmitting diversity, number of plies V is equal to the antenna port number M of physical channel transmission.Namely By code stream uniform mapping to M layers, the mapping such as formula of 2 antenna ports(1)It is shown:
Wherein It is one layer of data amount check,It is the number of data flow before being layered According to number.
2nd, the layer mapping of spatial reuse specifically maps as follows for different code stream numbers and the number of plies:
It is 1 or 2 if code stream number is identical with the number of plies:
Wherein
If code stream number is that 1 number of plies is 2:
Wherein
Step S106, precoding.Specifically, by the data d after layering(0)..., d(V-1)According to the channel information of feedback Carry out transmitting diversity or the precoding processing of spatial reuse.During transmitting diversity, the number of plies is equal to antenna port number;During spatial reuse, The number of plies is not more than antenna port number.
1st, for the transmitting diversity of 2 antenna ports, when actually implementing, it is possible to achieve Space Frequency Block Coding(SFBC, Space Frequency Block Coding)Transmitting diversity, the output of precoding It is defined as:
Wherein i=0,1 ...,
When carrying out SFBC codings, the selection of subcarrier pair has two ways:One kind be in each elementary cell two-by-two In pairs;One kind be according to elementary cell to carry out, that is, with two elementary cells to for SFBC when allocation unit, two bases Subcarrier in this unit corresponds.
2nd, the precoding of spatial reuse includes two kinds:Without cyclic delay diversity(CDD, Cyclic Delay Diversity) Precoding and the precoding based on CDD.
A) without CDD precodings:Base station based on the UE PMI/RI reported and combine CQI and UE service conditions or other outside Ring control information judges the pre-coding matrix W (i) that should be used in downlink transfer, and the precoding of spatial reuse is defined as:
Pre-coding matrix W (i) sizes are MxV, and M is antenna port number, and V is the number of plies, and i=0,1 ..., W (i) concrete form is shown in Table 1, and table 1 is the pre-coding matrix of two aerial space multiplexings.
Table 1
B) precoding based on CDD:When base station can not accurately track down channel situation of change, it is necessary to be increased by CDD Add the frequency selectivity of equivalent channel, the precoding based on CDD is defined as:
U matrixes can mix each layer data, and be capable of the equivalent channel quality of balanced two code words, and D matrix is realized big Time delay CDD, W, D, U matrix difference are as follows:
It should be noted that performing the pre-coding matrix being related in step S106 includes Open-Loop Spatial Multiplexing, closed loop space The modes such as multiplexing, transmitting diversity, the specifically chosen channel relevancy depended between dual-mode antenna.Channel correlation information includes letter Road quality instruction(CQI), channel order instruction(RI), pre-coding matrix code instruction(PMI)Acquisition Deng, these information can be from connecing Receiving end is fed back to obtain, and can also be obtained according to time-multiplexed up-downgoing symmetry.
Step S107, pilot tone insertion and subcarrier maps.Specifically, by the data e after precoding(0)..., e(M-1)Root Pilot tone is inserted respectively according to antenna port sequence number and carries out physical sub-carrier mapping.
Refering to Fig. 2, symbol 4 and symbol 5 are the pilot frequency locations of two antenna ports respectively in Fig. 2, the respective antenna end of symbol 4 Mouthful 0, the respective antenna port 1 of symbol 5, all subcarriers on symbol 4 and symbol 5 are pilot tone.Pass through this antenna port Pilot settings mode, receiving terminal is set to reduce the complexity of channel estimation when channel estimation is carried out, effectively improve letter Road estimated accuracy.It should be noted that in the present embodiment, symbol 4 and symbol 5 are set to the pilot bit of two antenna ports Put by way of example only, in other embodiments, other symbols can also be set to the pilot frequency locations of antenna port.In addition, this In embodiment, when the symbolic number in an elementary cell in system resource allocation is 8, and the number of transmitting antenna is 2 When, symbol in an intermediate position is typically set to the pilot frequency locations of antenna port, such as symbol 2 to symbol 5, so at one The time delay of first symbol and last symbol and the symbol of centre in elementary cell approaches, the channel information of pilot frequency locations It can be good at representing the channel situation in whole elementary cell.
System bandwidth is 1MHz integral multiple, and the mapping of elementary cell to physical sub-carrier is entered in units of 1MHz bandwidth OK, there are 128 physical sub-carriers in 1MHz bandwidth, in the present embodiment, 8 subcarriers included in an elementary cell frequency domain, Corresponding 16 elementary cells.
In subcarrier maps, mapping mode usually used in the prior art can be taken.Fig. 4 is subcarrier maps One kind implement schematic diagram, referring to Fig. 4, in Fig. 4 right side 0,1,2,3 ..., 15 ... expressions be physical sub-carrier sequence number, Fig. 4 Middle left side 0 ~ 7 represents the sequence number of an elementary cell sub-carriers, shows that the subcarrier of two elementary cells reflects altogether in Fig. 4 Situation is penetrated, the subcarrier maps of first elementary cell correspond to the sequence of physical sub-carrier for elementary cell sub-carriers sequence number 0 ~ 7 Number 0 ~ 7, the subcarrier maps of the second elementary cell for the corresponding physical sub-carrier of elementary cell sub-carriers sequence number 0 ~ 7 sequence number 8 ~ 15, by that analogy, the sequence number of elementary cell is corresponding with the sequence number of physical sub-carrier successively in sequence.
In the present embodiment, the subcarrier maps mode taken is different from prior art.Fig. 5 is the another kind of subcarrier maps Implement schematic diagram, refering to Fig. 5, be also shown for the subcarrier maps situation of two elementary cells in Fig. 5, in first elementary cell Subcarrier sequence number 0 ~ 7 corresponds to the sequence number 0,16,32,48,64,80,96,112 of physical sub-carrier respectively, in second elementary cell The sequence number 1,17,33,49,65,81,97,113 that subcarrier sequence number 0 ~ 7 corresponds to physical sub-carrier respectively, by that analogy, by one 8 subcarriers in individual elementary cell are evenly distributed in 128 physical sub-carriers.When actually implementing, if band is wider than Subcarrier maps are then carried out respectively according to multiple 1MHz bandwidth during 1MHz, and such carrier wave mapping mode has been broken up in elementary cell Data Position, serve the effect of intertexture, the effect for having preferable frequency diversity.
Fig. 6 is another implementation schematic diagram of subcarrier maps.As shown in fig. 6, two elementary cells are also shown in Fig. 6 Subcarrier maps situation, first elementary cell sub-carriers sequence number 0 ~ 7 correspond to respectively physical sub-carrier sequence number 0,2,32, 34th, 64,66,96,98, sequence number 1 that second elementary cell sub-carriers sequence number 0 ~ 7 corresponds to physical sub-carrier respectively, 3,33, 35th, 65,67,97,99, by that analogy.
Fig. 4, Fig. 5 and Fig. 6 are three sub-carrier mapping modes, and compared with Fig. 4 mapping mode, Fig. 5 and Fig. 6 are by one The resource of elementary cell is expanded in one section of system bandwidth according to certain rule, is avoided one section of continuous physical subcarrier and is in The situation of one section of continuous data, the influence of energy preferably contrary frequency Selective intensity are influenceed during decline.
Mapping equation is corresponding to Fig. 5:
l=16*m+n (10)
Mapping equation is corresponding to Fig. 6:
It is above-mentioned(10)、(11)L in two formulas is the sequence number of physical sub-carrier in 1MHz bandwidth, is 0 ..., 127;M is one Subcarrier sequence number in individual elementary cell, it is 0 ..., 7;N is the sequence number of elementary cell, in 1MHz bandwidth serial number 0 ..., 15。
Please continue to refer to Fig. 4, step S108, IFFT conversion and CP insertions.Specifically, respectively to the number of each antenna port According to progress serial to parallel conversion, and carry out IFFT conversion and transform the data into time domain, then add cyclic prefix data and framing, finally By the base band time domain signal x of framing(0)..., x(M-1)Output to transmitting antenna is transmitted.
, can also be after step S103 constellation mapping operation and step S104 it should be noted that in the present embodiment Frequency domain code expand operation before, or step S104 frequency domain code expand operation after and step S105 layer map operation it Before, randomization operation is carried out to each sub-data flow.Randomization operation is to carry out a Scrambling Operation on sub-carriers to signal, is made The signal obtained between different districts has more randomness, for it is expected there is white noise for cell.In addition, in other embodiment In, the operation of step S101 bit scramble can also be after step S102 channel coding processing and step S103 constellation reflects Carry out before penetrating operation, step S104 frequency domain code expands can also be after step S105 layer map operation and step S106 Carried out before precoding processing.
Corresponding to the signaling method of above-mentioned communication system, the signal that the present embodiment also provides a kind of communication system is sent Device.Fig. 7 is the structural representation of the sender unit of communication system of the embodiment of the present invention, as shown in fig. 7, the communication system The sender unit of system includes:Coded modulation unit 10, suitable for according to channel information, to sent every sub-data flow point Carry out not channel coding and constellation mapping;First processing units 20, it is connected with the coded modulation unit 10, suitable for by believing Road encodes and the sub-data flow of constellation mapping carries out spread spectrum operation and multiple-input, multiple-output transmission processing;OFDM modulating units 30, with The first processing units 20 are connected, suitable for being carried out to the sub-data flow after spread spectrum operation and multiple-input, multiple-output transmission processing OFDM is modulated, and the OFDM symbol data stream obtained afterwards by OFDM modulation is output into transmitting antenna and is transmitted.
In a specific implementation, the first processing units include the first spectrum-spreading unit and the first multiple-input, multiple-output transmission is handled Unit;First spectrum-spreading unit, suitable for being carried out based on spread spectrum parameter to the sub-data flow by channel coding and constellation mapping Spread spectrum operation, the spread spectrum parameter comprise at least spreading factor and subcode road number;It is single that first multiple-input, multiple-output send processing Member, suitable for carrying out multiple-input, multiple-output transmission processing, the first multiple-input, multiple-output hair to the sub-data flow after the spread spectrum operation Processing unit is sent to include:First layer map unit, suitable for the sub-data flow after the spread spectrum operation is carried out into layered mapping, institute State the layer mapping, the layer mapping of transmitting diversity or the layer mapping of spatial reuse that layered mapping is single antenna;First precoding processing Unit, suitable for carrying out corresponding precoding processing to the sub-data flow after layered mapping.
The sender unit of described communication system also includes the first randomization unit, suitable in channel coding and constellation After mapping and before spread spectrum operation, or after spread spectrum operation and before multiple-input, multiple-output transmission processing, to every sub-data Stream carries out randomization operation.
In another specific implementation, the first processing units include the second multiple-input, multiple-output and send processing unit and the second expansion Frequency unit;Second multiple-input, multiple-output send processing unit, suitable for being flowed into the subdata by channel coding and constellation mapping Row multiple-input, multiple-output transmission is handled;Second multiple-input, multiple-output, which send processing unit, to be included:Second layered mapping unit, suitable for will be through The sub-data flow for crossing the channel coding and constellation mapping carries out layered mapping;Second precoding processing unit, suitable for layering Sub-data flow after mapping carries out corresponding precoding processing;Second spectrum-spreading unit, suitable for based on spread spectrum parameter to described Sub-data flow after multiple-input, multiple-output transmission processing carries out spread spectrum operation, and the spread spectrum parameter comprises at least spreading factor and subcode road Number.
The sender unit of described communication system also includes the second randomization unit, suitable in channel coding and constellation After mapping and before multiple-input, multiple-output transmission processing, or after spread spectrum operation and before OFDM modulation, to every sub-data Stream carries out randomization operation.
The OFDM modulating units include:First OFDM modulation subunits, suitable for by the spread spectrum operation and more enter it is more The sub-data flow gone out after transmission is handled inserts the frequency pilot sign of respective antenna port and is mapped to corresponding physics and carries respectively Ripple;2nd OFDM modulation subunits, serial to parallel conversion is carried out to the sub-data flow of each antenna port respectively, and carry out fast Fourier Inverse transformation, insertion cyclic prefix are transmitted so that OFDM symbol formation physical frame is output into transmitting antenna.
In the present embodiment, the first OFDM modulation subunits are led identical character position insertion respective antenna port Frequency symbol is simultaneously mapped to each physical sub-carrier.
In the present embodiment, the coded modulation unit includes scrambling unit, suitable for before channel coding, or in channel After coding and before constellation mapping, Scrambling Operation is carried out to every sub-data stream.
It should be noted that when actually implementing, the sender unit of described communication system can include sending list Member, it is connected with the OFDM modulating units, the baseband signal suitable for being transmitted through coming to the OFDM modulating units carries out up-conversion behaviour Make, transmitted wirelessly after power amplification.Transmitting antenna is included among the transmitting element, and the transmitting element can be multiple Independent transmitting antenna or smart antenna array.
Corresponding to the signaling method of above-mentioned communication system, embodiment of the present invention also provides a kind of letter of communication system Number method of reseptance.Fig. 8 is the schematic flow sheet of the signal acceptance method for the communication system that embodiment of the present invention provides.Such as Fig. 8 Shown, the signal acceptance method of the communication system includes:
Step S4, the baseband signal received to each reception antenna carry out OFDM demodulation;
Step S5, multiple-input, multiple-output reception processing will be carried out by the frequency domain data obtained after OFDM demodulation and despread Operation;
Step S6, by by multiple-input, multiple-output reception processing and despread operation sub-data flow carry out solve constellation mapping and Channel decoding, obtain target data.
In the specific implementation, step S4 can include:
Step S41, OFDM symbol data stream is extracted in the baseband signal that each reception antenna receives respectively, remove OFDM Cyclic prefix in symbol data streams simultaneously carries out Fast Fourier Transform (FFT)(FFT, Fast Fourier Transform), obtain each The frequency domain data of physical sub-carrier;
Step S42, to extracting pilot data after the frequency domain data progress subcarrier demapping of each physical sub-carrier.
Step S5 can have two kinds of implementations, and one kind, which is achieved in that, first to be carried out multiple-input, multiple-output reception processing and then carry out Operation is despread, another kind, which is achieved in that, first to carry out despreading operation and then carry out multiple-input, multiple-output reception processing.
Step S5 the first implementation can specifically include:
Step S51, multiple-input, multiple-output reception processing is carried out to the frequency domain data by being obtained after OFDM demodulation, it is described to enter more Having more reception processing includes:Channel estimation is carried out to the pilot data of extraction;Chosen according to the sending mode of communication system Pre-coding matrix;The pre-coding matrix of result and selection based on channel estimation is to the frequency domain of each physical sub-carrier received Data carry out equilibrium treatment;Each layered data flows solution layer mapping obtained after equilibrium treatment is recovered to each sub-data flow;
Step S52, each sub-data flow recovered by solution layer mapping is carried out despreading operation.
Step S5 second of implementation can specifically include:
Step S53, the frequency domain data by obtaining after OFDM demodulation is carried out despreading operation;
Data after despreading operation are carried out multiple-input, multiple-output reception processing by step S54, and the multiple-input, multiple-output receive Processing includes:Channel estimation is carried out to the pilot data of extraction, precoding square is chosen according to the sending mode of communication system Battle array;The frequency domain data of each physical sub-carrier of the pre-coding matrix of result and selection based on channel estimation to receiving is carried out Equilibrium treatment;The layered data flows solution layer mapping obtained after equilibrium treatment is recovered to sub-data flow.
The signal acceptance method of above-mentioned communication system is illustrated with specific embodiment below.
The flow of the signal acceptance method for the communication system that the present embodiment provides is as shown in Figure 9:
Step S201, symbol remove CP and FFT.Specifically, M antenna is received respectively according to system synchronization timing Base band data y(0),...,y(M-1)CP is removed, and carries out FFT and data is converted to frequency domain.
Step S202, subcarrier demapping and pilot extraction.Specifically, according to the resource allocation information of user to M day The data flow of line carries out physical sub-carrier demapping, extracts pilot data.Subcarrier maps have two ways, see respectively Fig. 5 and Fig. 6, the demapping processing according to corresponding to being carried out the mapping mode of setting.
Step S203, channel estimation.Specifically, channel estimation is carried out to the channel impulse response of each reception antenna, obtained Take channel characteristic information, pilot tone insertion reduces the complexity of channel estimation as shown in Fig. 2 each subcarrier has pilot data Degree, improves estimated accuracy.
Step S204, carrier equalisation.Specifically, determine it is transmitting diversity or space according to the system sending mode of acquisition Multiplex mode, pre-coding matrix corresponding to selection, using least mean-square error(MMSE, Minimum Mean Squared Error)Or other equalization algorithms carry out equilibrium treatment to each physical sub-carrier data, eliminate spacial influence and obtain the number of V layers According to stream
If diversity mode, two continuous elementary cells are that an elementary unit groups carry out SFBC codings, this Two subcarriers that SFBC is carried out in sample elementary unit groups are adjacent on physical sub-carrier.The starting elementary cell of elementary unit groups Sequence number is even number, and the physical sub-carrier mapping of elementary unit groups may be referred to Fig. 5 and Fig. 6.
Step S205, solution layer mapping.Specifically, layer data stream solution layer is mapped, recovered to Nr data flow
Step S206, frequency domain decoding are expanded.Specifically, to each layer data stream after solution layer mapping Enter Operation is expanded in row decoding(Despread operation), obtain Nr data flow Can effectively it be suppressed by step S206 Co-channel interference.
Step S207, solve constellation mapping.This step is the demodulation process carried out before channel decoding, specifically, to Nr Individual data flow Solution constellation mapping is carried out according to its constellation mapping pattern respectively.
Step S208, channel decoding.Specifically, to the Nr data flow after solving constellation mapping according to its coded system Decoded operation is carried out respectively.
Step S209, bit descrambling.Specifically, if transmitting terminal has carried out scrambling processing to data, channel is translated respectively The Nr data flow descrambling obtained after code, recovers original transmission information The original transmission information is Target data described in step S6.
It should be noted that it is corresponding with randomization operation, solution randomization behaviour can also be included in signal reception processing Make, the solution randomization operation can after solution layer mapping and before despreading operation, or after operation is despread and Before solution constellation mapping.
Due to the inverse process that the signal acceptance method of communication system is signaling method, the tool on signal acceptance method Body is implemented to may be referred to the implementation of signaling method, is not described in detail herein.
Corresponding to the signal acceptance method of above-mentioned communication system, the signal that the present embodiment also provides a kind of communication system receives Device.Figure 10 is the structural representation of the signal receiving device of communication system of the embodiment of the present invention, as shown in Figure 10, the communication The signal receiving device of system includes:OFDM demodulation unit 40, the baseband signal suitable for being received to each reception antenna are carried out OFDM demodulation;Second processing unit 50, it is connected with the OFDM demodulation unit 40, suitable for will pass through after OFDM demodulation what is obtained Frequency domain data carries out multiple-input, multiple-output reception processing and despreads operation;Demodulation coding unit 60, with the second processing unit 50 are connected, suitable for by multiple-input, multiple-output reception processing and will despread the sub-data flow of operation and carry out solving constellation mapping and channel Decoding, obtain target data.
The OFDM demodulation unit includes:First OFDM demodulation subelement, suitable for what is received respectively in each reception antenna OFDM symbol data stream is extracted in baseband signal, the cyclic prefix in OFDM symbol data stream is removed and carries out fast Fourier change Change, obtain the frequency domain data of each physical sub-carrier;Second OFDM demodulation subelement, suitable for the frequency domain data to each physical sub-carrier Pilot data is extracted after carrying out subcarrier demapping.
One when it is implemented, the second processing unit includes the first multiple-input, multiple-output reception processing unit and the first despreading Frequency unit;The first multiple-input, multiple-output reception processing unit, suitable for being carried out to the frequency domain data by being obtained after OFDM demodulation Multiple-input, multiple-output reception processing, the first multiple-input, multiple-output reception processing unit include:First channel estimating unit, suitable for extraction The pilot data carry out channel estimation;First chooses unit, suitable for choosing precoding according to the sending mode of communication system Matrix;First equilibrium treatment unit, it is each to what is received suitable for the result based on channel estimation and the pre-coding matrix of selection The frequency domain data of physical sub-carrier carries out equilibrium treatment;First solution layer map unit, suitable for each point to being obtained after equilibrium treatment The mapping of layer data stream solution layer recovers to each sub-data flow;Described first despreads unit, suitable for by solution layer mapping recovery Each sub-data flow carries out despreading operation.
Another when it is implemented, the second processing unit despreads unit including second and the second multiple-input, multiple-output receive Processing unit;Described second despreads unit, suitable for carrying out despreading behaviour to the frequency domain data by obtaining after OFDM demodulation Make;The second multiple-input, multiple-output reception processing unit, suitable for carrying out multiple-input, multiple-output reception to the data after despreading operation Processing, the second multiple-input, multiple-output reception processing unit include:Second channel estimation unit, suitable for the pilot number to extraction According to progress channel estimation;Second chooses unit, suitable for choosing pre-coding matrix according to the sending mode of communication system;Second is balanced Processing unit, suitable for the result based on channel estimation and the pre-coding matrix of selection to the frequency of each physical sub-carrier received Numeric field data carries out equilibrium treatment;Second solution layer map unit, suitable for mapping the layered data flows solution layer obtained after equilibrium treatment Recover to sub-data flow.
It should be noted that when actually implementing, the signal receiving device of described communication system can include receiving list Member, it is connected with the OFDM demodulation unit, the radiofrequency signal suitable for being received for reception antenna carries out down-conversion operation, produces Baseband signal, which exports, gives OFDM demodulation unit.Reception antenna can be included among the receiving unit, and the receiving unit can To be multiple independent reception antennas or smart antenna array.
The specific implementation of the signal receiving device of the communication system may be referred to the signal acceptance method of communication system Implement, will not be repeated here.
Embodiment of the present invention also provides a kind of communication system including above-mentioned sender unit and signal receiving device. The communication system is illustrated with specific embodiment below.
Figure 11 is the schematic diagram of communication system provided in an embodiment of the present invention, and as shown in figure 11, the present embodiment provides logical Letter system is a kind of communication system of multiple-input, multiple-output code spread orthogonal frequency division multiplexing, and the communication system includes above-mentioned sender unit And signal receiving device.In actual conditions, it is believed that base station including above-mentioned sender unit and connect including above-mentioned signal The terminal of receiving apparatus forms the communication system, it is also assumed that the terminal including above-mentioned sender unit and including above-mentioned letter The base station of number reception device forms the communication system, it is also believed that including above-mentioned sender unit and signal receiving device Base station or terminal form the communication system.
As a rule, base station and terminal can all include above-mentioned sender unit and signal receiving device.Base station and terminal (UE, User Equipment)Handle similar, include signal in base station and terminal and send processing and signal reception processing two Point, correspond respectively to the function that sender unit and signal receiving device are realized.Communication system shown in Figure 11, it is actual real Can be base station or the terminal for including sender unit and signal receiving device when applying, the transmission included by sender unit Unit can be combined into antenna element with the receiving unit included by signal receiving device.Signal transmission processe department point:According to channel The sending methods such as information selection spatial reuse, transmitting diversity or single antenna transmission.Determine spatial reuse, transmitting diversity or single antenna Processing unit is sent by coded modulation unit, the first spectrum-spreading unit, the first MIMO respectively after the sending method of transmission, OFDM is modulated Unit carries out the operations such as coded modulation, spread spectrum, MIMO transmissions processing, OFDM modulation to multichannel original data stream, after framing Data deliver to antenna element wireless transmission after up-conversion, power control;Signal reception processing part:Antenna element is for receiving To wireless signal carry out down-converted and be transformed into baseband signal, and according to parameters such as antenna number, sending methods by described OFDM demodulation unit, the first MIMO reception processings unit, first despread unit, demodulation coding unit enters to baseband signal respectively Row OFDM demodulation, MIMO reception processings, despread, the operation such as demodulation coding, recover the raw information sent.Above-mentioned first spread spectrum Unit and the first MIMO send processing unit and are contained in foregoing first processing units, the first MIMO reception processings unit, First, which despreads unit, is contained in foregoing second processing unit.
The b shown in Figure 110…bNt-1Represent original Nt roads original data stream to be sent and s0…sNt-1、c0…cNt-1、 e0…eM-1、X0…XM-1What is represented respectively is by the coded modulation unit, the first spectrum-spreading unit, the first MIMO transmissions processing The data flow obtained after unit, the processing of OFDM modulating units;Y0…YM-1The M roads wireless signal that expression receives, and f0…fM-1、 c0…cNr-1、s0…sNr-1、b0…bNr-1What is represented respectively is by the OFDM demodulation unit, the first MIMO reception processing lists Member, first despread the data flow obtained after unit, demodulation coding cell processing.
The specific implementation of communication system described in the present embodiment may be referred to the sending method of above-mentioned signal and device, signal The implementation of method of reseptance and device, will not be repeated 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, the advantages of combining several technologies, the availability of frequency spectrum is improved using OFDM technology, receiver equalization complexity is reduced, adopts Frequency selective fading is effectively antagonized with CDMA technology and co-frequency neighbor cell is disturbed, and MIMO technology utilization space multiplexing technology is effective The transmission rate of system is improved, this system can well adapt to mobile and fixed environment, preferably carry out identical networking, have Larger system transfer rate.Technical solution of the present invention combines the technologies such as OFDM, MIMO, CDMA and adaptive coding and modulating, The ability for making communication system that there is high stability, high-throughput and identical networking.
It will be understood by those skilled in the art that realize the communication system and its sender unit and letter in above-described embodiment The all or part of number reception device is by program the hardware of correlation can be instructed to complete, and described program can store In computer-readable recording medium, the storage medium can be ROM, RAM, magnetic disc, CD etc..
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair Bright technical scheme makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention Protection domain.

Claims (12)

  1. A kind of 1. signaling method of communication system, it is characterised in that including:
    According to channel information, it is respectively channel encoded to sent every sub-data stream and constellation mapping;
    Spread spectrum operation is carried out to the sub-data flow by channel coding and constellation mapping based on spread spectrum parameter;
    Multiple-input, multiple-output transmission processing is carried out to the sub-data flow after the spread spectrum operation;
    OFDM modulation is carried out to the sub-data flow after multiple-input, multiple-output transmission processing, and will modulate what is obtained afterwards by OFDM OFDM symbol data stream is output to transmitting antenna and is transmitted, including:In identical character position insertion respective antenna port Frequency pilot sign is simultaneously mapped to each physical sub-carrier;Serial to parallel conversion is carried out to the sub-data flow of each antenna port respectively, and carried out Inverse fast Fourier transform, insertion cyclic prefix are transmitted so that OFDM symbol formation physical frame is output into transmitting antenna.
  2. 2. the signaling method of communication system according to claim 1, it is characterised in that
    The spread spectrum parameter comprises at least spreading factor and subcode road number;
    The multiple-input, multiple-output transmission processing includes:Sub-data flow after the spread spectrum operation is subjected to layered mapping, the layering It is mapped as the layer mapping of single antenna, the layer mapping of transmitting diversity or the layer mapping of spatial reuse;To the subdata after layered mapping Stream carries out corresponding precoding processing.
  3. 3. the signaling method of communication system according to claim 2, it is characterised in that also include:In channel coding With constellation mapping afterwards and before spread spectrum operation, or after spread spectrum operation and before multiple-input, multiple-output transmission processing, to every road Sub-data flow carries out randomization operation.
  4. 4. the signaling method of communication system according to claim 1, it is characterised in that also include:In channel coding With after constellation mapping and before multiple-input, multiple-output transmission processing, randomization operation is carried out to every sub-data stream.
  5. 5. the signaling method of communication system according to claim 1, it is characterised in that when carrying out the spread spectrum operation Subcode road number be less than or equal to spreading factor.
  6. 6. the signaling method of communication system according to claim 1, it is characterised in that also include:In channel coding Before, or after the channel encoding and before constellation mapping, Scrambling Operation is carried out to every sub-data stream.
  7. 7. the signaling method of communication system according to claim 1, it is characterised in that the channel information includes letter At least one of road quality instruction, channel order instruction and the instruction of pre-coding matrix code.
  8. A kind of 8. sender unit of communication system, it is characterised in that including:
    Coded modulation unit, suitable for according to channel information, being respectively channel encoded to sent every sub-data stream and star Seat mapping;
    First processing units, suitable for carrying out spread spectrum operation to the sub-data flow by channel coding and constellation mapping and entering more more Go out transmission processing;The first processing units include the first spectrum-spreading unit and the first multiple-input, multiple-output and send processing unit, and described the One spectrum-spreading unit, suitable for carrying out spread spectrum operation, institute to the sub-data flow by channel coding and constellation mapping based on spread spectrum parameter State the first multiple-input, multiple-output and send processing unit, suitable for carrying out multiple-input, multiple-output transmission to the sub-data flow after the spread spectrum operation Processing;
    OFDM modulating units, suitable for carrying out OFDM tune to the sub-data flow after spread spectrum operation and multiple-input, multiple-output transmission processing System, and the OFDM symbol data stream obtained afterwards by OFDM modulation is output to transmitting antenna and is transmitted;Including:First OFDM Modulation subunit, carried suitable for inserting the frequency pilot sign of respective antenna port in identical character position and being mapped to each physics Ripple;2nd OFDM modulation subunits, suitable for carrying out serial to parallel conversion to the sub-data flow of each antenna port respectively, and carry out quick Fu In leaf inverse transformation, insertion cyclic prefix so that OFDM symbol formation physical frame to be output to transmitting antenna and is transmitted.
  9. 9. the sender unit of communication system according to claim 8, it is characterised in that
    The spread spectrum parameter comprises at least spreading factor and subcode road number;
    First multiple-input, multiple-output, which send processing unit, to be included:First layer map unit, suitable for by after the spread spectrum operation Sub-data flow carries out layered mapping, and the layered mapping is the layer mapping of single antenna, the layer of transmitting diversity maps or spatial reuse Layer mapping;First precoding processing unit, suitable for carrying out corresponding precoding processing to the sub-data flow after layered mapping.
  10. 10. the sender unit of communication system according to claim 9, it is characterised in that also including the first randomization Unit, suitable for after channel coding and constellation mapping and before spread spectrum operation, or after spread spectrum operation and multiple-input, multiple-output Before transmission processing, randomization operation is carried out to every sub-data stream.
  11. 11. the sender unit of communication system according to claim 8, it is characterised in that also include:Second randomization Unit, suitable for after channel coding and constellation mapping and multiple-input, multiple-output transmission processing before, to every sub-data stream carry out with Machineization operates.
  12. 12. the sender unit of communication system according to claim 8, it is characterised in that the coded modulation unit Including scrambling unit, suitable for before channel coding, or after the channel encoding and before constellation mapping, to every sub-data Stream carries out Scrambling Operation.
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