CN101374006A - Multiplexing transmission method and system for multi-input multi-output OFDM system closed-loop space - Google Patents
Multiplexing transmission method and system for multi-input multi-output OFDM system closed-loop space Download PDFInfo
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Abstract
The invention discloses a close-loop spatial multiplexing transmission method for a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system, and a system thereof. The method comprises: converting original information bits to multiple paths of sub-data streams via layered mapping, coding and modulating each sub-data stream according to close-loop channel information, and carrying out data randomization operation to obtain randomized sub-data streams; and inserting pilot signals in each randomized sub-data stream, carrying out OFDM modulation of each randomized sub-data stream in which pilot signals are inserted to obtain OFDM symbol data streams, and transmitting with a corresponding transmitting antenna. The inventive method reduces the requirements of the MIMO OFDM system for MIMO channel independence, and improves the transmission rate of the system by using spatial multiplexing technology and channel information without losing the performance stability of the system.
Description
Technical field
The present invention relates to communication system, more specifically relate to closed loop (Close-loop) spatial reuse (SpatialMultiplexing) launching technique and the system of a kind of multiple-input, multiple-output (MIMO), OFDM (OFDM) wireless communication system.
Background technology
Development along with Digital Signal Processing and high speed device, oneself has not existed the obstacle of initial realization OFDM technology, and OFDM has obtained successful application in DAB (digital audio broadcasting), DVB (digital video broadcasting) and WLAN systems such as (WLAN (wireless local area network)).OFDM utilizes the orthogonality between each subcarrier, allows the frequency spectrum of subchannel overlapped, can utilize frequency spectrum resource largely.It passes through string and conversion to high-speed data-flow, make the data symbol persistence length on each subcarrier increase relatively, thereby reduced the intersymbol interference that temporal dispersion brought (ISI) of wireless channel effectively, simultaneously because the bandwidth relative narrower of each subchannel, equilibrium just can be carried out respectively each subcarrier, has so just reduced complexity balanced in the receiver.Because These characteristics, this technology is widely used in recent years.
MIMO is meant and uses a plurality of transmitting antennas and reception antenna respectively at transmitting terminal and receiving terminal.The basic thought of MIMO is in emission, receives or the transmitting-receiving both-end adopts a plurality of antennas, and treatment technology during by sky makes full use of the independent fading characteristic of interchannel, improves the availability of frequency spectrum, communication quality and power system capacity.Mimo system has made full use of the abundant wireless channel of scattering between transmitting terminal and the receiving terminal, and a plurality of different data streams of being sent by launching antenna array all have distinctive, differentiable spatial character at receiving terminal, and promptly channel has the multidimensional characteristic.Therefore mimo channel can be regarded as by the parallel subchannel of minimum number of antennas in the two ends and forms, and then the capacity of whole M IMO channel is exactly all subchannel capacities sums.
In the communication system in future, the feasible demand to frequency spectrum of the surge of high speed business and number of users sharply increases, and frequency spectrum resource is limited, so technology in conjunction with MIMO and these two advanced persons of OFDM, the availability of frequency spectrum can be improved on the one hand, frequency selective fading can be effectively resisted on the other hand.
The MIMO technology comprises two kinds of diversity and spatial reuses, (frequently empty) code diversity was representative when wherein diversity technique was mainly with sky, it mainly utilizes Space Time Coding and increases the redundant information of transmission, thereby improves the stability of wireless transmission, but does not improve the availability of frequency spectrum of system; And space multiplexing technique is mainly utilized the degree of freedom by the mimo system that multipath transmisstion brought of wireless channel, if each is separate to the decline in dual-mode antenna path, then can utilize these parallel channels to transmit independently information flow, thereby improve the data transmission rate of system.
When under the closed loop mode of known channel information, using, precoding Precoding method is utilized receiving terminal gained channel estimation calculation antenna weights, and it is fed back to transmitting terminal be weighted emission, reach mimo channel is divided into the purpose that spatial reuse is carried out in a plurality of separate parallel channels.But its performance depends on the code book number that feeds back weights.The increase of code book number can bring the lifting of performance still to increase the load of feedback channel, reduces the loss that the code book number then can bring performance.Therefore under closed loop mode, require during the multiplex technique of application space and can on the basis of the stability of the system of assurance, must utilize channel information to improve systematic function and channel capacity according to the feedback information self adaptation.Should guarantee the stability of mimo system performance and the quality and the efficient of feedback information in this case, guarantee the spatial multiplexing gain and the transmission rate of mimo system again.
In sum, the technical scheme of the Closed-Loop Spatial Multiplexing emission of a kind of multi-input multi-output-orthogonal frequency-division multiplexing wireless communication system of current needs, under closed loop mode, guarantee the stability of mimo system performance and the quality and the efficient of feedback information, guarantee the spatial multiplexing gain and the transmission rate of mimo system simultaneously.
Summary of the invention
Technical problem to be solved by this invention provides a kind of Closed-Loop Spatial Multiplexing launching technique and system of multi-input multi-output-orthogonal frequency-division multiplexing system, thereby make the MIMO+OFDM communication system reduce requirement, and on the basis that guarantees systematic function stability, utilize space multiplexing technique and channel information to improve the transmission rate of system mimo channel independence.
In order to address the above problem, the invention provides a kind of Closed-Loop Spatial Multiplexing launching technique of multi-input multi-output-orthogonal frequency-division multiplexing system, may further comprise the steps,
A, convert original information bits to the multichannel sub data flow through layering mapping after, according to the closed loop channel information every way data flow is carried out coded modulation, then carry out the data randomization operation, obtain the sub data flow after the randomization;
B, to after inserting pilot signal in the sub data flow after the randomization of every road, the sub data flow that every road is inserted after the randomization of pilot signal carries out the OFDM modulation, obtains the OFDM symbol data flow and launches on the transmitting antenna of correspondence.
Further, said method also can comprise, among the described step a, according to channel information original information bits is divided into the V layer, converts individual-layer data to M way data flow through string and after changing then, it is mapped to respectively on the corresponding transmitting antenna, wherein M is a number of transmit antennas, and V≤M.
Further, said method also can comprise, among the described step a,
Possess under the good closed-loop case of feedback model or time division duplex up-downgoing channel symmetry in Frequency Division Duplexing (FDD), the channel condition information of the data based closed loop channel of described every way data flow or the information of channel quality identification are carried out corresponding adaptive coding and modulating, may further comprise the steps:
Data stream is carried out adaptive chnnel coding, obtain encoded data stream;
Described encoded data stream is carried out the planisphere mapping, sub data flow after the acquisition coded modulation.
Further, said method can comprise that also described chnnel coding is: code check convolutional encoding, Turbo coding or low density parity check code coding.
Further, said method also can comprise, among the described step a, sub data flow after the coded modulation on described every road is distributed the data randomization operation that different scramblers carries out scrambling or distributes a different interleaving device to interweave, obtain the sub data flow after the randomization.
Further, said method also can comprise, among the described step b, the sub data flow after the randomization of every road insertion pilot signal is carried out the OFDM modulation, may further comprise the steps:
Go here and there and change, the sub data flow that insert after the randomization of pilot signal on every road obtains N
FFTIndividual parallel low speed sub data flow, wherein N
FFTNumber for OFDM modulation sub-carriers;
The low speed sub data flow is carried out inverse fast fourier transform, obtain the parallel OFDM symbol data flow in M road;
The OFDM symbol data flow is added Cyclic Prefix, finish the OFDM modulated process.
The present invention also provides a kind of Closed-Loop Spatial Multiplexing emission system of multi-input multi-output-orthogonal frequency-division multiplexing system, it is characterized in that, comprise, layering and antenna map unit, adaptive coding and modulating unit, randomization unit, insertion pilot tone become frame unit, OFDM modulate emission unit, wherein
Layering and antenna map unit are used for converting original information bits to the multichannel sub data flow through the layering mapping, and are transferred to the adaptive coding and modulating unit;
The adaptive coding and modulating unit is used for according to the closed loop channel information, and every way data flow of layering and antenna map unit transmission is carried out coded modulation, obtains sub data flow after the coded modulation, is transferred to the randomization unit;
The randomization unit is used for sub data flow after the coded modulation of adaptive coding and modulating unit, every road transmission is carried out randomization operation, obtains the sub data flow after the randomization, is transferred to insert pilot tone and become frame unit;
Insert pilot tone and become frame unit, be used for the sub data flow after the randomization of randomization unit transmission is inserted pilot signal, be transferred to OFDM modulate emission unit;
OFDM modulate emission unit, be used for becoming the sub data flow after the randomization of insertion pilot signal of frame unit transmission to carry out the OFDM modulation to inserting pilot tone, obtain OFDM modulation symbol data stream, and it is assigned on the corresponding transmitting antenna launches.
Further, said system also can comprise, described layering and antenna map unit, information according to the order of channel matrix is divided into the V layer with original information bits, then will individual-layer data converts M way data flow to after through string and conversion, and it is mapped to respectively on the corresponding transmitting antenna, and be transferred to the adaptive coding and modulating unit, wherein M is a number of transmit antennas, and V≤M, and M is a positive number.
Further, said system also can comprise, described adaptive coding and modulating unit, according to the information of the channel condition information or the channel quality identification of closed loop channel, determine the code modulation mode of each sub data flow, then each sub data flow is carried out chnnel coding, obtain encoded data stream, it is carried out constellation mapping, obtain sub data flow after the coded modulation, be transferred to the randomization unit.
Further, said system can comprise that also described chnnel coding is: code check convolutional encoding, Turbo coding or low density parity check code coding.
Further, said system can comprise that also the randomization operation of described randomization unit comprises distributes a different scrambler to carry out scrambler or distribute a different interleaved sequence to interweave to sub data flow after the coded modulation of every road.
Further, said system also can comprise, go here and there and conversion, inverse fast fourier transform and add Cyclic Prefix successively independently to the sub data flow after the randomization of inserting pilot signal described OFDM modulate emission unit, obtains OFDM modulation symbol data stream.
Compared with prior art, the present invention is by randoming scheme such as independently adopt scrambling respectively at each sub data flow or interweave, and then the compound channel that utilizes each scrambler/interleaved sequence and space channel to form distinguishes and transmits, thereby makes the MIMO+OFDM communication system reduce the requirement to mimo channel independence; On the basis that guarantees systematic function stability, utilize space multiplexing technique to improve the transmission rate of system; Can adopt data hierarchy and adaptive code modulation method further to improve the stability and the transmission rate of system according to channel information; And operand is less, is beneficial to very much Project Realization.
Description of drawings
Fig. 1 is the flow chart of the Closed-Loop Spatial Multiplexing launching technique of a kind of multi-input multi-output-orthogonal frequency-division multiplexing system in the specific embodiment of the invention;
Fig. 2 is the theory diagram of the Closed-Loop Spatial Multiplexing emission of multi-input multi-output-orthogonal frequency-division multiplexing wireless communication system in the specific embodiment of the invention;
Fig. 3 is that system produces the flow chart of each sub data flow to the framing emission from original information bits layering and antenna mapping in the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the invention is described further.
Main design of the present invention is to convert the data based channel information of armed original information bits to the multichannel sub data flow through the layering mapping; According to the closed loop channel information every way data flow is carried out independently adaptive coding and modulating; The sub data flow on described every road is carried out data randomization operation (comprise scrambling or interweave); Insert pilot signal in the data after the randomization of every road; Each data flow carried out being mapped to respectively on its corresponding transmitting antenna after the OFDM modulation launch.
As shown in Figure 1, the Closed-Loop Spatial Multiplexing launching technique of a kind of multiple-input, multiple-output, orthogonal frequency division multiplexing radio communication system comprises the steps:
Possess feedback model or TDD (time division duplex) up-downgoing channel symmetry preferably under the closed-loop case at FDD (Frequency Division Duplexing (FDD)), the data of described every way data flow can be carried out corresponding adaptive coding and modulating according to the CSI (channel condition information) or the CQI information such as (channel quality identifications) of closed loop channel, thereby further improve the transmission rate of system.
This process may further comprise the steps:
Data stream is carried out adaptive chnnel coding, obtain encoded data stream;
Chnnel coding can comprise various code check convolutional encodings, Turbo coding, LDPC (low density parity check code) coding etc. any one or multiple arbitrarily.
Described encoded data stream is carried out planisphere mapping, obtain sub data flow after the armed coded modulation.
Distribute a different scrambler to carry out scrambling or distribute data randomization operation such as a different interleaving device interweaves to sub data flow after the coded modulation on described every road, thereby obtain the sub data flow after the randomization of M road.
Insert pilot signal in step 140, the sub data flow after the randomization of M road;
Insert pilot signal in the sub data flow after the randomization of M road respectively.
This process may further comprise the steps:
Go here and there and change, the sub data flow that insert after the randomization of pilot signal on every road obtains N
FFTIndividual parallel low speed sub data flow;
The low speed sub data flow is carried out IFFT conversion (inverse fast fourier transform), obtain M road parallel OFDM symbol data streams;
The OFDM symbol data streams is added cyclic prefix CP, finish the OFDM modulated process.
N wherein
FFTNumber for OFDM modulation sub-carriers.
The OFDM modulation comprises string and conversion S/P, IFFT conversion and adds cyclic prefix CP.
Fig. 2 is the theory diagram of the Closed-Loop Spatial Multiplexing emission of multiple-input, multiple-output in the specific embodiment of the invention, orthogonal frequency division multiplexing radio communication system, the present invention is called randomization spatial reuse (Randomization-Spatial Multiplexing, R-SM) launch scenario.In order to realize the R-SM launch scenario, the Closed-Loop Spatial Multiplexing emission system of a kind of multiple-input, multiple-output, orthogonal frequency division multiplexing radio communication system is provided in the specific embodiment of the invention, comprise, layering and antenna map unit 1, adaptive coding and modulating unit 2, randomization unit 3, insertion pilot tone become frame unit 4, OFDM modulate emission unit 5, wherein
Layering and antenna map unit 1 are used for converting original information bits to the multichannel sub data flow through the layering mapping, and are transferred to adaptive coding and modulating unit 2;
Layering and antenna map unit 1, information such as order according to channel matrix are divided into the V layer with armed original information bits, convert individual-layer data to M way data flow through string and after changing then, it is mapped to respectively on the corresponding transmitting antenna, and be transferred to adaptive coding and modulating unit 2, wherein M is a number of transmit antennas, and V≤M, and M is a positive number.
In the specific embodiment of the invention, 1 couple of original information bits b of layering and antenna map unit carries out the mapping of layering and antenna respectively successively, obtains M way data flow b
m, m=1 wherein, 2 ..., M.
Adaptive coding and modulating unit 2 is used for according to the closed loop channel information, and every way data flow of layering and antenna map unit 1 transmission is carried out coded modulation, obtains sub data flow after the coded modulation, is transferred to randomization unit 3;
Adaptive coding and modulating unit 2, according to information such as the CQI of closed loop channel or CSI, M way data flow to 1 transmission of layering and antenna map unit is carried out adaptive channel encoding and modulation treatment successively independently, obtains sub data flow after the coded modulation, is transferred to randomization unit 3.
In the specific embodiment of the invention, at first determine the code modulation mode of each sub data flow, then to each sub-stream data b according to the closed loop channel information
mIn adaptive coding and modulating unit 2 it is carried out chnnel coding, chnnel coding can comprise various code check convolutional encodings, Turbo coding or LDPC coding etc., obtains encoded data stream d
mIt is carried out constellation mapping, obtain sub data flow s after the coded modulation
m
Randomization unit 3 is used for sub data flow after every road coded modulation of adaptive coding and modulating unit 2 transmission is carried out randomization operation, obtains the sub data flow after the randomization, is transferred to insert pilot tone and become frame unit 4;
Randomization operation comprises distributes a different scrambler to carry out scrambler or distributes a different interleaved sequence to interweave etc. sub data flow after the coded modulation of every road.
In the specific embodiment of the invention in the randomization unit 3 to sub data flow s after each coded modulation
mRandomization operation can comprise following two kinds of situations:
To sub data flow s after each coded modulation
mDistribute a different scrambler r
mCarry out scrambling operation, obtain the sub data flow x after the randomization
m=s
mR
m, wherein oeprator is represented the contraposition dot product;
To sub data flow s after each coded modulation
mDistribute a different interleaved sequence c
mCarry out interlace operation, obtain the sub data flow x after the randomization
m=permutation (s
m, c
m), wherein permutation represents s
mAccording to interleaved sequence c
mRearrange.
Carry out obtaining after the above-mentioned randomization operation sub data flow x after the randomization
m
Insert pilot tone and become frame unit 4, be used for the sub data flow after the randomization of randomization unit 3 transmission is inserted pilot signal, be transferred to OFDM modulate emission unit 5;
In the specific embodiment of the invention, MUX unit 4 is for inserting pilot cell, and the pilot signal of each data flow is distinguished with mutual position difference.
OFDM modulate emission unit 5 is used for becoming the sub data flow after the randomization of insertion pilot signal of frame unit 4 transmission to carry out the OFDM modulation to inserting pilot tone, obtains OFDM modulation symbol data stream, and it is assigned on the corresponding transmitting antenna launches.
OFDM modulate emission unit 5, become sub data flow after the randomization of insertion pilot signal of frame unit 4 transmission to go here and there independently successively and change S/P, IFFT conversion and add cyclic prefix CP to inserting pilot tone, then each sub data flow obtains OFDM modulation symbol data stream X
m=IFFT (x
m), and it is assigned on the corresponding transmitting antenna launches.
The invention will be further described below in conjunction with instantiation.
Fig. 3 has described system and produced the whole flow process of each sub data flow to the framing emission from original information bits layering and antenna mapping, and is specific as follows:
In the step 201, (order of supposing channel matrix is ρ at first can armed original information bits to be divided into the V layer according to (also not getting rid of according to other information layered) information such as order of channel matrix, and satisfy V≤ρ), then individual-layer data is mapped as M way data flow, it is mapped to respectively on the corresponding transmitting antenna;
In this example, layering and antenna map unit at first flow original information bits b and are divided into the V layer, then it be multiply by size and are the antenna mapping matrix of V * M, obtain M way data flow
Wherein M is a number of transmit antennas, and l is the number of each sub data flow original information bits.
In the step 202, every way data flow is carried out independently modulating-coding, obtain sub data flow after the coded modulation according to information such as channel CQI;
Data for each sub data flow of tier antenna mapping back are carried out chnnel coding and constellation modulation treatment successively independently, thereby obtain sub data flow after the coded modulation
N wherein
FFTBe the corresponding number of sub carrier wave of OFDM modulation.
In the step 203, sub data flow after the coded modulation on described every road is carried out the data randomization operation, obtain the sub data flow after the randomization;
Sub data flow after the coded modulation of every road is distributed a different scrambler to carry out the scrambling operation or distributes randomization operation such as a different interleaved sequence interweaves, obtain the sub data flow x after the randomization
m=s
mR
m, wherein oeprator is represented contraposition dot product, r
mRepresent the corresponding scrambler of each sub data flow; Or the sub data flow x after the randomization
m=permutation (s
m, c
m), wherein permutation represents s
mAccording to interleaved sequence c
mRearrange.
In the step 204, insert pilot signal p in the sub data flow after each randomization
m, the pilot signal of each data flow is distinguished with mutual position difference;
In the step 205, the sub data flow after the randomization of every road insertion pilot signal is carried out the OFDM modulation, and OFDM modulation symbol data flow point is not launched on its corresponding transmitting antenna.
Data x for each sub data flow after the randomization of every road insertion pilot signal
mGo here and there independently successively and change S/P, IFFT conversion and add cyclic prefix CP, then each sub data flow obtains OFDM modulation symbol data stream
And OFDM modulation symbol data flow point is not mapped on its corresponding transmitting antenna launches.
In a word, the Closed-Loop Spatial Multiplexing launching technique of a kind of radio MIMO disclosed in this invention+OFDM wireless communication system, compare with existent method, closed loop R-SM spatial reuse algorithm of the present invention is to after obtaining the multichannel sub data flow after by the mapping of layering and antenna, it is carried out independently adaptive coding and modulating operation, and use scrambling or method such as interweave are carried out randomization operation to every way data flow before OFDM modulation, on the basis that transmission rate does not reduce, improved adaptability with this to mimo channel, thus the stability of the system of assurance.
In a word, MIMO+OFDM wireless communication systems Closed-Loop Spatial Multiplexing method proposed by the invention do not expend too much system resource, and operand is very little when guaranteeing transmission rate, be beneficial to very much Project Realization.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (12)
1. the Closed-Loop Spatial Multiplexing launching technique of a multi-input multi-output-orthogonal frequency-division multiplexing system may further comprise the steps,
A, convert original information bits to the multichannel sub data flow through layering mapping after, according to the closed loop channel information every way data flow is carried out coded modulation, then carry out the data randomization operation, obtain the sub data flow after the randomization;
B, to after inserting pilot signal in the sub data flow after the randomization of every road, the sub data flow that every road is inserted after the randomization of pilot signal carries out the OFDM modulation, obtains the OFDM symbol data flow and launches on the transmitting antenna of correspondence.
2. the method for claim 1, it is characterized in that, among the described step a, according to channel information original information bits is divided into the V layer, convert individual-layer data to M way data flow through string and after changing then, it is mapped to respectively on the corresponding transmitting antenna, and wherein M is a number of transmit antennas, and V≤M.
3. method as claimed in claim 2 is characterized in that, among the described step a,
Possess under the good closed-loop case of feedback model or time division duplex up-downgoing channel symmetry in Frequency Division Duplexing (FDD), the channel condition information of the data based closed loop channel of described every way data flow or the information of channel quality identification are carried out corresponding adaptive coding and modulating, may further comprise the steps:
Data stream is carried out adaptive chnnel coding, obtain encoded data stream;
Described encoded data stream is carried out the planisphere mapping, sub data flow after the acquisition coded modulation.
4. method as claimed in claim 3 is characterized in that, described chnnel coding is: code check convolutional encoding, Turbo coding or low density parity check code coding.
5. method as claimed in claim 3, it is characterized in that, among the described step a, sub data flow after the coded modulation on described every road is distributed the data randomization operation that different scramblers carries out scrambling or distributes a different interleaving device to interweave, obtain the sub data flow after the randomization.
6. method as claimed in claim 2 is characterized in that, among the described step b, the sub data flow after the randomization of every road insertion pilot signal is carried out the OFDM modulation, may further comprise the steps:
Go here and there and change, the sub data flow that insert after the randomization of pilot signal on every road obtains N
FFTIndividual parallel low speed sub data flow, wherein N
FFTNumber for OFDM modulation sub-carriers;
The low speed sub data flow is carried out inverse fast fourier transform, obtain the parallel OFDM symbol data flow in M road;
The OFDM symbol data flow is added Cyclic Prefix, finish the OFDM modulated process.
7. the Closed-Loop Spatial Multiplexing emission system of a multi-input multi-output-orthogonal frequency-division multiplexing system, it is characterized in that, comprise that layering and antenna map unit, adaptive coding and modulating unit, randomization unit, insertion pilot tone become frame unit, OFDM modulate emission unit, wherein
Layering and antenna map unit are used for converting original information bits to the multichannel sub data flow through the layering mapping, and are transferred to the adaptive coding and modulating unit;
The adaptive coding and modulating unit is used for according to the closed loop channel information, and every way data flow of layering and antenna map unit transmission is carried out coded modulation, obtains sub data flow after the coded modulation, is transferred to the randomization unit;
The randomization unit is used for sub data flow after the coded modulation of adaptive coding and modulating unit, every road transmission is carried out randomization operation, obtains the sub data flow after the randomization, is transferred to insert pilot tone and become frame unit;
Insert pilot tone and become frame unit, be used for the sub data flow after the randomization of randomization unit transmission is inserted pilot signal, be transferred to OFDM modulate emission unit;
OFDM modulate emission unit, be used for becoming the sub data flow after the randomization of insertion pilot signal of frame unit transmission to carry out the OFDM modulation to inserting pilot tone, obtain OFDM modulation symbol data stream, and it is assigned on the corresponding transmitting antenna launches.
8. system as claimed in claim 7, it is characterized in that, described layering and antenna map unit, information according to the order of channel matrix is divided into the V layer with original information bits, then will individual-layer data converts M way data flow to after through string and conversion, and it is mapped to respectively on the corresponding transmitting antenna, and be transferred to the adaptive coding and modulating unit, wherein M is a number of transmit antennas, and V≤M, and M is a positive number.
9. system as claimed in claim 7, it is characterized in that, described adaptive coding and modulating unit, according to the information of the channel condition information or the channel quality identification of closed loop channel, determine the code modulation mode of each sub data flow, then each sub data flow is carried out chnnel coding, obtain encoded data stream, it is carried out constellation mapping, obtain sub data flow after the coded modulation, be transferred to the randomization unit.
10. system as claimed in claim 9 is characterized in that, described chnnel coding is: code check convolutional encoding, Turbo coding or low density parity check code coding.
11. system as claimed in claim 7 is characterized in that, the randomization operation of described randomization unit comprises distributes a different scrambler to carry out scrambler or distribute a different interleaved sequence to interweave to sub data flow after the coded modulation of every road.
12. system as claimed in claim 7, it is characterized in that, described OFDM modulate emission unit, sub data flow after the randomization of inserting pilot signal is gone here and there and conversion, inverse fast fourier transform and add Cyclic Prefix successively independently, obtain OFDM modulation symbol data stream.
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