CN102201899A - Signal transmission method, system and device of multi-input multi-output (MIMO) system - Google Patents
Signal transmission method, system and device of multi-input multi-output (MIMO) system Download PDFInfo
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Abstract
The invention discloses a signal transmission method, system and device of a multi-input multi-output (MIMO) system. The method comprises the following steps: a transmitting end sequentially performs operations of channel coding, interlacing, scrambling and constellation mapping on a signal; the transmitting end performs orthogonal processing on a channel gain matrix in the channel state information fed back by a receiving end, and performs non-linear pre-coding on the signal after the constellation mapping by use of the channel gain matrix after the orthogonal processing; and the transmitting end sends the signal after the non-linear pre-coding to a channel and transmits the signal to the receiving end through the channel. Through the invention, the situation of relatively poor channel conditions can be adapted to, interference among multiple users is reduced, the error rate of the system is reduced, the overall performance of the system is improved, the information overhead is reduced, the power control can be implemented more conveniently, and the requirement of users on fairness can be met.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method for transmitting signals of multi-input multi-output system, system and device.
Background technology
(Multiple-Input Multiple-Output, MIMO) technology can increase exponentially the wireless channel capacity to multiple-input and multiple-output under the situation that does not increase system bandwidth and antenna transmitting power, thereby become a key technology of following radio communication.
(Multiple-User Multiple-Input Multiple-Output, MU-MIMO) in the system down link, communicating by letter with a plurality of channel user altogether at identical running time-frequency resource in a base station, certainly exists common-channel interference at multi-user's multiple-input and multiple-output.The transmitting terminal precoding is a kind of effective scheme that solves co-channel interference problems.Present precoding technique can be divided into linear predictive coding and nonlinear precoding, and nonlinear precoding has the lower error rate and the capacity of Geng Gao than linear predictive coding.
The modular algebra precoding is at present a kind of nonlinear precoding scheme of practical MU-MIMO system down link.This scheme mainly comprises feedback interference elimination, delivery, feed-forward process and receives decoding (comprise weighting, ask mould and judgement) part.Feed-forward process can make equivalent channel matrix become a triangular matrix, user's interference just becomes causal like this, also be that certain user only is subjected to its front user or only is subjected to the interference of its subsequent user, this makes feedback interference eliminate filtering physics and can realize, modulo operation mainly limits transmit signal power, and receiving terminal carries out corresponding decoded operation just can recover initial data.
Existing modular algebra pre-coding scheme all decomposes based on the QR to actual channel and designs feedforward matrix and feedback matrix etc., can be divided into ZF modular algebra scheme and least mean-square error modular algebra scheme according to different criterions.User's interference is zero under the ZF modular algebra scheme, and least mean-square error modular algebra scheme has been considered The noise, allows a part of user to disturb, but the received signal and an error minimum that transmits.
Existing nonlinear precoding scheme has advantages such as the simple and practicality of principle is good, but all directly the actual feedback channel matrix is handled, do not satisfy under the row quadrature condition at channel, the user receives noise and is amplified in various degree, user's error rate is along with coded sequence uprises successively, therefore its performance of user of back face code can be very poor, even there is a possibility of the infinite amplification of noise, be difficult to satisfy the user fairness requirement, this moment, the overall performance of system also can be had a strong impact on, and the weighted factor value of receiving terminal user decoding need be delivered to receiving terminal by transmitting terminal, has increased information overhead.
Summary of the invention
The embodiment of the invention provides a kind of method for transmitting signals, system and device of multi-input multi-output system, in order to the error rate of reduction transmission, and the overall performance of raising system.
The signal transmitting method of a kind of multi-input multi-output system that the embodiment of the invention provides comprises:
To signal carry out chnnel coding successively, interweave, scrambling and constellation mapping operation;
Channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing, and utilize through the signal of the channel gain matrix after the orthogonal processing after and carry out nonlinear precoding constellation mapping;
To send to channel through the signal of nonlinear precoding, channel is transferred to receiving terminal.
The signal acceptance method of a kind of multi-input multi-output system that the embodiment of the invention provides comprises:
Channel condition information is fed back to transmitting terminal;
Receive the signal that transmitting terminal sends, wherein, described signal is that transmitting terminal utilizes the channel gain matrix in the channel condition information of receiving terminal feedback to carry out nonlinear precoding through the channel gain matrix after the orthogonal processing;
To this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
A kind of signal transmission system that the embodiment of the invention provides comprises:
Transmitting terminal, be used for to signal carry out chnnel coding, interweave, scrambling and constellation mapping, and nonlinear precoding operation, and, the signal of handling is sent to channel, channel is transferred to receiving terminal;
Receiving terminal is used for channel condition information is fed back to described transmitting terminal, and, receive from the signal of the channel transmission of described transmitting terminal emission, and to this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
The sender unit of a kind of multi-input multi-output system that the embodiment of the invention provides comprises:
First processing unit, be used for to signal carry out chnnel coding, interweave, scrambling and constellation mapping operation;
Second processing unit is used for the channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing;
Precoding unit is used to utilize through the signal of the channel gain matrix after the orthogonal processing after to constellation mapping and carries out nonlinear precoding;
Transmitting element is used for the signal through nonlinear precoding is sent to channel, and channel is transferred to receiving terminal.
The signal receiving device of a kind of multi-input multi-output system that the embodiment of the invention provides comprises:
Feedback unit is used for channel condition information is fed back to transmitting terminal;
Receiving element is used to receive the signal that transmitting terminal sends, and wherein, described signal is that the channel gain matrix of transmitting terminal utilization from the channel condition information of feedback unit feedback carried out nonlinear precoding through the channel gain matrix after the orthogonal processing;
Processing unit, be used for to the signal that receiving element receives ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
As seen through the above technical solutions, the embodiment of the invention in the signal emission process of multi-input multi-output system, transmitting terminal to signal carry out chnnel coding successively, interweave, scrambling and constellation mapping operation; Channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing, and utilize through the signal of the channel gain matrix after the orthogonal processing after and carry out nonlinear precoding constellation mapping; To send to channel through the signal of nonlinear precoding, channel is transferred to receiving terminal.The embodiment of the invention is in the signal receiving course of multi-input multi-output system, and receiving terminal feeds back to transmitting terminal with channel condition information; Receive the signal that transmitting terminal sends, wherein, described signal is that transmitting terminal utilizes the channel gain matrix in the channel condition information of receiving terminal feedback to carry out nonlinear precoding through the channel gain matrix after the orthogonal processing; To this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.Therefore, the embodiment of the invention can the relatively poor situation of adaptive channel condition, reduces the interference between the multi-user, the error rate of reduction system, the overall performance of raising system reduces the convenient power that carries out of information overhead and energy and controls, and can also satisfy the requirement of user fairness.
Description of drawings
Fig. 1 is the structural representation of system embodiment of the present invention;
Fig. 2 is the structural representation of the emitter of the embodiment of the invention;
Fig. 3 is the structural representation of second processing unit of the emitter of the embodiment of the invention;
Fig. 4 is the structural representation of precoding unit of the emitter of the embodiment of the invention;
Fig. 5 is the structural representation of the receiving system of the embodiment of the invention;
Fig. 6 is the schematic flow sheet of a specific embodiment of the inventive method;
Fig. 7 is the schematic flow sheet of another specific embodiment of the inventive method.
Embodiment
In embodiments of the present invention, in the signal emission process, transmitting terminal to signal carry out chnnel coding successively, interweave, scrambling and constellation mapping operation; Described transmitting terminal carries out orthogonal processing to the channel gain matrix from the channel condition information of receiving terminal feedback, and utilizes through the signal of the channel gain matrix after the orthogonal processing after to constellation mapping and carry out nonlinear precoding; Described transmitting terminal will send to channel through the signal of nonlinear precoding, and channel is transferred to receiving terminal.In the signal receiving course, receiving terminal feeds back to transmitting terminal with channel condition information; Receiving terminal receives the signal that transmitting terminal sends, and wherein, described signal is that transmitting terminal utilizes the channel gain matrix in the channel condition information of receiving terminal feedback to carry out nonlinear precoding through the channel gain matrix after the orthogonal processing; Described receiving terminal to this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
Fig. 1 is the structural representation of system embodiment of the present invention.
Referring to shown in Figure 1, the system of the embodiment of the invention comprises transmitting terminal 11, receiving terminal 12.
Transmitting terminal 11, be used for to signal carry out chnnel coding, interweave, scrambling and constellation mapping, and nonlinear precoding operation, and, the signal of handling is sent to channel, arrive receiving terminal 12 through described Channel Transmission;
Receiving terminal 12 is used for channel condition information is fed back to described transmitting terminal 11, and, receive from the signal of the channel transmission of described transmitting terminal 11 emissions, and to this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
Transmitting terminal 11 utilizes lattice base reduction (LLL) algorithm that the channel gain matrix of obtaining from receiving terminal 12 is carried out the lattice point minimizing and handles, then the channel gain matrix after handling being carried out QR decomposes, obtain feedforward matrix respectively and return the feedback matrix, then utilize feedforward matrix that the signal through the constellation mapping operation is carried out feed-forward process, and utilize feedback matrix to eliminate carrying out feedback interference through the signal after the feed-forward process.
Referring to shown in Figure 2, a kind of emitter that is applied in the said system that the embodiment of the invention provides comprises: first processing unit 21, second processing unit 22, precoding unit 23, transmitting element 24.
First processing unit 21, be used for to signal carry out chnnel coding, interweave, scrambling and constellation mapping operation;
Second processing unit 22 is used for the channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing;
Precoding unit 23 is used to utilize through the signal of the channel gain matrix after the orthogonal processing after to constellation mapping and carries out nonlinear precoding;
Transmitting element 24 is used for the signal through nonlinear precoding is sent to channel, and channel is transferred to receiving terminal.
Referring to shown in Figure 3, a kind of second processing unit 22 that is applied in the emitter in the said system that the embodiment of the invention provides comprises: acquiring unit 31, orthogonal processing unit 32.
Acquiring unit 31 is used to obtain the channel condition information that described receiving terminal feeds back;
Orthogonal processing unit 32 is used for utilizing the LLL algorithm to reduce processing to carry out lattice point from the channel gain matrix of described channel condition information, obtains the equivalent channel gain matrix.
Referring to shown in Figure 4, a kind of precoding unit 23 that is applied in the emitter in the said system that the embodiment of the invention provides comprises: resolving cell 41, feed-forward process unit 42, feedback interference are eliminated unit 43.
Resolving cell 41 is used for that described equivalent channel gain matrix is carried out QR and decomposes, and obtains feedforward matrix and feedback matrix;
Feed-forward process unit 42 is used to utilize feedforward matrix that the signal through the constellation mapping operation is carried out feed-forward process;
Feedback interference is eliminated unit 43, is used to utilize feedback matrix to eliminate carrying out feedback interference through the signal after the feed-forward process.
Referring to shown in Figure 5, a kind of receiving system that is applied in the said system that the embodiment of the invention provides comprises: feedback unit 51, receiving element 52, processing unit 53.
Feedback unit 51 is used for channel condition information is fed back to transmitting terminal;
Receiving element 52 is used to receive the signal that transmitting terminal sends, and wherein, described signal is that the channel gain matrix of transmitting terminal utilization from the channel condition information of feedback unit 51 feedbacks carried out nonlinear precoding through the channel gain matrix after the orthogonal processing;
Processing unit 53, be used for to the signal that receiving element 52 receives ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
The detailed process of embodiment of the invention method is described below in conjunction with Fig. 6 and Fig. 7.
Referring to shown in Figure 6, the method for the embodiment of the invention may further comprise the steps:
Step 601: transmitting terminal to signal carry out chnnel coding successively, interweave, scrambling and constellation mapping operation.
Step 602: described transmitting terminal carries out orthogonal processing to the channel gain matrix from the channel condition information of receiving terminal feedback, and utilizes through the signal of the channel gain matrix after the orthogonal processing after to constellation mapping and carry out nonlinear precoding.
Here, it is described when the channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing, utilize the LLL algorithm that the channel gain matrix from described channel condition information is carried out lattice point and reduce processing, described channel gain matrix H is done following processing:
Wherein matrix T is a unimodular matrix, and its element value is integer, and satisfies det (T)=± 1, obtains the equivalent channel gain matrix.Then described equivalent channel gain matrix being carried out QR decomposes, obtain feedforward matrix and feedback matrix, utilize feedforward matrix that the signal through the constellation mapping operation is carried out feed-forward process, and utilize feedback matrix to eliminate carrying out feedback interference through the signal after the feed-forward process.
Step 603: described transmitting terminal will send to channel through the signal of nonlinear precoding, and channel is transferred to receiving terminal.
Fig. 7 is the schematic flow sheet of a specific embodiment of the inventive method.
Referring to shown in Figure 7, present embodiment is as follows in the detailed process of carrying out:
Step 701: the base station obtains the signal from the upper-layer protocol stack.
Step 702: the base station to the signal that obtains carry out chnnel coding, interweave, scrambling, constellation mapping.
Step 703: the base station obtain receiving terminal feedback channel state matrix (Channel State Information, CSI).
Here, Frequency Division Duplexing (FDD) (Frequency Division Duplexing, FDD) in the mimo system, the base station can add pilot frequency information in transmitting, finish estimation to wireless channel by pilot tone, receiving terminal receives and the feedback channel gain matrix is given the base station.
Step 704: layer map operation.
Here, the complex value modulation symbol that will transmit by layer map operation is mapped to a plurality of layers, for the non-linear modular algebra precoding of concrete enforcement MU-MIMO is prepared.
Step 705: utilize the LLL algorithm that the channel gain matrix of obtaining from receiving terminal is carried out lattice point and reduce processing.
Here, the thought that lattice point reduces is by the base vector of modification channel gain matrix, manages to reduce the correlation between the base vector, and Euclidean distance is the shortest each other to make it.The LLL algorithm is the method for correlation between a kind of minimizing base vector commonly used, and it can find the lattice point base that short vector characteristic is arranged on polynomial time stage.Utilize the LLL algorithm that channel gain matrix is carried out lattice point and reduce to handle, can be under the prerequisite that does not significantly increase complexity the bigger lifting of obtained performance, have good practicability.
Step 706: the channel gain matrix after handling is carried out QR decompose, obtain feedforward matrix and feedback matrix respectively.
Step 707: feed-forward process and feedback interference are eliminated.
Step 708: base station transmit signals, channel is transferred to receiving terminal.
Here, after finishing pre-encode operation, the processing that requirement is correlated with according to real system is as OFDM (Orthogonal Frequency Division Multiplexing, OFDM) modulation etc. is launched through up-conversion the signal handled at last from antenna port.
Step 709: receiving terminal receives the signal of the channel transmission of base station.
Step 710: receiving terminal to this signal ask mould, judgement, demodulation, go to disturb, deinterleave, channel decoding.
In step 709 and step 710 process, each terminal utilizes antenna to receive from signal of base station, because the base station has been eliminated the interference of mimo system multiple user signals in advance by precoding, so operations such as receiving terminal only needs to carry out down-conversion to received signal successively, asks mould, judgement, demodulation, goes to disturb, deinterleaves, channel decoding just can obtain original emission data.
As seen through the above technical solutions, the embodiment of the invention in the signal emission process of multi-input multi-output system, transmitting terminal to signal carry out chnnel coding successively, interweave, scrambling and constellation mapping operation; Described transmitting terminal carries out orthogonal processing to the channel gain matrix from the channel condition information of receiving terminal feedback, and utilizes through the signal of the channel gain matrix after the orthogonal processing after to constellation mapping and carry out nonlinear precoding; Described transmitting terminal will send to channel through the signal of nonlinear precoding, and channel is transferred to receiving terminal.The embodiment of the invention is in the signal receiving course of multi-input multi-output system, and receiving terminal feeds back to transmitting terminal with channel condition information; Receiving terminal receives the signal that transmitting terminal sends, and wherein, described signal is that transmitting terminal utilizes the channel gain matrix in the channel condition information of receiving terminal feedback to carry out nonlinear precoding through the channel gain matrix after the orthogonal processing; Described receiving terminal to this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.Therefore, the embodiment of the invention can the relatively poor situation of adaptive channel condition, reduces the interference between the multi-user, the error rate of reduction system, the overall performance of raising system reduces the convenient power that carries out of information overhead and energy and controls, and can also satisfy the requirement of user fairness.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. the signal transmitting method of a multi-input multi-output system is characterized in that, this method may further comprise the steps:
To signal carry out chnnel coding successively, interweave, scrambling and constellation mapping operation;
Channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing, and utilize through the signal of the channel gain matrix after the orthogonal processing after and carry out nonlinear precoding constellation mapping;
To send to channel through the signal of nonlinear precoding, channel is transferred to receiving terminal.
2. the method for claim 1 is characterized in that, described transmitting terminal carries out orthogonal processing to the channel gain matrix from the channel condition information of receiving terminal feedback, comprising:
Described transmitting terminal obtains the channel condition information of receiving terminal feedback;
Utilize lattice base reduction LLL algorithm that the channel gain matrix from described channel condition information is carried out lattice point and reduce processing, obtain the equivalent channel gain matrix.
3. the method for claim 1 is characterized in that, described utilization through the channel gain matrix after the orthogonal processing to constellation mapping after signal carry out nonlinear precoding, comprising:
Described equivalent channel gain matrix is decomposed, obtain feedforward matrix and feedback matrix;
Utilize feedforward matrix that the signal through the constellation mapping operation is carried out feed-forward process, and utilize feedback matrix to eliminate carrying out feedback interference through the signal after the feed-forward process.
4. the signal acceptance method of a multi-input multi-output system is characterized in that, this method may further comprise the steps:
Channel condition information is fed back to transmitting terminal;
Receive the signal that transmitting terminal sends, wherein, described signal is that transmitting terminal utilizes the channel gain matrix in the channel condition information of receiving terminal feedback to carry out nonlinear precoding through the channel gain matrix after the orthogonal processing;
To this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
5. a signal transmission system is characterized in that, this system comprises:
Transmitting terminal, be used for to signal carry out chnnel coding, interweave, scrambling and constellation mapping, and nonlinear precoding operation, and, the signal of handling is sent to channel, channel is transferred to receiving terminal;
Receiving terminal is used for channel condition information is fed back to described transmitting terminal, and, receive from the signal of the channel transmission of described transmitting terminal emission, and to this signal ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
6. system as claimed in claim 5 is characterized in that, described transmitting terminal is used to obtain the channel condition information of described receiving terminal feedback; Utilize lattice base reduction LLL algorithm that the channel gain matrix from described channel condition information is carried out lattice point and reduce processing, obtain the equivalent channel gain matrix.
7. system as claimed in claim 6 is characterized in that, described transmitting terminal is used for described equivalent channel gain matrix is decomposed, and obtains feedforward matrix and feedback matrix; Utilize feedforward matrix that the signal through the constellation mapping operation is carried out feed-forward process; Utilize feedback matrix to eliminate to carrying out feedback interference through the signal after the feed-forward process.
8. the sender unit of a multi-input multi-output system is characterized in that, this sender unit comprises:
First processing unit, be used for to signal carry out chnnel coding, interweave, scrambling and constellation mapping operation;
Second processing unit is used for the channel gain matrix from the channel condition information of receiving terminal feedback is carried out orthogonal processing;
Precoding unit is used to utilize through the signal of the channel gain matrix after the orthogonal processing after to constellation mapping and carries out nonlinear precoding;
Transmitting element is used for the signal through nonlinear precoding is sent to channel, and channel is transferred to receiving terminal.
9. emitter as claimed in claim 8 is characterized in that, described second processing unit comprises:
Acquiring unit is used to obtain the channel condition information that described receiving terminal feeds back;
The orthogonal processing unit is used for utilizing lattice base reduction LLL algorithm to reduce processing to carry out lattice point from the channel gain matrix of described channel condition information, obtains the equivalent channel gain matrix.
10. emitter as claimed in claim 8 is characterized in that, described precoding unit comprises:
Resolving cell is used for described equivalent channel gain matrix is decomposed, and obtains feedforward matrix and feedback matrix;
The feed-forward process unit is used to utilize feedforward matrix that the signal through the constellation mapping operation is carried out feed-forward process;
Feedback interference is eliminated the unit, is used to utilize feedback matrix to eliminate carrying out feedback interference through the signal after the feed-forward process.
11. the signal receiving device of a multi-input multi-output system is characterized in that, this signal receiving device comprises:
Feedback unit is used for channel condition information is fed back to transmitting terminal;
Receiving element is used to receive the signal that transmitting terminal sends, and wherein, described signal is that the channel gain matrix of transmitting terminal utilization from the channel condition information of feedback unit feedback carried out nonlinear precoding through the channel gain matrix after the orthogonal processing;
Processing unit, be used for to the signal that receiving element receives ask mould, judgement, demodulation successively, go to disturb, deinterleave, the channel decoding operation.
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| WO2016029480A1 (en) * | 2014-08-30 | 2016-03-03 | 华为技术有限公司 | Data processing apparatus and data processing method |
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Application publication date: 20110928 |