CN102148779B - Method and device for detecting signals - Google Patents

Method and device for detecting signals Download PDF

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CN102148779B
CN102148779B CN 201110067978 CN201110067978A CN102148779B CN 102148779 B CN102148779 B CN 102148779B CN 201110067978 CN201110067978 CN 201110067978 CN 201110067978 A CN201110067978 A CN 201110067978A CN 102148779 B CN102148779 B CN 102148779B
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signal
signals
channel estimating
discontinuous
multinomial
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戴晓明
黄琛
唐胜志
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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Abstract

The invention discloses a method for detecting signals, which is used for simplifying a realization process of signal detection and reducing complicatedness of the signal detection. The method comprises the steps of respectively carrying out signal estimation on two discontinuous signals to obtain estimated channel values; constructing an estimated channel polynomial of each one of the two signals according to a signal detection algorithm by using the estimated channel value of the signal; obtaining an estimated channel polynomial of a middle signal between the two signals according to the estimated channel polynomials of the two signals by means of an interpolation algorithm; and obtaining a signal detection result of the middle signal according to the estimated channel polynomial of the middle signal. The invention also discloses a device for realizing the method.

Description

A kind of method of input and device
Technical field
The present invention relates to the communications field, particularly relate to the method and the device of input.
Background technology
Along with the rapid growth of number of mobile phone users in the global range and continuing to bring out of novel radio multimedia service, how on limited frequency spectrum resources, to satisfy the ever-increasing broadband radio multi-media business demand of people, become the key problem that new generation of wireless communication system LTE (Long Term Evolution) system needs to be resolved hurrily.(Multiple-Input Multiple-Output, MIMO) technology can improve the transmission rate of wireless communication system to multiple-input and multiple-output significantly.(Orthogonal Frequency Division Multiplexing, OFDM) technology contrary frequency selectivity decline effectively reduces the channel equalization complexity to OFDM.The MIMO-OFDM technology that the two combines make full use of sky, the time, resource frequently, can satisfy the demand of LTE system.
Traditional MIMO signal based on demixing time space, synchronized transmissions and reception on each antenna.The receiving terminal of this synchronized transmissions MIMO need carry out input.Detection algorithm comprises following a few class: the one, and desirable maximal possibility estimation (Maximumlike-lihood, ML) detection algorithm, the 2nd, the linearity test algorithm of standard comparatively, as ZF (ZF) algorithm, least mean-square error (MMSE) algorithm, three are based on the detection algorithm of interference eliminated, as serial interference elimination (Successive interference cancellation, SIC) algorithm.
Signal detection process mainly is to utilize as above detection formula that the channel estimating information that each RE (least resource unit) obtains is inverted and multiplying.Obviously, each RE is carried out so complicated calculating, its amount of calculation is bigger, influences the efficient of input.
Summary of the invention
The embodiment of the invention provides a kind of method and device of input, is used to simplify the implementation procedure of input, reduces the complexity of input.
A kind of method of input may further comprise the steps:
Discontinuous two signals are carried out channel estimating respectively, obtain channel estimation value;
At each signal in described two signals, construct the channel estimating multinomial of this signal with the channel estimation value of this signal according to signal detection algorithm;
M signal between described two signals utilizes interpolation algorithm, obtains the channel estimating multinomial of this M signal according to the channel estimating multinomial of described two signals;
Obtain the signal detecting result of this M signal according to the channel estimating multinomial of described M signal.
A kind of device that is used for input comprises:
Channel estimation module is used for discontinuous two signals are carried out channel estimating respectively, obtains channel estimation value;
Constructing module is used for each signal at described two signals, constructs the channel estimating multinomial of this signal with the channel estimation value of this signal according to signal detection algorithm;
Interpolating module is used for utilizing interpolation algorithm at the M signal between described two signals, obtains the channel estimating multinomial of this M signal according to the channel estimating multinomial of described two signals;
Detection module is used for obtaining according to the channel estimating multinomial of described M signal the signal detecting result of this M signal.
The embodiment of the invention adopts existing signal detection algorithm to detect to discontinuous a plurality of signals, to the signal between this discontinuous signal, utilize the detection median of interpolation algorithm and discontinuous signal to detect, because the complexity of interpolation algorithm is far below signal detection algorithm, therefore simplify the implementation procedure of input, reduce the complexity of input.
Description of drawings
Fig. 1 is the main method flow chart of input in the embodiment of the invention;
Fig. 2 carries out the method flow diagram of input for the detection median of utilizing discontinuous signal on linear interpolation algorithm and the time domain in the embodiment of the invention;
Fig. 3 carries out the method flow diagram of input for the detection median of utilizing discontinuous signal on linear interpolation algorithm and the frequency domain in the embodiment of the invention;
The structure chart of Fig. 4 for installing in the embodiment of the invention;
Fig. 5 is simulated effect figure in the embodiment of the invention.
Embodiment
The embodiment of the invention adopts existing signal detection algorithm to detect to discontinuous a plurality of signals, to the signal between this discontinuous signal, utilize the detection median of interpolation algorithm and discontinuous signal to detect, because the complexity of interpolation algorithm is far below signal detection algorithm, therefore simplify the implementation procedure of input, reduce the complexity of input.
Referring to Fig. 1, the main method flow process of input is as follows in the present embodiment:
Step 101: discontinuous two signals are carried out channel estimating respectively, obtain channel estimation value.
Step 102:, construct the channel estimating multinomial of this signal with the channel estimation value of this signal according to signal detection algorithm at each signal in discontinuous two signals.
Step 103: the M signal between discontinuous two signals, utilize interpolation algorithm, obtain the channel estimating multinomial of this M signal according to the channel estimating multinomial of discontinuous two signals.The channel estimating multinomial is the part except that received signal in the signal detection algorithm in the present embodiment.With the ZF detection algorithm is example, to the testing result of the last k sub-carrier signal of n OFDM (OFDM) symbol (hereinafter to be referred as symbol) H wherein NkBe channel estimation value, W is the channel estimating multinomial, () HThe expression conjugate transpose, () -1Representing matrix contrary.
Step 104: the testing result that obtains M signal according to the channel estimating multinomial of M signal.
Discontinuous two signals are discontinuous two signals on the time domain in the present embodiment, or are discontinuous two signals on the frequency domain.And interpolation algorithm comprises linear interpolation algorithm etc.Introduce implementation procedure in detail below by several embodiment.
Referring to Fig. 2, it is as follows to utilize the detection median of discontinuous signal on linear interpolation algorithm and the time domain to carry out the method flow of input in the present embodiment:
Step 201: utilize signal detection algorithm that 1～m+1 sub-carrier signal on n the symbol is carried out input, obtain the channel estimating multinomial and the testing result of 1～m+1 sub-carrier signal.Signal detection algorithm comprises ZF (ZF) algorithm and least mean-square error (MMSE) algorithm etc., and any algorithm that is used for detection signal all is applicable to present embodiment.Wherein, the channel estimating multinomial can be expressed as: and P (k, n), k≤m+1, (k n) is the channel estimating multinomial of k sub-carrier signal on n the symbol to P, and m is a sub-carrier number at interval.
Step 202: utilize signal detection algorithm that k+1～k+m sub-carrier signal on n the symbol is carried out input, obtain the channel estimating multinomial and the testing result of k+1～k+m sub-carrier signal.
Step 203: (k＞m+1) sub-carrier signal carries out channel estimating to k on n the symbol.In step 201 and 202 signal detection process, also need 1～m+1 sub-carrier signal and k+1～k+m sub-carrier signal are carried out channel estimating, therefore the process of in the step 203 the k signal being carried out channel estimating can be carried out synchronously with the process of 1～m+1 sub-carrier signal and k+1～k+m sub-carrier signal being carried out channel estimating, and perhaps the sequencing according to received signal carries out.
Step 204: utilize linear interpolation algorithm, obtain the channel estimating multinomial of k sub-carrier signal according to the channel estimating multinomial of k-m sub-carrier signal and k+m sub-carrier signal.The channel estimating multinomial of k signal can be expressed as
Figure BDA0000051298270000041
K＞m+1.
Step 205: utilize signal detection algorithm, obtain the testing result of k sub-carrier signal according to the channel estimating multinomial of k sub-carrier signal.Testing result is P (k, n) r Nk
Referring to Fig. 3, it is as follows to utilize the detection median of discontinuous signal on linear interpolation algorithm and the frequency domain to carry out the method flow of input in the present embodiment:
Step 301: utilize signal detection algorithm to p 1Last k sub-carrier signal carries out input, obtains p 1The channel estimating multinomial and the testing result of last k sub-carrier signal.Signal detection algorithm comprises ZF (ZF) algorithm and least mean-square error (MMSE) algorithm etc., and any algorithm that is used for detection signal all is applicable to present embodiment.Wherein, p 1The channel estimating multinomial of last k sub-carrier signal can be expressed as: w 1(p 1, k).
Step 302: utilize signal detection algorithm to p 2Last k sub-carrier signal carries out input, obtains p 2The channel estimating multinomial w of last k sub-carrier signal 2(p 2, k) and testing result.
Step 303: k sub-carrier signal on n the symbol carried out channel estimating.In step 301 and 302 signal detection process, also need p 1Last k sub-carrier signal and p 2Last k sub-carrier signal carries out channel estimating, thus in the step 303 to k sub-carrier signal on n the symbol carry out channel estimating process can with to p 1And p 2The process that last k sub-carrier signal carries out channel estimating is carried out synchronously, and perhaps the sequencing according to symbol carries out.Wherein, p 1Be the symbol at a n symbol row pilot tone place before, p 2It is the symbol at a n symbol row pilot tone place afterwards.
Step 304: utilize linear interpolation algorithm, according to p 1And p 2The channel estimating multinomial of last k sub-carrier signal obtains the channel estimating multinomial of k sub-carrier signal on n the symbol.The channel estimating multinomial of k sub-carrier signal can be expressed as on n symbol W ( n , k ) = p 2 - n p 2 - p 1 w 1 ( p 1 , k ) + n - p 1 p 2 - p 1 w 2 ( p 2 , k ) .
Step 305: utilize signal detection algorithm, obtain the testing result of k signal according to the channel estimating multinomial of k signal.Testing result is W (n, k) r Nk
More than described the implementation procedure of input, this process can realize that internal structure and the function to this device is introduced below by device.
Referring to Fig. 4, the device that is used for input in the present embodiment comprises: channel estimation module 401, constructing module 402, interpolating module 403 and detection module 404.
Channel estimation module 401 is used for discontinuous two signals are carried out channel estimating respectively, obtains channel estimation value.Discontinuous two signals are discontinuous two signals on the time domain, or are discontinuous two signals on the frequency domain.
Constructing module 402 is used for each signal at discontinuous two signals, constructs the channel estimating multinomial of this signal with the channel estimation value of this signal according to signal detection algorithm.Signal detection algorithm comprises ZF ZF algorithm and least mean-square error MMSE algorithm.
Interpolating module 403 is used for utilizing interpolation algorithm at the M signal between discontinuous two signals, obtains the channel estimating multinomial of this M signal according to the channel estimating multinomial of discontinuous two signals.Interpolation algorithm comprises linear interpolation algorithm etc.Discontinuous two signals are on the frequency domain during discontinuous two signals, and interpolating module 403 utilizes linear interpolation algorithm, passes through formula
Figure BDA0000051298270000061
Obtain the channel estimating multinomial of M signal, this M signal is k sub-carrier signal on n the symbol, and (k n) is the channel estimating multinomial of k sub-carrier signal on n the symbol to P, and m is a sub-carrier number at interval.Discontinuous two signals are on the time domain during discontinuous two signals, and interpolating module 403 utilizes linear interpolation algorithm, passes through formula
Figure BDA0000051298270000062
Obtain the channel estimating multinomial of M signal, this M signal is k sub-carrier signal on n the symbol, w 1And w 2Be discontinuous two signals, p 1And p 2Be respectively the symbol at the first row pilot tone and secondary series pilot tone place.
Detection module 404 is used for obtaining according to the channel estimating multinomial of M signal the testing result of M signal.
The embodiment of the invention adopts existing signal detection algorithm to detect to discontinuous a plurality of signals, to the signal between this discontinuous signal, utilize the detection median of interpolation algorithm and discontinuous signal to detect, because the complexity of interpolation algorithm is far below signal detection algorithm, therefore simplify the implementation procedure of input, reduce the complexity of input, can obtain being similar to the complexity of existing algorithm 1/6.And, signal detection performance and prior art are approaching, referring to shown in Figure 5, simulated environment is: 20M-50PRB-1X8RX-SCME-B-120KM/H-MCS28, the meaning is under the 20M bandwidth 50 Physical Resource Block to be carried out emulation, adopts 1 transmit antennas and 8 reception antennas, and the channel of emulation is SCME-B (dedicated channel moves an expansion category-B type) channel, transmission rate adopts 120 kilometer per hours, and modulation coding mode adopts MCS28.Line 501 is for passing through prior art, the result who all adopts signal detection algorithm to detect to all signals, the result of line 502 for adopting interpolation algorithm to detect to part signal in the embodiment of the invention, obviously line 501 overlaps substantially with line 502, signal detection performance and prior art that the embodiment of the invention is described are approaching, and complexity obviously reduces.Discontinuous two signals are discontinuous two signals on the time domain, or are discontinuous two signals on the frequency domain.The embodiment of the invention provides detailed implementation respectively at both of these case, realizes more flexibly, and applied environment is extensive, can be applicable to the various wireless communication system, and is not limited to the employed TD-LTE of this paper system.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
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 (10)

1. the method for an input is characterized in that, may further comprise the steps:
Discontinuous two signals are carried out channel estimating respectively, obtain channel estimation value;
At each signal in described two signals, construct the channel estimating multinomial of this signal with the channel estimation value of this signal according to signal detection algorithm;
M signal between described two signals utilizes interpolation algorithm, obtains the channel estimating multinomial of this M signal according to the channel estimating multinomial of described two signals;
Obtain the signal detecting result of this M signal according to the channel estimating multinomial of described M signal.
2. the method for claim 1 is characterized in that, discontinuous two signals are discontinuous two signals on the time domain, or is discontinuous two signals on the frequency domain.
3. method as claimed in claim 1 or 2 is characterized in that interpolation algorithm comprises linear interpolation algorithm.
4. method as claimed in claim 3, it is characterized in that, discontinuous two signals are on the frequency domain during discontinuous two signals, utilize interpolation algorithm, the polynomial step of channel estimating that obtains this M signal according to the channel estimating multinomial of described two signals comprises: utilize linear interpolation algorithm, by public affairs Obtain the channel estimating multinomial of M signal, this M signal is k sub-carrier signal on n the symbol, and (k n) is the channel estimating multinomial of k sub-carrier signal on n the symbol to P, and m is a sub-carrier number at interval;
Discontinuous two signals are on the time domain during discontinuous two signals, utilize interpolation algorithm, and the polynomial step of channel estimating that obtains this M signal according to the channel estimating multinomial of described two signals comprises: utilize linear interpolation algorithm, pass through formula
Figure FDA0000051298260000012
Obtain the channel estimating multinomial of M signal, this M signal is k sub-carrier signal on n the symbol, w 1Be the channel estimating multinomial of a signal in discontinuous two signals, w 2Be the channel estimating multinomial of another signal in discontinuous two signals, p 1And p 2Be respectively the symbol at the first row pilot tone and secondary series pilot tone place.
5. the method for claim 1 is characterized in that, signal detection algorithm comprises ZF ZF algorithm and least mean-square error MMSE algorithm.
6. a device that is used for input is characterized in that, comprising:
Channel estimation module is used for discontinuous two signals are carried out channel estimating respectively, obtains channel estimation value;
Constructing module is used for each signal at described two signals, constructs the channel estimating multinomial of this signal with the channel estimation value of this signal according to signal detection algorithm;
Interpolating module is used for utilizing interpolation algorithm at the M signal between described two signals, obtains the channel estimating multinomial of this M signal according to the channel estimating multinomial of described two signals;
Detection module is used for obtaining according to the channel estimating multinomial of described M signal the signal detecting result of this M signal.
7. device as claimed in claim 6 is characterized in that, discontinuous two signals are discontinuous two signals on the time domain, or is discontinuous two signals on the frequency domain.
8. as claim 6 or 7 described devices, it is characterized in that interpolation algorithm comprises linear interpolation algorithm.
9. device as claimed in claim 8 is characterized in that, discontinuous two signals are on the frequency domain during discontinuous two signals, and interpolating module utilizes linear interpolation algorithm, passes through formula
Figure FDA0000051298260000021
Obtain the channel estimating multinomial of M signal, this M signal is k sub-carrier signal on n the symbol, and (k n) is the channel estimating multinomial of k sub-carrier signal on n the symbol to P, and m is a sub-carrier number at interval;
Discontinuous two signals are on the time domain during discontinuous two signals, and interpolating module utilizes linear interpolation algorithm, passes through formula Obtain the channel estimating multinomial of M signal, this M signal is k sub-carrier signal on n the symbol, w 1Be the channel estimating multinomial of a signal in discontinuous two signals, w 2Be the channel estimating multinomial of another signal in discontinuous two signals, p 1And p 2Be respectively the symbol at the first row pilot tone and secondary series pilot tone place.
10. device as claimed in claim 6 is characterized in that, signal detection algorithm comprises ZF ZF algorithm and least mean-square error MMSE algorithm.
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CN103944846B (en) * 2013-01-17 2017-04-12 展讯通信（上海）有限公司 Orthogonal frequency division multiplexing system and channel estimation method thereof

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CN101166171A (en) * 2007-07-18 2008-04-23 电子科技大学 A time change channel estimating method for OFDM system
CN101588335A (en) * 2008-05-19 2009-11-25 三星电子株式会社 Utilize the MIMO detection method and the system of channel relevancy

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