CN103634259A - Multi-antenna single carrier wave frequency division multi-address system timing synchronous parallel interference eliminating method - Google Patents
Multi-antenna single carrier wave frequency division multi-address system timing synchronous parallel interference eliminating method Download PDFInfo
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- CN103634259A CN103634259A CN201310635685.2A CN201310635685A CN103634259A CN 103634259 A CN103634259 A CN 103634259A CN 201310635685 A CN201310635685 A CN 201310635685A CN 103634259 A CN103634259 A CN 103634259A
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Abstract
A multi-antenna single carrier wave frequency division multi-address system timing synchronous parallel interference eliminating method comprises the steps that at a sending end, cyclic prefixes are inserted in the same subcarrier positions of n sending antennas, wherein the length of the cyclic prefixes needs to be smaller than the length of a data mark; a signal is transmitted by a wireless channel, a timing synchronism deviation exists, and the channel is an independent quasi-static Rayleigh flat fading multi-input-multi-output channel; at a receiving end, a received signal is processed to obtain the estimation value of an initial signal; the estimation value of the initial signal is obtained and is processed by a parallel interference eliminating technology, and a more accurate signal is obtained; the obtained more accurate signal is reprocessed by the parallel interference eliminating technology to obtain a more accurate signal. The multi-antenna single carrier wave frequency division multi-address system timing synchronous parallel interference eliminating method can more efficiently and accurately solve the problem caused by the timing deviation, and the mode for obtaining the initial value and the iteration times of the interference eliminating can be flexibly adjusted according to system demands to achieve a better system performance.
Description
Technical field
The present invention relates to many antennas single-carrier frequency division multiple access technology, be specifically related to many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method.
Background technology
Ul transmissions scheme (be called for short LTE-Advanced) is LTE(Long Term Evolution) evolution, it is not only the important sources that 3GPP forms the ITU IMT-Advanced of International Telecommunications Union technical standard, or the technology of a backward compatibility, complete compatible LTE.LTE-Advanced, with respect to LTE system, has mainly strengthened the demand of the aspects such as peak rate, propagation delay time, spectrum efficiency, VoIP capacity, system bandwidth.
LTE-Advanced ul transmissions scheme adopts many antennas single-carrier frequency division multiple access (being called for short MIMO SC-FDMA) technology, classical orthogonal frequency division multiplexi and single carrier transmission scheme are merged, there is lower peak-to-average force ratio (being called for short PAPR).Compare Multicarrier Transmission Technology, single-carrier frequency division multiple access technology can effectively reduce the peak-to-average force ratio of signal to be transmitted, thereby correspondingly improved the efficiency of power amplifier and the area coverage of increase community, this is just for development low price, low-power consumption, undersized mobile terminal provide condition.LTE-Advanced up link utilizes multiple-input and multiple-output (MIMO) technology can implementation space diversity, make space become a kind of can be for improving the resource of performance, and can increase the coverage of wireless system, effectively improve the transmission performance of system.
In wireless communication system, owing to being subject to the impact of wireless channel transmission characteristic, the timing of receiving terminal and transmitting terminal conventionally can be not quite identical, thereby cause timing slip.When there is timing slip in MIMO SC-FDMA system, it will destroy the orthogonality between subcarrier, causes disturbing (being called for short ICI) between intersymbol interference (being called for short ISI) and subcarrier, and the information sending can not correctly be recovered, the error rate increases, and systematic function reduces greatly.For digital communication system, only have transmitting terminal and receiving terminal synchronously just to have the reliability transmission of information.
For now, for SC-FDMA technology, the research maturity of this technology is far away less than OFDM (being called for short OFDMA) technology, particularly considerably less for the Timing Synchronization research of MIMO SC-FDMA system.In traditional OFDM technology Timing Synchronization algorithm, mostly first carry out rough estimate, more carefully estimate, with this, determine the original position at receiving terminal fast Fourier transform (being called for short FFT) detection window, thereby reach the object of timing synchronization.
Summary of the invention
The present invention be directed to shortcomings and deficiencies of the prior art, many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method is provided, effectively improve transmission system performance with conventional method phase specific energy.
To achieve these goals, the technical solution used in the present invention is: many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method, said method comprising the steps of:
Step 1: transmitting terminal, in individual transmitting antenna same sub-carrier location, insert Cyclic Prefix, described circulating prefix-length should be less than the length of data symbol;
Step 2: signal transmits through wireless channel, and to have Timing Synchronization deviation, described channel be the flat decline of independent quasistatic Rayleigh multi-input multi-ouput channel;
Step 3: at the receiving terminal of individual reception antenna, process to received signal, obtain the estimated value of initial stage signal;
Step 4: the estimated value of the initialize signal obtaining described in step 3 is processed through parallel interference technology for eliminating, according to the signal initial value obtaining, the signal of all antennas is reconstructed, partial summation, obtain the interference signal of current antenna, from total reception signal, interference signal is eliminated, signal after eliminating is carried out to matched filtering, judgement, obtain signal comparatively accurately;
Step 5: the signal comparatively accurately that step 4 is obtained is processed through parallel interference technology for eliminating again, the signal comparatively accurately that is about to step 4 acquisition is reconstructed again, partial summation, obtain the interference signal of current antenna, from described signal comparatively accurately, interference signal is eliminated, signal after elimination carries out matched filtering, judgement, obtains signal more accurately.
The method that obtains initial stage Signal estimation value in described step 3 adopts the compound mode of the methods such as method that the QR of transmission matrix decomposes or linear ZF, least mean-square error and serial interference elimination and said method thereof to obtain.
The method of described transmission Matrix QR Decomposition is at receiving terminal, transmission matrix is carried out to QR decomposition transform, the unitary matrice obtaining and the product of upper triangular matrix, use the conjugate matrices matrix premultiplication of Q matrix to receive vector, the reception vector that is improved, by the initial value of judgement picked up signal.
Described Cyclic Prefix is the part that copies of every frame data symbol afterbody, and its length is less than every frame data symbol lengths, forms transmission frame send by antenna with data symbol.
The flat decline of described independent quasistatic Rayleigh multi-input multi-ouput channel, its element is the multiple Gaussian random variable that independent identically distributed average is 0, variance is, noise is the additive white Gaussian noise that average is zero, variance is.
At the receiving terminal of signal, the sample frequency that receives signal with carrier frequency all without being offset, and without channel estimation bias.
At signal sending end, all transmitting antennas use same local oscillator.
At signal receiving end, all reception antennas are used same local oscillator.
Beneficial effect of the present invention is: the method makes full use of many antennas single carrier-frequency division multiple access system characteristics and advantages and interference cancellation techniques, can be more efficiently and solve accurately the problem that timing offset brings, the iterations that the mode that can obtain according to system requirements flexible initial value and interference are eliminated simultaneously, reach better systematic function, simultaneously, method provided by the invention compared with the conventional method, the structure of energy simplified receiver, the complexity and the cost that reduce receiver, have good practicality.
Accompanying drawing explanation
Fig. 1 is many antennas single-carrier frequency division multiple access technology overall system diagram of the present invention.
Fig. 2 is the block diagram that single-carrier frequency division multiple access symbol of the present invention inserts Cyclic Prefix.
Fig. 3 is that QR of the present invention decomposes the block diagram that detects the elimination of associating parallel interference.
Fig. 4 is that QR of the present invention decomposes the detailed structure block diagram detecting.
Fig. 5 is the detailed structure block diagram of parallel interference removing method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but embodiments of the present invention are not limited to this.
As shown in Figure 1, in figure, reflected accurately that many antennas single-carrier frequency division multiple access (being called for short MIMO SC-FDMA) technology is when sending and receiving signal, the all processes that signal is processed, comprise: single-carrier frequency division multiple access (being called for short SC-FDMA) modulator-demodulator, discrete Fourier transform/inverse discrete Fourier transform (being called for short DFT/IDFT), interpolation, detection and the interference eliminator etc. of the interpolation of Cyclic Prefix (being called for short CP) and removal, timing slip.
As shown in Figure 2, SC-FDMA symbol inserts cyclic prefix CP, and cyclic prefix CP length should be less than the length of data symbol DATA, adds cyclic prefix CP and can resist multidiameter delay, and meanwhile, the interpolation of Cyclic Prefix and the present invention add timing slip direct relation.
As shown in Figure 3, the signal receiving and transmission matrix are carried out to QR decomposition detection, as the first step, improve the precision of signal initial value; Then second step parallel interference elimination algorithm adopts parallel mode to eliminate intersymbol interference,, after all signals are detected, interference is eliminated from receive signal, further to improve the performance of MIMO SC-FDMA system simultaneously.
As shown in Figure 4, QR decomposes detector and comprises: conjugate transpose device, multiplier, cumulative summer, adder, decision device, by transmission matrix is carried out to QR decomposition transform, the unitary matrice obtaining and the product of upper triangular matrix, use the conjugate matrices premultiplication of Q to receive vector, the reception vector that is improved, by the initial value of judgement picked up signal.
As shown in Figure 5, parallel interference canceller comprises: multiplier, cumulative summer, subtracter, conjugate transpose device, matched filter, decision device, according to the signal initial value obtaining, the signal of all antennas is reconstructed, partial summation, obtain the interference signal of current antenna, from total reception signal, interference signal is deducted to elimination afterwards, the signal after elimination carries out matched filtering, judgement, obtains signal comparatively accurately.
Above-described embodiments of the present invention, do not form limiting the scope of the present invention.Any modification of having done within spiritual principles of the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (8)
1. more than antenna single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method, is characterized in that, said method comprising the steps of:
Step 1: transmitting terminal, in individual transmitting antenna same sub-carrier location, insert Cyclic Prefix, described circulating prefix-length should be less than the length of data symbol;
Step 2: signal transmits through wireless channel, and to have Timing Synchronization deviation, described channel be the flat decline of independent quasistatic Rayleigh multi-input multi-ouput channel;
Step 3: at the receiving terminal of individual reception antenna, process to received signal, obtain the estimated value of initial stage signal;
Step 4: the estimated value of the initialize signal obtaining described in step 3 is processed through parallel interference technology for eliminating, according to the signal initial value obtaining, the signal of all antennas is reconstructed, partial summation, obtain the interference signal of current antenna, from total reception signal, interference signal is eliminated, signal after eliminating is carried out to matched filtering, judgement, obtain signal comparatively accurately;
Step 5: the signal comparatively accurately that step 4 is obtained is processed through parallel interference technology for eliminating again, the signal comparatively accurately that is about to step 4 acquisition is reconstructed again, partial summation, obtain the interference signal of current antenna, from described signal comparatively accurately, interference signal is eliminated, signal after elimination carries out matched filtering, judgement, obtains signal more accurately.
2. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1, is characterized in that: the method that obtains initial stage Signal estimation value in described step 3 adopts the method that the QR of transmission matrix decomposes or adopts the compound mode of linear ZF, least mean-square error and method for eliminating serial interference and said method thereof to obtain.
3. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1 or 2, it is characterized in that: the method for the transmission Matrix QR Decomposition that described acquisition initial stage Signal estimation value adopts is at receiving terminal, transmission matrix is carried out to QR decomposition transform, the unitary matrice obtaining and the product of upper triangular matrix, use the conjugate matrices matrix premultiplication of Q matrix to receive vector, the reception vector that is improved, by the initial value of judgement picked up signal.
4. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1, it is characterized in that: described Cyclic Prefix is the part that copies of every frame data symbol afterbody, its length is less than every frame data symbol lengths, forms transmission frame send by antenna with data symbol.
5. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1, it is characterized in that: the described flat decline of independent quasistatic Rayleigh multi-input multi-ouput channel, its modeling element is the multiple Gaussian random variable that independent identically distributed average is 0, variance is, noise is the additive white Gaussian noise that average is zero, variance is.
6. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1, is characterized in that: at signal receiving end, the sample frequency that receives signal with carrier frequency all without being offset, and without channel estimation bias.
7. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1, is characterized in that: at signal sending end, all transmitting antennas use same local oscillator.
8. many antennas single carrier-frequency division multiple access system Timing Synchronization parallel interference removing method as claimed in claim 1, is characterized in that: at signal receiving end, all reception antennas are used same local oscillator.
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Cited By (4)
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| CN104486274A (en) * | 2014-12-11 | 2015-04-01 | 广东工业大学 | Method for transmitting signal for multi-antenna single-carrier frequency division multiple access system |
| CN105282071A (en) * | 2015-11-06 | 2016-01-27 | 哈尔滨工业大学 | Weighted fractional Fourier transform domain spread-spectrum signal parallel interference elimination error correction method |
| CN105591845A (en) * | 2016-03-08 | 2016-05-18 | 哈尔滨工业大学 | SC-FDMA uplink inter-cell interference inhibition method based on time-variable filtering |
| TWI650971B (en) * | 2018-03-01 | 2019-02-11 | 晨星半導體股份有限公司 | Carrier frequency offset estimation device and carrier frequency offset estimation method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104486274A (en) * | 2014-12-11 | 2015-04-01 | 广东工业大学 | Method for transmitting signal for multi-antenna single-carrier frequency division multiple access system |
| CN104486274B (en) * | 2014-12-11 | 2018-03-09 | 广东工业大学 | A kind of method for transmitting signals of multiple antennas single carrier-frequency division multiple access system |
| CN105282071A (en) * | 2015-11-06 | 2016-01-27 | 哈尔滨工业大学 | Weighted fractional Fourier transform domain spread-spectrum signal parallel interference elimination error correction method |
| CN105282071B (en) * | 2015-11-06 | 2019-04-09 | 哈尔滨工业大学 | Weighted score Fourier transform domain spread-spectrum signal parallel interference canceller mistake modification method |
| CN105591845A (en) * | 2016-03-08 | 2016-05-18 | 哈尔滨工业大学 | SC-FDMA uplink inter-cell interference inhibition method based on time-variable filtering |
| CN105591845B (en) * | 2016-03-08 | 2018-10-09 | 哈尔滨工业大学 | SC-FDMA uplink inter-cell interference suppressing methods based on time-variable filtering |
| TWI650971B (en) * | 2018-03-01 | 2019-02-11 | 晨星半導體股份有限公司 | Carrier frequency offset estimation device and carrier frequency offset estimation method |
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Application publication date: 20140312 |