A signal estimation method for layered demodulation of multi-input and multi-output system
A signal estimation, multi-output technology, applied in the field of signal estimation, can solve the problem of not finding public information, and achieve the effect of simple calculation and accurate estimation
Inactive Publication Date: 2009-11-18
ZTE CORP
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[0020] The principles and steps of the above-mentioned layered demodulation algorithm, especially the V-BLAST algorithm, have been disclosed, and are well known to scholars working in related fields, but for one of the important steps of the layered demodulation algorithm—especially V-BLAST Step (7) of the BLAST algorithm
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What specific method is used to achieve it, and no public specific implementation method has been found so far
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[0057] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0058] The method of the present invention comprises:
[0059] The first step, initialization: determine the amplitude factor; determine the first symbol of the estimated signal according to the first symbol of the current layer signal; reset the phase error statistics;
[0060] In the second step, the current symbol is demodulated by the existing estimated signal symbol (and the current layer signal symbol);
[0061] In the third step, the current estimated signal symbol is remodulated by the demodulation result to obtain a new estimated signal symbol;
[0062] The fourth step is to calculate the phase error between the new estimated signal symbol and the corresponding current layer signal symbol;
[0063] The fifth step is to low-pass filter the phase error and update the phase error statistics;
[0064] The sixth step is to eliminat...
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The invention discloses a signal estimation method used in multi-input multi-output system layered demodulation, comprising: 1. determining the amplitude factor; determining the first symbol of the estimated signal according to the first symbol of the current layer signal; 2. Demodulate the current symbol; 3. Re-modulate the current estimated signal symbol to obtain a new estimated signal symbol; 4. Calculate the difference between the new estimated signal symbol and the corresponding current layer signal symbol Phase error; 5. Low-pass filtering the phase error to update the phase error statistic; 6. Eliminating the phase error statistic updated through low-pass filtering from the new estimated signal symbol; 7. Judging whether the symbol of the current layer signal has been processed, If the processing is complete, the method ends, otherwise, go to step 2. The estimated signal obtained by the invention can be directly used in the layered demodulation algorithm, and has the obvious advantages of simple calculation, accurate estimation, and allowing the current layer signal to contain frequency offset.
Description
technical field [0001] The present invention relates to a signal estimation method in layered demodulation of a multi-input multi-output wireless communication system, in particular to a multi-input multi-output wireless communication system V-BLAST (Vertical Bell Laboratories Layered Space-Time, Vertical Bell Laboratories Layered Space-Time) Signal Estimation Method in Layered Demodulation Algorithms. Background technique [0002] Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) technology is a major breakthrough in smart antenna technology in the field of wireless mobile communications. It transmits independent signals on different antennas at the same time, that is, spatial multiplexing technology, to make full use of spatial channels. The dispersion characteristics of the communication system can double the capacity and spectrum utilization of the communication system without increasing the bandwidth. [0003] Multiple-input multiple-output technolo...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 王剑王文杰辛胜利
Owner ZTE CORP