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Method for signal dark sending and channel tracking for MIMO system training

A training signal and channel tracking technology, which is applied in the field of mobile communication, can solve the problems of estimated channel update not keeping up, communication quality degradation, time resource occupation, etc.

Inactive Publication Date: 2006-03-22
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

Sending these training signals takes up the time resources of sending signals. For complex wireless channels, sending training signals may take about 20% of the time
On the other hand, using this framework to send training signals, channel estimation can only be performed in the time segment of sending training signals
For fast-changing time-varying channels, it is possible that the estimated channel update cannot keep up, resulting in a decrease in communication quality

Method used

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  • Method for signal dark sending and channel tracking for MIMO system training
  • Method for signal dark sending and channel tracking for MIMO system training
  • Method for signal dark sending and channel tracking for MIMO system training

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Embodiment

[0066] The present invention comprises the steps:

[0067] (1) Construction of training signal:

[0068] Taking two input transmitting antennas and two receiving antennas as an example, the construction method of the training signal is given. For the construction method of 2-input 2-output system. First construct two orthogonal sequences

[0069] d 1 =(1,1,-1,-1),

[0070] d 2 =(1,-1,1,-1).

[0071] These two sequences satisfy the orthogonality condition. Given that the length of the time segment is N, then the orthogonal training signal constructed by these two sequences is

[0072] p 1 = Td 1 ,

[0073] p 2 = Td 2 .

[0074] Where T is a row vector with length N and each element is 1, and the symbol  represents Kronecker's matrix product. If N=4, then there are

[0075] p 1 =(1,1,1,1,1,1,1,1,-1,-1,-1,-1,-1,-1,-1,-1),

[0076] p 2 =(1,1,1,1,-1,-1,-1,-1,...

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Abstract

A secrete delivery and channel tracking method for MIMO system training signal, which contains adding 1 or - 1 constant vector to segment by linear aliasing mode utilizing zero mean value property of sent signal, in received signal of receiving end, estimating wireless channel through mean value of received signal in said time segment. Said invention reduces time to send signal and raises channel updating speed.

Description

technical field [0001] The present invention relates to a method in the technical field of mobile communication, in particular, a method for secret transmission of training signals and channel tracking of a MIMO (Multiple Input Multiple Output) system Background technique [0002] In order to adapt to the ever-increasing demands of data and multimedia services, the new generation of mobile communication systems has put forward higher requirements for communication information throughput, quality, and reliability. With the development of mobile communication and satellite communication, the contradiction between the rapid increase of mobile communication traffic and the limited spectrum resources has become increasingly prominent. How to make more effective use of the limited spectrum resources and improve the general efficiency is a key issue faced by the new generation of mobile communication systems. Smart Antenna (Smart Antenna, SA) based on the multiple-input multiple-o...

Claims

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Application Information

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IPC IPC(8): H04L25/02
Inventor 张丽清
Owner SHANGHAI JIAO TONG UNIV
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