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Combined evaluation method for channel step number and multiple path time delay

A technology of multipath delay and joint estimation, which is applied in the field of wireless transmission and can solve the problems of difficult and extensive application and high computational complexity.

Inactive Publication Date: 2005-03-02
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the computational complexity of this estimator is very high, especially in the process of channel order estimation and multipath delay detection, which requires a very complex matrix operation, making it difficult to be widely used

Method used

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Embodiment Construction

[0014] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0015] Take a 2-transmit and 2-receive MIMO-OFDM system as an example. The system works in an outdoor environment with a channel bandwidth of 20MHz and a number of subcarriers of 1024. The channel is a multipath Rayleigh fading channel, the number of channel multipaths is 5, the delay is [0,50,100,150,200], the maximum multipath delay spread is 200 (10us), and the power delay distribution obeys exponential decay. During data transmission, pilot symbols are discretely inserted into each frame of data for channel estimation. Since there is a channel between each pair of transmit-receive antennas, each channel estimation result actually contains estimates of 4 channels. The steps of the present invention to jointly estimate the channel order and multipath delay are as follows:

[0016] 1) n=1, 2,..., n means the multipath delay of the nth symbol is estimated. Crea...

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Abstract

This invention relates to a joint evaluation method for channel step number and multipath time delay in a wireless transmission field which designs a pair of initial up and down margins for channel steps then to evaluate the multipath time delay, take the time delay tested at the lower margin as the time delay evaluation value and use the checked results of the last few times to test the correctness of the time delays within the up and down margins, if they are close to the results, they are too the evaluation value, otherwise it is seen to be false. The up and down margins of the channel steps are re-determined according to the test results and taken as the base of evaluation next time, to realize the joint test and real-time tracing by repeating the same thing.

Description

Technical field [0001] The invention relates to a joint estimation method of channel order and multipath delay in the field of wireless transmission, in particular to a joint order detection and multipath delay estimation method for a time domain multipath channel of a wireless communication system. Background technique [0002] At present, the next three generations of mobile communication systems under study in various countries intend to adopt multiple input multiple output (MIMO) technology and orthogonal frequency division multiplexing (OFDM) technology. These technologies can effectively increase system capacity and better combat harsh mobile channels. It can provide a physical layer platform for realizing high data rate mobile communications. Channel estimation is one of the key technologies of MIMO-OFDM system, divided into two categories: time domain estimation and frequency domain estimation. Since the variables to be estimated in time domain estimation are much less th...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 侯晓赟徐友云张海滨罗汉文宋文涛
Owner SHANGHAI JIAO TONG UNIV
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