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Path selecting method in time domain multipath channel evaluation

A technology for multipath path and channel estimation, applied in the field of information transmission technology in applications, can solve problems such as instability, and achieve the effects of improving accuracy, simple implementation, and improved accuracy

Inactive Publication Date: 2008-01-16
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

This method is also a practical method, but the selection of the threshold depends on the noise variance estimation accuracy, which has great instability

Method used

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Embodiment Construction

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

[0015] Taking a MIMO-OFDM system with 4 transmissions and 4 receptions as an example, each OFDM frame contains 12 pilot symbols, and a channel estimation result can be obtained at each pilot symbol position, since each pair of transmit-receive There is a channel between the antennas, so each channel estimation result actually includes the estimation of 16 channels. Assuming that the maximum multipath length of the channel is 216, the steps of path selection in the present invention are as follows:

[0016] 1) Determine the maximum number N of effective multipath paths in the channel, the estimated result cache depth M, and the minimum effective path threshold v, and create a vote counting sequence S(n) whose length is equal to the maximum multipath length L of the channel and a length equal to M energy sequences P(m, n) of L, m=1, 2, . . . M, n=1, 2, . ....

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Abstract

This invention relates to a path selection method in a time domain multipath channel evaluation, first of all, preserving the latest M channel evaluation results then to select N multipath in the maximum energy from the M evaluated results according to the largest number N of the valid multipath in the predetermined channels, then selecting the N multipath positions appeared mostly finally to determine the valid multipath not more than N corresponding to the M evaluation results.

Description

technical field [0001] The invention relates to a path selection method in time-domain multi-path channel estimation, which can perform effective path selection for time-domain channel estimation of a wireless communication system, and belongs to the field of wireless transmission of information, especially in applications such as mobile communication and digital television. information transmission technology. Background technique [0002] Channel estimation in wireless communication systems can be divided into time-domain estimation and frequency-domain estimation according to the given channel. The former gives the channel estimation characteristics in the time domain, and the latter gives the channel estimation characteristics in the frequency domain. Taking the MIMO-OFDM (Multiple Input Multiple Output - Orthogonal Frequency Division Multiplexing) system as an example, for frequency domain channel estimation, the channel length obtained has nothing to do with the multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/04H04L25/02H04L69/14
Inventor 陈洁君管华亮侯晓贇宋文涛徐友云
Owner SHANGHAI JIAOTONG UNIV
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