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Method for filtering time domain channel response noises

A time-domain channel response and channel impulse response technology, which is applied to the shaping network in the transmitter/receiver, baseband system components, multi-frequency code system, etc., to achieve the effect of less resource occupation, easy implementation, and simple processing

Active Publication Date: 2012-05-02
WUXI JINGXIN MICRO ELECTRONICS CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to propose a method for filtering time-domain channel response noise, the technical problem to be solved is: can filter out most of the channel response noise

Method used

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  • Method for filtering time domain channel response noises
  • Method for filtering time domain channel response noises
  • Method for filtering time domain channel response noises

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Embodiment Construction

[0036] In an embodiment, the method for filtering time-domain channel response noise includes the following steps:

[0037] Step 1: Receive the current frame signal, and separate the pseudo-random sequence PN and the OFDM frame body to eliminate the corresponding inter-symbol interference and inter-symbol interference;

[0038] Step 2: Fill the received pseudo-random sequence with zeros to 2048 points, and perform FFT transformation;

[0039] Step 3: Obtain the original pseudo-random sequence of the current frame, also pad zero to 2048 points, and perform FFT transformation;

[0040] Step 4: According to the time-domain-frequency-domain conversion relationship of the linear convolution relationship, and use the MMSE frequency-domain filtering algorithm to effectively eliminate part of the noise and obtain the initial time-domain channel impulse response;

[0041] Step 5: According to the initial time-domain channel impulse response, evaluate the noise power of the time-domain...

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Abstract

The invention discloses a method for filtering time domain channel response noises. Based on time domain synchronous orthogonal frequency division multiplexing system, and on the basis of eliminating inter-symbol interferences and inter-carrier interferences between a pseudorandom sequence and a data frame body part, the method adopts a minimum mean square error algorithm and simultaneously combines the dynamic evaluation of the noise margin of a time domain channel response to accurately differentiate an effective path and an invalid path in a time domain channel impulse response, can filtermost of channel noises and accurately estimate channel characteristics under various channel environments, and greatly improves the performance of a system receiver.

Description

technical field [0001] The invention relates to a method for filtering out time-domain channel response noise. Background technique [0002] In a Time Domain Synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM) system, the signal frame transmitted at the sending end can be divided into two parts that do not overlap each other in time, that is, the pseudo-random PN sequence and the data section like figure 1 and figure 2 shown. However, due to the existence of multipath effects, the received signal at the receiving end but consists of two parts that are aliased: and in Represents the linear convolution result of the PN sequence and the channel impulse response, namely { y i , k } k = 0 M + ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 刘鲲姜光兴陈丽恒
Owner WUXI JINGXIN MICRO ELECTRONICS CO LTD