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Roadway echo canceling method based on channel estimation

An echo cancellation and channel estimation technology, applied in channel estimation, baseband system, baseband system components, etc., can solve the problem of large channel parameter error, reduce estimation error, improve overall performance, and avoid signal interference. Effect

Active Publication Date: 2016-03-23
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the error in estimating channel parameters based on the error signal and the forwarded signal with a certain delay is relatively large, especially in the special channel environment of the roadway

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  • Roadway echo canceling method based on channel estimation
  • Roadway echo canceling method based on channel estimation
  • Roadway echo canceling method based on channel estimation

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Embodiment Construction

[0025] A roadway echo cancellation method based on channel estimation, comprising the following steps:

[0026] 1) Process the signal to be transmitted to obtain a digital transmission signal s(n), and divide the digital transmission signal s(n) into two branch signals;

[0027] 2) Digital-to-analog conversion is performed on a branch of the digital transmission signal s(n) to generate a radio frequency transmission signal s(t). The radio frequency transmission signal s(t) is divided into two paths through a splitter, and one path is sent to the roadway wireless channel through the transmission module. The echo channel is transmitted, and the echo signal r is obtained through the receiving module 1 (t), and the other channel performs inversion, fading, and delay according to the echo channel estimation method to obtain the first-stage echo estimation signal s 1 (t);

[0028] 3) Echo signal r 1 (t) and the first-stage echo estimation signal s 1 (t) is combined into one sign...

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Abstract

The invention discloses a roadway echo canceling method based on channel estimation, belonging to the field of roadway wireless communications. The method comprises the steps of estimating a roadway echo channel in a simulated domain according to a multi-mode channel model, and performing primary echo cancellation on roadway echo signals by using a method of attenuation, time delay or the like; reconstructing echo signals y by using estimated channel information such as channel gain h and the like, wherein y=hx, and x is transmitted signals; performing secondary cancellation on echo interference signals by using the reconstructed echo signals y, and finally reducing the estimation error by adaptive adjustment. The roadway echo canceling method based on channel estimation has the advantages: the roadway channel is effectively estimated with regard to the special environment of a roadway by using the multi-mode theory; and through primary echo cancellation and echo interference reconstruction cancellation, echo interference can be effectively cancelled, the communication efficiency of the roadway can be improved, and the problem of communication echo interference in the special environment of the roadway is solved.

Description

technical field [0001] The invention relates to the field of roadway wireless communication, in particular to a method for eliminating echo signals in roadway wireless communication. Background technique [0002] The invention provides a roadway echo cancellation method based on channel estimation, which mainly solves the communication echo interference problem in the special environment of the roadway. In the same-frequency repeater, when the donor antenna receives the signal from the air, it will inevitably receive some same-frequency interference signals at the same time. These interference signals mainly come from the coverage signals of the retransmission antennas. In the case of insufficient antenna isolation, these coverage signals are fed back to the donor antenna to cause interference and even self-excitation. After the occurrence of self-excitation, the quality of the signal waveform deteriorates, which seriously affects the quality of the call and causes call dro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02H04B17/345
CPCH04L25/0202H04L25/03343
Inventor 孙彦景苗晶晶翟文艳郑红党岳攀攀江海峰王可
Owner CHINA UNIV OF MINING & TECH