Variable-step self-adaptive echo interference cancellation method based on preliminary channel estimation

A technology of echo interference and echo cancellation, applied in the direction of baseband system components, etc., can solve problems such as slow convergence speed and large steady-state error, and achieve the effect of increasing convergence speed, reducing steady-state error, and satisfying real-time performance

Active Publication Date: 2010-12-22
SUNWAVE COMM +1
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Problems solved by technology

[0003] In order to overcome the shortcomings of slow convergence speed and large steady-state error of the existing adaptive echo interference cancellation algorithm, the present invention provides a variable step size adaptive echo interference cancellation method based on channel initial estimation, using channel estimation, channel tracking Completing the echo interference cancellation, this method can quickly capture the echo channel characteristics, track the channel change process in real time, and recover the signal submerged in the echo interference noise accurately and in real time

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  • Variable-step self-adaptive echo interference cancellation method based on preliminary channel estimation

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[0037] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0038] The overall design block diagram of this scheme is as follows: Figure 4 as shown,

[0039] In the initial channel estimation stage, the echo channel is the channel to be estimated in this scheme, the training sequence unit is used to generate the training sequence, the useful signal unit generates the useful signal, the initial channel estimation unit completes the echo channel initial estimation, and the channel tracking unit completes the channel precision Estimate and track echo channel changes.

[0040] first Figure 4 The switch on the left side is set to the side of the channel initial estimation unit, the switch of the system unit transmitter is set to the side of the training sequence unit, and the training sequence unit is generated by the transmitting device to transmit the training sequence, and the signal returns to the system unit and the...

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Abstract

The invention discloses a variable-step self-adaptive echo interference cancellation method based on preliminary channel estimation, which comprises a preliminary channel estimation process based on correlation detection, a channel tracking process based on a variable-step self-adaptive algorithm and an echo cancellation process, wherein the initial characteristic parameters of the echo channel are acquired in the preliminary channel estimation process; the precise channel tracking process is completed according to the channel characteristic parameters acquired by the channel preliminary estimation process; and the extraction of useful signals is completed in the echo cancellation process. The invention is suitable for processing the problems of channel estimation, channel identification,channel tracking and echo interference cancellation in time-invariant channels and time-variant channels. The method can quickly capture the characteristics of the echo channel, track the variation process of the channel in real time, and accurately restore the signals submerged in echo interference noise in real time.

Description

Technical field [0001] The invention mainly involves the centralized channel balance in the wireless communication system, and it is mainly a method of adaptive echo interference with the adaptive echo interference based on the beginning of the channel. Background technique [0002] At present, the echo elimination scheme is used. One method is to assume that the return channel is constant system. By detecting the characteristics of the echo channel, according to this channel characterTo restore useful signals.The disadvantage of this plan is that the channel is constant system, and the return channel is the time -changing system.Another method is to use the adaptive (LMS, Least Mean Square) echo to interfere with the characteristics of the cord algorithm to track the channel characteristics, and can track the process of slow changes in channels. HoweverIn an environment where the channels are slowly changing or the signal quality requirements are not high, it is not suitable for...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 杜守田杭洪迪
Owner SUNWAVE COMM
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