Apparatus and method for eliminating echo, transmit-receive equipment containing the apparatus

Abstract

The invention discloses an echo cancellation module comprising a training sequence generator, a change-over switch, a training sequence detector, an adjustable delay, an echo channel estimator, a filter and an adder. Firstly, the input terminal of the switch is connected with the training sequence generator, the training sequence detector estimates the delay parameter of the echo channel accordingto the training sequence sent by the training sequence generator, then the echo channel estimator starts to work and estimates the echo channel according to the input signal, the training sequence and the delay parameter, and adjusts the estimator coefficient; when the estimator coefficient is convergent, the input terminal of the change-over switch is switched to the adder, afterwards, the receiving and sending equipment stops outputting the training sequence, and outputs the user signal with the echo cancelled. The invention also comprises a receiving and sending equipment comprising the echo cancellation module of the invention and an echo cancellation method. The invention can cancel the echo signal on the receiving antenna of the receiving and sending equipment which is coupled withthe sending antenna of the receiving and sending equipment.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an echo canceling device, an echo canceling method, and a transceiver device including the echo canceling device. Background technique [0002] In a wireless communication system, the phenomenon that a signal sent by a transmitting antenna of a transceiver device is received by a receiving antenna of the same transceiver device is called echo interference. The echo interference problem generally exists in various communication devices, especially in the repeater, and the echo interference problem is particularly prominent. Therefore, the following uses the repeater as an example to illustrate. [0003] At present, repeaters are widely used in digital multimedia terrestrial broadcasting systems. The main function of the repeater is to amplify the received weak user signal and forward it. Due to the limitations of practical applications, it is difficult to achieve ...

AI Technical Summary

Problems solved by technology

[0004] There are some echo cancellation techniques in the prior art, but these echo cancellation techniques have the defects of poor stability and high complexity

In addition, some echo cancellation techniques need to continuously send training sequences, which not only takes up a lot of data resources, but also brings additional interference to user signals

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