Repeater with ICS function and implementation method thereof

Abstract

The invention discloses a repeater with internet connection sharing (ICS) function and an implementation method thereof. The device is used for generating a feedback echo signal in a numeric field and cancelling partial echo signal interference in the received signal. The echo cancellation method comprises three parts, namely pseudo code insertion, channel initial estimation and adaptive tracking, wherein the inserted pseudo code is a constant amplitude zero auto correlation (CAZAC) code; in the channel initial estimation part, by utilizing the characteristic that the code is strongly auto correlated and weakly mutual correlated, the impact response and delay information of a channel are estimated through related operation; and an adaptive variable step-size algorithm is adopted in the adaptive tracking part, and the channel impact response obtained through initial estimation is used as an initial value of operating the algorithm, so that the convergence rate of the algorithm is improved. The invention has the advantages that: the convergence rate of an adaptive filter can be improved, and the performance of an echo canceller is improved; meanwhile, the algorithm complexity is not high, the calculated amount is small and the algorithm has implementability.

Description

technical field [0001] The invention relates to an echo cancellation technology in a repeater in the technical field of wireless communication, and mainly relates to a repeater with an ICS function and a realization method. Background technique [0002] In mobile communication, wireless network coverage will inevitably have weak signal areas or blind areas. The repeater is an effective supplementary method for wireless communication system coverage. It filters ground digital signals and amplifies the signals, which can effectively cover blind areas or weak areas. Area. [0003] The same-frequency forwarding mode of the repeater has the problem of mutual coupling between the transmitting and receiving antennas. When the receiving antenna receives the signal from the main base station, it simultaneously receives the signal transmitted by the transmitting antenna of the repeater. For example, figure 1 shown. Since the signal emitted by the transmitting antenna is reflected by...

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Problems solved by technology

But the disadvantage is that the convergence speed is slow, so we use the method of inserting pseudo code to estimate the channel and cooperate with the variable step size LMS algorithm to achieve the purpose of optimizing the convergence speed

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