Echo cancellation device of mobile multimedia system repeater and echo cancellation method

Abstract

The present invention discloses an echo eliminator of direct broadcasting station of mobile multimedia broadcasting system and an echo eliminating method thereof. The invention is applied for the mobile multimedia broadcasting system which has a baseband sampling rate that is larger than the physical band width and has the physical band width that is larger than the signal band width. The echo eliminating method comprises the following steps: generating a training sequence which has a baseband sampling rate that is larger than the physical band width and has the physical band width that is larger than the signal band width; eliminating echo signal channel according to the generated training sequence and receiving signal, reconstructing the echo signal according to the echo signal channel elimination result and the erasion auxiliary signal for eliminating the received echo signal; after erasing the eliminated echo signal from the received signal, adding the generated training sequence for obtaining the output signal; and simultaneously using the output signal as the erasion auxiliary signal. The invention can eliminate the echo signal of direct broadcasting station in the mobile multimedia broadcasting system and improves the performance of direct broadcasting station.

Description

technical field [0001] The invention relates to a mobile multimedia broadcasting system, in particular to an echo canceller (Echo Canceller) and an echo canceling method of a repeater of the mobile multimedia broadcasting system. Background technique [0002] In mobile communication networks and broadcasting networks, there are often some areas that cannot be completely covered, and these areas are generally called "blind spots". In order to provide users with the most complete service and achieve seamless coverage, network operators will actively eliminate these coverage blind spots. [0003] Various measures can be taken to eliminate network blind spots, such as increasing the transmitting power of the transmitter, or reducing the network radius and increasing the transmitting points, and so on. However, one of the most commonly used methods for eliminating coverage blind spots is to set OCR (On-Channel Repeater, repeater) at the places where the coverage blind spots are ...

AI Technical Summary

Problems solved by technology

Since the CMMB system has its own characteristics - the baseband sampling rate is higher than the physical bandwidth and signal bandwidth, if the traditional echo cancellation scheme is used directly, it will cause interference to the adjacent sidebands, so the traditional echo cancellation scheme cannot be directly applied The repeater of the system

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