A wireless communication system and a signal processing method thereof

Abstract

The invention provides a wireless communication system. The wireless communication system comprises a channel estimation circuit, a shortening circuit, a time domain decision feedback equalizer and acoefficient calculation circuit, The channel estimation circuit is used for generating an estimation channel impulse response according to a receiving signal. The shorting circuit is used for intercepting a shorted pulse response from the estimation channel pulse response according to a main energy distribution area of the estimation channel pulse response. The time domain decision feedback equalizer is used for applying a time domain equalization program to the received signal, and comprises a feedforward filter for filtering the received signal. And the coefficient calculation circuit is used for calculating a group of feedforward filtering coefficients according to the shorted pulse response for the feedforward filter to use.

Description

technical field [0001] The present invention relates to wireless communication systems, and in particular to techniques for determining filter coefficients for time-domain decision-feedback equalizers in wireless communication systems. Background technique [0002] In many wireless communication systems, in order to eliminate the interference caused by multiple propagation paths (multipath), a time-domain equalizer is provided at the receiving end. Single-carrier time-domain transmission for digital video broadcasting–cable (DVB-C), Advanced Television Systems Committee (ASTC), digital terrestrial multimedia broadcast (DTMB), etc. For wireless communication standards, decision-feedback is an effective and practical equalizer architecture. [0003] figure 1 A schematic diagram of a wireless receiver 100 is presented. The wireless receiver 100 includes a channel estimation circuit 110 , a coefficient calculation circuit 120 and a time domain determined feedback equalizer 13...

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Problems solved by technology

More specifically, the longer the estimated channel impulse response h found by the channel estimation circuit 110, the larger the matrix H will be, and the more complicated the calculations that the coefficient calculation circuit 120 needs to perform will be

It can be understood that if the coefficient calculation circuit 120 takes a long time to generate the initial value of the filter coefficient due to complex calculations, even if the obtained calculation result is ideal, the time domain determines the time when the feedback equalizer 130 can start to operate stably Points may instead be subject to delays

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