System and method for eliminating intersymbol interference of ultrawideband signal of multi-path noise-free channel

Abstract

The invention relates to a system and a method for eliminating intersymbol interference of an ultrawideband signal of a multi-path noise-free channel. By setting an appropriate threshold value, a receiver searches an ultra-wideband signal pulse, and the detection is succesful until a signal level exceeds the threshold value; then, a signal window is used for extracting a received signal, and a detected composite signal pulse (formed by mixing a signal pulse and more than one multipath interference signal) is placed in the middle of the signal window; the received signal is processed through anintersymbol interference (ISI) eliminator before demodulation, so that the intersymbol interference is eliminated. According to the method, channel information or channel estimation does not need tobe acquired in advance, and analog-digital conversion is not needed; the expected signal pulse and the interference pulse can be distinguished and accurately positioned through the method; and a traditional receiving pulse is not used during signal demodulation, and a signal peak generated after wavelet transformation and high-pass filtering is used.

Description

technical field [0001] The invention belongs to the field of ultra-wideband wireless communication, and is mainly applied to the elimination of inter-symbol interference of ultra-wideband pulsed radio signals in multipath noise-free channels, and specifically relates to a system and method for eliminating intersymbol interference of multipath noise-free channel ultra-wideband signal symbols . Background technique [0002] Ultrawideband (UWB for short) technology is a very promising low-cost short-distance ultra-high-speed wireless communication technology. Impulse radio is one of its main implementations. Impulse radio uses pulses of short duration to produce a signal with an ultra-wide (several GHz) bandwidth. Therefore, UWB wireless channels are highly frequency selective. There are a large number of resolvable multipath components in the received signal. Delays of more than 30 seconds are fairly common. UWB technology is applied to Wireless Personal Area Networks (WP...

AI Technical Summary

Problems solved by technology

However, UWB pulsed radio signal bandwidth is ultra-wide, and analog-to-digital conversion requires ultra-high sampling rate, which is difficult and expensive to implement; secondly, due to the ultra-low duty cycle and extremely short pulse width of UWB pulses, it needs Quite a large number of equalizer nodes and a very high equalization rate

All of these have caused serious obstacles to the elimination of ISI in ultra-wideband pulsed radio

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