Ultra-wideband communication method based on time-frequency conversion and slippage correlation

Abstract

The invention discloses an ultra-wideband communication method based on Dechirp and slippage correlation, comprising the following steps of: at a transmitting terminal of an ultra-wideband communication system, inserting a pilot sequence in sent data firstly; then, performing base-band modulation and linear frequency modulation and spread spectrum; outputting an ultra-wideband transmission signalat the linear frequency modulation and spread spectrum of an available radio frequency band; at a receiving terminal of the ultra-wideband communication system, firstly by using a slippage correlation method, completing synchronization of a received signal through adjusting the time delay of an ultra-wideband reference signal of the linear frequency modulation and spread spectrum; then, mixing the ultra-wideband reference signal of the linear frequency modulation and spread spectrum with the received signal, namely, performing Dechirp process; and finally, after filtering in low pass, demodulating the base band of the received signal. According to the ultra-wideband communication method, the sampling rate and the signal processing scale of the receiving terminal can be reduced; the synchronization precision requirements are not high; the complexity is very low; and the method is especially applicable for ultra-wideband expand distance low-speed communication with high spread spectrum gain.

Description

technical field [0001] The invention relates to an ultra-wideband communication method using linear frequency modulation spread spectrum, in particular to an ultra-wideband communication method adopting a Dechirp and sliding correlation structure. Background technique [0002] In February 2002, the U.S. Federal Communications Commission (FCC) approved ultra-wideband technology to enter the civilian field, and redefined ultra-wideband, stipulating that ultra-wideband signals are radios with -10dB fractional bandwidth greater than 20% or -10dB absolute bandwidth greater than 500MHz signal, and the radiation power spectral density in the main operating frequency band is limited below -41.3dBm / MHz. UWB technology is mainly used in communication systems, imaging systems, radar systems and measurement systems. Since 2002, new technologies have emerged continuously, and various system design schemes such as carrier-free ultra-wideband, single-carrier ultra-wideband, and multi-carr...

AI Technical Summary

Problems solved by technology

Although this method can be implemented with low-cost, low-power SAW devices to obtain the required spread-spectrum gain to avoid the lack of dynamic range of the received signal, but because it is still an ultra-wideband signal after the pulse compression of the matched filter, it needs Using large dynamic range receivers, high sampling rate analog-to-digital conversion devices and high signal processing scale, it still has high implementation complexity when applied to ultra-wideband extended distance and low-speed communication with high spreading gain

At the same time, this solution has high requirements for analog circuits, its parameter design is not flexible, and its accuracy and stability are poor.

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