Method for estimating clock frequency deviation based on fraction Fourier domain in ultra-broadband system

Abstract

The invention provides a method for estimating clock frequency offset with fraction fourier domain in an ultra-wideband system, relates to a fraction-domain-aided method for estimating ultra-wideband system clock frequency offset, which solves the problems of large network cost and complex algorithm structure brought by frequency offset estimation in a network layer. After an ultra-wideband pulse waveform is coded, the ultra-wideband pulse information c(t) is modulated, a chip signal is delayed by T1 relative to the frame head of each frame of an ultra-wideband signal s1(t), the delayed chip signal is s2(t); the s1(t) and the s2(t) are added to get an emitting signal s(t); a p-order fraction fourier transform signal fp(u) is obtained from a received signal r(t); the peak position U1 of a fraction impulse function is outputted; the central position t0 of the corresponding time domain chip signal is obtained, the dimension of the t0 is removed, the t0 is normalized to obtain the central position t0' of a time domain real chip signal, a time domain ultra-wideband pulse signal r'(t) is obtained, and the position To of the frame head of the r'(t) is determined; the time lap T2 between the time domain central position t0'of the chip signal and the position To of the frame head is determined; and the clock relative frequency offset estimation of a transceiver is obtained according to the frame head delay T1.

Description

technical field [0001] The invention relates to a synchronization technology in wireless communication, in particular to a method for estimating the frequency offset of an ultra-wideband system clock aided by a fractional domain. Background technique [0002] Clock frequency deviation (hereinafter referred to as clock frequency deviation) refers to the phenomenon that the real clock generated by the crystal oscillator is affected by the external environment, resulting in local clock frequency drift, mainly manifested as the deviation of the clock frequency at the transceiver end. In the wireless distributed network using ultra-wideband narrow pulses at the physical layer, clock frequency offset is an important issue in the research of time synchronization at the network layer. When the clock frequency offset is estimated at the network layer, it will inevitably bring a huge network overhead and the algorithm structure is complex. Contents of the invention [0003] In orde...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of large network overhead and complex algorithm structure caused by frequency offset estimation in the network layer, the present invention provides a method using fractional Fourier domain in ultra-wideband systems Methods for Estimating Clock Frequency Offset

Images