System and method for obtaining frequency and time synchronization in a wideband communication system

摘要

This document discusses, among other things, a system and method of measuring and correcting for frequency offset in wideband signals of bandwidth X within a communications system. A synchronization signal is generated and transmitted, wherein generating a synchronization signal includes generating a first chirp signal that sweeps a portion of bandwidth X and generating a second chirp signal to sweep approximately the same portion of bandwidth X but in the opposite direction. The synchronization signal is received at a receiver. The receiver then detects a first offset as a function of the first chirp signal and a second offset as a function of the second chirp signal and calculates the frequency offset as a function of the first and second offsets.

主权项

1. A method of measuring frequency offset in wideband signals of bandwidth X within a communications system having a coherency time constant of T, comprising:
generating a synchronization signal during a preamble of a data frame, wherein generating the synchronization signal includes:
generating a first chirp signal that sweeps a portion of bandwidth X; andgenerating a second chirp signal that sweeps approximately the same portion of bandwidth X in a direction opposite to the first chirp signal; transmitting the synchronization signal; receiving a wideband signal at a receiver; generating a receiver chirp signal in the receiver; detecting a first offset as a function of the first chirp signal and the receiver chirp signal; detecting a second offset as a function of the second chirp signal and the receiver chirp signal; and calculating the frequency offset as a function of the first and second offsets; and tracking a time offset over the data frame based on the calculated frequency offset.