Patent ID: 6084932
Filing Date: 2000-07-04
Classification: H04B,H04L,H04W

Abstract:
A frequency division duplex method of synchronizing a remote station to a base station in a bandwidth efficient communication system, comprising the steps of:generating a clock signal at the base station;deriving a synchronization symbol pattern from said base station clock signal;spreading said synchronization symbol pattern at the base station with spreading codes that distributes the synchronization symbol pattern over a plurality of discrete pilot tones, forming a spread signal;transmitting the spread signal from the base station;receiving the spread signal at the remote station;generating a first clock signal at the remote station;sampling said discrete pilot tones at the remote station using said remote station first clocks signal, forming a first sampled signal;applying said first sampled signal to a matched filter bank, forming a frequency error signal;adjusting a frequency of said remote station first clock signal using said frequency error signal, forming a second clock signal;sampling said discrete pilot tones at the remote station using said remote station second clock signal, forming a second sampled signal;despreading said second sampled signal at the remote station with despreading codes to extract sad synchronization symbol pattern;comparing said extracted synchronization symbol pattern with a reference symbol pattern at the remote station; andselectively processing frequency division duplex traffic signals received from the base station using said second clock signal, if said comparing step is successful.