Method to indicate synchronization lock of a remote station with

Details Method to indicate synchronization lock of a remote station with Method to indicate synchronization lock of a remote station with

1998-06-11

2000-07-04

Chin, Stephen

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375362, H04L 700, H04L 704

Patent

active

060849320

ABSTRACT:
A method for a wireless discrete multitone spread spectrum communications system, synchronizes the remote station to the base station. The method begins with the step of generating a clock signal at the base station. The base station then derives a synchronization symbol pattern from the base station clock signal and spreads the it with spreading codes that distributes the symbol pattern over a plurality of discrete tones, forming a discrete multitone spread spectrum signal. The base station then transmits the spread signal to the remote station. The remote station generates a first clock signal and samples the discrete tones using the remote station first clock signal, forming a first sampled signal. Then the remote station applies the first sampled signal to a matched filter bank, forming a frequency error signal. The method then adjusts a frequency of the remote station first clock signal using the frequency error signal, forming a second clock signal. Then the remote station samples the discrete tones using the remote station second clock signal, forming a second sampled signal. Then the remote station despreads the second sampled signal with despreading codes to extract the synchronization symbol pattern. Then the remote station compares the extracted synchronization symbol pattern with a reference symbol pattern at the remote station. If the comparing step is successful, then the remote station selectively processes traffic signals received from the base station using the second clock signal. If the comparing step is not successful, then the remote station selectively adjusts a time offset value of the remote station second clock signal forming a third clock signal. The remote station then samples the discrete tones using the remote station third clock signal, forming a third sampled signal. The remote station then despreads the third sampled signal with despreading codes to form a second extraction of the synchronization symbol pattern. The remote station then compares the second extraction of the synchronization symbol pattern with the reference symbol pattern at the remote station. If the step of comparing the second extraction is successful, then the remote station selectively processes traffic signals received from the base station using the third clock signal.

REFERENCES:
patent: 3745464 (1973-07-01), Lee
patent: 4519084 (1985-05-01), Langseth
patent: 4599732 (1986-07-01), LaFever
patent: 5054034 (1991-10-01), Tarallo et al.
patent: 5195091 (1993-03-01), Farwell et al.
patent: 5282228 (1994-01-01), Scott et al.
patent: 5428647 (1995-06-01), Rasky et al.
patent: 5490174 (1996-02-01), Shin et al.
patent: 5537228 (1996-07-01), Scott et al.
patent: 5627855 (1997-05-01), Davidovici
patent: 5659573 (1997-08-01), Bruckert et al.

Affiliated with

Also associated with

Rating

Method to indicate synchronization lock of a remote station with does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method to indicate synchronization lock of a remote station with, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to indicate synchronization lock of a remote station with will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1493215