Method and system for maximum likelihood clock and carrier...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C375S147000, C375S326000, C375S354000, C375S355000

Reexamination Certificate

active

10627088

ABSTRACT:
The present invention provides a method and system for clock and carrier recovery in a direct sequence spread spectrum communication system. The process involves the receiver receiving a digital signal that has been transmitted by a remote transmitter. The method for joint clock and carrier recovery comprises the following steps. The received signal is down-converted and the signal is then converted to digital form. The signal is de-spread to obtain the phase of the signal constellation. The clock error at the receiver is then estimated from the phase error of the signal constellation by means of an optimal linear estimator. The discrete carrier frequency offset of the received signal is then estimated from the estimated clock error. The optimal linear estimator used here for estimating the clock error is also the maximum likelihood estimator.

REFERENCES:
patent: 5187719 (1993-02-01), Birgenheier et al.
patent: 5228062 (1993-07-01), Bingham
patent: 5361276 (1994-11-01), Subramanian
patent: 6005889 (1999-12-01), Chung et al.
patent: 6621857 (2003-09-01), Belotserkovsky et al.
Kaushik Barman and Vellenki Umapathi Reddy, ‘Maximun Likelihood Clock and Carrier Recovery in a Direct Sequence Spread Spectrum Communication System’, pp. 322-325; 2002 IEEE International Conference on Personal Wireless Communications, held in New Delhi, India, on Dec. 15-17, 2002.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and system for maximum likelihood clock and carrier... 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 and system for maximum likelihood clock and carrier..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for maximum likelihood clock and carrier... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3730604

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.