BPSK synchronizer using computational analysis

Pulse or digital communications – Spread spectrum – Direct sequence

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

375118, 307518, 328118, H04L 702

Patent

active

046530754

ABSTRACT:
A bit synchronizer for a BPSK input signal having a sinusoidal carrier frequency f that is much greater than the modulating signal bit rate. The synchronizer comprises means (29, 31) for repetitively sampling the amplitude of the input signal over a preselected sampling interval portion of each modulating signal bit period (T). For each sampling interval, three numbers are recorded: N1, the total number of samples; N2, the number of samples that do not change sign with respect to a reference sample; and N3, the number of samples that do change sign with respect to the reference sample. When the number of samples not changing sign exceeds a preselected threshold value, which takes into account noise corruption of the input signal, bit synchronization is declared, a synchronized output clock (39) is generated, and digital data having a 180.degree. ambiguity is sent to subsequent ambiguity resolution means. When synchronization has not yet occurred, and the last sample changed sign, a phase circuit 34 is adjusted to shift in the proper direction a local clock (38), causing time-shifting of the sampling interval window prior to examination of the next modulating signal bit period (T).

REFERENCES:
patent: 3551816 (1970-12-01), Paine
patent: 4146743 (1979-03-01), Raynham
patent: 4246653 (1981-01-01), Malm
patent: 4246654 (1981-01-01), Malm
patent: 4247943 (1981-01-01), Malm
patent: 4290140 (1981-09-01), Malm
patent: 4385395 (1983-05-01), Tanaka et al.
patent: 4457005 (1984-06-01), Burke et al.
Houston, S. W., et al., "Microprocessor Bit Synchronizer for Shuttle Payload Communications", IEEE Transactions on Communications, vol. COM-26, No. 11, Nov. 1978, pp. 1594-1603.

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

BPSK synchronizer using computational analysis does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with BPSK synchronizer using computational analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and BPSK synchronizer using computational analysis will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1358911

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