Pulse or digital communications – Repeaters – Testing
Patent
1985-09-27
1987-05-26
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 96, 364724, H04L 2714
Patent
active
046690956
ABSTRACT:
A maximum distance from zero-crossing demodulation method for MSK or OK-QPSK signals is disclosed which utilizes the zero-crossing information for establishing a bit edge reference and an optimum sampling point situated essentially midway between the zero-crossings of the higher of the two incoming signalling tones. This method is able to provide improved noise immunity over other known methods by at least an additional 10 degrees of phase margin while conserving processor steps during the phase detection process.
REFERENCES:
patent: 3372375 (1968-03-01), Lem
patent: 3443775 (1973-07-01), Hutchinson et al.
patent: 3674934 (1972-07-01), Gooding et al.
patent: 3719779 (1973-03-01), Wilson
patent: 3930121 (1975-12-01), Mathiesen
patent: 3993868 (1976-11-01), Balcewicz
patent: 4028490 (1977-06-01), Epstein
patent: 4072905 (1978-02-01), Keelty
patent: 4076956 (1978-02-01), Dogliotti et al.
patent: 4087752 (1978-05-01), Melvin
patent: 4128828 (1978-12-01), Samejima et al.
patent: 4156867 (1979-05-01), Bench
patent: 4229822 (1980-10-01), Bench
patent: 4246653 (1981-01-01), Malm
patent: 4246654 (1981-01-01), Malm
patent: 4267591 (1981-05-01), Wissel et al.
patent: 4270206 (1981-05-01), Hughes
patent: 4324001 (1982-04-01), Rhodes
patent: 4414675 (1983-11-01), Comroe
patent: 4457005 (1984-06-01), Burke
patent: 4460806 (1984-07-01), Canniff et al.
patent: 4468752 (1984-08-01), Chatham
patent: 4468794 (1984-08-01), Waters
Atobe et al., "One Solution for Constant Envelope Modulation", Fourth International Conference on Digital Satellite Communication, Montreal, Canada, (Oct. 23-25, 1978).
Coherent Demodulator--from IEEE Transactions on Communications, Jun. 1972, pp. 429 through 435, by DeBuda.
The Effect of Tandem Band and Amplitude Limiting on the Eb/No Performance of Minimum (Frequency) Shift Keying (MSK), by H. Robert Mathwich--from Transactions on Communications, vol. COM-22, No. 10, Oct. 1974, pp. 1525 through 1539.
Digital Phase Sampling for Microcomputer Implementation of Carrier Acquisition & Coherent Tracking--from IEEE Trans. on Comm., vol. COM28, No. 8, Aug. 1980, by Charles R. Cahn & Leimer.
Filtering in the Time and Frequency Domains--by Herman J. Blinchikoff and Anatol I Zverev, (Westinghouse Electric Corporation), a Wiley Interscience Publication--pp. 72 and 73.
An Illustration of the MAP Estimation Method for Deriving Closed-Loop Phase Tracking Topologies: The MSK Signal Structure--by Richard W. D. Booth.
MC6801 Reference Manual, Motorola Microprocessor Operations, Austin, Texas; First Edition, 1980, pp. 1-8 through 1-10.
Motorola Inc.
Roney Edward M.
Safourek Benedict V.
Southard Donald B.
LandOfFree
Maximum distance from zero crossing MSK demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Maximum distance from zero crossing MSK demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maximum distance from zero crossing MSK demodulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-708622