Apparatus for use in equipment providing a digital radio link be

Details Apparatus for use in equipment providing a digital radio link be Apparatus for use in equipment providing a digital radio link be

1994-08-17

1998-02-10

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 53, H04L 2706

Patent

active

057177236

ABSTRACT:
Modulation schemes requiting fully coherent demodulation usually include some form of known transmission or pilot transmission to resolve the phase ambiguity which would be inevitable in any form of demodulation which relies on the data transmission allowed for demodulation. When the transmission of phase shift keying information is used without any pilot component and use of decision directed carrier recovery for demodulation is supplied, then error control coding may be used to resolve the inherent phase ambiguities. The source data is augmented with a suitable checksum, i.e. one that does not show correct data for all bits inverted prior to protection with a forward error correction code and modulation. The demodulated data is error corrected and the checksum tried. If this checks out then the data is accepted as correct. Otherwise the demodulated data is inverted and the process repeated. If this fails, blocks of demodulated data may be inverted around points corresponding to troughs in the energy of the decision derived reference. The technique allows coherent demodulation of phase shift keying without any pilot transmission resulting in very good signal to noise ratio performance.

REFERENCES:
patent: 4710960 (1987-12-01), Sato
patent: 4763331 (1988-08-01), Matsumoto
patent: 5010554 (1991-04-01), Bechtel et al.
patent: 5027374 (1991-06-01), Rossman
patent: 5073940 (1991-12-01), Zinser et al.
patent: 5111483 (1992-05-01), Serfaty
patent: 5150369 (1992-09-01), Costa

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