Single-channel and multi-channel coherent demodulation devices w

Details Single-channel and multi-channel coherent demodulation devices w Single-channel and multi-channel coherent demodulation devices w

1998-08-06

2000-02-22

Bocure, Tesfaldet

Pulse or digital communications

Repeaters

Testing

370208, H04K 100

Patent

active

060288884

ABSTRACT:
Coherent demodulation is effected in single-channel and multi-channel coherent demodulation devices without any knowledge of the transmitted signal (i.e. without any pilot signal). The phase shift is estimated by applying a predetermined function to produce a signed value from the argument of a summed signal, the summed signal being itself obtained from the received signal (by quadrature demodulation, complex despreading and summing over N samples). The phase shift estimate is used in a phase-locked loop so that the system converges towards a null error. The residual static phase ambiguity introduced by application of the predetermined function is resolved. A plurality of such single-channel and multi-channel coherent demodulation devices is used in a receiving system using a plurality of diversity paths.

REFERENCES:
patent: 4841544 (1989-06-01), Nuytkens
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5233626 (1993-08-01), Ames
patent: 5459473 (1995-10-01), Dempster et al.
patent: 5799010 (1998-08-01), Lomp et al.

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