| 摘要 |
PCT No. PCT/GB95/01201 Sec. 371 Date Jan. 29, 1996 Sec. 102(e) Date Jan. 29, 1996 PCT Filed May 25, 1995 PCT Pub. No. WO95/33311 PCT Pub. Date Dec. 7, 1995Coherent demodulation of phase shift keyed direct sequence spread spectrum generally needs a strong pilot to provide channel estimates and to avoid phase ambiguities. This invention relates to a novel approach in which the pilot takes the form a few known chips in every bit and in which the channel is estimated primarily by decision directed removal of the modulation and the pilot chips serve to resolve the 180 degree phase ambiguity.
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