Pulse or digital communications – Spread spectrum
Patent
1997-08-18
2000-06-27
Chin, Stephen
Pulse or digital communications
Spread spectrum
375148, 375150, 375367, 370342, H04K 100
Patent
active
060815477
ABSTRACT:
A CDMA communication system comprises: N antennas, arranged for space diversity receiving, for receiving a CDMA direct conversion radio wave signal including data to respectively generate N reception CDMA signals; a searching circuit for searching a phase of PN code in one of the N reception CDMA signals; N phase tracking circuits having N correlation detectors for tracking phases of the PN codes in the N reception CDMA signals in accordance with the searched phase to generate phase information of the PN codes, respectively; N de-spreading circuits for de-spreading the N received CDMA direct conversion signals in accordance with the phase information, respectively; and a diversity combining circuit for combining outputs of the N de-spreading circuits to provide the space diversity receiving to output the combined signal. A switch may be further provided for successively selecting one of the N reception CDMA signals periodically and supplying one of the N reception CDMA direct conversion signals to the searching circuit. The phase information is generated in various ways. For example, the larger amounts of in-phase points than a reference are used.
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A Space-Path Hybrid Diversity Scheme for Base-Station Reception in CDMA Mobile by Y. Karasawa et al; Technical report of IEICE.; May 1993.
Chin Stephen
Fan Chieh M.
Matsushita Electric - Industrial Co., Ltd.
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