CDMA communication system
First Claim
1. A CDMA communication system comprising:
- 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, said N being a natural number;
searching means for searching a phase of PN code in one of said N reception CDMA signals;
N phase tracking means having N correlation detectors for tracking phases of the PN codes in said N reception CDMA signals in accordance with the searched phase to generate phase information of said PN codes, respectively;
N de-spreading means for de-spreading said N reception CDMA signals in accordance with said phase information, respectively; and
diversity combining means for combining outputs of said N de-spreading means to provide said space diversity receiving to output the combined signal.
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Accused Products
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.
33 Citations
16 Claims
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1. A CDMA communication system comprising:
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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, said N being a natural number; searching means for searching a phase of PN code in one of said N reception CDMA signals; N phase tracking means having N correlation detectors for tracking phases of the PN codes in said N reception CDMA signals in accordance with the searched phase to generate phase information of said PN codes, respectively; N de-spreading means for de-spreading said N reception CDMA signals in accordance with said phase information, respectively; and diversity combining means for combining outputs of said N de-spreading means to provide said space diversity receiving to output the combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A CDMA communication system comprising:
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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, said N being a natural number greater than one; searching means for searching a phase of PN code in one of said N reception CDMA signals; N phase tracking means; said searching means providing a signal representing the searched phase of the PN code in said one of said N reception CDMA signals to each of said N phase tracking means; said N phase tracking means having N correlation detectors for tracking respective phases of the PN codes in said N reception CDMA signals in accordance with the searched phase of the PN code in said one of said N reception CDMA signals, as provided by said signal from said searching means, to generate phase information of said respective PN codes; N de-spreading means for de-spreading said N reception CDMA signals in accordance with said phase information, respectively; and diversity combining means for combining outputs of said N de-spreading means to provide said space diversity receiving to output the combined signal.
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Specification