Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1993-10-05
1996-04-02
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375355, 455137, H04B 710, H04L 102
Patent
active
055047866
ABSTRACT:
Open loop phase estimation methods and apparatus for coherent combining of signals on mobile channels using spatially diverse antennas are disclosed. In accordance with the method, the signals from each of two antennas are demodulated using inphase and quadrature components of a local carrier oscillator to provide RF demodulated inphase and quadrature components of the output of each antenna. These components are simultaneously sampled at a sample rate and digitized to provide the digitized components of the two signal vectors. A phase estimator vector having a phase equal to the difference in phase between the two signal vectors of each successive sample time is determined. An average phase estimator vector for a group of successive signal vectors is determined, and is used as the estimated phase difference between the signal vectors at the middle of the group of successive signal vectors to align the respective signal vectors prior to the same being combined into a single signal vector. Details of the method are disclosed, including variations such as the extension of the method to more than two antennas.
REFERENCES:
patent: 3783385 (1974-01-01), Dunn et al.
patent: 5012493 (1991-04-01), Hirai et al.
patent: 5031193 (1991-07-01), Atkinson et al.
patent: 5203023 (1993-04-01), Saito et al.
patent: 5280637 (1994-01-01), Larosa et al.
Bocure Tesfaldet
Chin Stephen
Pacific Communication Sciences, Inc.
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