Method and apparatus for antenna diversity in a wireless communi

Details Method and apparatus for antenna diversity in a wireless communi Method and apparatus for antenna diversity in a wireless communi

1992-09-09

1994-07-12

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375 27, 4552771, H04B 710, H04L 102

Patent

active

053295552

ABSTRACT:
The present invention comprises a method and apparatus for selecting one of at least two antennas (202, 204) in a communication unit (102) for use in a wireless communication system (100). A signal is received by a radio frequency receiver (208) during a receiving period from one of the at least two antennas (202, 204) currently selected by an antenna switch (206), the signal transmitted in a digital communications format comprising a plurality of valid data patterns and having an invalid data pattern that is not transmitted. The number of data patterns in the signal received that comprise the invalid data pattern is determined by an antenna diversity control circuit (222), and for a subsequent receiving period one of the at least two antennas (202, 204) is selected based upon the number of occurrences of the invalid data pattern determined.

REFERENCES:
patent: 4742568 (1988-05-01), Furuya
patent: 4752941 (1988-06-01), Takahara et al.
patent: 4756023 (1988-07-01), Kojima
patent: 4876743 (1989-10-01), Lindenmeier et al.
patent: 5239541 (1993-08-01), Murai

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