Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1997-12-17
1999-08-17
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Interference or noise reduction
H04B 710
Patent
active
059404540
ABSTRACT:
A receiver for receiving a radio signal carrying digitally-encoded data has a plurality of diversity antennas, respectively coupled to inputs of a selector. A received signal selected by the selector is equalized by an adaptive equalizer and then demodulated to recover data, when possible. A quality metric dependent on the quality of the recovered data is generated. A switch controller responsive to the quality metric controls the selector. After the controller controls the selector to select a new antenna, it monitors the quality metric as the adaptive equalizer retrains and, if the quality metric does not exceed a predetermined threshold before a predetermined forward guard time expires, the controller causes the selector to select another antenna. The switch controller may also receive a signal level signal dependent on the level of the received signal. After the controller controls the selector to select a new antenna, if the level of the received signal is less than a predetermined threshold the demodulator recovers data, if possible, for a short, predetermined time and, if the quality metric derived therefrom does not exceed a predetermined threshold, the controller controls the selector to select another antenna after the short, predetermined time.
REFERENCES:
patent: 4499606 (1985-02-01), Rambo
patent: 4566133 (1986-01-01), Rambo
patent: 4633519 (1986-12-01), Goteh et al.
patent: 5313660 (1994-05-01), Lindenmeier et al.
patent: 5355010 (1994-10-01), Lindenmeier et al.
patent: 5561673 (1996-10-01), Takai et al.
patent: 5634204 (1997-05-01), Takahashi et al.
patent: 5818543 (1998-10-01), Lee
McNicol John Duncan
Orchard Edward Anthony
Ghebretinsae Temesghen
Jiang Lenny
Nortel Networks Corporation
Yin Ronald L.
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