Apparatus and method for optimizing the quality of a received si

Details Apparatus and method for optimizing the quality of a received si Apparatus and method for optimizing the quality of a received si

1997-11-25

1998-05-26

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552262, 455 673, H04B 106, H04B 700

Patent

active

057582718

ABSTRACT:
A code division multiple access (CDMA) radio receiver (104) having gain receives a radio frequency (RF) signal (122) to produce a received signal (124). The quality (130) of the received signal (124) is determined (111). The quality (130) is preferably a ratio of an energy per chip of a desired signal (Ec) to a total power spectral density of the received signal (Io) (124). For alternative radio receivers (104) the quality (130) may be an error rate estimate of a demodulated signal (126). The gain of the radio receiver (104) is adjusted responsive to the quality (130) of the received signal (124) to optimize the quality (130) of the received signal (124). Further, since the adjusted gain also changes a received signal strength indication (RSSI) (242) of the received signal (124), the RSSI (242) of the received signal (124) is estimated (217) and compensated (218) responsive to the gain of the radio receiver (104) to produce a compensated RSSI (134) of the received signal (124) indicative of the RSSI of a desired RF signal (122).

REFERENCES:
patent: 5001776 (1991-03-01), Clark
patent: 5119508 (1992-06-01), Shamasundara
patent: 5321847 (1994-06-01), Johnson, Jr.
patent: 5390345 (1995-02-01), Wada et al.
patent: 5408698 (1995-04-01), Serizawa et al.
patent: 5448774 (1995-09-01), Yokozaki et al.
patent: 5469115 (1995-11-01), Peterzell et al.

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