Digital methods and apparatus reverse link signal detection and

Details Digital methods and apparatus reverse link signal detection and Digital methods and apparatus reverse link signal detection and

1993-11-12

1996-04-23

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375365, H04B 126

Patent

active

055110983

ABSTRACT:
Digital methods and apparatus for reverse link signal detection and recovery in a mobile data base station. In accordance with the method, the received signal is frequency downshifted by multiplying the received signal by inphase and quadrature components of a local carrier oscillator, and the resulting downshifted inphase and quadrature components of the signal vector is sampled and digitized at a rate of more than twice the expected bit rate. Difference vectors for digitized downshifted signal vectors one expected bit time apart are determined and examined for detection of a dotting sequence and for estimation of the carrier frequency error, which on detection of the dotting sequence, is used to initially correct the digitized downshifted signal vectors for the frequency error. Techniques for bit timing recovery, frequency error correction during data detection and detection of voice versus data, as well as other features of the invention, are disclosed.

REFERENCES:
patent: 4608703 (1986-08-01), Kaga et al.
patent: 4849991 (1989-07-01), Arnold
patent: 5113415 (1992-05-01), Muto
patent: 5121414 (1992-06-01), Levine et al.
patent: 5291527 (1994-03-01), Haruyama
patent: 5343499 (1994-08-01), Jasper et al.
patent: 5363414 (1994-11-01), Muto

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