DSP implementation of a cellular base station receiver

Details DSP implementation of a cellular base station receiver DSP implementation of a cellular base station receiver

1996-06-17

1998-06-09

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375326, 329327, H04L 2714, H03D 300

Patent

active

057647046

ABSTRACT:
Demodulating FM signals using digital signal processing extracts a carrier signal from digitized channel signals, multiplies the digital channel signal with this extracted carrier signal, and further filters out the carrier signal to produce the demodulated signal. The DSP technique first down converts a group of channels to baseband which are then processed through an A/D converter to produce a digitized composite signal. A bank of bandpass filters, typically based on FFT processors, applied to the composite signal produce (a group of) digitized channel signal(s). The digitized channel signal is then demodulated by recovering a carrier signal by digitally filtering, for example, using a Hilbert bandpass filter, the channel signal and digitally filtering the product of the carrier signal and the channel signal to recover the modulating voice signals.

REFERENCES:
patent: 3634773 (1972-01-01), Kobayashi
patent: 4803739 (1989-02-01), Daikoku
patent: 5177611 (1993-01-01), Gibsonb et al.
patent: 5434577 (1995-07-01), Baghdady

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