Homodyne radio architecture for direct sequence spread spectrum

Details Homodyne radio architecture for direct sequence spread spectrum Homodyne radio architecture for direct sequence spread spectrum

1994-08-09

1996-02-27

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375200, 375316, H04B 1707

Patent

active

054955009

ABSTRACT:
A homodyne radio system for receiving direct sequence spread spectrum communications enables a received signal to be down-converted directly to a baseband signal. An input RF amplifier receives and amplifies a carrier signal modulated by a digital code sequence. A local oscillator provides a signal having a frequency substantially equal to the frequency of the carrier signal. A phase splitter coupled to the input RF amplifier receives the modulated carrier signal, and splits the signal into corresponding quadrature component signals. The mixer combines a first one of the quadrature component signals with the local oscillator signal to generate a first quadrature baseband output signal. A second one of the quadrature component signals is combined with the local oscillator signal shifted in phase by 90.degree. to generate a second quadrature baseband output signal. A transmitted signal can be generated by mixing quadrature baseband input signals with the same local oscillator and phase shifted local oscillator signals.

REFERENCES:
patent: 4736390 (1988-04-01), Ward et al.
patent: 5241561 (1993-08-01), Barnard
patent: 5241566 (1993-08-01), Jackson

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