Signal processing circuit for spread spectrum communications

Details Signal processing circuit for spread spectrum communications Signal processing circuit for spread spectrum communications

1994-02-17

1996-01-30

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

H04B 1707

Patent

active

054886295

ABSTRACT:
A signal processing circuit provided with a frequency conversion circuit for converting a spread quadrature modulation signal of a carrier band into a baseband signal, a first correlator, a second correlator, a third correlator, a fourth correlator spreading code, a decoding circuit for decoding data from outputs of the first to fourth correlators, a first multiplier for calculating the square of the output of the first correlator, a second multiplier for calculating the square of the output of the second correlator, a first adder for adding up outputs of the first and second multipliers, a judgment circuit for performing a synchronization acquisition judgement, a second adder for adding up the outputs of the first and second correlators, or those of the first and fourth correlators, a subtracter for performing a subtraction between the outputs of the second and third correlators and a correction circuit for obtaining a frequency offset according to an output of the second adder and/or that of the subtracter and performing a correction when decoding the data.

REFERENCES:
patent: 4291409 (1981-09-01), Weinberg et al.
patent: 4841544 (1989-06-01), Nuytkens
patent: 4933952 (1990-06-01), Albrieux et al.
patent: 4943976 (1990-07-01), Ishigaki

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