Direct spread spectrum signal receiving apparatus and synchronis

Details Direct spread spectrum signal receiving apparatus and synchronis Direct spread spectrum signal receiving apparatus and synchronis

1997-07-10

2000-05-23

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

325130, 325137, 325150, H04B 1500

Patent

active

060673141

ABSTRACT:
Filter coefficients of matched filters are set equivalent to those of a circuit for multiplying spread spectrum code signals of different frequencies, and a correlation value between each of the spread spectrum code signals and spread spectrum signal data. Such correlation values are averaged by their corresponding square circuits and adders. In a maximum-value selection circuit, the averaged correlation values are monitored for a plurality of samples, thus obtaining both an amount of correction of frequency deviation of carrier wave from the frequency of a pass having the largest one of the correlation values (the most matching frequency) and an amount of phase correction of the spread spectrum signal from positional information (phase information) of a sample of the pass having the largest correlation value.

REFERENCES:
patent: 5610939 (1997-03-01), Takahashi et al.
patent: 5625641 (1997-04-01), Takakusaki
patent: 5748668 (1998-05-01), Tomita et al.
patent: 5856997 (1999-05-01), Mochizuki et al.

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