Spread spectrum communication apparatus, surface acoustic wave d

Details Spread spectrum communication apparatus, surface acoustic wave d Spread spectrum communication apparatus, surface acoustic wave d

1997-08-07

2000-06-20

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

310313R, H04B 1500, H04K 100, H04L 2730

Patent

active

060786086

ABSTRACT:
A spread spectrum communication apparatus employs a surface acoustic wave matched filter and surface acoustic wave delay lines which enables the demodulation in accordance with the QPSK scheme. A SS demodulator has a correlated signal acquisition circuit for demodulating a received SS signal to acquire a correlated signal, first and second delay circuits for delaying an output signal from the correlated signal acquisition circuit, and first and second adder circuits for adding the output signal of the correlated signal acquisition circuit and respective outputs of the first and second delay circuits. The first delay circuit delays the input signal by T+(.+-.n+5.times.a/8)/fc, while the second delay circuit delays the input signal by T+(.+-.m-5.times.a/8)/fc. Thereby, a spread spectrum communication apparatus which enables the demodulation in accordance with the QPSK scheme by a simple configuration using a surface acoustic wave matched filter and surface acoustic wave delay lines is provided.

REFERENCES:
patent: 4100498 (1978-07-01), Alsup et al.
patent: 4164628 (1979-08-01), Ward et al.
patent: 5189330 (1993-02-01), Niitsuma
patent: 5784403 (1998-07-01), Scott
patent: 5909461 (1999-06-01), Koga et al.

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