Signal processing circuit for spread spectrum communications

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

1996-12-31

1999-03-09

Bocure, Tesfaldet

Pulse or digital communications

Repeaters

Testing

375279, 375308, 375329, H04K 100, H04L 2720, H04L 2722

Patent

active

058810994

ABSTRACT:
In a transmitting unit, an input signal is converted into an I data sequence of an in-phase (I) symbol and a Q data sequence of a quadrature (Q) symbol, a differential encoding is performed for the I and Q data sequences according to a differential binary phase shift keying (DBPSK) modulation to produce an I code sequence and a Q code sequence, a spectrum of the I code sequence is spread by a first spreading code signal to produce an I spread spectrum signal, a spectrum of the Q code sequence is spread by a second spreading code signal to produce a Q spread spectrum signal, the I and Q spread spectrum signals are quadrature-modulated to a synthesized signal, and the synthesized signal is transmitted to a receiving unit. In the receiving unit, the synthesized signal is quadrature-demodulated to a first baseband signal and a second baseband signal, the first and second baseband signals are respectively correlated with each of the first and second spreading code signals to obtain first and second I correlated signals and first and second Q correlated signals, and a BPSK delay detection is performed for a group of the first and second I correlated signals and a group of the first and second Q correlated signals to reproduce the I and Q data sequences.

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
patent: 5341396 (1994-08-01), Higgins et al.
patent: 5465269 (1995-11-01), Schaffner et al.

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