Receiver for spread spectrum communication

Details Receiver for spread spectrum communication Receiver for spread spectrum communication

1995-09-20

1998-03-03

Ghebretinsae, Temgesghen

Pulse or digital communications

Repeaters

Testing

375208, H04K 100

Patent

active

057243816

ABSTRACT:
A differential detector (2) reproduces a spreading code (S2) of a received signal (S1). A digital correlator (4) calculates a correlation value between the reproduced spreading code (S2) and a reference spreading code (S3) by collating bit by bit. The timing when the correlation value exceeds a predetermined threshold value (D2) means that the reproduced spreading code (S2) and the reference spreading code (S3) match in phase. A phase of the reproduced spreading code (S2), or a phase of the received signal (S1), is discriminated at that timing. A multiplier (8) outputs a modulated signal (S6) by multiplying the received signal (S1) bit by bit in phase by a spreading code (S5) which has the same code as the reference spreading code (S3). In result, a spreading code with an accurate code sequence and phase is obtained for despreading, and theoretical process-gain is obtained.

REFERENCES:
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5243622 (1993-09-01), Lux et al.
patent: 5396515 (1995-03-01), Dixon et al.

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