Spread spectrum transmitter, spread spectrum receiver and spread

Details Spread spectrum transmitter, spread spectrum receiver and spread Spread spectrum transmitter, spread spectrum receiver and spread

1997-12-09

2000-12-12

Pham, Chi H.

Pulse or digital communications

Spread spectrum

375345, H04B 1500, H04K 100, H04L 2730

Patent

active

061608386

ABSTRACT:
A spread spectrum transmitter and receiver are provided wherein data can be accurately decoded by removing the effect of mutual interference of the quadrature component and in-phase component even when there is carrier frequency error. In a method of spread spectrum communication using a QPSK modulation system, there are provided: a demodulating circuit that receives and demodulates a signal transmitted with a prescribed time difference Td applied between the IQ components; correlators that find the mutual correlation of the IQ components and spreading code; a sampling circuit that samples their output signals; a phase calculator that calculates the phase from the ratio of the IQ components of these output signals; a differential decoding circuit that performs differential decoding on this output signal; an automatic frequency control circuit that corrects the frequency error of this output signal; a decoding circuit; and a clock recovery circuit.

REFERENCES:
patent: 4528526 (1985-07-01), McBiles
patent: 4567602 (1986-01-01), Kato et al.
patent: 5222104 (1993-06-01), Medendrop
patent: 5473290 (1995-12-01), Scomazzon et al.
patent: 5619524 (1997-04-01), Ling et al.
patent: 5687190 (1997-11-01), Tsao
patent: 5734639 (1998-03-01), Bustamante et al.
patent: 5881099 (1999-03-01), Takahashi et al.
patent: 5881107 (1999-03-01), Termerinace et al.

Affiliated with

Also associated with

Rating

Spread spectrum transmitter, spread spectrum receiver and spread does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spread spectrum transmitter, spread spectrum receiver and spread, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread spectrum transmitter, spread spectrum receiver and spread will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-224356