Demodulation apparatus and method in a communication system...

Details Demodulation apparatus and method in a communication system... Demodulation apparatus and method in a communication system...

2006-07-04

2006-07-04

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Receivers

Angle modulation

C375S340000, C375S341000, C329S304000

Reexamination Certificate

active

07072426

ABSTRACT:
An 8-ary PSK demodulation apparatus for receiving an input signal Rk(Xk, Yk) comprised of a kthquadrature-phase component Ykand a kthin-phase component Xk, and for generating soft decision values Λ(sk,0), Λ(sk,1), and Λ(sk,2) for the input signal Rk(Xk, Yk) by a soft decision means. A calculator calculates Zkby subtracting a level |Yk| of the quadrature-phase signal component Ykfrom a level |Xk| of the in-phase signal component Xk, and outputs the Zkas a first soft decision value. A first selector selects the Zkor reverse −Zk, according to an MSB of the quadrature-phase signal component Yk. A second selector selects the Zkor the reverse −Zkaccording to an MSB of the in-phase signal component Xk. A third selector selects an output of the second selector or a value “0” according to an MSB of the Zk. A first adder adds √{square root over (2)}Ykto an output of the third selector, and outputs the result value as a third soft decision value. A fourth selector selects an output of the second selector or a value “0” according to the MSB of the Zk. A second adder adds √{square root over (2)}Xkto an output of the fourth selector, and outputs the result value as a second soft decision value.

REFERENCES:
patent: 5278871 (1994-01-01), Rasky et al.
patent: 5867538 (1999-02-01), Liu
patent: 6529559 (2003-03-01), Reshef
patent: 6594318 (2003-07-01), Sindhushayana
patent: 2001/0021233 (2001-09-01), Jin
patent: 2002/0131515 (2002-09-01), Rodriguez
Kenneth M. Mackenthun, “Covariance Matrix Properties and Multiple Symbol/Soft Decision Detetion in Slow Flat Rician Fading”, Feb. 1, 1995.

Affiliated with

Also associated with

Rating

Demodulation apparatus and method in a communication system... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Demodulation apparatus and method in a communication system..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demodulation apparatus and method in a communication system... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3552951