Technique for demodulating a linear modulated data signal in...

Details Technique for demodulating a linear modulated data signal in... Technique for demodulating a linear modulated data signal in...

2005-06-07

2005-06-07

Ghayour, Mohammad H. (Department: 2734)

Pulse or digital communications

Receivers

Angle modulation

C375S329000, C375S334000, C375S335000

Reexamination Certificate

active

06904104

ABSTRACT:
A receiver section recovers the in-phase and quadrature components of a linear modulated data signal. The in-phase signal is sampled and quantized producing an in-phase sample stream, and the quadrature phase signal is sampled and quantized producing a quadrature sample stream. The in-phase sample stream and the quadrature sample stream are both over-sampled at a rate of N times a symbol rate of the data signal. A decimation section filters the quantized in-phase sample stream and the quantized quadrature sample stream to produce a reduced in-phase sample stream and a reduced quadrature sample stream at a rate of M times the symbol rate, wherein M is less than or equal to N. A decision component calculates the magnitude of a combination of an in-phase sample and a quadrature sample at M corresponding sample points in the reduced in-phase sample stream and the reduced quadrature sample stream, respectively, and then forms an in-phase symbol stream and a quadrature symbol stream using the in-phase sample and the quadrature sample, respectively, associated with the sample point having a largest magnitude.

REFERENCES:
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EPO Standard Search Report No. RS 104452 dated May 22, 2000.

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