Equalization in orthogonal frequency domain multiplexing

Details Equalization in orthogonal frequency domain multiplexing Equalization in orthogonal frequency domain multiplexing

2007-10-02

2007-10-02

Lugo, David B. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S345000, C375S346000

Reexamination Certificate

active

10352669

ABSTRACT:
A COFDM demodulator providing independent DQPSK symbol amplitude and phase equalization provides improved soft-symbol estimates by reducing the possibility of clipping in the differential demodulator, improving the tolerance of the differential demodulator to finite word length effects, correcting for phase drifting between adjacent subcarriers, and improving signal-to-noise ratio (SNR) calculation accuracy for maximal ratio combining applications. Separate acquisition and tracking modes for the amplitude and phase equalizers are provided that handle start-up, reacquisition, and steady-state operation of the demodulator.

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