Frequency offset detector for AFC under rayleigh fading

Details Frequency offset detector for AFC under rayleigh fading Frequency offset detector for AFC under rayleigh fading

2006-12-05

2006-12-05

Kim, Kevin (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C455S164100, C455S192200

Reexamination Certificate

active

07145970

ABSTRACT:
A frequency offset detector for AFC under Rayleigh fading. The AFC includes a variable phase generator, an exponential term ej Δ107 tmultiplied on an incoming signal, a low-pass filter, a gain amplifier, a multiplier, and an offset detector. The offset detector includes a filter, an amplifier, a delay block, three adders, and two blocks that output the absolute value of an inputted signal. The filter is a Finite Impulse Response (FIR) filter that produces a Hilbert Transformation of the inputted complex gain. The Hilbert FIR filter, together with the complex gain and two of the adders, generate two complex signals: Xp and Xn respectively representing the positive and negative frequency components of the inputted complex gain. The detector output is equal to the difference between the magnitudes of Xp and Xn.

REFERENCES:
patent: 5802117 (1998-09-01), Ghosh
patent: 6097770 (2000-08-01), Bahai et al.

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