Method and apparatus for carrier tracking and demodulation

Details Method and apparatus for carrier tracking and demodulation Method and apparatus for carrier tracking and demodulation

1994-10-03

1996-07-02

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375272, 375326, 375355, 329300, 329302, H04L 2710, H04L 2722, H04L 2714, H04L 700

Patent

active

055330622

ABSTRACT:
A frequency shift keyed receiver (214, 220, 218) estimates a carrier frequency and demodulates (1020) a symbol value associated with the carrier frequency. During symbol intervals, the receiver (214, 220, 218) receives a radio signal including symbol values (502-518) corresponding to predetermined frequency offsets (604, 606) from a carrier frequency. The radio signal is digitized (1008) during a symbol interval, and then converted (1010) into a frequency domain signal. The frequency domain signal is stored (1012), and additional symbol intervals are converted to obtain a plurality of frequency domain signals, which are processed to generate (1016) a composite frequency domain signal (702, 704). A windowing function (706) of predetermined shape is convolved (1018) with the composite frequency domain signal (702, 704) to locate a frequency distribution therein that corresponds to the predetermined frequency offsets (604, 606). The carrier frequency (708) is estimated from the location of the frequency distribution, and utilized to demodulate (1020) the symbol values.

REFERENCES:
patent: 4468792 (1984-08-01), Baker
patent: 4669094 (1987-05-01), Van Rumpt
patent: 5091921 (1992-02-01), Minami
patent: 5293408 (1994-03-01), Takehashi
patent: 5414736 (1995-05-01), Hasegawa

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