H - Electricity – 03 – D
Patent
H - Electricity
03
D
363/17
H03D 1/02 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01)
Patent
CA 1312390
ABSTRACT OF THE DISCLOSURE Coherent phase recovery in a time division multiple access (TDMA) system can be attained in a novel manner. After symbol-timing and frequency-offset are estimated, the stored received phase at the desired sampling instant is gated from memory and fed to the input of the carrier phase recovery circuitry. During a first half portion of a burst, the first half portion of the burst is stored, while the loops acquire lock. The first half portion is then fed to one of the loops in a reverse order of its reception. Demodulation is initiated as a common state of both loops in a mid-portion of the signal burst. The previously stored first half portion is backwardly demodulated by one of the loops, while the other loop demodulates the second half portion of the burst. The whole burst is recovered by storing the demodulated first and second half portions in random access memory, and then reordering the stored demodulated burst by reading the memory backwards for the first portion.
596528
Chuang Justin Che-I
Sollenberger Nelson Ray
Bell Communications Research Inc.
Cassan Maclean
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