Modified absolute phase detector

Details Modified absolute phase detector Modified absolute phase detector

1985-02-05

1986-04-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 375118, 375 20, 371 43, 371 46, 371 49, H04L 100, H04L 700

Patent

active

045832366

ABSTRACT:
Disclosed is a modulation-demodulation system and method for transmitting a plurality of sequentially received information bit sequences, the system including a transmitter having a state machine for expanding by a coding process each information bit sequence into an expanded bit sequence with a coded bit group portion and, in some cases, an uncoded bit group portion. The transmitter further includes a modulator for modulating a carrier signal by one of a plurality of multilevel symbols in a two-dimensional complex plane in response to each sequentially applied expanded bit sequence, with the coded bit group portion being used to specify a subset of the multilevel symbols which when rotated in the complex plane maps upon another subset for each adverse angular rotation and the uncoded bit group portion being used to specify for a selected multiple symbol subset the transmitted multilevel symbol of the carrier signal. The system further includes a receiver having a demodulator and slicer for demodulating and detecting the modulated carrier signal to obtain the expanded bit sequences; a phase rotation detector, coupled to the slicer, for uniquely identifying each adverse angular rotation by analyzing a plurality of non-rotated and rotated sequentially received coded bit group portions; and a phase corrector, coupled to the phase rotation detector, for compensating for the adverse angular rotation.

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Kobayashi, Yanagidaira and Kawai, "An Application of Soft Decision to Error Correcting Codes", IEEE Trans., vol. 1 of 3, pp. 293-298, Jun. 19-22, 1983.
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