Quantizing and decoding of phase-amplitude modulated signals in

Details Quantizing and decoding of phase-amplitude modulated signals in Quantizing and decoding of phase-amplitude modulated signals in

1994-11-22

1998-04-21

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Correcting or reducing quantizing errors

375340, H04B 1404

Patent

active

057426430

ABSTRACT:
In digital communications over a limited-bandwidth channel such as a radio-broadcast channel, multiple phase-amplitude shift keyed (MPASK) modulation is preferred using close packed hexagonal code. In quantizing such signals, a representation of an equalized received signal is transformed such that, to each symbol of the constellation, there corresponds a respective point on a square grid. A symbol of the constellation is determined as a quantized representative of the received signal by its selection as the one or the other of two symbols of the constellation having transformed representations at vertices of the square or rectangle in which the transformed signal lies. Such quantizing can be performed at a rate which is independent of the size of the constellation, and can be combined with similarly advantageous decoding in a receiver.

REFERENCES:
patent: 4562425 (1985-12-01), Turner et al.
patent: 4727534 (1988-02-01), Debus, Jr. et al.
patent: 5214672 (1993-05-01), Eyuboglu et al.
patent: 5311547 (1994-05-01), Wei
M.K. Simon et al., "Hexagonal Multiple Phase-and-Amplitude-Shift-Keyed Signal Sets", IEEE Transactions on Communications, vol. COM-21 (1973), pp. 1108-1115.
W.H. Mow, "Faxt Decoding of the Hexagonal Lattice with Applications to Power Efficient Multi-level Modulation Systems".

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