Rotationally invariant trellis coding incorporating transparent

Details Rotationally invariant trellis coding incorporating transparent Rotationally invariant trellis coding incorporating transparent

1994-12-09

1997-04-15

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375262, 375341, 371 43, 341 51, 341106, H04L 512, H04L 2302

Patent

active

056217617

ABSTRACT:
A rotationally invariant trellis coder is provided for encoding data to be transmitted using a two-dimensional symbol modulation. A precoder, provided at the transmitter, processes data such that a counterpart postcoder at the receiver will provide an output that is invariant to any multiple of a 90.degree. rotation. An encoder encodes the precoded data using a transparent binary convolutional code, which can be a punctured or unpunctured code. The encoded data is mapped to a two-dimensional signal space having a plurality of signal points. The signal points are labeled with unique binary codes in which the two least significant bits, denoted by (I.sub.j, Q.sub.j), are permuted and partially complemented to (Q.sub.j, I.sub.j) for each 90.degree. phase rotation around the signal space. The remaining most significant bits for each point, if any, are invariant to such rotation. The postcoder provided at the receiver inverts the precoder and is feedback-free, thus limiting error propagation.

REFERENCES:
patent: 5233629 (1993-08-01), Paik et al.
patent: 5321725 (1994-06-01), Paik et al.
patent: 5396518 (1995-03-01), How
patent: 5535228 (1996-07-01), Dong et al.

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