초록 ▼

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

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°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 (Ij, Qj), are permuted and partially complemented to (Qj, Ij) for each 90°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.

대표청구항 ▼

A rotationally invariant trellis coder for encoding input data to be transmitted to a receiver via a two-dimensional symbol modulation, comprising: a precoder for processing said input data, said precoder comprising nonlinear logic that is the inverse of logic provided by a counterpart postcoder at

A rotationally invariant trellis coder for encoding input data to be transmitted to a receiver via a two-dimensional symbol modulation, comprising: a precoder for processing said input data, said precoder comprising nonlinear logic that is the inverse of logic provided by a counterpart postcoder at said receiver; an encoder for encoding the precoded data using a transparent binary convolutional code; and means for mapping the encoded data from said encoder to a two-dimensional signal space having a plurality of signal points, said points being labeled with unique binary codes in which the two least significant bits, denoted by (Ij, Qj), are permuted and partially complemented to (Qj, Ij) for each 90°phase rotation around the signal space in a counter clockwise direction, the remaining most significant bits for each point, if any, being invariant to such rotation.