Kabushiki Kaisha Toshiba

University of Bristol

Robert Jan Piechocki

Mong Suan Yee

Cheran Malsri Vithanage

Christophe Andrieu

Dino Sejdinovic

Encoding of a message is conducted using codewords selected from a codebook. The selected codewords are used to construct a corresponding plurality of waveforms, which are then weighted and added to form a signal for transmission. At a receiver, channel impulse response is used to determine which codewords from the known codebook have been used, and by which weights from a known constellation of weights the resultant waveforms have been weighted. A message embedded in a received signal can then be detected.

Communication system, method and apparatus

This invention generally relates to methods, apparatus and computer program code for decoding signals, and more particularly to trellis-based decoding using a variant of a BCJR procedure. The invention includes a trellis decoder for decoding symbols of a received signal, the symbol including a sequence defined by transitions between states of a trellis, the trellis decoder including: means for performing a forward recursion through the trellis to determine a first set of probabilities (&#x3b1;(X)) each defining a probability of a said trellis state (X) responsive to one or more current or earlier received signal values (y); means for providing a second set of (&#x3b2;(X)) probabilities each defining a probability of one or more received signal values (y) given an earlier the trellis state (X); means to decode the received signal to determine probabilities (p(b|y)) for symbols of a corresponding transmitted sequence of symbols from the first and second sets of probabilities; and where the decoder further includes: means to select states for determining the first set of probabilities responsive to one or more received signal values later than a the trellis state defining a probability in said first set.

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Bristol, United Kingdom

Robert Jan Piechocki