H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 1/12 (2006.01) H03M 13/00 (2006.01) H03M 13/23 (2006.01) H03M 13/41 (2006.01) H04L 1/00 (2006.01)
Patent
CA 2178448
The invention provides a decoder of symbols of received data, the data being encoded according to a convolutional encoding scheme and transmitted through a communications channel. The data is punctuated according to a puncturing matrix, and has a plurality of state values which describe a sequence of state transitions. The decoder has a generation unit that accepts the received data for calculating metrics of the transitions thereof. A selector responsive to the generation unit selects a path of transitions corresponding to the path produced by a transmitter of the data stream. A traceback unit maintains historical information representative of sequential decision operations of the selector. A counter is provided for counting illegal state transitions of the path selected by the selector, and a control unit, responsive to the counter, determines a puncture rate and adjusts a puncture phase of the received data. The decoder can be used in a VLSI receiver circuit which is adapted to the reception of QPSK modulated data.
Claydon Anthony Peter John
Foxcroft Thomas
Gammack Richard John
Kuligowski Andrew Peter
Macfarlane Charles Dunlop
Discovision Associates
Smart & Biggar
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