Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1994-09-14
1996-09-17
Tse, Young T.
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375348, H04L 2706, H04L 2722
Patent
active
055576451
ABSTRACT:
A demodulator for demodulating a signal modulated with digital information symbols so as to extract the information symbols is disclosed. A receiver receives a signal over a communications channel and samplers and digitizers produce a sequence of numerical sample values representative of the received signal. Memories are provided each having a number of state memories each associated with a hypothesized symbol string. A controller selectively retrieves values from the memory means and controls the timing of operations thereupon. A metric computer computes candidate metrics using a hypothesis of a next of the information symbols to be demodulated made by the controller, one of the numerical sample values, path metric values, B-matrices, and U-vectors and the candidate metrics associated state number selected by the controller from the memory means. A best predecessor computer determines the best of the candidate metrics to be selected to be written back into the memory means along with a successor B-matrix, U-vector and path history. The successor B-matrices, U-vectors and path history are then updated using corresponding values associated with the best predecessor and one of numerical sample values.
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Yunxin LI et al., "Decoding of Convolutional Codes by Viterbi Blind Algorithm," Communications on the Move, Singapore, ICCS/ISITA '92, pp. 877-881, Nov. 16-20, 1992.
Ericsson-GE Mobile Communications Inc.
Tse Young T.
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