Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1996-11-05
1999-06-29
Chin, Stephen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
371 437, 360 29, 360 39, H03M 1300, G11B 2018
Patent
active
059178639
ABSTRACT:
A Viterbi decoding circuit for decoding an input signal is provided. The circuit contains a detector, a first converter, a Viterbi decoder, a second converter, and a selector. The input signal is grouped into a current and subsequent input signal group. The detector detects negative peak data values and positive peak data values from the current input signal group. The first converter converts the positive and negative peak data in a reverse direction to produce reverse positive and negative peak data, respectively. The Viterbi-decoder decodes the reverse positive and negative peak data with respect to a predetermined number of initial states and generates current reverse decoded data groups which respectively correspond to a plurality of channels and respectively correspond to the initial states. In addition, the Viterbi decoder generates a control signal based on a state of initial decoded data corresponding to the subsequent input signal group. The second converter converts the current reverse decoded data groups in a forward direction to produce current forward decoded data groups for the channels, respectively. The selector selects a particular current forward decoded data group for a particular channel based on the control signal. In addition, a method which is performed by the circuit is also provided.
REFERENCES:
patent: 5373400 (1994-12-01), Kovacs
patent: 5392316 (1995-02-01), Sawaguchi et al.
Raphaeli, D. and Kaitz, T., "A Reduced Complexity Algorithm for Combined Equalization and Decoding for Channels with Multipath, ISI or Partial Response," Proc. 1995 IEEE Global Telecomm. Conf., pp. 83-87, Nov. 1995.
Jeon Jin-Kyu
Soichi Iwamura
Chin Stephen
Gluck Jeffrey W.
Samsung Electronics Co,. Ltd.
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