Traceback-performing apparatus in viterbi decoder

Details Traceback-performing apparatus in viterbi decoder Traceback-performing apparatus in viterbi decoder

1995-11-14

1998-01-27

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, 371401, 371 43, 395482, 395494, 365221, H03D 100

Patent

active

057128804

ABSTRACT:
A traceback-performing apparatus includes a first storing portion which receives and stores new path metric values and minimum path metric value so that the first input value is output later and the later input value is output first. A first trace logic portion which receives outputs of the first storing portion and the minimum path metric value and generates a first state which is the next state to be traced. A second storing portion which receives and stores the output of the first storing portion so that the first input value is output first and the later input value is output later. A second trace logic portion which receives the output of the second storing portion and the first state and generates a second state which is the next state to be traced. And, a third storing portion which receives and stores the second state so that the first input value is output later and the later input value is output first so as to find the decoded bits. Therefore, cost is saved in embodying the Viterbi decoder in a VLSI by reducing the required chip area, simplifying address-generation and eliminating the need for global interconnection.

REFERENCES:
patent: 5513139 (1996-04-01), Butler
patent: 5533065 (1996-07-01), Blaker et al.
patent: 5537445 (1996-07-01), Blaker et al.

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