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Coded spread spectrum digital transmission system design study (1974)

Viterbi, A. J. ; Heller, J. A. ; Odenwalder, J. P.

In: CASI

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Publication Date: 2019-06-27

Description: Results are presented of a comprehensive study of the performance of Viterbi-decoded convolutional codes in the presence of nonideal carrier tracking and bit synchronization. A constraint length 7, rate 1/3 convolutional code and parameters suitable for the space shuttle coded communications links are used. Mathematical models are developed and theoretical and simulation results are obtained to determine the tracking and acquisition performance of the system. Pseudorandom sequence spread spectrum techniques are also considered to minimize potential degradation caused by multipath.

Keywords: COMMUNICATIONS

Type: NASA-CR-134310

Format: application/pdf

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