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Quantizing for Correlation Decoding

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1 Author(s)
Blizard, R. ; Martin Marietta Corp., Denver, Colo.

The increase in error rate due to quantizing is examined for the special case of a digital correlation decoder such as can be used for orthogonal and other block codes. Three types of effect are considered separately: 1) the increase in variance, which is proportional to the square of the quantum interval; 2) a threshold, proportional to the quantum interval, caused by the ambiguity when the received signal correlates equally with two code words; 3) the effect of limiting. Approximations are obtained for small quantizing loss, the case of greatest interest since the object of correlation decoding is high efficiency. For a 7-bit biorthogonal code and a total of 16 quantum levels the increase in error rate is computed as a function of the quantum interval, and an optimum is found.

Published in:

Communication Technology, IEEE Transactions on  (Volume:15 ,  Issue: 4 )

Date of Publication:

August 1967

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