Novel architectures for squares, and sums of squares, of cross-correlations of bipolar sequences with applications to CDMA

Chapter Title

Novel architectures for squares, and sums of squares, of cross-correlations of bipolar sequences with applications to CDMA

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Department

Electronics & Communications Engineering Department

Description

This paper describes novel architectures for computing squares, and sums of squares, of cross-correlations of bipolar sequences. Both metrics are used in improved channel decoder metrics for CDMA systems, but also appear in other signal processing applications. The key idea is to compute outer products of each code vector with itself, and formulate the metrics so as to avoid explicit computation of cross-correlations. The expensive squaring unit is also eliminated. A detailed complexity analysis is carried out in which we demonstrate the advantages of these architectures. They also offer easier updates when there are incremental changes in the system. We also describe a few variations and special cases including short codes and asynchronous users, and point out further enhancements. © 2013 IEEE.

Publication Date

1-1-2013

Document Type

Book Chapter

Book Title

Conference Record - Asilomar Conference on Signals, Systems and Computers

ISBN

9781479923908

Publisher

IEEE

City

Piscataway, NJ

First Page

520

Last Page

524

Novel architectures for squares, and sums of squares, of cross-correlations of bipolar sequences with applications to CDMA

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