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Complete Complementary Sequences of Different Length
R.S. Raja DURAI Naoki SUEHIRO Chenggao HAN
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E90A
No.7
pp.14281431 Publication Date: 2007/07/01
Online ISSN: 17451337
DOI: 10.1093/ietfec/e90a.7.1428
Print ISSN: 09168508 Type of Manuscript: PAPER Category: Coding Theory Keyword: autocorrelation, crosscorrelation, complete complementary sequences, roworthogonal matrix, columnorthogonal matrix,
Full Text: PDF>>
Summary:
The class of complete complementary sequences (of fixed length) have the ideal correlation properties and are good at increasing the channel usage efficiency but lacks in desirable sequence lengths. In spread spectrum communication systems, sequences having nice correlation properties are important in many ways such as in suppressing multiuser interference, for reliable initial synchronization and in separation of the multipath components. It would be even good if the sequences are easy to construct and have desirable lengths for the system under consideration. In this paper, M sets of sequences that constitute a complete complementary sequences with i^{th} set containing N sequences of length L_{i} each, i = 0, 1, ..., M  1, is defined and a general method that constructs such a class of complete complementary sequences (of different lengths) is given. The proposed class of complete complementary sequences, constituted by sequence sets of different lengths, does not increase the data rates when shortlength sequences are employed.

