Asynchronous multicarrier DS-CDMA using mutually orthogonal complementary sets of sequences

Shu Ming Tseng, Mark R. Bell

Research output: Contribution to journalJournal Article peer-review

115 Scopus citations

Abstract

The use of sets of multiple spreading sequences per user in multicarrier code-division multiple-access (CDMA) is investigated. Each user is assumed to have a distinct set of spreading sequences, with a different spreading sequence for each carrier in each user's set. We show that when these sets of sequences are chosen to be the mutually orthogonal (MO) complementary sets of sequences, multiple-access interference is minimal on a nonfading channel. As a result of the autocorrelation sidelobe cancellation properties of the MO complementary sequences, it is possible to pack symbols more closely together on the nonfading channel, resulting in a higher data rate than in multicarrier CDMA using the same spreading sequence for each carrier. The resulting communication system scheme results in an easily parallelized receiver architecture that may be useful in nonfading coherent channels, such as the optical fiber channel or the Rician channel with a strong line-of-sight component. On the Rayleigh fading channel, the performance of the system is identical to that of multicarrier CDMA employing a single spreading sequence per user, with only a minimal increase in receiver complexity.

Original languageEnglish
Pages (from-to)53-59
Number of pages7
JournalIEEE Transactions on Communications
Volume48
Issue number1
DOIs
StatePublished - 2000
Externally publishedYes

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