NDLI: Design and Performance of Spread Spectrum Karhunen–Loeve Transform for Direct Sequence CDMA Communications

Content Provider	IEEE Xplore Digital Library
Author	Akansu, A.N. Poluri, R.
Copyright Year	1994
Abstract	In this letter, the eigen-analysis-based optimal design method of orthogonal block transform, the so-called Karhunen-Loeve transform, is used to generate a new family of spread spectrum codes. These spread spectrum and varying power orthogonal codes might find their application in direct sequence code division multiple access (CDMA) communications. The basis functions of the proposed transform are jointly spread in the time and frequency domains. This property is in contrast with the traditional optimal block transforms maximizing energy compaction due to their frequency localized basis magnitude functions desired in source coding and spectral processing applications. Bit-error rate (BER) performance of the proposed CDMA spreading codes under both additive white Gaussian noise (AWGN) and Rayleigh flat fading channel conditions are compared with the industry standard codes like Walsh and Gold families. It is shown in this letter that the proposed technique allows us to design orthogonal spreading codes with flexible lengths that perform comparable to or better than the Gold and Walsh codes.
Sponsorship	IEEE Signal Processing Society
Starting Page	900
Ending Page	903
Page Count	4
File Size	307708
File Format	PDF
ISSN	10709908
Volume Number	14
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spread spectrum communication AWGN Karhunen-Loeve transforms Multiaccess communication Bit error rate Gold Design methodology Direct-sequence code-division multiple access Frequency domain analysis Compaction Karhunen–Loeve transform (KLT) Bit error rate (BER) code division multiple access (CDMA) fixed and varying power spreading codes
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Signal Processing Electrical and Electronic Engineering

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