By Topic

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

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Akansu, A.N. ; Inst. of Technol., Newark ; Poluri, R.

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.

Published in:

Signal Processing Letters, IEEE  (Volume:14 ,  Issue: 12 )