BER Improvement Correlation-Flattened Binary CDMA 


Vol. 29,  No. 1, pp. 9-17, Jan.  2004


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  Abstract

We present a performance improvement of Binary CDMA by flattening the correlation values. A Binary CDMA system, in which multi-leveled transmission signal of multi-code CDMA is clipped into a binary value, is cost-efficient since the strict linearity of the power amplifier is relieved. However, a loss of orthogonality among user channels due to the clipping causes the correlation values at the receiver to have a random distribution. If the correlation value for even a single channel goes too low, the average BER drops considerably. We developed a method of correlation flattening, where the binary chip pattern at the transmitter is adjusted so that the correlation values have averaged magnitude. Experimental results on several spreading codes show that the correlation flattening method increases the number of available channels at reduced BER.

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  Cite this article

[IEEE Style]

K. Seo, M. Chong, Y. C. Kim, "BER Improvement Correlation-Flattened Binary CDMA," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 1, pp. 9-17, 2004. DOI: .

[ACM Style]

Keun-Jong Seo, Min-Woo Chong, and Yong Cheol Kim. 2004. BER Improvement Correlation-Flattened Binary CDMA. The Journal of Korean Institute of Communications and Information Sciences, 29, 1, (2004), 9-17. DOI: .

[KICS Style]

Keun-Jong Seo, Min-Woo Chong, Yong Cheol Kim, "BER Improvement Correlation-Flattened Binary CDMA," The Journal of Korean Institute of Communications and Information Sciences, vol. 29, no. 1, pp. 9-17, 1. 2004.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880