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A Closed-Form BER Expression for Overlap-Based CSS System Design  

Yoon, Tae-Ung (성균관대학교 정보통신공학부)
Lee, Young-Yoon (성균관대학교 정보통신공학부)
Lee, Myung-Soo (성균관대학교 정보통신공학부)
Song, Iick-Ho (한국과학기술원 전자전산학과)
Yoon, Seok-Ho (성균관대학교 정보통신공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.4C, 2009 , pp. 469-475 More about this Journal
Abstract
Overlap is one of the techniques for increasing bit rate in chirp spread spectrum (CSS). More overlaps can offer higher data throughput; however, they may cause more intersymbol interference (ISI) at the same time, resulting in serious bit error rate (BER) performance degradation. Thus, the number of overlaps should be decided according to the required BER performance. In this paper, we derive a closed form expression for BER of the overlap-based CSS system, exploiting the approximated Gaussian Q function. The derived BER expression includes the number of overlaps as a parameter, and thus, would be very useful in determining the number of overlaps for a specified BER. The numerical results demonstrate that the BER derived in a closed form closely agrees with the simulated BER.
Keywords
chirp; chirp spread spectrum (CSS); direct modulation (DM); overlap;
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