Performance analysis of chirp spread spectrum system under mobility scenario

Abstract A wireless communication system using Chirp Spread Spectrum Modulation (CSSM) is analyzed in this study while assuming mobile nodes. CSSM exhibits promising error performance under very low signal-to-noise ratio values. Thereby, CSSM has been adopted in systems that generate low data traffic over long distances, such as low-power wireless networks. Existing studies reveal the significant advantages of CSSM system assuming static nodes. Yet, this article extends the existing analysis by considering mobile nodes. In particular, the error performance of CSSM system under random waypoint mobility model and fading scenarios is investigated. Specifically, Rayleigh fading and Additive White Gaussian Noise (AWGN) channels along with one-dimensional (line), two-dimensional (circle), and three-dimensional (sphere) mobility conditions are considered. A closed-form expression for the average bit error rate (BER) of CSSM system is derived and thoroughly discussed. In addition, simplified asymptotic expressions are obtained for the derived average BER at pragmatic signal to noise ratio (SNR) values along with an approximate expressions assuming pure orthogonal spreading factors. Monte-Carlo simulations are provided to corroborate the accuracy of the conducted analysis, where close-match is reported for wide range of system and channel parameters. In addition, it is reported that distance has considerable impact on the performance, whereas higher mobility dimension induces negligible degradation in performance.