Analysis of cyclic prefix length effect on ISI limitation in OFDM system over a Rayleigh-fading multipath

In this work, the influence of the cyclic prefix on the performance of the OFDM system is studied. We worked out an OFDM transceiver using a 16 QAM modulation scheme, a comparison of the BER for various lengths of the cyclic prefix has been achieved, and the influence of the noise introduced in the channel has been highlighted, for both a Gaussian and Rayleigh noise. The simulation was carried out on MATLAB where the curves of the BER for various lengths of the cyclic prefix are given and compared. We also adopted as a metric the QAM constellation to show the dispersion of the carriers as a consequence of the transmission channel, the mitigation of this effect by the CP is noticeable

Analytical model for life time in wirless sensor networks

Numerous analytical models have been proposed to evaluate the performance of wireless sensor networks, therefore, analytical models providing a clear understanding of the fundamental limitations of different systems, as well as a convenient way to review their performance and optimize their parameters are necessary. In this paper, we propose an analytical framework model that defines the performance of a sensor network, with an emphasis on an analytic model that is based on the lifetime, the offered traffic, and the maximum number of retransmissions Kmax