Factors Reducing Call Blocking Probability by Exploiting Erlang B &C Formulas

Abstract

Current and future communication schemes tend to use OFDM systems in order to provide high data transmission and less inter symbol interference.In this paper, we present the benefits of exploiting the a prior information about the structure of the Wireless channel on the performance of channel estimation for orthogonal frequency-division multiplexing (OFDM) systems. The work presented here mainly focus on channel Estimation for the various algorithm techniques which is used for OFDM system. The analytic treatment is complemented by thorough numerical investigation in order to validate the performance of the different techniques. A complete model including in both the time domain and the frequency domain is used for the multicarrier system, which models the received signal to noise ratio (SNR) of each subcarrier and further presents the estimation techniques which is describe the behavior of the OFDM system model in the wireless channel. On the other hand, the fast- varying fading amplitudes are tracked by using least-squares techniques that exploit temporal correlation of the fading process (modal filtering).