Analysis of Enhanced-OFDM in Multi-hop Wireless System

Enhanced orthogonal frequency division multiplexing (eOFDM) is one of the promising multicarrier schemes which uses a unique data-dependent pseudorandom (PN) sequence as a guard interval in each OFDM block. The guard interval of eOFDM provides a unique relation between the guard sequence and user data symbols on different subcarriers of the OFDM block, consequently improving the bit error rate (BER) and capacity performances. This paper proposes the eOFDM technique for a multi-hop wireless system and analyzes its performance in Rayleigh fading channel. Precisely, a closed-form expression for the probability density function (PDF) of end-to-end signal to noise ratio (SNR) of a multi-hop system is derived. The system’s outage probability (OP) and ergodic capacity (EC) are analyzed and closed-form expressions for these performance metrics are derived. The simulation results verify the validity of all theoretical derivations. Performance metrics for each hop are investigated over independent Rayleigh fading channels. It is shown that the sum capacity of multi-hop eOFDM system is greater than the conventional multi-hop OFDM system in Rayleigh fading channel for any value of SNR. Additionally, eOFDM system shows lower outage probability than OFDM system in multi-hop scenario.