Provided by: Science and Development Network (SciDev.Net)
Date Added: Jun 2012
Phase noise is produced in local oscillator or PLL (Phase Locked Loop), which affects seriously BER performance of the OFDM (Orthogonal Frequency Division Multiplexing) system. ICI (Inter-Sub-Carrier-Interference) caused by the phase noise is a serious problem. In this paper, two modified ICI self-cancellation methods are proposed and compared for the performance evaluation. In the original OFDM system, the proposed symmetric data-conjugate method has the best ICI minimization capability, which becomes gradually degraded according to the order of symmetric data-conjugate method, data-conjugate method, symmetric data-conversion method and data-conversion method. When phase noise dominates in the OFDM system, symmetric data-conjugate method can result in the best BER performance, when HPA nonlinearity cannot be neglected, data-conjugate method achieves the best BER performance.