Science and Development Network (SciDev.Net)
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.