Spectral analysis of polynomial nonlinearity with applications to RF power amplifiers
EURASIP Journal on Applied Signal Processing
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Performance analysis of equalized OFDM systems in Rayleigh fading
IEEE Transactions on Wireless Communications
Narrowband interference rejection in OFDM via carrier interferometry spreading codes
IEEE Transactions on Wireless Communications
PAPR reduction of the low complexity phase weighting method in OFDM communication system
IEEE Transactions on Consumer Electronics
Effect of nonlinear amplifier in companded OFDM with application to 802.11n WLAN
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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It is a well known fact that Orthogonal Frequency Division Multiplexing (OFDM) suffers from high peak to average power ratio (PAPR). The nonlinear distortion introduced by an OFDM signal through practical amplifiers can further degrade the system performance. Due to the limited bandwidth in the radio frequency spectrum, it is impossible that wireless communication systems can operate in an environment which is free from all interference such as narrowband interference (NBI). Hence, it is important to understand how an OFDM system performs when it is subject to NBI interference. In this paper, we analyze the performance of a M-ary Quadrature Amplitude Modulation (MQAM) OFDM system which is subject to nonlinear high power amplifiers (HPAs) and NBI in a Rayleigh fading channel. In order to reduce the nonlinear distortion caused by HPAs, we propose a new companding technique to reduce the PAPR and a novel receiver structure to minimize the degradation effects from the decompander when the OFDM system operates in Rayleigh fading channel. For the purpose of simulation, we extend the analytical model to be in compliance with the IEEE 802.11n standard. The theoretical results are verified with the simulation.