An Enhanced Inter-carrier Interference Reduction Scheme for OFDM System with Phase Noise
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An Enhanced Inter-carrier Interference Reduction Scheme for OFDM System with Phase Noise B. Senthil · R. Aravind · K.M.M. Prabhu
Received: 7 April 2012 / Revised: 3 August 2012 / Published online: 24 August 2012 © Springer Science+Business Media, LLC 2012
Abstract Inter-carrier interference (ICI) reduction techniques achieve a better carrier-to-interference ratio (CIR) in OFDM system in the presence of synchronisation errors. However, the frequency diversity available on the frequency-selective channel has not been utilised by conventional ICI reduction techniques. In this paper, the frequency diversity of ICI reduction methods in the presence of phase noise over frequency-selective fading channels is analysed. Based on the analysis, an ICI reduction technique is proposed, enhanced symmetric data-conjugate (ESDC) technique, to enhance the frequency diversity in multipath fading channel. The carrier-tointerference ratio (CIR) and common phase error (CPE) of the proposed ICI reduction scheme are derived and the BER performance of the proposed system is compared with the conventional ICI reduction methods such as adjacent data-conjugate (ADC) and symmetric data-conjugate (SDC) methods. Simulation results reveal that the proposed ICI reduction scheme provides an improvement in BER performance over a fading channel and it is also better than conventional ICI reduction techniques in the presence of ICI due to phase noise. Keywords OFDM · Phase noise · ICI reduction scheme · Adjacent data-conjugate · Symmetric data-conjugate · Frequency diversity · Phase noise B. Senthil () ECE Department, Prathyusha Institute of Technology and Management, Tiruvallur, Chennai, India e-mail: [email protected] R. Aravind · K.M.M. Prabhu EE Department, Indian Institute of Technology Madras, Chennai 600036, India R. Aravind e-mail: [email protected] K.M.M. Prabhu e-mail: [email protected]
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Circuits Syst Signal Process (2013) 32:931–943
1 Introduction Orthogonal frequency division multiplexing (OFDM) is a bandwidth efficient modulation and has been employed in next generation broadband wireless communication due to its robustness to the multipath fading channel and low complexity frequency domain equaliser [2, 6, 18]. The main drawback of an OFDM system is that it is sensitive to synchronisation errors such as frequency offset [14] and phase noise [1] from the receiver oscillator. These errors cause inter-carrier interference (ICI), which in turn destroys the orthogonality of the carriers. Two approaches have been reported to mitigate the effect of frequency offset/phase noise in OFDM systems. One approach is to estimate and compensate the frequency offset/phase noise at the receiver [3, 13]. Another approach is to use signal processing techniques in the transmitter for reducing/canceling the effect of frequency offset/phase noise [7, 10, 12, 15–17, 19, 21, 22]. This paper focuses on the signal processing methods to overcome the effect of ICI due to phase noise from the receiver oscillator of the OFDM system. In the signal pro
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