Local Oscillators Phase Noise Cancellation Methods

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Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme that employs a large number of orthogonal Closely-spaced sub-carriers. Each sub-carrier is modulated with a modulation scheme (QPSK or QAM generally) at a low symbol rate. Each of the sub-carrier is then multiplexed together and this forms the OFDM signal. In practice OFDM signals are generated and detected using the Fast Fourier Transform Algorithm. OFDM is a widely recognized modulation scheme for high data rate communications. However, the implementation of OFDM systems suffers from the phase noise introduced by the local oscillator causes two effects: the Common Phase Error (CPE), and The Inter Carrier Interference (ICI). In this paper, the authors address the problem of phase noise suppression in Orthogonal Frequency Division Multiplexing (OFDM) systems.