Local Oscillators Phase Noise Cancellation Methods

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.

Provided by: IOSR Journal of Engineering Topic: Mobility Date Added: Feb 2013 Format: PDF

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