Analysis of the Influence of Phase Noise in MIMO OFDM based WLAN systems

The influence of phase noise (PN) on the performance of a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based communication system is analyzed. A PN power weighting function is derived which indicates the influence of the different subcarriers and the shape of the PN spectrum. For compensation of the common phase error (CPE), the maximum likelihood estimation of the CPE is shown to be equal to a determinant criterion optimization. For practical implementation an estimator with reduced complexity is found, for which an upper bound on the error is found. Using this bound the resulting PN spectrum after compensation can be found, which enables the derivation of the effect of the residual PN. The performance of the compensation scheme in an additive white Gaussian noise (AWGN) environment and resulting bit-error-rate (BER) are shown using results from simulations.