Blind Channel Estimation for MIMO Systems with Nonlinearities at the Receiver

This paper describes blind channel estimation for MIMO systems where there are nonlinear distortions in the receiver. The usual source of nonlinearity at the receiver is the front-end amplifier. A recursive algorithm estimates and tracks the channel through unscented transformation. Bussgang´s theorem is used to model the in-band distortion comprising a bandpass, memoryless nonlinearity. Simulations demonstrate the excellent accuracy of the algorithm and its power in compensating the effects of distortion. A realistic nonlinearity is almost completely compensated, for small- to mid-values of SNR.