1. A method for receiving a signal at a client device in a wireless communication system, the method comprising: controlling, by a processing device, performing Minimum Mean Square Error-Interference Rejection Combining (MMSE-IRC) processing of the signal based on an estimated covariance matrix, wherein the estimated covariance matrix is determined using reference signals (RS) from a serving base station averaged over a bandwidth length determined based on at least one of a fading profile or Signal-to-Noise (SNR) at the client device.