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Investigation on link performance modeling of advanced receiver employing interference rejection combining in system level evaluation for LTE-Advanced downlink

This paper investigates an advanced receiver that employs two proposed interference rejection combining (IRC) modeling schemes, one for the covariance matrix and one for channel estimation errors. In a system performance evaluation, the link performance modeling of the IRC receiver, i.e., the output signal-to-interference-plus-noise power ratio (SINR) after IRC reception including the estimation errors, is very important in evaluating the actual performance of the IRC receiver in the system level simulation. This is because these errors affect the suppression of the interference signals for the IRC receiver. The results of simulations assuming the LTE-Advanced downlink with two transmitter and receiver antenna branches show that both proposed schemes accurately approximate the performance of the realistic IRC receiver, which estimates the covariance matrix and channel matrix of the serving cell based on the demodulation reference signal.