On the performance of a widely linear SC-FDE system under multiple independent interferences

Study of Widely Linear SC-FDE Systems for Interference Cancellation

“…It was found out that it has a better error performance and a higher robustness to channel estimation errors when compared to the SL version. Finally in [20] and [21], the authors proposed a WL-MMSE and WL-IB-DFE equalizer respectively for a SC-FDE system under the effect of up to K known interferences. It was seen that the system becomes more robust in terms of BER applying the widely linear equalizers with respect to its SL versions.…”

“…The goal of the present work is to develop analytical expressions for the MSE for the widely linear equalizers presented in [20], [21] in order to obtain the signal-tointerference-plus-noise ratio (SINR) and consequently the analytical BER for the MMSE and IB-DFE equalizers in their strictly and widely linear versions. Results obtained with these expressions were verified and analyzed with respect to the simulation results and the behavior of the system when the number of interferences grows respectively.…”

“…where W is the normalized discrete Fourier transform (DFT) matrix with size N × N and H is a N × N diagonal matrix corresponding to the channel frequency responseh. The same procedure is done for the interference channelsH ik , leading to W H H ik W. The frequency-domain representation of the received signal can be thus written as [20]:…”