Improper Signaling for Symbol Error Rate Minimization in -User Interference Channel


The rate maximization for the -user interference channels (ICs) has been investigated extensively in the literature. But, the practical drawback of minimizing the error chance with given signal modulations and/or knowledge rates of the users is less studied. In this paper, by utilizing extra degrees of freedom from the improper signaling (versus the conventional proper signaling) , we look for to optimize the precoding matrices for the -user single-input single-output (SISO) ICs to minimize try-wise error chance (PEP) and symbol error rate (SER) with two proposed algorithms, respectively. Compared with conventional proper signaling and other state-of-the-art improper signaling styles, our proposed improper signaling schemes achieve notable error rate improvement in SISO-ICs beneath each the additive white Gaussian noise (AWGN) and cellular system setups with or without channel coding. Our study provides another viewpoint for optimizing transmissions in ICs and additional justifies the sensible profit of improper signaling in interference-limited Communication systems.

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