Constructive Interference-Based Symbol-Level Precoding for Generalized Precoding-Aided Spatial Modulation With PSK Signaling

In this letter, we investigate a constructive interference (CI)-based symbol-level precoder design for systems employing generalized precoding-aided spatial modulation (GPSM) with phase-shift-keying signaling. Unlike existing GPSM precoders, which treat interference as a harmful factor that should be suppressed, the proposed CI-based precoders exploit the interference as a resource to enhance detection performance. We formulate the design problem and then derive efficient precoding algorithms with a new parametrization featuring generalized inverses. Simulation results indicated that the proposed CI-based precoders can drastically outperform a conventional zero-forcing GPSM precoder, especially when the system is operated in strong self-interference configurations.