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Interference is traditionally viewed as a performance limiting factor inwireless communication systems, which is to be minimized or mitigated.Nevertheless, a recent line of work has shown that by manipulating theinterfering signals such that they add up constructively at the receiver side,known interference can be made beneficial and further improve the systemperformance in a variety of wireless scenarios, achieved by symbol-levelprecoding (SLP). This paper aims to provide a tutorial on interferenceexploitation techniques from the perspective of precoding design in amulti-antenna wireless communication system, by beginning with theclassification of constructive interference (CI) and destructive interference(DI). The definition for CI is presented and the corresponding mathematicalcharacterization is formulated for popular modulation types, based on whichoptimization-based precoding techniques are discussed. In addition, theextension of CI precoding to other application scenarios as well as forhardware efficiency is also described. Proof-of-concept testbeds aredemonstrated for the potential practical implementation of CI precoding, andfinally a list of open problems and practical challenges are presented toinspire and motivate further research directions in this area.

Interference Exploitation via Symbol-Level Precoding: Overview, State-of-the-Art and Future Directions