ENHANCING SIGNAL ALIGNMENT IN MIMO Y CHANNELS WITH SPACE AND TIME SCHEDULING

Abstract

Spectrum sharing and relaying in wireless networks offer attractive solutions in communication system designs, especially when combined with more advanced signal processing in the terminals and the relays operating in multi-antenna configurations. A promising technique in this area is signal alignment (SA) that efficiently exploits the available throughput in time and spatial domains. This thesis examines the design of signal processing algorithms with SA in networks operating in multiple-input multiple-output (MIMO) Y channel configurations, where multiple terminals communicate with each other in a bi-directional manner via the relay. Two main contributions are presented: (i) the integration of distributed space-time block coding (STBC) and SA in MIMO Y channels is presented for enhancing system reliability of MIMO Y channels (ii) a time scheduling scheme is proposed to address the problem of large antenna number requirements on nodes in generalized MIMO Y channels.