Slow fading broadcast channels can model a wide range of applications in wireless networks. Due to delay requirements and the unavailability of the channel state information at the transmitter (CSIT), these channels for many applications are non-ergodic. The appropriate measure for designing signals in non-ergodic channels is the outage probability. In this paper, we provide a method to optimize space-time block codes (STBCs) based on the outage probability at moderate SNRs. Multilevel polar coded-modulation is a new class of coded-modulation techniques that benefits from low-complexity decoders and simple rate matching. In this paper, we derive the outage optimality condition for multistage decoding and propose a rule for determining component code rates. We also derive an upper bound on the outage probability of STBCs for designing the set-partitioning-based labeling. Finally, due to the optimality of the outage-minimized STBCs for long codes, we introduce a novel method for the joint optimization of short-to-moderate length polar codes and STBCs.

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IEEE Transactions on Communications
Department of Systems and Computer Engineering

Khoshnevis, H. (Hossein), Marsland, I, Jafarkhani, H. (Hamid), & Yanikomeroglu, H. (2019). Space-Time Signal Design for Multilevel Polar Coding in Slow Fading Broadcast Channels. In IEEE Transactions on Communications (Vol. 67, pp. 5940–5952). doi:10.1109/TCOMM.2019.2918454