Throughput Analysis of TDMA System Forward Link with Superposition Coding for Location-Based Sets of Users

Superposition coding can be used to improve capacity of communications in a variety of scenarios. In this paper, we propose a novel location-based data transmission strategy using superposition coding for forward link (FL) of TDMA system with adaptive modulation and coding (AMC). By taking advantage of the total received signal to interference and noise ratio (SINR) disparities on the forward link, the system can transmit to multiple users at the same time and frequency by using superposition coding. The proposed scheme divides the users in a cell into two sets based on their locations. In each time slot, the base station transmits to the selected pair of users belonging to these two sets, respectively, with superposition coding. The average sector throughput of TDMA system with our scheme is mathematically analyzed for a multi-cell scenario. From numerical examples, it is shown that our proposed scheme significantly increases the average throughput of the system.