A Real-Complex Hybrid User Scheduling Algorithm Under the Delay-Restricted Scenario

For delay-restricted multi-slot scenarios, this letter proposes a real-complex hybrid user scheduling (RCHS) algorithm. RCHS is designed for real-complex hybrid modulation (RCHM) and widely-linear receivers. The RCHM allows the user equipment devices (UEs) to transmit symbols through the real or imaginary part of the complex channel. It enables RCHS to have finer scheduling granularity than the complex scheduling algorithms. Because of the finer scheduling granularity, RCHS can achieve higher sum capacity through selection. The RCHS proposed in this letter can enable repeated service of those UEs which bring higher sum capacity gain on multiple slots. Meanwhile, RCHS adopts a low-complexity updating method to improve the sum capacity. Simulation results under interference-limited scenarios demonstrate that the sum capacity of RCHS outperforms the comparative algorithms under both fully- and over-loaded scenarios. And RCHS does not exhibit significant sum capacity loss under lightly over-loaded scenarios.