Adaptive Rate Allocation Scheme for Uplink TH-UWB Networks

In this paper, an efficient rate allocation scheme to maximize the throughput in uplink multi-rate time-hopping ultra-wideband (TH-UWB) communications is proposed. This is a challenging task due to the lack of a suitable closed form expression of the multiuser interference in a multi-rate context. Moreover, an exhaustive search for the optimal solution would be too prohibitive due to the high complexity induced. Our contribution can be summarized as follows: i) A new expression of the multiuser interference variance accounting for multi-rate communications is proposed. ii) Thanks to this, a computational efficient multi-rate allocation scheme is proposed. The algorithm allows to achieve high throughput while keeping a relatively low starvation rate and it outperforms a Max-Min algorithm with a fix rate for all users. Moreover, the simulations based on the theoretical analysis give insights on the influence of the different UWB parameters on the global throughput.