Optimal Power Allocation for Wireless Uplink Transmissions Using Successive Interference Cancellation

Abstract

Successive interference cancellation (SIC) is considered to be a promising technique to mitigate multiuser interference and achieve concurrent uplink transmissions, but the optimal power allocation (PA) issue for SIC users is not well addressed. In this article, we focus on the optimization of the PA ratio of users on an SIC channel and analytically obtain the optimal PA ratio with regard to the signal-to-interference-plus-noise ratio (SINR) threshold for successful demodulation and the sustainable demodulation error rate. Then, we design an efficient resource allocation (RA) scheme using the obtained optimal PA ratio. Finally, we compare the proposal with the near-optimum RA obtained by a simulated annealing search and the RA scheme with random PA. Simulation results show that our proposal achieves a performance close to the near-optimum and much higher performance than the random scheme in terms of total utility and Jain's fairness index. To demonstrate the applicability of our proposal, we also simulate the proposal in various network paradigms, including wireless local area network, body area network, and vehicular ad hoc network.

Error-detection-coding-aided iterative hard decision interference cancellation for MIMO systems with HARQ

“…Interference cancellation (IC) schemes [1]- [9] are a reception technique for multiple-input multiple-output (MIMO) systems; these schemes can achieve a high level of performance with reduced computational complexity compared to optimal detection approaches. Among the various IC schemes, successive hard decision IC (SIC) [1]- [3] and iterative hard decision IC (IHIC) [4] [5] utilize hard instead of soft decision values to further reduce the computational complexity. However, if a decoded bit sequence in a hard decision IC scheme contains errors, those errors can be propagated to other decoded bit sequences.…”