Robust power allocation for NOMA in heterogeneous vehicular communications with imperfect channel estimation

Document Type

Conference Proceeding

Publication Date

7-2-2017

Abstract

In heterogeneous vehicular networks, power control with non-orthogonal multiple access (NOMA) is effective in improving spectrum efficiency by allowing multiple users to share the same channel. However, the channel estimation error caused by high mobility in vehicular communications needs to be considered for efficient power allocation and link reliability. In this paper, a robust power allocation problem with chance constraints is studied to improve at the same time the throughput performance and reliability of NOMA heterogeneous vehicular communications. Through the approximation of non-central Chi-square distribution, the chance constraints are transformed into deterministic constraints. Moreover, the optimal power allocation is obtained with the consideration of NOMA requirements. Simulation results illustrate the effectiveness of the proposed power allocation and its improvement over existing schemes.

Publication Source (Journal or Book title)

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

First Page

1

Last Page

5

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