Open Access

ARTICLE

Outage Capacity Analysis for Cognitive Non-Orthogonal Multiple Access Downlink Transmissions Systems in the Presence of Channel Estimation Error

by Yinghua Zhang¹, Yanfang Dong², Lei Wang¹, Jian Liu¹, Yunfeng Peng¹, Jim Feng³

1 School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
2 Dawning Information Industry Co., Ltd., Beijing, 100193, China.
3 Amphenol Global Interconnect Systems, San Jose, CA 95131, US.

* Corresponding Author: Jian Liu. Email: .

Computers, Materials & Continua 2019, 60(1), 379-393. https://doi.org/10.32604/cmc.2019.05790

Abstract

In this paper, we propose a downlink cognitive non-orthogonal multiple access (NOMA) network, where the secondary users (SUs) operate in underlay mode. In the network, secondary transmitter employs NOMA signaling for downlink transmission, and the primary user (PU) is interfered by the transmission from SU. The expressions for the outage probabilities are derived in closed-form for both primary and secondary users in the presence of channel estimation error. Numerical simulation results show that the channel estimation error and the inter-network interference cause degradation of the downlink outage performance. Also the power allocation and the location have a significant impact on the outage probability. The numerical experiments demonstrate that the analytic expressions of the outage probabilities match with the simulation results.

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Citations