TY  - EJOU
AU  - Zhang, Yinghua  
AU  - Dong, Yanfang  
AU  - Wang, Lei  
AU  - Liu, Jian  
AU  - Peng, Yunfeng  
AU  - Feng, Jim  

TI  - Outage Capacity Analysis for Cognitive Non-Orthogonal Multiple Access Downlink Transmissions Systems in the Presence of Channel Estimation Error
T2  - Computers, Materials \& Continua

PY  - 2019
VL  - 60
IS  - 1
SN  - 1546-2226

AB  - 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.
KW  - Cognitive radio
KW  -  NOMA
KW  -  serial interference cancellation
KW  -  channel estimation error
KW  -  outage probability

DO  - 10.32604/cmc.2019.05790