Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels
In this paper, we investigate a downlink cooperative non-orthogonal multiple access (NOMA) network with decode-and-forward relaying, where two scenarios of user relaying with direct link and user relaying without direct link are discussed in detail. More particularly, the performance of cooperative...
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doaj-baec5cc17eaa405faa2db89f54e009e52020-11-25T03:35:38ZengMDPI AGSensors1424-82202020-01-0120242410.3390/s20020424s20020424Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading ChannelsXianli Gong0Xinwei Yue1Feng Liu2School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaSchool of Information and Communication Engineering, Beijing Information Science and Technology University, Beijing 100101, ChinaSchool of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaIn this paper, we investigate a downlink cooperative non-orthogonal multiple access (NOMA) network with decode-and-forward relaying, where two scenarios of user relaying with direct link and user relaying without direct link are discussed in detail. More particularly, the performance of cooperative NOMA system under the assumption of imperfect channel state information (ipCSI) is studied over Nakagami-<i>m</i> fading channels. To evaluate the outage performance of the above discussed two scenarios, the closed-form expressions of outage probability for a pair of users are derived carefully. The diversity orders of users are achieved in the high signal-to-noise region. An error floor appears in the outage probability owing to the existence of channel estimation errors under ipCSI conditions. Simulation results verify the validity of our analysis and show that: (1) NOMA is superior to conventional orthogonal multiple access; (2) The best user relaying location for cooperative NOMA networks should be near to the base station; and (3) The outage performance of distant user with direct link significantly outperforms distant user without direct link by comparing the two scenarios.https://www.mdpi.com/1424-8220/20/2/424cooperative non-orthogonal multiple accessdecode-and-forwardimperfect channel state informationoutage probability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xianli Gong Xinwei Yue Feng Liu |
spellingShingle |
Xianli Gong Xinwei Yue Feng Liu Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels Sensors cooperative non-orthogonal multiple access decode-and-forward imperfect channel state information outage probability |
author_facet |
Xianli Gong Xinwei Yue Feng Liu |
author_sort |
Xianli Gong |
title |
Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels |
title_short |
Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels |
title_full |
Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels |
title_fullStr |
Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels |
title_full_unstemmed |
Performance Analysis of Cooperative NOMA Networks with Imperfect CSI over Nakagami-<i>m</i> Fading Channels |
title_sort |
performance analysis of cooperative noma networks with imperfect csi over nakagami-<i>m</i> fading channels |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2020-01-01 |
description |
In this paper, we investigate a downlink cooperative non-orthogonal multiple access (NOMA) network with decode-and-forward relaying, where two scenarios of user relaying with direct link and user relaying without direct link are discussed in detail. More particularly, the performance of cooperative NOMA system under the assumption of imperfect channel state information (ipCSI) is studied over Nakagami-<i>m</i> fading channels. To evaluate the outage performance of the above discussed two scenarios, the closed-form expressions of outage probability for a pair of users are derived carefully. The diversity orders of users are achieved in the high signal-to-noise region. An error floor appears in the outage probability owing to the existence of channel estimation errors under ipCSI conditions. Simulation results verify the validity of our analysis and show that: (1) NOMA is superior to conventional orthogonal multiple access; (2) The best user relaying location for cooperative NOMA networks should be near to the base station; and (3) The outage performance of distant user with direct link significantly outperforms distant user without direct link by comparing the two scenarios. |
topic |
cooperative non-orthogonal multiple access decode-and-forward imperfect channel state information outage probability |
url |
https://www.mdpi.com/1424-8220/20/2/424 |
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