Three-Hop Untrusted Relay Networks With Hardware Imperfections and Channel Estimation Errors for Internet of Things

2020 ◽  
Vol 15 ◽  
pp. 2856-2868 ◽  
Author(s):  
Mehdi Letafati ◽  
Ali Kuhestani ◽  
Hamid Behroozi
Keyword(s):  
Internet Of Things ◽  
Channel Estimation ◽  
Relay Networks ◽  
Estimation Errors ◽  
Channel Estimation Errors ◽  
Untrusted Relay

scholarly journals On Maximum of Energy-Efficiency in Amplify-and-Forward Relay Networks Under Channel Estimation Errors

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 149641-149648
Author(s):  
Mengmeng Xu ◽  
Fei Liu ◽  
Hengzhou Xu ◽  
Hai Zhu ◽  
Baofeng Wang
Keyword(s):  
Energy Efficiency ◽  
Channel Estimation ◽  
Relay Networks ◽  
Amplify And Forward ◽  
Estimation Errors ◽  
Channel Estimation Errors

scholarly journals Uplink Non-Orthogonal Multiple Access with Channel Estimation Errors for Internet of Things Applications

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 912
Author(s):  
Minjoong Rim ◽  
Chung Kang
Keyword(s):  
Internet Of Things ◽  
Channel Estimation ◽  
Communication Systems ◽  
Multiple Access ◽  
Base Station ◽  
Shared Resources ◽  
Estimation Errors ◽  
Channel Estimation Errors ◽  
Pilot Symbols ◽  
Shift Keying

One of the key requirements for next generation wireless or cellular communication systems is to efficiently support a large number of connections for Internet of Things (IoT) applications, and uplink non-orthogonal multiple access (NOMA) schemes can be used for this purpose. In uplink NOMA systems, pilot symbols, as well as data symbols can be superimposed onto shared resources. The error rate performance can be severely degraded due to channel estimation errors, especially when the number of superimposed packets is large. In this paper, we discuss uplink NOMA schemes with channel estimation errors, assuming that quadrature phase shift keying (QPSK) modulation is used. When pilot signals are superimposed onto the shared resources and a large number of devices perform random accesses concurrently to a single resource of the base station, the channels might not be accurately estimated even in high SNR environments. In this paper, we propose an uplink NOMA scheme, which can alleviate the performance degradation due to channel estimation errors.

Joint Impact of RF Hardware Impairments and Channel Estimation Errors in Spectrum Sharing Multiple-Relay Networks

2018 ◽  
Vol 66 (9) ◽  
pp. 3809-3824 ◽  
Author(s):  
Sourabh Solanki ◽  
Prabhat K. Upadhyay ◽  
Daniel Benevides da Costa ◽  
Petros S. Bithas ◽  
Athanasios G. Kanatas ◽  
...  
Keyword(s):  
Channel Estimation ◽  
Spectrum Sharing ◽  
Relay Networks ◽  
Estimation Errors ◽  
Channel Estimation Errors ◽  
Hardware Impairments ◽  
Multiple Relay

Performance Analysis of Relay Selection in Two-Way Relay Networks With Channel Estimation Errors

2015 ◽  
Vol 61 (3) ◽  
pp. 482-493 ◽  
Author(s):  
Jyun-Wei Pu ◽  
Tsang-Yi Wang ◽  
Sheng-Hung Li ◽  
Chih-Peng Li ◽  
Hsueh-Jyh Li
Keyword(s):  
Performance Analysis ◽  
Channel Estimation ◽  
Relay Selection ◽  
Relay Networks ◽  
Estimation Errors ◽  
Channel Estimation Errors
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