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

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.

[1]  Shuangfeng Han,et al.  Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends , 2015, IEEE Communications Magazine.

[2]  Jesus Alonso-Zarate,et al.  Challenges of massive access in highly dense LTE-advanced networks with machine-to-machine communications , 2014, IEEE Wireless Communications.

[3]  Minjoong Rim,et al.  Internet of Things in the 5G Mobile Communication System: The Optimal Number of Channels in Channel Hopping , 2018, Int. J. Networked Distributed Comput..

[4]  Nirwan Ansari,et al.  Edge Computing Aware NOMA for 5G Networks , 2017, IEEE Internet of Things Journal.

[5]  Minjoong Rim,et al.  Frame-Based Random Access with Interference Cancellation across Frames for Massive Machine Type Communications , 2017, Mob. Inf. Syst..

[6]  Yejian Chen,et al.  Comparing IDMA and NOMA with superimposed pilots based channel estimation in uplink , 2015, 2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC).

[7]  Jeffrey G. Andrews,et al.  What Will 5G Be? , 2014, IEEE Journal on Selected Areas in Communications.

[8]  Jing Wang,et al.  Uplink Nonorthogonal Multiple Access in 5G Systems , 2016, IEEE Communications Letters.

[9]  Kai Niu,et al.  Pattern Division Multiple Access—A Novel Nonorthogonal Multiple Access for Fifth-Generation Radio Networks , 2017, IEEE Transactions on Vehicular Technology.

[10]  Bin Xia,et al.  Analysis of the Dynamic Ordered Decoding for Uplink NOMA Systems With Imperfect CSI , 2018, IEEE Transactions on Vehicular Technology.

[11]  Sarah J. Johnson,et al.  On the Fundamental Limits of Random Non-Orthogonal Multiple Access in Cellular Massive IoT , 2017, IEEE Journal on Selected Areas in Communications.

[12]  Robert W. Heath,et al.  Five disruptive technology directions for 5G , 2013, IEEE Communications Magazine.

[13]  Zhi Chen,et al.  Low-Complexity Detector in Sparse Code Multiple Access Systems , 2016, IEEE Communications Letters.

[14]  Taoka Hidekazu,et al.  Scenarios for 5G mobile and wireless communications: the vision of the METIS project , 2014, IEEE Communications Magazine.

[15]  Alexander B. Sergienko,et al.  SCMA detection with channel estimation error and resource block diversity , 2016, 2016 International Siberian Conference on Control and Communications (SIBCON).

[16]  Abd-Elhamid M. Taha,et al.  A survey of access management techniques in machine type communications , 2014, IEEE Communications Magazine.

[17]  Octavia A. Dobre,et al.  Signature-Based Nonorthogonal Massive Multiple Access for Future Wireless Networks: Uplink Massive Connectivity for Machine-Type Communications , 2018, IEEE Vehicular Technology Magazine.

[18]  P. K. Chaturvedi,et al.  Communication Systems , 2002, IFIP — The International Federation for Information Processing.

[19]  Dusit Niyato,et al.  Random access for machine-to-machine communication in LTE-advanced networks: issues and approaches , 2013, IEEE Communications Magazine.

[20]  Liu Long,et al.  A survey: Several technologies of non-orthogonal transmission for 5G , 2015, China Communications.

[21]  Zhi Chen,et al.  Joint Channel Estimation and Multiuser Detection for Uplink Grant-Free NOMA , 2018, IEEE Wireless Communications Letters.