Downlink NOMA Based Transmission Protocol for Performance Improvement in Time-Varying Wireless Network

Abstract

In this research work, the authors propose an error constrained data transmission approach using non-orthogonal multiple access (NOMA) protocol with hybrid automatic repeat request (HARQ) and different packet combining schemes. In this proposed work, the transmitter simultaneously transmits two data packets to the users (UEs) by considering the superposition coding technique in the power domain. The decoding scheme of the receiver changes according to the message decoding status in the previous rounds. This combined protocol has the capability of realizing ultra-reliability, error correction power in high error prone wireless links. The receiver adopts successive interference cancelation (SIC) to decode its own packet. Retransmission process is performed when the data is erroneously received by the destination and the receiver corrects the error by applying HARQ with Packet Combining (HARQ-PC) and HARQ with Aggressive Packet Combining (HARQ-APC) schemes. This paper analyzes the data rates, outage probabilities and bit error rates of UEs for downlink NOMA systems with respect to the transmit power using some basic parameters. The proposed schemes can greatly outperform the conventional NOMA with HARQ (NOMA-HARQ) in terms of data rates, outage probability and bit error rate in dynamic wireless channels.

KEYWORDS:

• Acknowledgement (ACK)
• Aggressive packet combining (APC)
• Bit error rate
• Hybrid automatic repeat request (HARQ)
• Negative ACK (NACK)
• Non-orthogonal multiple access (NOMA)
• Outage probability
• Packet combining (PC)
• Transmit power

ACKNOWLEDGEMENTS

We would like to thank Director Prof. Pinakeswar Mahanta for his continuous support and careful guidance. Also, we are highly grateful to NIT Arunachal Pradesh, where we could have the environment to complete this work.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Debbarni Sarkar

Debbarni Sarkar, her research interest is in wireless communication, 5G technology, non-orthogonal multiple access, hybrid automatic repeat request (HARQ) protocols.

Yaka Bulo

Yaka Bulo, is an assistant professor at National Institute of Technology Arunachal Pradesh in the Department of Electronics and Communication Engineering. Her areas of interest are wireless communication, wireless sensor network, error control techniques, 5G technology, non-orthogonal multiple access, hybrid automatic repeat request (HARQ) protocols. Email: [email protected]