Improving Data Rate Performance of Non-Orthogonal Multiple Access Based Underwater Acoustic Sensor Networks
In this article, initially we propose an optimal packet size selection scheme for reduced channel time wastage for Non-Orthogonal Multiple Access (NOMA) in Underwater Acoustic Sensor Networks (UASNs). Existing conventional NOMA technique achieves the sum rate without considering the traffic generation in UASNs, which leads to wastage of resources due to unequal transmission times in paired transmission. In contrast, the proposed scheme overcomes this problem by making equal transmission time slots for both weak and strong users using optimal data packet sizes to avoid the wastage of resources. Further, we propose an optimal power allocation for weak and strong users with respect to the distance between transceiving nodes by using particle swarm optimization. The analytical results clearly show that the proposed scheme for NOMA in UASNs significantly improves the data rate performance in comparison with the existing conventional NOMA technique.
KeywordsNon-Orthogonal Multiple Access Underwater Acoustic Sensor Networks Overall data rate
- 1.Al-Abbasi, Z.Q., So, D.K.C.: Power allocation for sum rate maximization in non-orthogonal multiple access system. In: 2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), pp. 1649–1653 (2015)Google Scholar
- 9.Riazul Islam, S.M., Zeng, M., Dobre, O.A.: NOMA in 5G systems: exciting possibilities for enhancing spectral efficiency. CoRR abs/1706.08215 (2017). http://arxiv.org/abs/1706.08215
- 10.Saito, Y., Kishiyama, Y., Benjebbour, A., Nakamura, T., Li, A., Higuchi, K.: Non-orthogonal multiple access (NOMA) for cellular future radio access. In: 2013 IEEE 77th Vehicular Technology Conference (VTC Spring), pp. 1–5 (2013). https://doi.org/10.1109/VTCSpring.2013.6692652