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Sensors 2017, 17(3), 563; doi:10.3390/s17030563

A Novel Joint Power and Feedback Bit Allocation Interference Alignment Scheme for Wireless Sensor Networks

College of Computer and Communication Engineering, China University of Petroleum (East China), Qingdao 266580, China
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Author to whom correspondence should be addressed.
Academic Editor: Joel J. P. C Rodrigues
Received: 7 January 2017 / Revised: 25 February 2017 / Accepted: 6 March 2017 / Published: 10 March 2017
(This article belongs to the Section Sensor Networks)
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Abstract

It is necessary to improve the energy efficiency of batteries in wireless sensor networks (WSNs). The multiple-input multiple-output (MIMO) technique has become an important means to ameliorate WSNs, and interference management is the core of improving energy efficiency. A promising approach is interference alignment (IA), which effectively reduces the interference and improves the throughput of a system in the MIMO interference channels. However, the IA scheme requires perfect channel state information (CSI) at all transceivers in practice, which results in considerable feedback overhead. Thus, limited IA feedback has attracted much attention. In this paper, we analyze the throughput loss of the K-user MIMO interference channels when each transmitter delivers multiple streams in one slot, and derives the upper-bound of the system interference leakage and throughput loss. Then, to reduce the interference leakage and throughput loss for the MIMO interference alignment with limited feedback, a joint power and feedback bit allocation optimization scheme is proposed. The simulation results show that, compared with the conventional schemes, the presented optimal scheme achieves less residual interference and better performance in the system throughput. View Full-Text
Keywords: wireless sensor networks; MIMO; interference alignment; limited feedback; power allocation; throughput wireless sensor networks; MIMO; interference alignment; limited feedback; power allocation; throughput
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, S.; He, C.; Wang, Y.; Zhang, Y.; Liu, J.; Huang, T. A Novel Joint Power and Feedback Bit Allocation Interference Alignment Scheme for Wireless Sensor Networks. Sensors 2017, 17, 563.

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