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Sensors 2018, 18(2), 639; https://doi.org/10.3390/s18020639

Robust Rate Maximization for Heterogeneous Wireless Networks under Channel Uncertainties

1,2
,
1
and
1,*
1
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2
State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China
*
Author to whom correspondence should be addressed.
Received: 20 January 2018 / Revised: 9 February 2018 / Accepted: 17 February 2018 / Published: 21 February 2018
(This article belongs to the Special Issue Advances on Resources Management for Multi-Platform Infrastructures)
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Abstract

Heterogeneous wireless networks are a promising technology in next generation wireless communication networks, which has been shown to efficiently reduce the blind area of mobile communication and improve network coverage compared with the traditional wireless communication networks. In this paper, a robust power allocation problem for a two-tier heterogeneous wireless networks is formulated based on orthogonal frequency-division multiplexing technology. Under the consideration of imperfect channel state information (CSI), the robust sum-rate maximization problem is built while avoiding sever cross-tier interference to macrocell user and maintaining the minimum rate requirement of each femtocell user. To be practical, both of channel estimation errors from the femtocells to the macrocell and link uncertainties of each femtocell user are simultaneously considered in terms of outage probabilities of users. The optimization problem is analyzed under no CSI feedback with some cumulative distribution function and partial CSI with Gaussian distribution of channel estimation error. The robust optimization problem is converted into the convex optimization problem which is solved by using Lagrange dual theory and subgradient algorithm. Simulation results demonstrate the effectiveness of the proposed algorithm by the impact of channel uncertainties on the system performance. View Full-Text
Keywords: heterogeneous wireless networks; femtocell networks; channel uncertainties; robust resource allocation; quality of service heterogeneous wireless networks; femtocell networks; channel uncertainties; robust resource allocation; quality of service
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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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Xu, Y.; Hu, Y.; Li, G. Robust Rate Maximization for Heterogeneous Wireless Networks under Channel Uncertainties. Sensors 2018, 18, 639.

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