Dynamic Power Allocation for Downlink Interference Management in a Two-Tier OFDMA Network
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AbstractWe study the downlink interference problem in a two-tier orthogonal frequency-division multiple-access (OFDMA) system. Assume that macro-and femtotiers share the same spectrum and that the femtotier uses a closed-access scheme. Cross-tier and intercell interference in the two tiers is investigated. Resorting to game theory and variational inequality (VI) theory, we formulate the problem mathematically and design algorithms for the solution. With the algorithms, the femto base stations (FBSs) can dynamically allocate their power according to the feedback from the macrotier to avoid cross-tier interference and to adapt to intercell interference. The overall power allocation of the femtotier reaches an equilibrium, provided that every FBS aims to maximize its own Shannon capacity. The algorithms can be distributively implemented and can mitigate the interference quickly without unnecessary performance loss. Simulation results are provided to demonstrate the performance of our algorithms and to compare with other related algorithms.
All Author(s) ListShen SD, Lok TM
Journal nameIEEE Transactions on Vehicular Technology
Volume Number62
Issue Number8
Pages4120 - 4125
LanguagesEnglish-United Kingdom
KeywordsCross-tier interference; femto-cell; heterogeneous network; interference management; power control; variational inequality theory
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC; Telecommunications; TELECOMMUNICATIONS; Transportation; Transportation Science & Technology; TRANSPORTATION SCIENCE & TECHNOLOGY

Last updated on 2021-09-01 at 00:39