NDLI: A Transformed Conflict Graph-Based Resource-Allocation Scheme Combining Interference Alignment in OFDMA Femtocell Networks

Content Provider	IEEE Xplore Digital Library
Author	Yun Meng Jiandong Li Hongyan Li Miao Pan
Copyright Year	1967
Abstract	To deal with ever-growing wireless services and to increase network throughput, it has been proposed to deploy femtocells with frequency reuse based on orthogonal frequency-division multiple access (OFDMA). However, the interference poses big challenges, particularly for dense deployment scenarios. The resource allocation with joint consideration of subchannel assignment and interference alignment (IA) is different from the traditional problems. First, we need to select the users to perform IA since the number of participant users is limited by the feasibility constraint, and the interference power levels are different due to the path loss. Second, IA increases the degrees of freedom (DoFs) while occupying the additional signal dimension of the participant user; hence, the entirety of the participants in IA require more subchannels compared with the nonparticipants when each of the users transmits the same number of streams. In this paper, we propose a transformed conflict graph-based resource-allocation scheme, where the users are selected according to the effect of IA on the requirement under the feasibility constraint. Then, the subchannel assignment can be modeled as a classical color problem. Extensive simulations show that our scheme can approximate the optimal scheme in a small network and effectively improve the satisfactory ratio of users compared with the scheme without IA in dense femtocell networks.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	4728
Ending Page	4737
Page Count	10
File Size	857336
File Format	PDF
ISSN	00189545
Volume Number	64
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Resource management Femtocell networks Graph theory OFDM Joints Transforms transformed conflict graph resource allocation interference alignment (IA) femtocell interference graph Femtocell
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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