Proceedings ArticleDOI
A low complexity algorithm for proportional resource allocation in OFDMA systems
I.C. Wong,Zukang Shen,Brian L. Evans,Jeffrey G. Andrews +3 more
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This paper considers basestation allocation of subcarriers and power to each user to maximize the sum of user data rates, subject to constraints on total power, bit error rate, and proportionality among users data rates.Abstract:
Orthogonal frequency division multiple access (OFDMA) basestations allow multiple users to transmit simultaneously on different subcarriers during the same symbol period. This paper considers basestation allocation of subcarriers and power to each user to maximize the sum of user data rates, subject to constraints on total power, bit error rate, and proportionality among user data rates. Previous allocation methods have been iterative nonlinear methods suitable for offline optimization. In the special high subchannel SNR case, an iterative root-finding method has linear-time complexity in the number of users and N log N complexity in the number of subchannels. We propose a non-iterative method that is made possible by our relaxation of strict user rate proportionality constraints. Compared to the root-finding method, the proposed method waives the restriction of high subchannel SNR, has significantly lower complexity, and in simulation, yields higher user data rates.read more
Citations
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Journal ArticleDOI
Radio Resource Allocation Algorithms for the Downlink of Multiuser OFDM Communication Systems
TL;DR: No matter which optimization method is used, in both classes, the overall performance is improved with the increase in the number of users, due to multiuser diversity.
Journal ArticleDOI
Adaptive Interference Management of OFDMA Femtocells for Co-Channel Deployment
Ji-Hoon Yun,Kang G. Shin +1 more
TL;DR: This work proposes a distributed and self-organizing femtocell management architecture, called the Complementary TRi-control Loops (CTRL), that requires neither special hardware nor change to the radio resource management of existing macrocells, thus facilitating non-disruptive penetration of femtocells.
Proceedings ArticleDOI
Algorithms for routing and centralized scheduling to provide QoS in IEEE 802.16 mesh networks
Harish Shetiya,Vinod Sharma +1 more
TL;DR: This work first fixes the routing, then presents scheduling algorithms which provide per flow QoS guarantees to real and interactive data applications while utilizing the network resources efficiently.
Journal ArticleDOI
Energy-Efficient Resource Allocation in OFDM Systems With Distributed Antennas
TL;DR: This paper develops an energy-efficient resource-allocation scheme with proportional fairness for downlink multiuser orthogonal frequency-division multiplexing (OFDM) systems with distributed antennas and develops a low-complexity suboptimal algorithm, which separates subcarrier allocation and power allocation.
References
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Journal ArticleDOI
Handbook of Mathematical Functions
Journal ArticleDOI
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
TL;DR: The results show that the proposed algorithm outperforms multiuser OFDM systems with static time-division multiple access (TDMA) or frequency-divisionmultiple access (FDMA) techniques which employ fixed and predetermined time-slot or subcarrier allocation schemes.
Journal ArticleDOI
Errata: Milton Abramowitz and Irene A. Stegun, editors, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, National Bureau of Standards, Applied Mathematics Series, No. 55, U.S. Government Printing Office, Washington, D.C., 1994, and all known reprints
K. S. Kölbig,F. Schäff +1 more
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