Proceedings ArticleDOI
Fairness-based resource allocation in OFDMA downlink with imperfect CSIT
Maria George,R. David Koilpillai +1 more
- pp 1-6
TLDR
The proposed resource allocation scheme achieves a good balance between throughput and fairness at low complexity under conditions of imperfect CSIT, and achieves high value of Jain's fairness index.Abstract:
OFDMA is one of the promising technologies which can provide high speed wireless data with high spectral efficiency. This paper focuses on the efficient management of resources - power, rate and subcarriers on the OFDMA downlink. A novel approach of considering three factors together for OFDMA resource allocation - imperfect Channel State Information at Transmitter (CSIT), outage, and fairness is presented in this paper. The resource allocation scheme is split into two steps - rate & power allocation step, and subcarrier allocation step. To reduce complexity, equal power allocation is assumed and optimal rate to be allocated on each link to maximise throughput is determined. Then in the second step, heuristic strategies are proposed for subcarrier allocation which will incorporate fairness. We consider methods to ensure both short-term and long-term fairness and also inclusion of fairness among users with different rate requirements. The effectiveness of the proposed scheme is demonstrated through simulations. In terms of throughput, the proposed scheme bridges the gap between perfect and imperfect CSIT, and achieves high value of Jain's fairness index. At the same time, there is minimal degradation in throughput in comparison to the performance of throughput-maximising schemes. Thus the proposed resource allocation scheme achieves a good balance between throughput and fairness at low complexity under conditions of imperfect CSIT.read more
Citations
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Journal ArticleDOI
Energy-efficient resource allocation for OFDMA relay systems with imperfect CSIT
TL;DR: An energy-efficient resource allocation scheme for the downlink of decode-and-forward relay-assisted orthogonal frequency division multiple access systems and considers a proportional fairness design for the EE maximization problem.
Journal ArticleDOI
A new cross-layer scheme that combines grey relational analysis with multiple attributes and knapsack algorithms for WiMAX uplink bandwidth allocation
TL;DR: A new uplink bandwidth allocation scheme, GRAMA, which combines grey relational analysis with multiple attributes and the knapsack algorithms is proposed to improve resource utilization while satisfying the user’s requirements of throughput and fairness.
Journal ArticleDOI
QoS-aware scheduling algorithms to enhance user satisfaction in OFDMA systems: QoS-Aware Scheduling Algorithms to Enhance User Satisfaction in OFDMA Systems
Francisco Hugo Costa Neto,Emanuel B. Rodrigues,Diego Aguiar Sousa,Tarcisio F. Maciel,Francisco R. P. Cavalcanti +4 more
Journal ArticleDOI
A PDF/PMF Function Based Frequency Allocation Scheme in Fractional Frequency Reuse Aided OFDMA Networks
TL;DR: A novel frequency allocation scheme based on probability density/mass function functions (PDF/PMF) of random variables is proposed, which is capable of adjusting the balance between long term fairness and performance in fractional frequency reuse aided orthogonal frequency division multiple access based networks.
Proceedings ArticleDOI
A Dynamic Allocation Scheme for Resource Blocks Using ARQ Status Reports in LTE Networks
TL;DR: Simulation results show that DRBA can perform much better than the traditional automatic modulation and coding (AMC) scheme when a UE is in high interference/noise environment, and can achieve higher utilization, lower blocking rate, and admit more successfully connected UE.
References
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Journal ArticleDOI
Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints
TL;DR: A set of proportional fairness constraints is imposed to assure that each user can achieve a required data rate, as in a system with quality of service guarantees, and a low-complexity suboptimal algorithm that separates subchannel allocation and power allocation is proposed.
Journal ArticleDOI
Optimal resource allocation in the OFDMA downlink with imperfect channel knowledge
I.C. Wong,Brian L. Evans +1 more
TL;DR: This paper develops optimal resource allocation algorithms for the OFDMA downlink assuming the availability of only partial (imperfect) CSI, and considers both continuous and discrete ergodic weighted sum rate maximization subject to total power constraints, and average bit error rate constraints for the discrete rate case.
Proceedings ArticleDOI
Downlink OFDMA Resource Allocation Under Partial Channel State Information
TL;DR: By exploiting the statistical description of the imperfect CSI, various algorithms are proposed that tradeoff complexity versus performance, aiming at maximizing the system's successfully transmitted rate.
Proceedings ArticleDOI
Constrained Resource Allocation in OFDMA Downlink Systems with partial CSIT
TL;DR: This paper considers practical subchannel assignment and power allocation strategies for downlink multiuser OFDMA systems, where the base station has imperfect CSI, and uses the Lagrange dual decomposition framework to derive an algorithm that efficiently finds the optimal allocation.
Journal ArticleDOI
Fair Semi-distributed Resource Allocation Scheme over Relay-Enhanced OFDMA Networks
TL;DR: The proposed semi-distributed resource allocation scheme over relay-enhanced orthogonal frequency-division multiple access (OFDMA) cellular networks is effective to guarantee fairness among MSs while it achieves the higher average throughput than the existing opportunistic schemes.