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Adaptive Resource Allocation with Proportional Rate Constraints for OFDMA Based Next Generation Networks

Author(s): Rohit Sharma | Manoranjan Rai Bharti

Journal: International Journal of Computer Applications
ISSN 0975-8887

Volume: comnetcn;
Issue: 1;
Date: 2012;
Original page

Keywords: OFDM | Adaptive Resource Allocation | sum capacity

The primary objective of the Next Generation Networks, which are based on Multiuser Orthogonal frequency division multiplexing (MU-OFDM) is to increase the network efficiency by maximizing the total throughput of the system and minimizing the overall transmit power for a give quality of service (QOS). MU-OFDM is one of the promising techniques for achieving high downlink capacities in future cellular and wireless networks. The sum capacity of MU-OFDM is maximized when each subchannel is assigned to the user with the best channel-to-noise ratio for that subchannel, with power subsequently distributed. Ever increasing demand for high throughput, low delay and low Outage probability can be met by using Adaptive Resource Allocation in OFDM Technology. Optimal solution to the constrained fairness problem of Adaptive Resource Allocation is extremely computationally complex to obtain, a low-complexity suboptimal algorithm that separates subchannel allocation and power allocation is proposed. In the proposed algorithm, subchannel allocation is first performed by assuming an equal power distribution. Power allocation is done later to maximizes the sum capacity.
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