Sum-rate maximization in OFDMA downlink systems: A joint subchannels, power, and MCS allocation approach | IEEE Conference Publication | IEEE Xplore

Sum-rate maximization in OFDMA downlink systems: A joint subchannels, power, and MCS allocation approach


Abstract:

In this paper, by jointly considering subchannels, power, and Modulation and Coding Scheme (MCS) allocation, we address the sum-rate maximization problem in OFDMA downlin...Show More

Abstract:

In this paper, by jointly considering subchannels, power, and Modulation and Coding Scheme (MCS) allocation, we address the sum-rate maximization problem in OFDMA downlink systems. We formulate the problem as an integer linear programming (ILP), which maximizes the system sum-rate subject to the minimum rate requirements of users and total transmit power constraint of base station. To solve the formulation with low complexity, we propose a two-level iterative Subchannels, Power, and MCS allocation Algorithm (SPMA) by exploiting Tabu Search (TS). At each iteration, the SPMA firstly assigns MCS to users and then allocates subchannels and power based on a SubChannels and Power allocation Algorithm (SCPA). Particularly, the SCPA maximizes the system sum-rate by first satisfying the minimum rate requirements with the least transmit power. Simulation results show that the SPMA outperforms the existing algorithms in terms of sum-rate and average rate per user, as well as demonstrate that the sum-rate is distributed flexibly among users in instantaneous channel conditions with the SPMA.
Date of Conference: 02-05 September 2014
Date Added to IEEE Xplore: 29 June 2015
Electronic ISBN:978-1-4799-4912-0

ISSN Information:

Conference Location: Washington, DC, USA

References

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