Low complexity QoS-aware subcarrier allocation for MISO-OFDMA systems

Abstract

A low complexity Quality-of-Service (QoS)-aware sub-carrier allocation/user-selection technique for the downlink of Multiple-Input Single-Output Orthogonal Frequency Division Multiple-Access (MISO-OFDMA) system is proposed. The algorithm allows simultaneous transmission to multiple users on the same sub-carrier through zero-forcing beamforming (ZFBF). The proposed algorithm enhances QoS by preserving minimum rate for each user while providing high bandwidth data services. Simulation results reveals that our algorithm outperforms other reference algorithms in terms of average sum-rate per sub-carrier and QoS, while lower complexity is attained by the proposed algorithm in terms of execution time needed compared to reference algorithms.

Chunk-based resource allocation in multi-cell OFDMA systems with fairness guarantee

“…Many algorithms have been previously proposed to solve resource allocation (RA) problem on a sub-channel basis [3,4]. However, RA on a sub-channel basis has two main drawbacks; higher complexity and large amount of channel information to be fed-back to the base-station (BS).…”

Fairness aware chunk-based resource allocation in multi-cell OFDMA networks

“…These sub-problems should be jointly and efficiently solved with reasonable complexity. Many algorithms in the literature have been proposed to solve RA problem on a a sub-channel basis [3], [4] either to maximize system throughput or minimize transmitted power. RA on a subchannel basis has two main drawbacks: (1) RA algorithm complexity highly grows as number of sub-channels increases and (2) large signalling is required to be fed-back about channel information of each sub-channel.…”