Resource allocation scheme with proportional fairness for multi-user downlink MIMO-OFDMA-CDM systems

Abstract

In this paper, we propose a new resource allocation scheme that enhances a diversity effect with taking into account a proportional fairness (PF) in downlink MIMO-OFDMA-CDM (multiple input multiple output -orthogonal frequency division multiple access -code division multiplexing) systems. In the proposed scheme, spectral resources are allocated per subcarrier unit and full code-spreading is done for each user using all allocated subcarriers. This maximizes a frequency diversity effect and also enhances a multi-user diversity effect. Furthermore, the subcarrier allocation is based on the PF scheme which is not consider in conventional OFDMA-CDM schemes. The improvement performances of BER and capacity are shown through computer simulations.

Adaptive communication using softcomputing techniques

“…SA also uses the same fitness function shown in fig-5 and described in Equ. (8). In order to find the optimum power vector, the basic flat power vector (initial guess) is passed through the OFDM system.…”

“…Also it was shown that GA is better than conventional methods. A scheme for resource allocation in downlink MIMO-OFDMA with proportional fairness where dominant Eigen channels obtained from MIMO state matrix are used to formulate the scheme with low complexity in [8], scheme provides much better capacity gain than static allocation method. A PSO based Adaptive multicarrier cooperative communication technique which utilizes the subcarrier in deep fade using a relay node in order to improve the bandwidth efficiency [9] where centralized and distributed versions of PSO were investigated.…”

Dynamic resource allocation in OFDM systems using DE and FRBS

“…A scheme for resource allocation in downlink Multiple Input Multiple Output (MIMO) OFDMA with proportional fairness where dominant Eigen channels obtained from MIMO state matrix are used to formulate the scheme with low complexity in [22], scheme provides much better capacity gain than static allocation method. A PSO based Adaptive multicarrier cooperative communication technique which utilizes the subcarrier in deep fade using a relay node in order to improve the bandwidth efficiency [23] where centralized and distributed versions of PSO were investigated.…”