Fair subcarrier-power allocation scheme for multiuser multicarrier systems

Abstract

The main objective of multiuser orthogonal frequency division multiple access (MU-OFDM) is to maximize the total system capacity in wireless communication systems. Thus, the problem in MU-OFDM system is the adaptive allocation of the resources (subcarriers, bits and power) to different users subject to several restrictions to maximize the total system capacity. In this work, a proposed subcarrier allocation algorithm was presented to assign the subcarriers with highest channel gain to the users. After the subcarrier allocation, subcarrier gain-based power allocation (SGPA) was employed for power and bit loading. The simulation results show that the proposed subcarrier-power allocation scheme can achieve high total system capacity and good fairness in allocating the resources to the users with slightly high computational complexity compared to the existing subcarrier allocation algorithms.

Keywords

multiuser orthogonal frequency division multiple access (MU-OFDM) / subcarrier-allocation / power allocation / fairness / capacity

References

[1] ZhaoW-t, WangS-wei. Subcarrier and power allocation in multiuser OFDM systems with fixed rate constraints [J]. Journal of Information & Computational Science, 2011, 8(11): 2017-2024

[2] ThumarV, NadkarT, GopavajhulaT, DesaiU B, MerchantS N. Power allocation, bit loading and sub-carrier bandwidth sizing for OFDM-based cognitive radio [J]. EURASIP Journal on Wireless Communications and Networking, 2011, 87: 1-24

[3] LandeS B, dr HELONDEJ B, dr PANDER. Comparison of resource allocation techniques in OFDMA for wireless communication [J]. International Journal of Engineering and Innovative Technology (IJEIT), 2012, 2(6): 430-435

[4] AhmedI, SadequeS, PervinS. Margin adaptive resource allocation for multi–user OFDM systems by particle swarm optimization and differential evolution [J]. International Journal of Engineering & Technology, 2011, 11(1): 58-62

[5] MorettiM, Perez-NeiraA I. Efficient margin adaptive scheduling for MIMO-OFDMA systems [J]. IEEE Transactions on Wireless Communications, 2012, 12(1): 1-10

[6] DurgamR, KumarP A, BabuK D. Margin Adaptive power allocation using channel state information in OFDMA systems [J]. International Journal of Engineering Science & Advanced Technology, 2013, 3(5): 205-209

[7] ChenY F, ChenJ W. A fast subcarrier, bit, and power allocation algorithm for multiuser OFDM-based systems [J]. IEEE Trans Veh Technol, 2008, 57(2): 873-881

[8] LandeS B, HelondeJ B, PandeR, PathakS S. Adaptive subcarrier and bit allocation for downlink OFDMA system with proportional fairness [J]. International Journal of Wireless & Mobile Networks, 2011, 3(5): 125-140

[9] ArchanaC, RejithK N. Rate adaptive resource allocation in OFDMA using BEES algorithm [J]. International Journal of Research in Engineering and Technology, 2014, 3(15): 14-18

[10] RheeW, CioffiJ MIncrease in capacity of multiuser OFDM system using dynamic subchannel allocation [C], 20001085-1089

[11] OtaniY, OhnoS, TeoK D, HinamotoTSubcarrier allocation for multi-user OFDM system [C], 20051073-1077

[12] WongI, ShenZ, EvansB, AndrewsJA low complexity algorithm for proportional resource allocation in OFDMA systems [C], 2004USAIEEE1-6

[13] KimY, KimJAn efficient subcarrier allocation scheme for capacity enhancement in multiuser OFDM systems [C], 2008SingaporeIEEE1915-1919

[14] FalahatiA, ArdestaniM R. Adaptive subcarrier assignment and power distribution in multiuser OFDM systems with proportional data rate requirement [J]. Iranian Journal of Electrical & Electronic Engineering, 2008, 4: 10-16

[15] VishalW, RakeshJ, DalalUResource allocation algorithm for WiMAX systems [C], 2011MalaysiaIEEE753-758

[16] OdhahN A, DessoukyM I, Ai-HanafyW, Abd Ei-SamieF E. Low complexity greedy power allocation algorithm for proportional resource allocation in multiuser OFDM systems [J]. Journal of Telecommunications & Information Technology, 2012, 4: 38

[17] NwamadiO, ZhuX, NandiADynamic subcarrier allocation for single carrier-FDMA systems [C], 2008SwitzerlandEURASIP1-6

[18] KimY, KimJ. A 2-D subcarrier allocation scheme for capacity enhancement in a clustered OFDM system [J]. IEICE Trans Commun, 2007, 7: 1880-1883

[19] ErmolovaN Y, MakarevitchBPerformance of practical subcarrier allocation schemes for OFDMA [C], 2007GreeceIEEE1-4

[20] LiuT, YangC, YangL. A-low complexity subcarrier-power allocation scheme for frequency-division multiple-access systems [J]. IEEE Transactions on Wireless Communications, 2010, 9(5): 1564-1570

[21] ZhangJ W, ChiJ X, XuX R. Worst subcarrier avoiding water-filling subcarrier allocation scheme for OFDM-based CRN [J]. Journal of Electronics (China), 2012, 29: 204-210

[22] ZhangS-b, HuJ-m, WangH-jian. Subcarriers and bits allocation in multiuser orthogonal frequency division multiplexing system [J]. Sensors & Transducers, 2014, 168(4): 210-215

[23] LeeK, KimK W. Efficient sub-carrier assignment scheme in OFDMA system with partial channel state information [J]. International Journal of Software Engineering and its Applications, 2014, 8(3): 269-278

[24] RasouliH, AnpalaganAAn asymptotically fair subcarrier allocation algorithm in OFDM systems [C], 20091-5