MIMO technology can utilize spatial multiplexing in link level or use multiuser scheduling in system level to increase system capacity. However it is not enough only to optimize the performance of link level or only to schedule the multiuser in system level respectively. Combining both to optimize can obtain higher system capacity. A novel Cross Optimization Scheduling Algorithm (COSA) is proposed, which combines the scheduling strategy in system level with the physical optimization in link level and water-filling algorithm is used to adjust power allocation of each antenna. Simulation results show that COSA algorithm not only provides the fair channel access chance to users in system level but utilizes spatial multiplexing of MIMO system and allocates power in link level to increase system capacity.
Tarokh V, Seshadri N, and Calderbank A R. Space-timecodes for high data rate wireless communication:performance criterion and code construction[J].IEEE Trans. onInformation Theory.1998, 44(2):744-765[2]Foschini G J and Gans M J. On limits of wirelesscommunications in a fading environment when using multipleantennas. Wireless Personal Commun, 1998, 6(3): 315-335.[3]Heath Jr R W, Sandhu S, and Paulraj A J. Antenna selectionfor spatial multiplexing systems with linear receivers. IEEECommunications Letters, 2001, 5(4): 142-144.[4]Lucent Technologies. Throughput simulations for MIMO andtransmit diversity enhancements to HSDPA. 3GPP TSGRAN WG1, TSGR#17, Nov. 2000.[5]Heath Jr R W, Airy M, and Paulraj A J. Multiuser diversityfor MIMO wireless systems with linear receivers. in Proc.IEEE Asilomar Conference on Signals, Systems andComputers, Pacific Grove, USA, 2001: 1194-1199.[6]Choi Y J, Kim J, and Bahk S. Downlink scheduling withfairness and optimal antenna assignment for MIMO cellularsystems. IEEE Communications Society, Globecom DallasTexas, USA, 2004: 3165-3169.[7]Shin O S and Lee K B. Antenna-assisted Round Robinscheduling for MIMO cellular systems. IEEE CommunicationLetters, 2003, 7(3): 109-111.[8]ETSI Technical Report 101 112. Selection procedure for thechoice of radio transmission technologies of the UMTS.UMTS TR 30.03, V3.2.0, 1998.