Channel-Oriented Channel Allocation Scheme (COCAS) for Multi-Antenna OFDMA Femtocells

In this paper, we propose a low-complexity distributed channel-oriented channel allocation scheme (COCAS) to improve the link reliability of users and the spectrum efficiency of femtocells for multi-antenna orthogonal frequency-division multiple access (OFDMA)-based femtocell systems. By two steps of comparisons on channel gains of resource blocks and antennas, the COCAS can jointly allocate suitable antennas and resource blocks for transmission. We also investigate the impacts of channel allocation and multiple antennas on link reliability of users and spectrum efficiency of femtocells. Simulation results show that the proposed COCAS can achieve higher spectrum efficiency for femtocells than the random channel allocation scheme with a given number of antennas equipped on the femtocell base station, under the link reliability requirement.