A frequency scheduling method using antenna diversity for MC-CDM system

Multi-carrier code division multiplexing (MC-CDM) is one of the promising multiplexing techniques for fourth-generation mobile downlink communications systems, where high data rate services should be provided even for high speed-cruising mobiles. For MC-CDM-based packet communication, a frequency scheduling method, which adaptively assigns different blocks of sub-carriers to different users, is proposed. This paper proposes a channel allocation method, which utilizes spatial channel impulse response information in the frequency domain for MC-CDM downlink system. Furthermore, the performance of the proposed system in a frequency selective fading channel is compared with that of the conventional system by computer simulation. From the results, It is found that the proposed system achieves better packet error rate performance than the conventional system in a lower average E_b/N₀ per antenna region and can control QoS (quality of service) for active users.