Multiple antenna transmitter diversity by using adaptive carrier selection for OFDM DS-CDMA in a variable selective fading channel

We propose a new transmitter diversity. It is a combined system with path diversity gain by distributed antennas and frequency diversity gain by multicarriers. The proposed system transmits the different data using several subcarriers which are correlated, while it transmits the same data using several subcarriers which are decorrelated. It can achieve combined path and frequency diversity in a variable frequency selective fading channel. It provides high data rate services by transmitting the different data using each correlated carrier, and supports good quality by transmitting the same data on decorrelated carriers with multiple antennas. The proposed system is an effective system to achieve a multimedia service with high quality according to the channel condition. Therefore, the proposed systems are flexible enough to support a variety of video, image, voice and data services with high quality