V-BLAST technique for uplink MC-CDMA systems in rich scattering environment
R. Kanchanawat, Suwich Kunaruttanapruk, P. Khunabut, P. Tansongcharoen, SOMCHAI JITAPUNKUL · 2004
In this paper, we propose a new approach for MC-CDMA system in rich scattering environment. For our proposed system, an efficient MIMO technique, called as V-BLAST (vertical Bell Laboratories layered space-time), is applied in order to increase the capacity of uplink multi-carrier code division multiple access (MC-CDMA) system. High speed transmission can also be achieved by using a low spreading factor. In this system, different users can use the same spreading code, so system capacity can be increased significantly. Different from most of the V-BLAST related researches which assume the perfect knowledge of the channel, we also consider the effect of the practical channel estimation to the system performance. In this paper, we investigate the performance of this system in both rich scattering channel and low scattering channel. We show that this system can be used efficiently in rich scattering environment. In low scattering environment, the performance of this system is too close with original MC-CDMA system. In addition, the result of the simulation with the estimation error shows that this system is suitable for practical implementation.