Blind Time Domain Equalization of SCFDMA Signal

In this paper a new equalizer for Single Carrier FDMA (SCFDMA) is described. This signal is currently proposed for mobile radio uplink communications in 3G Long Term Evolution (3G LTE). In this system, equalization is performed thanks to the addition of a Cyclic Prefix (CP), as in OFDM system, and pilots regularly inserted for channel estimation which leads to the usefull throughput degradation. To reduce this degradation a new structure of blind time domain equalizer, shared in two parts, is proposed in this paper : The filtering itself which is a linear time domain filtering performed before any demodulation device in the receiver side, and the MMSE criterion algorithm performed in the time domain after user selection and demodulation. The results are very convincing both in terms of Mean Square Error and in throughput gain compared to the performances of Zero-Forcing technique(ZF) used in literature.