A New Beamforming Method for Single Carrier Modulation System with Cyclic Prefix

This paper proposes a new weight control method for a pre-FFT type adaptive antenna array applied to a single carrier modulation system with cyclic prefix. The weight control method is based on the maximization of the signal-tointerference-plus-noise power ratio (SINR) at the discrete frequency domain equalizer output, therefore, the proposed scheme can increase the received signal power by capturing multiple delayed signals within the guard interval (GI), while avoiding the noise enhancement at the equalizer. Moreover, it can suppress the delayed signals beyond the GI, which is the cause of both the intersymbol interference (ISI) and the interblock interference (IBI). The performance of the proposed method is evaluated via computer simulations, comparing with the performance of weight control methods for the OFDM array and the conventional weight control method.