An adaptive antenna array for single carrier modulation system with cyclic prefix

In a single carrier modulation system with cyclic prefix (SC-CP), equalization is possible for the case where the delayed signals lie within the guard interval (GI). The reception of all the delayed signals within the GI can increase the received signal power, and hence may improve the system performance. However, it also increases the probability that the channel transfer function has a zero (or zeros) on the FFT grid, which results in serious noise enhancement (NE). Therefore, some appropriate reception methods, which can receive multiple delayed signals within the GI while avoiding the NE, are required. In this paper, in order to achieve such a reception, an adaptive antenna array is applied to the SC-CP system, and the optimum weights control method is proposed. Moreover, to verify the performance of the proposed method, some weights control methods, originally proposed for the orthogonal frequency division multiplexing (OFDM) adaptive array, are applied to the SC-CP adaptive antenna array, and their performances are studied and compared with the proposed system via simulations.