LAUSR

In this correspondence, we investigate the transmit signal design for millimeter-wave (mmWave) communication systems with distributed antennas. To be specific, by taking advantage of the directional communication property of mmWave communication, we first propose a generalized space domain index modulation (GSDIM) scheme to improve the system reliability. In the proposed GSDIM scheme, the user equipment (UE) uses different beam direction combinations to carry additional information bits, i.e., using multi-domain modulations to optimize transmission. Then, we derive the symbol error rate (SER) of the proposed GSDIM, and design digital precoding matrices to minimize the SER. It is shown that the SER minimization problem is a non-convex problem, and we propose an iterative method to solve it. Numerical results show that the proposed GSDIM scheme can achieve a lower system SER as compared with the existing counterpart.