Beam Angle Channel Modulation

摘要

This paper introduces a novel transmission technique named Beam Angle Channel Modulation (BACM) that uses an antenna array to encode the information symbols into the angle of propagation (and arrival) wave in the wireless channel. At the encoder, the block of information bits is mapped into two symbols: (i) a spatial symbol selecting the direction of arrival of the amplitude and phase modulated carrier signal and (ii) a temporal symbol chosen from the constellation diagram like QAM or PSK. The proposed scheme follows the model for concatenated modulation designs like recently introduced spatial modulation (SM). The use of the transmitted signal angle through antenna array beamforming increases the spectral efficiency of the single-input single-output (SISO) conventional (temporal) modulation by the base-two logarithm of the number of spatial beams that can be resolved (detected) at the receiver. Direction-of-arrival type detection for spatial symbols is developed using a linear array of receive antennas. It is demonstrated that the detection reliability of the spatial symbols in BACM is determined by the number of antennas used at the receiver and the actual angles of signal arrival.