Directional Modulation Based on 4-D Antenna Arrays
作者： Quanjiang Zhu , Shiwen Yang , Ruilin Yao , Zaiping Nie
关键词: Analog transmission 、 Quadrature amplitude modulation 、 Frequency modulation 、 Modulation 、 Electrical engineering 、 Delta modulation 、 Pulse-amplitude modulation 、 Bandwidth (signal processing) 、 Transmission (telecommunications) 、 Bit error rate 、 Wireless 、 Delta-sigma modulation 、 Directivity 、 Phase-shift keying 、 Acoustics 、 Computer science 、 Electrical and Electronic Engineering
摘要: Four-dimensional (4-D) antenna arrays are formed by introducing a fourth dimension, time, into traditional arrays. In this paper, time-modulated 4-D array with constant instantaneous directivity is proposed for directional modulation. The main idea that the transmits correct signal without time modulation in desired direction, while transmitting signals other directions. As longs as frequency less than bandwidth of transmitted signal, cannot be demodulated correctly due to aliasing effect, implying go distorted. Thus, can used transmit direction-dependent secure wireless communications. verified experiments based on AM transmission through array. Moreover, BPSK studied and bit error rate (BER) performance investigated. Simulation results show BERs (TM-BPSK) sidelobes much higher those almost keep unchanged even under SNR. Finally, two enhanced methods presented improve feasibility using random sequences frequency.
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