Direct Antenna Modulation for High-Order Phase Shift Keying
Direct Antenna Modulation for High-Order Phase Shift Keying
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DOI：
10.1109/tap.2019.2935136
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发表时间：
2020-01-01
影响因子：
5.7
通讯作者：
O'Farrell, Timothy
中科院分区：
文献类型：
--
作者：
Henthorn, Stephen;Ford, Kenneth Lee;O'Farrell, Timothy
本文讨论、设计并测量了一种能够直接对射频 (RF) 载波进行相位调制的天线，同时作为天线和调制器。物联网接入点致密化的成本高昂，部分原因是下行链路传输的峰均功率比放大波形成本高昂且效率低下。在天线处直接调制意味着只需放大载波，从而降低了致密化成本。这里，建议使用可重构频率选择表面作为相位调制器。详细介绍了相位调制天线的设计过程，并制作了能够进行高达 8-PSK 调制、星座点变化为 5.3 dB、峰值增益为 2.3 dB 的原型。当在端到端通信系统中实施时，与加性高斯白噪声 (AWGN) 信道中的仪器级调制相比，该天线的性能仅下降 1.5 dB。
An antenna capable of directly phase modulating a radio frequency (RF) carrier is discussed, designed, and measured as both an antenna and a modulator. Access point densification for the Internet of Things will be expensive in part due to the cost and inefficiency of amplifying waveforms with large peak-to-average power ratios for downlink transmission. Directly modulating at the antenna means only a carrier wave has to be amplified, reducing the cost of densification. Here, reconfigurable frequency selective surfaces are suggested as phase modulators. The design process for producing a phase modulating antenna is detailed, and a prototype is fabricated that is capable of up to 8-PSK modulation with 5.3 dB variation in constellation points and a peak gain of 2.3 dB. When implemented in an end-to-end communications system, the antenna exhibits only 1.5 dB drop in performance compared with instrument grade modulation in an additive white Gaussian noise (AWGN) channel.