Digital wireless sensor server using an adaptive smart-antenna/retrodirective array
Digital wireless sensor server using an adaptive smart-antenna/retrodirective array
复制标题
DOI：
10.1109/tvt.2003.816610
复制
发表时间：
2003-09
期刊：
影响因子：
--
通讯作者：
R. Miyamoto;K. Leong;Seong-Sik Jeon;Y. Wang;Y. Qian;T. Itoh
中科院分区：
文献类型：
--
作者：
R. Miyamoto;K. Leong;Seong-Sik Jeon;Y. Wang;Y. Qian;T. Itoh
设计了一种基于可重构有源智能天线/反向阵列的无线传感器服务器。该系统可以作为一个反向阵列转发器和智能天线接收器，只需通过改变本机振荡器的频率应用到混频器，使其能够利用其硬件最好地适应其通信环境。当作为直接转换接收机工作时，接收机阵列成功地以7 dB的电路增益对四相相移键控（QPSK）调制信号进行解调，并且对于BER=10/sup-4/，E/sub B//N/sub 0/约为12 dB，而没有任何纠错。在后向阵列模式下，系统在中心频率处提供20 dB的电路增益和20 dB的射频/中频隔离度，并具有相位共轭特性，表现出良好的后向性。混频器同时执行相位共轭和调制，从而能够传输本地存储的数据。本地数据被成功地提取由一个代理。
A wireless sensor server is developed based on a reconfigurable active smart-antenna/retrodirective array. The system can serve as both a retrodirective array transponder and a smart-antenna receiver simply by changing the frequency of the local oscillator applied to the mixers, enabling it to utilize its hardware best to suit its communication environment. When operating as a direct-conversion receiver, the receiver array successfully demodulates a quaternary phase-shift keying (QPSK) modulated signal with circuit gain of 7 dB, and E/sub b//N/sub 0/ for BER=10/sup -4/ is approximately 12 dB without any error correction. In the retrodirective array mode, the system provides 20 dB circuit gain and 20 dB radio-frequency/intermediate-frequency isolation at the center frequency as well as phase conjugation, exhibiting excellent retrodirectivity. The mixers perform phase conjugation and modulation simultaneously, enabling the transmission of locally stored data. The local data is successfully extracted by an interrogator.