摘要
提出了一种采用数字微波移相系统实现相移键控(PSK)的技术,用现场可编程门阵列(FPGA)控制下的微波移相器对射频载波进行移相的方法实现PSK调制.新设计可以实现2,8,16,32,64进制的PSK调制.该技术应用于天线阵系统时能够采用同一个调相网络同时实现PSK调制和波束合成.采用新技术制作的无线发射系统的实测表明,该系统的移相误差小于1.2°,误码率低于10-5,达到了常见的正交调制PSK实现技术的误码水平.新设计不需要常见的正交调制PSK实现技术必需的正交调制器和混频器,简化了系统,降低了成本。
The new realization of PSK using a digital microwave phase system is presented. A microwave phase shifter controlled by FPGA is used to shift the phase of the radio carrier wave to finish PSK modulation. The new design can realize 2, 4, 8, 16, 32 or 64 PSK modulations. When the new design is used in an antenna array system, only one phase shifter is needed to finish both PSK modulation and beam-forming. Tests of the wireless transmitter that is fabricated according to the new design show that the phase shifting error is lower than 1.2°~ and the BER is lower than 10-5, which leads to .the BER level of the common PSK realization of orthogonal modulation. The new design does not need an orthogonal modulator and a mixer which are necessary in the common PSK realization of orthogonal modulation, thus simplifying the system and reducing its cost.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2012年第5期85-90,共6页
Journal of Xidian University
基金
国家自然科学基金资助项目(60871008)
