From Maxwell's Equations to Cognitive Radio
From Maxwell's Equations to Cognitive Radio
复制标题
从麦克斯韦方程组到认知无线电
DOI：
10.1109/crowncom.2008.4562458
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
F. Jondral
中科院分区：
文献类型：
--
作者：
F. Jondral
麦克斯韦的方程组是在1865年左右出版造成海因里希赫兹证明存在的电磁波。他在1887/88年成功了。大约在1900年，马可尼建立了第一个长距离无线电通信连接。在接下来的50年里，模拟无线电通信达到了完美。香农在1949年发表了采样定理，这是无线电发展的一个重大变化。与晶体管和集成电路的发明一起，这导致了数字信号处理的建立，并由此产生了数字蜂窝移动的无线电的压倒性成功。对最佳地适应不同应用（个人、办公室、家庭、汽车、城市、农村环境）的无线电系统的需求以及经济上的必要性导致了各种标准（DECT、GSM、UMTS、IEEE 802.11x、蓝牙、ZigBee等）的定义，一个需要特别提款权的发展。无线电发展的下一步将是创造有助于最有效地利用无线电频谱的设备。在这种情况下，无线电必须知道他们的位置，并监督他们的电磁环境，以便能够最佳地适应他们的传输方法。这篇文章试图追溯无线电的发展，从它的起源到认知无线电，并对未来的发展进行分类。
Maxwell's equations that were published around 1865 caused Heinrich Hertz to prove the existence of electromagnetic waves. He succeeded in 1887/88. Around 1900, Marconi established the first long distance radio communication connections. During the following five decades, analog radio communication was brought to perfection. A big change in radio development was launched by Shannon with the publication of the sampling theorem in 1949. Together with the invention of the transistor and integrated circuits this led to the establishment of digital signal processing and, emerging from this, to the overwhelming success of digital cellular mobile radio. The demand for radio systems optimally adapted to different applications (personal, office, home, car, urban, rural environments) together with economic necessities resulted in the definition of a variety of standards (DECT, GSM, UMTS, IEEE 802.11x, Bluetooth, ZigBee, ...), a development that called for SDRs. The next step in radio evolution will create devices that will help to make highest efficient use of the radio spectrum. In this scenario radios have to be aware of their location and to supervise their electromagnetic environment in order to be able to optimally adapt their transmission methods. This contribution tries to trace radio development from its origins to cognitive radio as well as to classify future developments.