Wireless communications and digital transmission

蜂窝电话、移动卫星和便携式个人通信服务的出现极大地推动了无线通信的研究。用户对服务的需求呈指数级增长，对更高速度传输大量数据的需求不断增加，以及客户对多媒体服务的需求不断增加，这就产生了对新技术的需求。为了在不牺牲所接收信息的完整性的情况下向更多用户提供更高的数据传输速率，必须在传输系统设计和传输系统组件中取得进展。反过来，要在无线系统和组件中实现最好的进步，需要在实际系统中更好地估计无线信道，并在工程设计研究中更好地对无线信道进行建模。

Wireless communications research has been given great impetus by the advent of cellular telephony, mobile satellite and portable personal communication services. The exponentially growing user demand for services, together with the increasing demands for higher speed transmission of large amounts of data, as well as customer requests for multi-media services, create the need for new technologies. In order to provide higher data transmission rates to more users without sacrificing the integrity of the received information, advances must be made in the transmission system designs and in the transmission system components. In turn, achieving the best advances in wireless systems and components requires better estimation of the wireless channels in practical systems, and better modelling of the wireless channels in engineering design studies.