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Multipath propagation and its influence on digital mobile communication systems

机译：多径传播及其对数字移动通信系统的影响

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The theory behind the mobile radio pro-pagation channel has been presented. The radio channel as a function of time and position has been explained in some detail. Then different principles of wideband radio channel measurements, channel soundings, have been introduced. An overview of Telenor R&D's channel sounders for use in the UHF- and U-bands have been given, together with the parameters used to describe the multipath situation. Parallel multipath and GSM measurements conducted by Telenor R&D show that the Q_(16)-parameter, derived from multipath measurements, gives a correct estimate of the GSM signal quality in more than 90 % of the cases. Parallel multipath and DECT measurements show that the delay spread parameter is an appropriate link quality estimator for a DECT implementation not employing channel equalisation. Lastly, measurements performed at 900 and 1700 MHz in different macrocellular environments in Norway have been presented, together with measurements from microcellular environments at 1950 MHz and 59 GHz. We have demonstrated that due to multi-path propagation, there is no guarantee that a base station site suitable for an analogue radio communication system is a good choice for a digital system. Even radio systems with very advanced air interfaces, like GSM and DCS 1800, may experience problems due to multipath propagation if the base station sites are not chosen properly.
机译：提出了移动无线电传播信道背后的理论。已经详细解释了作为时间和位置的函数的无线电信道。然后，介绍了宽带无线电信道测量的不同原理，信道探测。概述了Telenor R＆D在UHF和U波段中使用的信道探测仪，以及用于描述多径情况的参数。 Telenor R＆D进行的并行多径和GSM测量表明，在多于90％的情况下，从多径测量得出的Q_（16）参数可以正确估计GSM信号质量。并行多径和DECT测量表明，对于不采用信道均衡的DECT实现，延迟扩展参数是合适的链路质量估计器。最后，介绍了在挪威不同的宏蜂窝环境中以900和1700 MHz进行的测量，以及1950 MHz和59 GHz的微蜂窝环境中的测量。我们已经证明，由于多径传播，不能保证适用于模拟无线电通信系统的基站是数字系统的理想选择。如果未正确选择基站站点，则即使具有非常先进的空中接口的无线电系统（如GSM和DCS 1800）也可能会由于多径传播而出现问题。

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