METHOD FOR REDUCING THE RISK OF POOR RECEPTION IN A MOBILE TELEPHONY SYSTEM

摘要

A method of reducing in a digital time multiplex mobile telephonysystem the risk of poor reception as a result of the occurrence ofpoints of low signal strength, so-called zero points. Transmissionfrom fixed stations is effected with a polarization directionwhich is changed stepwise between different parts of thetransmitted information. This causes the fading patterns aroundreceiving stations to change in time, and also causes any zeropoints to be moved in the geography, therewith making it improbablethat more than a small part of an information frame will belost. In the case of a GSM-type system, the polarization directionis changed for each. new TDMA-frame.