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Preventing interference

Posted: 03 Feb 2009     Print Version  Bookmark and Share

Keywords:radio system  wireless link  antenna 

Designing a radio system requires knowledge of some fundamental parameters to understand what will influence link performance and reliability. In Part 1, most fundamental parameters—output power and receiver sensitivity—have been discussed already. It also tackled the fundamentals of the wireless link and computing antenna size.

The others important parameters are receiver dynamic range, co-channel rejection, adjacent channel selectivity, reference frequency stability, mirror image attenuation and modulation principle. These are all important although not directly part of the transmission budget. These do have an affect on transmission reliability, especially when other transmitters are in close proximity. So, having established the transmission budget, the next question a designer should ask is: "How does my system behave when an unrelated transmitter radiates energy into the local environment?"

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