Keysight - Techniques for Precise Interference Measurements in the Field

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This application note discusses the different kinds of interference that operators will encounter in both current and new wireless environments. It introduces efficient and effective measurement techniques and instrument requirements for testing interference using modern highperformance spectrum analyzers such as Agilent FieldFox analyzers, which have the versatility and durability to make accurate measurements quickly in the field in harsh conditions and hard-to-reach locations. The classifications for different types of interference including in-band, co-channel, out-of-band and adjacent channel interference will also be discussed.


Introduction

Operators of microwave systems frequently encounter interference from cellular systems and data links. Due to the scarcity of radio frequency spectrum, demands are often placed on wireless communication systems to operate under a limited amount of radio interference. Many existing wireless systems control and operate portions of the frequency spectrum through licensing with regulatory agencies. Licensed operation grants the service provider the right to determine the technology employed for the service offered and is also protected against harmful interference from other wireless services and service providers. Licensed wireless systems operate over a wide range of RF and microwave carrier frequencies. Licensed systems include LTE cellular, which operates with carrier frequencies typically below 2 GHz, direct broadcast satellite operating at 12 GHz for the downlink and 17 GHz for the uplink, and point-topoint backhaul systems operating in the 23 GHz band. When attempting to squeeze a large number of users on to a limited band of licensed spectrum, co-channel and adjacent channel interference are often created within the system...



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