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Digital Radio System Range Reduction Caused by Radiated Emission Limits
Swedish Defence Research Agency (FOI).
1998 (English)Conference paper (Refereed)
Abstract [en]

Co-location between digital radio systems and electronic equipment can lead to severe interference problems. Unintentional radiated electromagnetic emission can increase the Bit Error Probability (BEP) in the digital radio receiver, and thus reduce the range of secure operation. The required increase in Signal to Noise Ratio (SNR), to compensate for this increase in BEP, is calculated for different separation distances between the undesired interference source and the digital radio receiver. This required increasement in SNR is also related to the corresponding reduction in operating range for the communication link. The calculations are performed for colocated electronic equpiment whose interference levels equals three radiated standard limits; EN 55022 Class A and Class B, and a typical military limit; RE 102 from MIL-STD-461 D. The digital radio system is assumed to use the modulation scheme Minimum Shift Keying (MSK). The results for an operating frequency at 60 MHz and 900 MHz, and BEP requirements of and is compared. The conclusion is that RE 102 does not give any range reduction for separation distances greater than 10 m. The civilian radiated emission limits, however, give considerable range reductions at separation distances up to 40 - 50 meters and a required BEP of , depending on what operating frequency is used by the digital radio system. At 60 MHz, at 10 m separation distance to the interference source, the Class B limit reduces the range with a factor 3, for a BEP of . The impact at 900 MHz is less than at 60 MHz. For a BEP of , the civilian radiated limits gives considerable range reductions at separation distances up to 50 - 60 m. The results shows that the interference from civilian electronic equpiment, co-located to digital radio receivers, must be controlled to not affect the operating range of the radio system.

Place, publisher, year, edition, pages
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Computer and Information Science
Research subject
URN: urn:nbn:se:kth:diva-28146OAI: diva2:384013
Roma International Symposium on EMC
QC 20110114Available from: 2011-01-07 Created: 2011-01-07 Last updated: 2011-01-14Bibliographically approved

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