John R. Juroshek

Abstract: The report examines the conditions under which spread–spectrum, land–mobile radio, and television can share spectrum. After a preliminary assessment, the report concludes that the interference caused by a constant amplitude, spread–spectrum system should be comparable to that caused by a conventional, narrowband, FM, land mobile signal of same total power, provided the spread–spectrum signal has an rf bandwidth less than 2 MHz. With spectrum spreads greater than 6 MHz, the spread–spectrum system should have some acivantage because of the out–of–band rejection capabilities of a TV receiver. A limited number of laboratory measurements are also described that support the conclusions of the report.

Keywords: interference; spread spectrum; television; land mobile radio (LMR)

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

Back to Search Results