Performance degradation of analog FM system due to spread spectrum overlay

Author

Vouyioukas, Demosthenes D. ; Constantinou, Philip

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Greece

Volume

49

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

113

Lastpage

123

Abstract

The investigation of spectrum overlay of a spread spectrum system on the existing narrowband FM broadcasting system is presented. The overlaid spread spectrum (SS) system is assumed to utilize direct sequence (DS) spreading, using maximal length pseudorandom sequences. We studied the performance degradation of the analog FM system due to the interference produced by the SS signal, through laboratory subjective and objective measurements, for various types of spreading scenarios and for different carrier frequency differences (Δf). The RF protection ratios for the FM receivers are derived, along with SINAD measurements. Finally, these experimental results have been compared with the theoretical study of the FM receiver´s audio frequency SNR output due to SS interference.

Keywords

frequency modulation; radio broadcasting; radio receivers; radiofrequency interference; random sequences; spread spectrum communication; DS spreading; FM receivers; RF protection ratios; SINAD measurements; analog FM system; audio frequency SNR; carrier frequency differences; direct sequence spreading; interference; maximal length pseudorandom sequences; narrowband FM broadcasting system; objective measurements; performance degradation; spread spectrum overlay; subjective measurements; Broadcasting; Degradation; Frequency measurement; Interference; Laboratories; Narrowband; Protection; Radio frequency; Random sequences; Spread spectrum communication;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/TBC.2003.810073

Filename

1208426