Interference to digital broadband communications and spread spectrum communications

Author

Rhodes, Charles W.

Author_Institution

Consulting Engineer, Vancouver, WA, USA

fYear

2012

fDate

13-16 Jan. 2012

Firstpage

283

Lastpage

284

Abstract

Wireless transmission systems were initially noise limited and as they matured became interference limited. Now wireless systems are in transition from analog to digital. There are various classes of digital wireless systems: Those which require the signal-to-noise ratio (SNR) to be above a positive SNR threshold, for example 3G and 4G (LTE) and Digital TV Systems. The other systems employ spread spectrum technology, using Direct Digital Synthesis (DDS) which operate with negative SNR, for example the Global Positioning System (USA), and similar systems: Galileo (Europe), Glonass (Russia), and Compass in China. Interference between 3G or 4G (LTE) digital signals to DDS based signals and interference from DTV signals to 3G or 4G signals is the subject of this paper. The measurement techniques that proved useful for analog transmission systems such as two-tone testing are not suitable for testing of broadband systems and their active components. These inadequacies will be discussed and alternatives proposed.

Keywords

3G mobile communication; 4G mobile communication; Global Positioning System; Long Term Evolution; broadband networks; direct digital synthesis; radiofrequency interference; spread spectrum communication; 3G digital signal system; 4G digital signal system; DDS based signals; DTV signal; LTE; analog to digital transition; analog transmission system; broadband system testing; digital TV system; digital broadband communication; digital wireless system; direct digital synthesis; global positioning system; measurement technique; positive SNR threshold; signal-to-noise ratio; spread spectrum communication; two-tone testing; wireless transmission system; Broadband communication; Digital TV; Global Positioning System; Interference; Receivers; Testing; 3G; 4G; DTV; GPS; LTE;

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics (ICCE), 2012 IEEE International Conference on

Conference_Location

Las Vegas, NV

ISSN

2158-3994

Print_ISBN

978-1-4577-0230-3

Type

conf

DOI

10.1109/ICCE.2012.6161869

Filename

6161869