Title :
An improved technique for calculating outage time due to multipath fading effect
Author :
Chao, C.L. ; Lui, G.L.
Author_Institution :
TRW Space & Defense Sector, Redondo Beach, CA, USA
Abstract :
The authors present a unified analytical method for calculating the outage time of a digital radio relay system due to the multipath interference effect over line-of-sight paths. A computer program is used to simulate a two-path multipath transmission channel and the pulse-shaping networks in the modem. These simulations are used to obtain channel outage time caused by both multipath channel characteristics and design imperfections in the actual modem filters. Two illustrative examples are numerically performed on the DRAMA (Digital Radio and Multiplex Acquisition) system, which features both QPSK and QPR modulation schemes at carrier frequencies of 4 and 8 GHz. It is noted that this method of calculation can be easily extended to any multipath scenario consisting of three or more paths.<>
Keywords :
digital radio systems; digital simulation; fading; modulation; radiofrequency interference; 4 GHz; 8 GHz; DRAMA; QPR; QPSK; computer program; digital radio relay system; digital simulation; interference; modem; multipath fading; outage time; pulse-shaping networks; two-path multipath transmission channel; unified analytical method; Computational modeling; Computer networks; Computer simulation; Computer vision; Digital communication; Digital relays; Filters; Interference; Modems; Multipath channels;
Conference_Titel :
Military Communications Conference, 1988. MILCOM 88, Conference record. 21st Century Military Communications - What's Possible? 1988 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/MILCOM.1988.13404
