Cofrequency Cross-Polarized Operation of a 91 Mbit/s Digital Radio
- 1 January 1984
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Communications
- Vol. 32 (1) , 87-91
- https://doi.org/10.1109/TCOM.1984.1095948
Abstract
Current digital radio systems have spectral efficiencies of only half that attained by FDM-FM analog systems. This paper describes a system, that exploits the inherent ruggedness of digital modulation and the concept of frequency reuse to achieve spectral efficiencies of 4.5 bits/s/Hz which is comparable to that achieved by analog systems. The major technical challenge in implementing such a system was devising a means to maintain adequate cross-polarization discrimination during multipath fading. Details are given on extensive digital and analog field experiments that were conducted to verify that cofrequency cross-polarized operation during multipath fading was feasible. The key to achieving satisfactory performance is shown to be the use of space diversity with in-phase combining.Keywords
This publication has 2 references indexed in Scilit:
- The Effect of Selective Fading on Digital RadioIEEE Transactions on Communications, 1979
- Experimental evidence of cross-polarization discrimination deterioration during rain and multipath fading at 4 GHzPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1973