Title :
Results of a 140 Mbit/s co-frequency cross-polarised 16 QAM trial
Author :
Richman, G.D. ; Gilliland, J.D. ; Vogel, K.
Abstract :
The results of a two-year trial of a cofrequency cross-polarized 16-QAM (quadrature amplitude modulation) system are discussed. A major subrefractive event in the first phase of the experiment that produced considerable median level fading which lasted for several hours, causing approximately 1200 s of outage, is described. After reducing FM interference and improving the flat fade margin from 32 to 42 dB, a cross-polarization interference channel was added. The second phase of the experiment showed that 140-Mb/s cochannel 16-QAM operation is a practical method for providing 140-Mb/s transmission to CCIR performance objectives without cross-polarization interference cancellers
Keywords :
amplitude modulation; digital radio systems; electromagnetic wave polarisation; error statistics; fading; microwave links; radiowave propagation; tropospheric electromagnetic wave propagation; 140 Mbit/s; cofrequency cross-polarised 16-QAM system; cross-polarization interference channel; digital radio link; error rates; flat fade margin; median level fading; microwave link; outage; subrefractive event; test link results; Digital communication; Diversity reception; Frequency; Interference cancellation; Quadrature amplitude modulation; Radio transmitters; Receiving antennas; Telecommunications; Testing; Transmitting antennas;
Conference_Titel :
Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-87942-632-2
DOI :
10.1109/GLOCOM.1990.116622
