16 QAM and adjacent channel interference
Abstract
Experimental results are presented on the performance of a sample 16 QAM digital radio with and without adjacent digital channel operation. The penalty imposed by such operation for nondiversity systems was barely measurable (if at all), while the penalty imposed by such operation for diversity systems was negligible. The two-way unavailability is 0.015% annually with the use of space diversity and adaptive equalization on 160 25-mile hops (i.e., a 4000 mile route) with adjacent channel digital interference. It is concluded that the use of space diversity in combination with adaptive equalizers is a powerful tool in overcoming the disruptive effects of multipath fading.
- Publication:
-
ICC 1981; International Conference on Communications, Volume 1
- Pub Date:
- 1981
- Bibcode:
- 1981icc.....1...13G
- Keywords:
-
- Amplitude Modulation;
- Channel Noise;
- Electromagnetic Interference;
- Multichannel Communication;
- Radio Communication;
- Reception Diversity;
- Adaptive Control;
- Cross Coupling;
- Digital Systems;
- Equalizers (Circuits);
- Multipath Transmission;
- Signal Distortion;
- Signal Fading;
- Transmission Efficiency;
- Communications and Radar