Intelligent systems control and multipath protection for next generation digital radios

It is pointed out that technology has advanced to the stage where both the 16 QAM (quadrature amplitude modulation) and 64 QAM high-level modulation techniques are used in digital microwave radios. This new generation of digital radios attains spectral efficiency that is comparable to or better than conventional FM/FDM. Attention is given here to the intelligent system monitor built into a new family of 16-QAM digital radios and to the various propagation protection schemes available for use against multipath fading. Together they make digital radios easy to operate and maintain while providing for the transmission objectives of a digital microwave radio system.