Equaliser timing considerations for microwave digital radio during deep multipath fading

An examination is made of a high-level 64 QAM modulation system operating in conjunction with digital linear and nonlinear equalizers and digital timing recovery techniques. Results illustrate the difficulty of maintaining acceptable performance during fading. The problem of timing recovery during deep minimum- and nonminimum-phase fades is discussed, along with means of limiting the tracking ability of a timing circuit during a deep fade