Abstract
This paper describes the desired performance for digital microwave links (Field Pick-up Units in Japan) in the 7-GHz band and the simulated performance of an adaptive equalizer used for a digital multilevel QAM System. A requirement for the digital microwave links is that they must exceed analog systems in their performance, but must have reduced hardware complexity. The desired performance for the digital microwave links is : Echo DUR=10 dB and CNR=27 dB for standard transmission. However, echo DUR=0 dB with its delay time less than or equal to 30-50 ns for long-distant transmission.In addition, introduction of the reference signal makes it possible for a decision feedback equalizer to start its operation in the DUR=0 dB multipath environment.
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