Performance Evaluation of a Noble Multi-task ASIC Chip Available for Multi-level QAM Digital Radio Relay System
Kyoung‐Whoan Suh · Journal of Electrical Engineering and Information Science · 1998
In this paper, as a way of improving the availability and spectral efficiency of radio relay system, a powerful multi-purpose ASIC chip is implemented by virtue of hardware similarity, and its performances are examined by numerical and experimental results for co-channel 64-QAM radio relay system. Moreover, channel analysis for co-channel modelling is presented based upon adaptive equalizer and canceller. By adopting a complex 13-tap adaptive time domain equalizer and cross-pol interference canceller, improvement of more than 1.5 ~ 2.0 dB in signature is obtained in comparison to 9- or 11-tap adaptive time domain equalizer, and about 22.5 dB in improvement factor of cross-pol interference canceller is achieved at C/N of 24.5dB. In addition, it is shown that a 52-tap digital filter makes it possible to optimize the occupied bandwidth by selecting an appropriate roll-off factor for a limited bandwidth.