Title :
Design and Realization of a 16 QAM-Modem for a 140 Mb/s Digital Radio System Family
Author :
Nossek, Josef A. ; Barth, Hermann
Abstract :
A 16 QAM-modem for 140 Mb/s radio systems is described, with which a spectral efficiency of 3.5 bit/s/Hz is achieved. In the digital signal processing parts extensive use is made of ECL gate arrays. Spectrum shaping according to Nyquist´s criterion is performed in the IF with the aid of SAW-bandpass filters (¿ = 0.5). Experimental results obtained with this modem are reported. The incorporation of an adaptive baseband equalizer employing a complex transversal filter is discussed.
Keywords :
Bit rate; Clocks; Decoding; Demodulation; Digital communication; Digital signal processing; Equalizers; Modems; Multiplexing; Transversal filters;
Conference_Titel :
Microwave Conference, 1983. 13th European
Conference_Location :
Nurnberg, Germany
DOI :
10.1109/EUMA.1983.333305
