Abstract
A 16QAM modem for 140-Mbit/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 ( rho equals 0. 5). Experimental results obtained with this modem are reported. The incorporation of an adaptive baseband equalizer employing a complex transversal filter is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 233-238 |
| Number of pages | 6 |
| Journal | Telcom Report (English Edition) |
| Volume | 6 |
| Issue number | 5 |
| State | Published - 1983 |