140 Mbit/S 32QAM XPIC Trial Results

The frequency reuse technique can be adopted for doubling the capacity (Bits/Hertz) of digital radio systems. The newly developed 140MBs/32QAM Telettra Modems equipped with Crous Polar Interference Canceller (XPIC) have been tested sucsfully on a 6OKm-4GHz link in the North of Italy. This paper presents the msin experimental results observed during the period August-December 1991 (about 2200 hours). A first conclusion is that the performance of a 2×140MB/s-32QAM system is comparable to a 1×14OMB/s-16QAM system in the same path conditions. The good XPIC performance in terms of outage probability reduction and sync-recovering speed shows the soundness of design and constructions technologies.