Prototyping Quadrature Amplitude Modulation for Two-way Communication on CATV Networks
Rudy Lauwereins, M. Adé, Marc Moonen, P. Vandaele, Patrick R. Schaumont · 1996
The recently discovered potential of two-way communication on CATV networks for advanced telecommunications applications like video-on-demand, spawned research and development in modem design for up-stream communication. This paper reports on the prototyping of such a 16QAM modem and compares the achievable sample rates on 4 DSP processors to simulation speeds obtained on a powerful workstation. 2. Introduction Recently, coaxial cable networks have received much attention in the context of interactive application [1,2]. In countries with a high penetration of CATV (e.g. Belgium >90%), the cable network forms a viable alternative to classical telephone networks. Envisaged applications are telephony, interactive television, home-shopping, video-ondemand, high-speed Web browsing, etc. The interactive nature of these services requires however two-way communication on a network that initially was only intended for a one-way broadcasting of television signals. What is aimed at now, is a lo...