Research Of A Duplexing Communication Platform For Cable Network Based On COFDM

The application and new business of IPV6 appear with the rapid growth of the Internet, which cause the rely on the bandwidth and integrated services in modern society. A integrated terminal with information inside can reduce the cost of users and enable people to receive the reliable text audio and video information in a short time.CATV broadband access technology can show us a high cost-effective scheme to solve this problem. As this technology makes full use of CATV network bandwidth and the inherent merits of the medium for transmission, it has become one of the most attractive technologies over the world. Uplink channel access technologies is the key point of the CATV broadband access network and is also the two-way digital TV set-top-box technology research focus. Access technologies directly relate to the performance and the control of network.By analysising HFC Channel features especially the uplink noise and the existing traditional schemes used in cable television network, the advantage and disadvantage of them can be see obviously and the most valuable scheme emerged. The research of the RS code, the Viterbi algorithm and OFDM system show that the process of COFDM system that can used for the communication in the upload channel. The improve of performance of the coding system can be clearly see by simulation of the actual system performance using Matlab, then got the feasible scheme. Finally, we choose a chip that based on the ARM core, and use its various interface, develop the entire hardware platform. The coding techniques used in the platform makes it optimized according to different transmission media and channel noise, so as to achieve the best performace. When technology to be further improved, it is entirely a low-cost business solutions. This platfrom can be integrated in the new generation of set-top-box system which can achieve various interactive functions.