TCP for high performance in hybrid fiber coaxial broad-band access networks
IEEE/ACM Transactions on Networking (TON)
Low Power Digital Frequency Conversion Architectures
Journal of VLSI Signal Processing Systems - Special issue on future directions in the design and implementations of DSP systems
Feasibility Model Implementation and Evaluation of an HFC S-CDMA Broadband Return Channel Concept
ECMAST '99 Proceedings of the 4th European Conference on Multimedia Applications, Services and Techniques
NETWORKING '02 Proceedings of the Second International IFIP-TC6 Networking Conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; and Mobile and Wireless Communications
Research: An ATM-friendly MAC for traffic concentration in HFC systems
Computer Communications
Using proxies to enhance TCP performance over hybrid fiber coaxial networks
Computer Communications
| Hi-index | 0.25 |
The authors have examined the basic characteristics of hybrid-fiber coax (HFC) return systems to evaluate their ability to support bidirectional communications. The ability to support bidirectional communications on cable plants will allow deployment of two-way video applications as well as telecommunications services over the HFC plant. The results of the studies indicate that ingress in the cable return path is primarily due to broadcast signals which accumulate due to the noise-funneling effect of the cable return. Although this ingress can manifest itself in strong narrowband interferers which will prevent the use of large bandwidth channels, a reduction of node size to nodes on the order of 500 homes or lower will reduce the amount of interference. Filtering, in which a portion of the spectrum is blocked from the subscriber residence may also result in a significant reduction of ingress. Other phenomena on the return path can be dealt with by means of sound communication system design, including forward error correction to deal with impulse noise, and adaptive equalizers to deal with reflections in high data rate designs. TDMA, FDMA, and CDMA can all be utilized on the cable return path, but the capacities which result when less than perfectly synchronized CDMA is utilized are substantially lower than for TDMA and FDMA. A single carrier TDMA approach will be highly susceptible to narrowband interferers, and is unlikely to be successful. For these reasons a TDMA/FDMA or pure FDMA approach with narrow channels is likely to be the most robust multiple access technique for the cable return path