By Dr. Ofir Shalvi, Noam Geri, Ariel Yagil, Daniel Wajcer, Texas Instruments, Broadband Communications Group
This paper presents a new generation of Cable Modem and Cable Modem Termination Systems (CMTS) which utilize an advanced upstream Physical Layer technology known as ‘HI PHY Lite’ or ‘Advanced TDMA’, which increases the upstream capacity and improves robustness to common channel impairments while maintaining full backward compatibility to DOCSIS 1.1 systems.
In this paper we will provide an overview on the HI PHY Lite Modulation scheme, and will present data on the performance of the HI PHY Lite system in various channel. We will demonstrate how HI PHY Lite systems provide MSOs an evolutionary path to increasing the capacity of the CATV reverse channel, thereby allowing operators to offer their subscribers greater upstream bandwidth for various services such as video conferencing and telephony.