초록 ▼

A modular home-networking communications system which uses a physical layer modulation scheme suitable for transmission in both RF and powerline communication channels. The modulation system is based on direct-sequence spread-spectrum (DS-SS) using Barker codes to spread the information symbols, whi

A modular home-networking communications system which uses a physical layer modulation scheme suitable for transmission in both RF and powerline communication channels. The modulation system is based on direct-sequence spread-spectrum (DS-SS) using Barker codes to spread the information symbols, which provides both operation at low signal to noise ratio and very good resistance to time dispersion distortion due to the excellent autocorrelation properties of the Barker codes. This type of modulation system is ideal for the powerline communications channel since it spreads the transmission power over a wide range of frequency, lowering the power spectral density enough that it will provide long distance coverage without violating FCC radiated emission and conducted power regulations.

대표청구항 ▼

[ What is claimed is:] [1.]1. A network communications system, comprising:a network device;a plurality of channel interface units for operatively interfacing said network device to one of a plurality of disparate communication channels, each of said plurality of channel interface units being operati

[ What is claimed is:] [1.]1. A network communications system, comprising:a network device;a plurality of channel interface units for operatively interfacing said network device to one of a plurality of disparate communication channels, each of said plurality of channel interface units being operatively compatible with a corresponding one of said plurality of disparate communication channels;a baseband modem, interchangeably connectable to any one of said plurality of channel interface units, for encoding and decoding data transmitted between said network device and one of said plurality of disparate communication channels, wherein said baseband modem is operatively compatible with each of said plurality of disparate communication channels; anda MAC (media access control) processor, operatively connected between said network device and said baseband modem, for controlling the transfer of data between said network device and said baseband modem, wherein said MAC processor is operatively compatible with each of said plurality of disparate communication channels.