US 7,295,518 B1
Broadband network for coaxial cable using multi-carrier modulationGeneral
US 7,295,518 B1
Broadband network for coaxial cable using multi-carrier modulation
Tech Center:
2600 Communications
Examiner:
Afsar Qureshi
Art Unit:
2616 Computer Graphic Processing, 3D Animation, Display Color Attribute, Object Processing, Hardware and Memory
Inventors:
Anton Monk; Brett Bernath; Itzhak Gurantz; Ladd El Wardani; Ron Porat
Assignee:
Priority:
08/30/01
Filed:
12/18/02
Granted:
11/13/07
Expiration:
09/11/24
Abstract
A broadband local area data network uses coaxial cable wiring for interconnection of terminal devices. Orthogonal frequency division multiplexing (OFDM) with bit loading is used to overcome channel impairments and provide a path for terminal devices to transmit to and receive from other terminal devices. Probe messages are sent between devices to characterize the communication channel and determine optimum bit loading. The data network shares the cable spectrum with other services and uses frequency bands not used by other services. Adaptive power control can be used to maintain signal to noise ratio in a communication between terminal devices. Frequency coordination can be used to avoid interference between the LAN communications and other services transmitted on the cable.