Broadband local area network

What is this patent about?

’566 is related to the field of broadband local area networking over existing residential coaxial wiring. It specifically addresses the technical challenges of creating a high-speed data network within a home environment that already contains legacy cable or satellite television signals, passive splitters, and varying qualities of coaxial cable. The invention seeks to overcome the high levels of signal isolation and multipath interference typically found in these uncontrolled RF environments.

The underlying idea behind ’566 is the transformation of a passive, one-way distribution tree into a dynamic, peer-to-peer mesh network through adaptive link optimization. Rather than assuming a uniform channel, the system treats the path between every pair of modems as a unique, potentially asymmetric environment. By using a network controller to coordinate timing and requiring each node to individually probe and characterize its specific connection to every other node, the system can bypass the physical limitations of legacy splitters and cable reflections.

The claims of ’566 focus on a communication circuit and controller that manage the entry and optimization of nodes within a coaxial network. The independent claims specifically cover the mechanism for broadcasting a beacon packet that defines specific time windows for admission, receiving admission requests from new nodes, and executing a formal admission procedure. This procedure includes probing the physical communication link to the new node and adapting transmission parameters based on that probe to ensure reliable data exchange.

In practice, the invention utilizes bit-loaded OFDM to maximize throughput on these characterized links. When a new device joins the network, it listens for the controller’s beacon to synchronize its timing and then sends an admission request. Once admitted, the modems exchange probe packets to determine the signal-to-noise ratio across hundreds of subcarriers. This allows the system to assign higher-order modulation to clear frequencies while avoiding deep notches caused by signal reflections at splitters.

This approach differs from prior solutions by moving away from fixed frequency plans or rigid master-slave architectures that struggle with the high isolation of home splitters. By establishing a Network Controller that can migrate between devices and employing a handshake process that optimizes each individual path, the invention allows for robust, high-bandwidth communication without requiring the homeowner to replace their existing wiring or hardware. It effectively turns a noisy, dispersive medium into a reliable backbone for streaming high-definition video and data.