High-speed serial interface for orthogonal frequency division multiplexing (ofdm) cable modems
AssigneeMaxLinear, Inc.
InventorShaul Shulman
Life of this patent
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Abstract
A high-speed serial interface (HSIF) for communicating between an analog front end (AFE) and a System on a Chip (SoC) digital radio via a bi-directional serial bit connection for an OFDM cable modem includes generating Status Frames and Data Frames to be communicated between the tuner and AFE and sending the generated Status Frames and Data Frames on a continual basis. Each Frame is a 10-bit K.28 Comma Sync word followed by a payload and when no data is queued to be communicated, Status Frames are sent asynchronously as filler frames.
Claims22
A communication device in an orthogonal frequency division multiplexing (OFDM) enabled modem having an analog front end (AFE) and a digital radio, the communication device comprising:
- the AFE configured to send and receive OFDM modem channels, down convert received OFDM channels into a plurality of I and Q digital samples, the AFE including a high-speed serial interface (HSIF) to communicate the plurality of OFDM I and Q digital samples to the digital radio by continually generating and transferring downstream frames to the digital radio, wherein the downstream frames include data frames and status frames comprising a K.28 Comma Sync word followed by a payload.
A device configured to communicate orthogonal frequency division multiplexed (OFDM) signals upstream and downstream with a network, the device comprising:
- a digital radio including a high speed serial interface (HSIF) to receive digital samples of two OFDM downstream radio frequency (RF) channels and digital samples of two downstream quadrature amplitude modulated (QAM) channels from a separately provided analog front end (AFE), the HSIF sending and receiving constant frames over a bi-directional serial connection to and from the AFE in the form of status and data frames, said status and data frames comprising a K.28 Comma Sync Word and a payload.
A method for communicating data in a cable modem using a high-speed serial interface (HSIF), the method comprising:
- forming downstream frames comprising a K28 Comma word and a payload;
- continually transferring the formed downstream frames including status frames and data frames, the data frames including complex baseband samples for OFDM channels received by said cable modem in their payload, wherein when no data is needed to be transferred, status frames are inserted asynchronously as filler frames.
Dependencies are inferred from the claim text.