1) PROBLEM in 2011 Comcast was trying to find a remedy to upstream noise on this whole channel bonding thing and they tested S-CDMA. But guess what, they and all carriers went with FDMA which is what Chanbod tech is...Cisco, who is the cable operators partners on the tech used, calls it OFDM, but OFDM was just shut down by the patent board.
One challenge of upstream bonding is to find eligible channels to bond, since most capacity in the lower part of the spectrum (usually in the range of 5MHz to 20MHz) is unusable due to high noise levels.
One emerging remedy is S-CDMA (Synchronous Code Division Multiple Access), an advanced PHY that can blast through that noise. It can free up channels to beef up single-channel upstream speeds, or it can be applied to a bonded channel group. Motorola Inc. (NYSE: MOT) has been championing that technology lately, and has notched field trials with Cox Communications Inc. and still-unnamed MSOs in South America, Europe, and Asia.
The PTAB rejected Cisco’s assertion that multiple channels are multiplexed on the same frequency bands, and that code channels or CDMA channels could be an RF channel within the meaning of the ‘679 patent. The panel cited an inconsistent statement by Cisco’s expert which described a FDMA and CDMA hybrid system using Walsh codes: “[t]he mutual orthogonality of Walsh codes allows one particular coded channel to be isolated and decoded from all other coded channels, even though they are all broadcasting on the same RF channel.” (italics added by the panel). The panel reasoned that this statement referred to a particular frequency band as an “RF channel” and to divisions within the RF channel as “coded channels,” and therefore gave no weight to the expert’s testimony regarding the meaning of “RF channel.”
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