Abstract: Devices, systems and methods that reduce funneling noise in upstream data transmissions from modems providing the transmissions through respective RF legs connected to the node. Preferred devices and systems may include a node that is configured to selectively isolate respectively scheduled upstream data signals from noise present on any RF leg not propagating a scheduled upstream data signal.

Abstract: Systems and methods for permitting DOCSIS 3.1 equipment to operate at higher frequencies than specified in the DOCSIS 3.1 standard. Exemplary systems may be capable of alternating between a first mode of operation that provides DOCSIS 3.1 compatible services and a second mode of operation providing a higher level of service than DOCSIS 3.1.

Abstract: The generation of OFDM signals for DOCSIS 3.1 specification having a required number of subcarriers and subcarrier spacing can be based on a sampling rate that is modified from that defined by the DOCSIS 3.1 specification. In embodiments, the base sampling rate is defined as Fs=204.8*A MHz (A>1), with a respective increase of basic IFFT size by factor A. In embodiments, the OFDM signal is sampled at a sampling rate of 204.8 MHz*A for an IFFT size of 8192*A (4096*A), where A>1.

Abstract: The generation of OFDM signals for DOCSIS 3.1 specification having a required number of subcarriers and subcarrier spacing can be based on a sampling rate that is modified from that defined by the DOCSIS 3.1 specification. In embodiments, the base sampling rate is defined as Fs=204.8*A MHz (A>1), with a respective increase of basic IFFT size by factor A. In embodiments, the OFDM signal is sampled at a sampling rate of 204.8 MHz*A for an IFFT size of 8192*A (4096*A), where A>1.

Abstract: Methods, systems, and apparatus can provide a multichannel interpolator while optimizing circuitry reuse.

Abstract: A nyquist filter upsamples multiple input symbol streams. Separate first stage branch low-pass filters further upsample the streams. A tap at each filter has a delay different from the other branch(s) to extract symbols from different streams. The outputs of the low-pass filters are additively combined in one branch and are subtracted in another. The outputs from the additive and subtraction combiners are provided to corresponding multipliers that multiply by real cosine and sine functions, respectively. The outputs of the multipliers are alternatingly combined (alternates during every clock cycle between addition and subtraction) at a first stage combiner. A second stage processes the output of the first stage combiner similarly to processing performed by the first stage. The output of the second stage alternating combiner is the input symbol streams in baseband with carriers spaced apart by a predetermined frequency based on the real function used by the real multipliers.