Communication system with proactive network maintenance and methods for use therewith
View Patent ↗A transmitter for use in a cable modem termination system includes a data processing module that generates a plurality of OFDM symbols from a data packet. A probe symbol generator generates a probe symbol, as one of a plurality of probe symbol types. The probe symbol is selectively inserted within the plurality of OFDM symbols, at a pre-defined probe symbol interval.
1. A cable modem termination system (CMTS) that communicates with a cable modem via a cable plant, the cable modem termination system comprising:
a data processing module configured to generate a plurality of orthogonal frequency division multiplexed (OFDM) symbols of a data packet, to capture a full OFDM symbol as first capture data and to generate a physical layer link channel (PLC) message block for the data packet based on the capture of the full OFDM symbol; and
a modulator configured to generate an RF signal from the plurality of OFDM symbols and the PLC message block for transmission via a downstream channel to the cable modem;
wherein the cable modem captures the full OFDM symbol received via the downstream channel as second capture data and wherein the capture of the full OFDM symbol received via the downstream channel is synchronized via the PLC message block received via the downstream channel.
2. The cable modem termination system of claim 1 wherein feedback data that includes the second capture data is generated by the cable modem and sent to the CMTS for analysis.
3. The cable modem termination system of claim 2 wherein the analysis includes characterization of linear and nonlinear response of the downstream channel.
4. The cable modem termination system of claim 1 wherein the first capture data includes frequency domain data.
5. The cable modem termination system of claim 4 wherein the frequency domain data includes I and Q modulation samples of all subcarriers in active bandwidth of the downstream channel.
6. The cable modem termination system of claim 5 wherein all subcarriers includes data subcarriers, pilots, PLC preamble symbols, and excluded subcarriers.
7. The cable modem termination system of claim 4 wherein the second capture data includes time domain data.
8. The cable modem termination system of claim 7 wherein the time domain data includes I and Q samples of the full OFDM symbol.
9. The cable modem termination system of claim 7 wherein the time domain data includes I and Q samples of the full OFDM symbol not including aguard interval.
10. The cable modem termination system of claim 4 wherein the second capture data includes at least a bit indicating if receiver windowing effects are present.
11. A cable modem termination system (CMTS) that communicates with a cable modem via a cable plant, the cable modem termination system comprising:
a data processing module configured to generate a plurality of orthogonal frequency division multiplexed (OFDM) symbols of a data packet, to capture a full OFDM symbol as first capture data and to generate a physical layer link channel (PLC) message block for the data packet that indicates location of the full OFDM symbol in the data packet via a symbol select field; and
a modulator configured to generate an RF signal from the plurality of OFDM symbols and the PLC message block for transmission via a downstream channel to the cable modem;
wherein the cable modem receives the data packet via the downstream channel, and wherein the receiving includes determining the location of the full OFDM symbol in the data packet via the symbol select field of the PLC message block and capturing the full OFDM symbol as second capture data.
12. The cable modem termination system of claim 11 wherein feedback data that includes the second capture data is generated by the cable modem and sent to the CMTS for analysis.
13. The cable modem termination system of claim 12 wherein the analysis includes characterization of linear and nonlinear response of the downstream channel.
14. The cable modem termination system of claim 11 wherein the first capture data includes frequency domain data.
15. The cable modem termination system of claim 14 wherein the frequency domain data includes I and Q modulation samples of all subcarriers in active bandwidth of the downstream channel.
16. The cable modem termination system of claim 15 wherein all subcarriers includes data subcarriers, pilots, PLC preamble symbols, and excluded subcarriers.
17. The cable modem termination system of claim 14 wherein the second capture data includes time domain data.
18. The cable modem termination system of claim 17 wherein the time domain data includes I and Q samples of the full OFDM symbol not including aguard interval.
19. The cable modem termination system of claim 14 wherein the second capture data includes at least a bit indicating if receiver windowing effects are present.
20. A method comprising:
generating, via a cable modem termination system, a plurality of orthogonal frequency division multiplexed (OFDM) symbols of a data packet;
capturing, via the cable modem termination system, a full OFDM symbol as first capture data;
generating, via the cable modem termination system, a physical layer link channel (PLC) message block for the data packet that indicates location of the full OFDM symbol in the data packet via a symbol select field; and
generate, via the cable modem termination system, an RF signal from the plurality of OFDM symbols and the PLC message block for transmission via a downstream channel to a cable modem; and
receiving from the cable modem, via the cable modem termination system, second capture data generated by the cable modem by capturing the full OFDM symbol, wherein the cable modem determines the location of the full OFDM symbol in the data packet via the symbol select field of the PLC message block.