Amplitude control in a variable load environment
First Claim
1. A system, comprising:
- a symbol generator including;
a waveform generator configured to output waveforms at a plurality of selectable fundamental frequencies and with a selectable duty cycle; and
a bandpass filter having a pass-band that is within a communications channel of a communications network;
data processing apparatus operable to interact with the symbol generator and to perform operations including;
determining that at least a threshold number of endpoints that receive symbols from the symbol generator are experiencing a same type of transmission error; and
in response to the determination, causing the waveform generator to adjust at least one of the fundamental frequency or a duty cycle of the waveforms, wherein the fundamental frequency is adjusted to a frequency having a harmonic that is within the pass-band.
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Accused Products
Abstract
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for varying symbol amplitude. In one aspect, a system includes a symbol generator that includes a waveform generator configured to output waveforms at a plurality of selectable fundamental frequencies and with a selectable duty cycle. The symbol generator can also include a bandpass filter having a pass-band that corresponds to a communications channel of a communications network. The system can also include data processing apparatus operable to interact with the symbol generator and further operable to determine that at least a threshold number of endpoints that receive symbols from the symbol generator are experiencing a same type of transmission error. In response to the determination, the data processing apparatus can cause the waveform generator to adjust at least one of the fundamental frequency or a duty cycle of the waveforms. The fundamental frequency can be adjusted to a frequency having a harmonic that is within the pass-band.
53 Citations
20 Claims
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1. A system, comprising:
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a symbol generator including; a waveform generator configured to output waveforms at a plurality of selectable fundamental frequencies and with a selectable duty cycle; and a bandpass filter having a pass-band that is within a communications channel of a communications network; data processing apparatus operable to interact with the symbol generator and to perform operations including; determining that at least a threshold number of endpoints that receive symbols from the symbol generator are experiencing a same type of transmission error; and in response to the determination, causing the waveform generator to adjust at least one of the fundamental frequency or a duty cycle of the waveforms, wherein the fundamental frequency is adjusted to a frequency having a harmonic that is within the pass-band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method performed by data processing apparatus, the method comprising:
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selecting a first fundamental frequency for symbols that are transmitted to endpoints in a communications system, the first fundamental frequency being selected so that a baseline harmonic of the first fundamental frequency is within a downstream channel over which data are transferred from a substation to the endpoints, the baseline harmonic being at least a second harmonic of the first fundamental frequency; receiving status data from the endpoints, the status data for each endpoint specifying a number of bit errors that have been detected by the endpoint; determining that the status data from at least a threshold number of the endpoints specify a number of bit errors that exceeds a threshold number of bit errors; and adjusting the first fundamental frequency to a second fundamental frequency that is higher than the first fundamental frequency, the second fundamental frequency being a frequency at which a lower harmonic than the baseline harmonic is within the downstream channel. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method performed by data processing apparatus, the method comprising:
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transmitting symbols from a substation to endpoints in a communications network, the symbols being transmitted at a first frequency and amplified at an amplification factor, the first frequency being a harmonic of a fundamental frequency for the symbols, the harmonic being within a downstream channel over which the substation communicates with the endpoints; receiving transmission quality data specifying a measure of transmission quality for the symbols; determining that at least a threshold number of endpoints in the communications network are experiencing a same type of transmission error; adjusting the fundamental frequency based on the type of transmission error, the fundamental frequency being adjusted so that a different harmonic of the adjusted fundamental frequency is within the downstream channel; and transmitting the symbols over the downstream channel, the symbols being generated at the fundamental frequency and amplified at the amplification factor.
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19. A method performed by data processing apparatus, the method comprising:
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generating a first symbol at a first fundamental frequency; filtering the first symbol with a filter having a pass-band that includes a harmonic frequency of the first fundamental frequency; amplifying the filtered first symbol at an amplification factor; determining that at least a threshold number of communications errors are occurring at endpoints to which the first filtered symbols are being transmitted; generating a second symbol at a second fundamental frequency that is different than the first fundamental frequency, the second fundamental frequency having a harmonic that is within the pass-band; filtering the second symbol with the filter; and amplifying the second filtered symbol at the amplification factor.
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20. A non-transitory computer storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising:
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selecting a first fundamental frequency for symbols that are transmitted to endpoints in a communications system, the first fundamental frequency being selected so that a baseline harmonic of the first fundamental frequency is within a downstream channel over which data are transferred from a substation to the endpoints, the baseline harmonic being at least a second harmonic of the first fundamental frequency; receiving status data from the endpoints, the status data for each endpoint specifying a number of bit errors that have been detected by the endpoint; determining that the status data from at least a threshold number of the endpoints specify a number of bit errors that exceeds a threshold number of bit errors; and adjusting the first fundamental frequency to a second fundamental frequency that is higher than the first fundamental frequency, the second fundamental frequency being a frequency at which a lower harmonic than the baseline harmonic is within the downstream channel.
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Specification