Signaling over noisy channels
First Claim
1. A transmitter for transmitting an arbitrary datum over a channel of a communication carrier and for sending a signal over the channel comprising:
- (a) a modem for modulating the arbitrary datum according to a modulation scheme; and
(b) a signaling shifter to modify the communication carrier according to a modification scheme;
wherein said modification scheme further includes a pattern of modifications, andwherein the transmitter further comprises;
(c) a signaling pattern generator for controlling said shifter; and
wherein said modulation scheme includes modulating a symbol onto the carrier over a symbol period and said signaling pattern includes a plurality of said modifications within said symbol period.
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Accused Products
Abstract
The present invention relates to a system and method for signaling among a plurality of devices via a communication carrier over a noisy medium such as a power line and particularly relates to an innovative method and system for high speed signaling using an innovative modulating scheme. The scheme is particularly well adapted for signaling over multiple channels and over direct current (DC) power lines. At the transmitter end, a modem modulates data to be transmitted according to a modulation scheme and a signaling shifter modifies the carrier according to a modification scheme. At the receiver end, a modem demodulates the data according to the modulation scheme and a detector detects the signal in accordance with the modification scheme. Signals may be received over multiple channels. A signal is sent over a subset of the channels. Remaining channels can be used for competing signals avoiding interference. The channel chosen for sending a signal may also indicate signal priority. An innovative device is presenting for testing communication over DC power lines with adjustable attributes.
65 Citations
22 Claims
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1. A transmitter for transmitting an arbitrary datum over a channel of a communication carrier and for sending a signal over the channel comprising:
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(a) a modem for modulating the arbitrary datum according to a modulation scheme; and (b) a signaling shifter to modify the communication carrier according to a modification scheme; wherein said modification scheme further includes a pattern of modifications, and wherein the transmitter further comprises; (c) a signaling pattern generator for controlling said shifter; and
wherein said modulation scheme includes modulating a symbol onto the carrier over a symbol period and said signaling pattern includes a plurality of said modifications within said symbol period.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A receiver for receiving an arbitrary datum from a channel of a communication carrier and for receiving a signal over the channel comprising:
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(a) a modem for demodulating the arbitrary datum, the datum having been modulated by a modulation scheme; and (b) a detector to detect the signal, the signal having been sent via modifications of the carrier according to a modification scheme; wherein said modification scheme includes a pattern of modifications to the carrier; wherein the receiver further comprises; (c) a processor for identifying said pattern; and wherein said modulation scheme includes modulating a symbol onto the carrier over a symbol period and said pattern includes a plurality of said modifications within said symbol period. - View Dependent Claims (11, 12, 13, 14)
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15. A method of signaling during communication by a plurality of devices over a plurality of channels, comprising the steps of:
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(a) sending a first signal from a first device of the plurality of devices on a first channel of the plurality of channels, by steps including; (i) modulating a carrier of said first channel by a modulation scheme for transmitting an arbitrary datum, and (ii) modifying said carrier by a modification scheme for sending said first signal; and (b) listening by a second device for said signal over a subset of the plurality of channels, said subset containing said first channel and at least one other channels, wherein said second device includes a transmitter and said listening is for the sake of collision detection; and wherein the method further comprises the steps of; (c) resolving said collision; and (d) assigning a signal priority level to said first signal; and wherein said resolving is according to said signal priority level. - View Dependent Claims (16, 17, 18)
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19. A system for testing communication amongst a plurality of devices over a medium comprising:
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(a) an adjuster to change an attribute of the medium; and (b) a DC power supply for supplying a DC voltage to the devices, the DC power supply being decoupled from transmissions by the devices. - View Dependent Claims (20)
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21. A system for communicating via a medium, comprising:
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(a) a plurality of devices for communicating via the medium, each said device including a transmitter for transmitting an arbitrary datum over a channel of a communication carrier via the medium and for sending a signal over the channel, each said transmitter including; (i) a modem for modulating the arbitrary datum according to a modulation scheme, and (ii) a signaling shifter to modify the medium according to a modification scheme; and (b) a testing subsystem for testing the communicating by said plurality of devices, said testing subsystem including; (i) an adjuster to change an attribute of the medium, and (ii) a DC power supply for supplying a DC voltage to the devices, the DC power supply being decoupled from transmissions by the devices.
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22. A method of signaling during communication by a plurality of devices over a channel, comprising the steps of:
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(a) sending a first signal from a first device of the plurality of devices on the channel, by steps including; (i) modulating a carrier of the channel by a modulation scheme for transmitting an arbitrary datum, and (ii) modifying the carrier by a modification scheme for sending said first signal; and (b) listening by a second device for said signal on the channel for the sake of collision detection, said second device including a transmitter; (c) resolving said collision; and (d) assigning a signal priority level to said first signal;
said resolving being according to said signal priority level.
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Specification