Adaptive rate transmission with dual noise margins
AssigneeTioga Technologies Inc.
InventorLiron Frenkel
Life of this patent
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Abstract
A method for adaptive-rate communication includes setting a first target signal margin with respect to an actual noise level and a second target signal margin with respect to a predetermined noise level. The actual noise level is measured at a receiver on a communication channel between a transmitter and the receiver. A transmission rate is selected at which to transmit a signal on the channel such that for the selected transmission rate, a first signal-to-noise ratio (SNR) of the signal relative to the measured actual noise level is greater than a baseline SNR level by at least the first target signal margin, and a second SNR of the signal relative to the predetermined noise level is greater than the baseline SNR by at least the second target signal margin.
Claims33
A method for adaptive-rate communication, comprising:
- setting a first target signal margin with respect to an actual noise level and a second target signal margin with respect to a predetermined noise level;
- measuring the actual noise level at a receiver on a communication channel between a transmitter and the receiver;
- and
- selecting a transmission rate at which to transmit a signal on the channel such that for the selected transmission rate, a first signal-to-noise ratio (SNR) of the signal relative to the measured actual noise level is greater than a baseline SNR level by at least the first target signal margin, and a second SNR of the signal relative to the predetermined noise level is greater than the baseline SNR by at least the second target signal margin.
Communication apparatus, comprising:
- a transmitter, configured to transmit a signal over a communication channel at a transmission rate;
- and
- a receiver, adapted to receive the signal over the communication channel, and further adapted to measure an actual noise level on the communication channel, and to cause the transmission rate at which the transmitter is to transmit the signal to be selected such that for the selected transmission rate, a first signal-to-noise ratio (SNR) of the signal relative to the measured actual noise level is greater than a baseline SNR level by at least a first target signal margin, and a second SNR of the signal relative to a predetermined noise level is greater than the baseline SNR by at least a second target signal margin.
A method for bi-directional communication, comprising:
- transmitting single-carrier signals comprising data symbols between first and second Digital Subscriber Line (DSL) modems over a communication channel in upstream and downstream directions within respective upstream and downstream transmission spectra that are at least partly mutually overlapping;
- and
- setting different, respective upstream and downstream bit-loading rates for the symbols in the upstream and downstream directions, responsive to conditions on the channel.
Apparatus for bi-directional communication, comprising first and second Digital Subscriber Line (DSL) modems, mutually linked by a communication channel, the first modem being adapted to transmit downstream over the communication channel to the second modem a first single-carrier signal having a downstream transmission spectrum, the first single-carrier signal comprising first data symbols and having a downstream bit-loading rate, and the second modem being adapted to transmit upstream over the communication channel to the first modem a second single-carrier signal having an upstream transmission spectrum that at least partly overlaps the downstream transmission spectrum, the second single-carrier signal comprising second data symbols with an upstream bit-loading rate lower than the downstream bit-loading rate, wherein the upstream and downstream bit-loading rates are selected responsive to conditions on the channel.
Dependencies are inferred from the claim text.