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US 9,425,856 B2Granted
System and method for multi-dimensional modulation schemes with high noise immunity and low emission idle signaling for automotive area networks
AssigneeBroadcom Corporation
InventorsAhmad Chini, Mehmet Vakif Tazebay
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Abstract
System, method and apparatus for multi-dimensional modulation schemes with high noise immunity and low emission idle (LEI) signaling for automotive area networks. An extra zero constellation point can be used during an idle mode and extra constellation points can be assigned to control signals.
Claims24
A method, comprising:
- transmitting, from a first device to a second device, data using a multi-dimensional signal constellation;
- and
- transmitting, from the first device to the second device, during an idle mode, a zero constellation point in the multi-dimensional signal constellation and a refresh signal, wherein a duration of the refresh signal is less than a time interval for determining a peak emissions value, and wherein the time interval is defined by a resolution bandwidth of a measurement filter used in determining the peak emissions value.
A method, comprising:
- receiving, at a first device from a second device, a sequence of one or more multidimensional signal constellation symbols;
- identifying, based on the received sequence of one or more multi-dimensional signal constellation symbols, a transition from a data mode to an idle mode, wherein the received sequence of one or more multi-dimensional signal constellation symbols includes a constellation point in the multi-dimensional signal constellation, which is not used for sending data;
- receiving a zero constellation point in the multi-dimensional signal constellation during a quiet portion of the idle mode;
- and
- receiving a refresh signal;
- wherein the quiet portion and the refresh signal together comprise a refresh cycle, and a ratio of a duration of the refresh cycle to a duration of the refresh signal is equal to or greater than approximately twenty;
- and
- wherein the duration of the refresh signal is less than a time interval for determining a peak emissions value.
5 more elements
A device, comprising:
- a modulator that is configured to assign data to constellation points in a multidimensional signal constellation;
- and
- a transmitter that is configured to transmit data to a receiver using constellation points assigned to data in a data mode, transmit a zero constellation point in the multidimensional signal constellation during a quiet portion of an idle mode, and transmit a refresh signal;
- wherein a duration of the refresh signal is less than a time interval for determining a peak emissions value.
1 more element
Dependencies are inferred from the claim text.