Data transmission with room illuminations having light emitting diodes
First Claim
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1. A method for transmitting data by means of a plurality of light emitting diodes, comprising the steps of:
- grouping the light emitting diodes into plurality of groups;
assigning a unique subset of the light emitting diode groups to each of a plurality of different n-bit data values;
transmitting a sequence of n-bit data values by;
for each n-bit data value;
identifying the subset of light emitting diode groups assigned to that n-bit data value, andtransmitting the n-bit data value by a collective modulation, comprising a collective increase or decrease, of an intensity emitted by the light emitting diodes of the identified subset of light emitting diode groups; and
wherein for each n-bit data value, the collective intensity modulation for transmitting that data value is performed between non-data-transmission periods having longer durations than that of the collective intensity modulation, wherein the light emitting diodes are not modulated during the non-data-transmission periods, and wherein the emitted intensity of the plurality of light emitting diodes during the transmission of each data value is greater than or less than the emitted intensity of the plurality of light emitting diodes during non-data-transmission periods; and
periodically varying the assignments of the subsets of the light emitting diode groups corresponding to the different n-bit data values.
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Abstract
Lamps having light emitting diodes configured for data transmission require the high-frequency circuit of higher power. In order to simplify the required electronics, the light emitting diodes are divided into groups and the groups are modulated differently. Due to the multilevel modulation, the symbol rate can be reduced with the data rate remaining the same, thus reducing the switching rate and the circuitry complexity.
38 Citations
22 Claims
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1. A method for transmitting data by means of a plurality of light emitting diodes, comprising the steps of:
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grouping the light emitting diodes into plurality of groups; assigning a unique subset of the light emitting diode groups to each of a plurality of different n-bit data values; transmitting a sequence of n-bit data values by; for each n-bit data value; identifying the subset of light emitting diode groups assigned to that n-bit data value, and transmitting the n-bit data value by a collective modulation, comprising a collective increase or decrease, of an intensity emitted by the light emitting diodes of the identified subset of light emitting diode groups; and wherein for each n-bit data value, the collective intensity modulation for transmitting that data value is performed between non-data-transmission periods having longer durations than that of the collective intensity modulation, wherein the light emitting diodes are not modulated during the non-data-transmission periods, and wherein the emitted intensity of the plurality of light emitting diodes during the transmission of each data value is greater than or less than the emitted intensity of the plurality of light emitting diodes during non-data-transmission periods; and periodically varying the assignments of the subsets of the light emitting diode groups corresponding to the different n-bit data values. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 2. The method according to claim l, wherein the plurality of light emitting diodes provide a substantially constant intensity for room illumination during the transmission of the data.
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15. An arrangement for transmitting data comprising:
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a plurality of light emitting diodes, wherein the light emitting diodes are grouped together into a plurality of light emitting diode groups; electronic circuitry configured to transmit a sequence of n-bit data values by; for each n-bit data value; determining a subset of light emitting diode groups for transmitting that n-bit data value, and transmitting the n-bit data value by a collective modulation, comprising a collective increase or decrease, of an intensity emitted by the light emitting diodes of the determined subset of light emitting diode groups; wherein for each n-bit data value, the collective intensity modulation for transmitting that data value is performed between non-data-transmission periods having longer durations than that of the collective intensity modulation, wherein the light emitting diodes are not modulated during the non-data-transmission periods, and wherein the emitted intensity of the plurality of light emitting diodes during the transmission of each data value is greater than or less than the emitted intensity of the plurality of light emitting diodes during non-data-transmission periods; and wherein the sequence of n-bit data values is transmitted independent of the respective color or wavelength emitted by the individual light emitting diodes. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for transmitting data by means of a collection of light emitting diodes, comprising the steps of:
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grouping the light emitting diodes of the collection into a plurality of groups; for each of a plurality of different n-bit data values, assigning a unique quantity of the light emitting diode groups to illuminate simultaneously to transmit that n-bit data value, such that the transmission of each different n-bit data value provides a different total level of illumination provided by the collection of the light emitting diodes; transmitting a sequence of n-bit data values by; for each respective n-bit data value; identifying the unique quantity of light emitting diode groups assigned to the respective n-bit data value; and transmitting the n-bit data value by collectively illuminating the identified quantity of light emitting diodes assigned to the respective n-bit data value, such that a total level of illumination provided by the collection of light emitting diodes is detectable by a receiver as corresponding to the respective n-bit data value; and wherein for each n-bit data value, the collective illumination for transmitting that data value is performed between non-data-transmission periods having longer durations than that of the collective illumination, wherein the light emitting diodes are not modulated during the non-data-transmission periods, and wherein the emitted intensity during the transmission of each data value is greater than or less than the emitted intensity during non-data-transmission periods.
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Specification