Apparatus and method for improved connectivity in wireless optical communication systems
First Claim
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1. Apparatus for receiving an infrared signal, comprising:
- at least two receiving units, each comprising a converter which converts the received infrared signal to a digital signal, whereby the digital signals represent data carried in frames comprising at least a data field and a header field which contains a preamble being identical for each of said digital signals, and a selector for determining for at least part of each of the preambles a measure related to its signal-to-noise ratio and comparing the measures in order to select for further processing the one digital signal with the highest signal-to-noise ratio, wherein the digital signal of the preamble is oversampled and weighted in order to determine the measure related to the signal-to-noise ratio.
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Abstract
The present invention provides an apparatus and a method for improved connectivity in wireless optical networks. Therefore at least two or more receiving units are used which receive an infrared signal and convert it to a digital signal. The digital signals represent data in the form of frames whereby each frame comprises at least a data field and a header field containing a preamble. A selector determines a measure related to the signal-to-noise ratio of the preamble and compares the measures in order to select the best suited signal for further processing.
35 Citations
22 Claims
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1. Apparatus for receiving an infrared signal, comprising:
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at least two receiving units, each comprising a converter which converts the received infrared signal to a digital signal, whereby the digital signals represent data carried in frames comprising at least a data field and a header field which contains a preamble being identical for each of said digital signals, and a selector for determining for at least part of each of the preambles a measure related to its signal-to-noise ratio and comparing the measures in order to select for further processing the one digital signal with the highest signal-to-noise ratio, wherein the digital signal of the preamble is oversampled and weighted in order to determine the measure related to the signal-to-noise ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 20)
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9. Apparatus for receiving and transmitting an infrared signal, which comprises:
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at least two receiving units, each comprising a converter which converts the received infrared signal to a digital signal, whereby the digital signals represent data carried in frames comprising at least a data field and a header field which contains a preamble being identical for each of said digital signals, and a selector for determining for at least part of each of the preambles a measure related to its signal-to-noise ratio and comparing the measures in order to select for further processing the one digital signal with the highest signal-to-noise ratio, wherein the digital signal of the preamble is oversampled and weighted in order to determine the measure related to the signal-to-noise ratio, and at least one transmitting unit, coupled to the selector. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for receiving an infrared signal in a wireless optical communication system comprising the steps of:
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receiving the infrared signal by at least two receiving units, converting the infrared signal to a digital signal, whereby the digital signals represent data carried in frames comprising at least a data field and a header field which contains a preamble being identical for each of said digital signals, determining for at least part of each of the preambles a measure related to its signal-to-noise ratio and comparing the measures, wherein the digital signal of the preamble is oversampled and weighted in order to determine the measure related to the signal-to-noise ratio, and selecting the one digital signal with the highest signal-to-noise ratio for further data processing. - View Dependent Claims (18, 19)
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21. A method for receiving an infrared signal and transmitting an infrared signal comprising the steps of:
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receiving the infrared signal by at least two receiving units, converting the infrared signal to a digital signal, whereby the digital signals represent data carried in frames comprising at least a data field and a header field which contains a preamble being identical for each of said digital signals, determining for at least part of each of the preambles a measure related to its signal-to-noise ratio and comparing the measures, wherein the digital signal of the preamble is oversampled and weighted in order to determine the measure related to the signal-to-noise ratio, selecting the one digital signal with the highest signal-to-noise ratio for further data processing, and transmitting transmit-data in the opposite direction where the one digital signal with the highest signal-to-noise ratio is being received or in all directions. - View Dependent Claims (22)
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Specification