Optical wireless communication system with multiple receivers
First Claim
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1. An optical wireless hub device comprising:
- an optical module including a plurality of optical receivers, each optical receiver configured to receive a unique optical wireless signal, the optical module being configured to distinguish each unique optical wireless signal at one of the optical receivers;
processor circuitry coupled to the plurality of optical receivers, the processor circuitry receiving electrical signals derived from the optical wireless signals; and
an interface unit coupled to the processor circuitry.
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Abstract
A cellular optical wireless network 10 includes multiple bi-directional point-to-point links between a central hub 12 and dispersed clients 14. When the hub 14 is limited in size, the receivers may be in close proximity to one another. In this case, the optical signal from two or more clients, which may have spread significantly in diameter due to angular spread in the transmitted light, may overlap spatially at the hub, causing interference and difficulty in separating the data. The present invention provides techniques to avoid such interference.
22 Citations
24 Claims
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1. An optical wireless hub device comprising:
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an optical module including a plurality of optical receivers, each optical receiver configured to receive a unique optical wireless signal, the optical module being configured to distinguish each unique optical wireless signal at one of the optical receivers;
processor circuitry coupled to the plurality of optical receivers, the processor circuitry receiving electrical signals derived from the optical wireless signals; and
an interface unit coupled to the processor circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19)
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15. An optical wireless communication device comprising:
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a first optical wireless receiver having a photodetector with a first field of view;
a second optical wireless receiver having a photodetector with a second field of view, the second field of view being at least five degrees out of line with the first field of view; and
processing circuitry coupled to the first and to the second optical wireless receivers, the processing circuitry receiving first data from a first remote source and second data from a second remote source, the first data being received through the first optical wireless receiver and the second data being received through the second optical receiver.
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20. A method of communicating with a optical wireless signal, the method comprising:
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receiving a first optical wireless signal from a first source;
receiving a second optical wireless signal from a second source; and
distinguishing between the first optical wireless signal and the second optical wireless signal. - View Dependent Claims (21, 22, 23, 24)
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Specification