Method and apparatus for avoiding saturation in optical wireless point-to-point systems

Patent metadata

Field	Value
Publication number	US-12592771-B2
Application number	US-202218283277-A
Country	US
Kind code	B2
Filing date	Mar 15, 2022
Priority date	Mar 26, 2021
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

Abstract

An apparatus ( 200 ) in a point-to-point optical wireless communication system, the apparatus comprises an optical receiver ( 210 ) configured to receive a signal; a power detector ( 202 ) configured to detect a signal strength of the received signal; a digital baseband module ( 203 ) configured to demodulate the received signal and measure a data rate of the received signal; and a controller ( 204 ) configured to derive a gain setting adjustment according to a change of the measured data rate when the detected signal strength is above a certain threshold.

First claim

The invention claimed is:

1 . An apparatus in a point-to-point optical wireless communication system, the apparatus comprising:
an optical receiver configured to receive a signal; a power detector configured to detect a signal strength of the received signal; a digital baseband module configured to demodulate the received signal and measure a data rate of the received signal; and a controller configured to derive a gain setting adjustment according to a change of the measured data rate when the detected signal strength is above a certain threshold.

2 . The apparatus of claim 1 , wherein the controller is configured to derive a gain setting adjustment for a gain reduction when the detected signal strength is above the certain threshold and the measured data rate is reduced.

3 . The apparatus of claim 1 , wherein the optical receiver comprises a photodiode and a transimpedance amplifier, (TIA) configured to amplify an output of the photodiode, and the controller is configured to apply the gain setting adjustment to the TIA.

4 . The apparatus of claim 3 , wherein the power detector has a larger dynamic range than the TIA.

5 . The apparatus of claim 1 , wherein the controller is configured to provide the gain setting adjustment to an optical transmitter connected to the apparatus.

6 . The apparatus of claim 1 , wherein a peak-to-average power ratio, PAPR of the signal is at least 3 dB.

7 . The apparatus of claim 1 , wherein the signal is according to a spread spectrum modulation.

8 . The apparatus of claim 1 , wherein the signal is an orthogonal frequency-division multiplexing, (OFDM) signal.

9 . A point-to-point optical wireless communication system comprising:
an optical transmitting device configured to transmit a signal to a remote optical receiving device; and the remote optical receiving device comprising an apparatus of claim 1 .

10 . A point-to-point optical wireless communication system comprising:
a first optical transceiver device comprising a first apparatus of the apparatus of claim 5 and a first optical transmitter connected thereto; and a second optical transceiver device comprising a second apparatus of the apparatus of claim 5 and a second optical transmitter connected thereto; and wherein the first optical transceiver device is configured to transmit a first signal to the second optical transceiver device; and the second optical transceiver device configured to: receive the first signal; and apply a gain setting adjustment derived from the first signal to the second optical transmitter for transmitting another signal back to the first optical transceiver device.

11 . A method of an apparatus in a point-to-point optical wireless communication system, the method comprising the apparatus:
receiving a signal; detecting a signal strength of the received signal; demodulating the received signal and measuring a data rate of the received signal; and deriving a gain setting adjustment according to a change of the measured data rate when the detected signal strength is above a certain threshold.

12 . The method of claim 11 , the method comprising the apparatus:
deriving a gain setting adjustment for a gain reduction when the detected signal strength is above the certain threshold and the measured data rate is reduced.

13 . A non-transitory computer readable medium comprising instructions which, when the program instructions are executed by an apparatus causes the apparatus to execute the steps of the method claim 11 .

Assignees

• Signify Holding Bv

Inventors

• Rojas Calvente Francisco David
• Sumasta Pamungkas Prawisuda

Classifications

• H04B10/1143 Primary

  Bidirectional transmission · CPC title

• H04B10/0793 Primary

  Network aspects, e.g. central monitoring of transmission parameters · CPC title