Free-Space Optical Communication Burst Error Reduction
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Solution Overview
Problem
Existing free-space optical communication techniques are insufficient in reducing burst errors caused by signal attenuation and loss due to natural phenomena such as atmospheric fluctuations and rain.
Innovation Solution
A free-space optical communication system that employs network coding, where a processor generates and sends first and second coded information, with the second packet being received after a predetermined time, allowing for effective restoration of attenuated or lost packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packet communication is used in free-space optical communication, then the system is simple to operate, but burst errors occur due to signal attenuation and loss from natural phenomena
Solution Approach 1:
The system performs preliminary actions by sending coded information packets that contain redundant data before the actual communication occurs. The communication control section generates coded information using network coding algorithms, preparing backup data in advance to compensate for potential signal loss during transmission through atmospheric channels.
Solution Approach 2:
The invention introduces coded information as an intermediary element between the original data packets and the received signal. This coded information acts as a mediator that carries redundant representations of the data, allowing the receiving end to reconstruct lost packets without requiring retransmission, thus improving reliability while managing complexity through systematic encoding.
2Reliability
If network coding is implemented to reduce burst errors, then communication reliability improves, but the processing complexity increases
Solution Approach 1:
The communication data is segmented into multiple packets, and network coding is applied to generate coded versions of these segments. The communication control section divides the original data stream into manageable packet units, applies encoding algorithms to each segment, and transmits them sequentially. This segmentation approach reduces burst error impact by isolating errors to specific segments while maintaining overall communication integrity.
Solution Approach 2:
The system changes the parameter of data representation by transforming original packets into coded information through network coding operations. This parameter transformation allows the receiving end to reconstruct lost packets by combining received coded packets, reducing burst errors while the processing complexity is managed through efficient encoding algorithms implemented in the communication control section.
3Reliability
If coded information is sent instead of original packets, then packet restoration capability improves, but information loss during transmission increases
Solution Approach 1:
The system creates copies of the original data in the form of coded information packets. These coded copies contain redundant representations of the original data that can be used to reconstruct lost packets. The communication control section generates these coded copies using network coding, allowing the receiving end to restore original packets even when some transmissions are attenuated or lost during free-space optical communication.
Data Source
AI summary
A free-space optical communication technique is provided for effectively reducing the occurrence of burst errors caused by the attenuation or loss of packets. A free-space optical communication apparatus includes a light sending and receiving section configured to send and receive communication light and a communication control section configured to control packet communication. The communication control section causes the light sending and receiving section to send either a given packet or first coded information, and then causes the light sending and receiving section to send second coded information which contains the given packet and a packet received by the light sending and receiving section at a point in time at which a first predetermined time elapses.