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https://hdl.handle.net/10216/137358| Author(s): | Tiago Gonçalves Marques da Cunha |
| Title: | Constellation shaping in high-speed optical fiber communications |
| Issue Date: | 2021-10-08 |
| Abstract: | The use of Probabilistic Constellation Shaping is investigated in this work combined with ASK modulation with a distribution matcher, causing a non equal symbol probability. For the Distribution Matcher a Constant Composition Distribution Matcher is used. Channel adaptation is achieved by using several error correcting codes with different code rates and by changing the symbol probability in the transmitter. In the receiver, the Belief Propagation Algorithm is used with LDPC codes from DVB-S2 with code rates (3/4,4/5,5/6,8/9,9/10). Two different channels are simulated, one dominated exclusively by white Gaussian noise and the other by a channel simulated fiber optics in MATLAB. The system is analysed at a BER < 10−4. |
| Description: | O uso de Constellation Shaping é investigado no âmbito de transmissão de dados. Um sistema ASK é combinado com um distribution matcher para o envio não uniforme de símbolos. Usa-se o algoritmo Constant Composition Distribution Matcher como distribution matcher. A adaptação às condições de canal é feita através da variação da code rate usada e no caso de ASK não uniforme, é alterada a probabilidade de envio de cada símbolo no transmissor. No receptor é usado o algoritmo de Belief Propagation com códigos LDPC da tecnologia DVB-S2. Os códigos usados foram (3/4,4/5,5/6,8/9,9/10) LDPC DVB-S2. O algoritmo Probabilistic Shaping foi simulado em ambiente MATLAB usando dois canais, um dominado por ruído Gaussiano branco e o segundo trata da transmissão em fibra óptica. O sistema é analisado para uma BER de 10−4. |
| Subject: | Engenharia electrotécnica, electrónica e informática Electrical engineering, Electronic engineering, Information engineering |
| Scientific areas: | Ciências da engenharia e tecnologias::Engenharia electrotécnica, electrónica e informática Engineering and technology::Electrical engineering, Electronic engineering, Information engineering |
| DOI: | 10.34626/n4cv-es51 |
| TID identifier: | 202825990 |
| URI: | https://hdl.handle.net/10216/137358 |
| Document Type: | Dissertação |
| Rights: | openAccess |
| Appears in Collections: | FEUP - Dissertação |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 512301.pdf | Constellation shaping in high-speed optical fiber communications | 998.74 kB | Adobe PDF |  View/Open |
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