Abstract
In this paper, we propose a novel pilot-aided phase and channel estimation algorithm for coherent mode-division multiplexing multiple-input multiple-output free-space optical communication system. This algorithm enables the implementation of advanced multiple-input multiple-output decoders, leading to a significantly better bit error rate performance. This algorithm also supports phase-asynchronous light sources at each transmit and receive channel, significantly reducing the hardware requirements. Moreover, it has low computational complexity and Cramér-Rao lower bound approaching estimation performance. In our proof-of-concept experiment, we employed 10 decorrelated channels to achieve a record-high 689.2 Gbit/s/wavelength line rate in strong turbulence, verifying the feasibility of our phase and channel estimation algorithm.
| Original language | English |
|---|---|
| Number of pages | 12 |
| Journal | Journal of Lightwave Technology |
| DOIs | |
| Publication status | E-pub ahead of print - 11 Mar 2024 |
Bibliographical note
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- Channel estimation
- Decoding
- Estimation
- Free-space optics
- MIMO communication
- Phase noise
- Symbols
- Vectors
- atmospheric turbulence
- channel estimation
- multiple-input multiple-output