Abstract
Our previous works have clarified that exploiting uniquely decodable codes (UDC) can enhance the throughput of M-to-1 free space optical (FSO) systems due to the non-orthogonal property. Considering that multiple-input multiple-output (MIMO) technique can combat fading, this paper expands the original single-receiver case to the case of multiple receivers and establishes a UDC-MIMO-FSO system, aiming at combining the channel capacity gain of UDC with the diversity gain of MIMO. However, owing to the employed UDC codewords, it is discovered that the traditional maximal ratio combining (MRC) becomes no longer optimal. Two combination approaches are proposed in order to obtain better error performance, i.e. the suboptimal maximizing minimum distance combination (MMDC) and the optimal distance-based candidate selection (DBCS), which are verified to outperform traditional benchmarks by simulations. The complexities of the two proposed algorithms are also compared. In addition, we build a 2 × 2 equivalent experiment to further validate the feasibility of the UDC-MIMO-FSO architecture and the effectiveness of the proposed combination algorithms.
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