Modulation Precoding for MISO Visible Light Communications
Modulation Precoding for MISO Visible Light Communications
复制标题
MISO 可见光通信的调制预编码
DOI：
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发表时间：
2021
影响因子：
4.7
通讯作者：
M. Biagi
中科院分区：
文献类型：
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作者：
Andrea Petroni;G. Scarano;R. Cusani;M. Biagi
室内可见光通信被认为是一种可行的智能解决方案，通过方便地调制发光二极管产生的光信号来提供照明和无线连接。当处理多个独立信号源时，通信可靠性与分离信号的能力有关。这样的任务的完成变得非常具有挑战性，特别是在多输入单输出场景中，其中空间均衡的有效性受到装备接收机的唯一光电检测器的存在的限制，并且信道空间相关性可能严重影响通信性能。在这方面，我们提出了一种调制预编码方案，允许接收到的符号之间的最小距离被最大化下明确的照明约束，从而同时解决通信和照明的VLC系统所要求的问题。采用这种方法，可取得双重结果。通过对LED进行自适应功率分配，实现了空间预滤波，抵消了信道空间相关性引起的同信道干扰。此外，执行星座优化，使得即使在强干扰情况下，符号错误概率也保持在10 ^{-3}$以下。
Indoor Visible Light Communication is recognized as a viable and smart solution to provide both illumination and wireless connectivity by conveniently modulating optical signals generated by Light Emitting Diodes. When dealing with multiple independent sources, the communication reliability is tied to the capability of separating signals. The accomplishment of such task becomes very challenging especially in Multiple-Input Single-Output scenarios where the effectiveness of spatial equalization is limited by the presence of a unique photodetector equipping the receiver, and channels spatial correlation may severely impact on the communication performance. In this regard, we propose a modulation precoding scheme that allows the minimum distance between received symbols to be maximized under explicit lighting constraints, thus simultaneously addressing communication and illumination issues as demanded by VLC systems. Following this approach, a twofold result is achieved. By operating adaptive power allocation on LEDs, we realize a spatial pre-filtering that counterbalances the co-channel interference caused by channels spatial correlation. Furthermore, constellation optimization is performed so that the symbol error probability is kept below $10^{-3}$ even in strong interference scenarios.