M-PAM Joint Optimal Waveform Design for Multiuser VLC Systems Over ISI Channels
M-PAM Joint Optimal Waveform Design for Multiuser VLC Systems Over ISI Channels
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DOI：
10.1109/jlt.2018.2846187
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发表时间：
2018-08
影响因子：
4.7
通讯作者：
Jie Lian;M. Noshad;M. Brandt-Pearce
中科院分区：
文献类型：
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作者：
Jie Lian;M. Noshad;M. Brandt-Pearce
可见光通信是提供高速数据传输的一种候选技术。提出了一种支持多用户的可见光通信系统联合最优波形设计算法。对发射波形和最小均方误差滤波器进行了联合优化，使码间干扰和多址干扰最小化。根据不同的信道条件，设计的波形和调制星座大小可以自适应调整，以保证最高的比特率。本文还考虑了信道的不确定性。与光码分多址和光时分多址相比，该算法可以提供更高的比特率。此外，该算法可以通过改变优化约束来灵活调整光照水平。为了缩短优化计算时间，提出了一种离线波形设计算法。可以提前离线建立波形查找表，并根据实际信道增益实时从表中选择合适的波形。利用信道不确定性模型可以估计离线算法的性能。
Visible light communication is a candidate technique to provide high-speed data transmissions. This paper proposes a joint optimal waveform design algorithm for visible light communication systems using $M$-ary pulse amplitude modulation to support multiple users. Transmitted waveforms and minimum mean squared error filters are jointly optimized to minimize the intersymbol and multiple access interferences. Based on different channel conditions, the designed waveforms and modulation constellation sizes can be adaptively adjusted to guarantee the highest bit rates. Channel uncertainty is also considered in this paper. Compared with optical code division multiple access and time division multiple access, the algorithm proposed can provide higher bit rates. In addition, the proposed algorithm can flexibly adjust the illumination level by changing the optimization constraints. An offline waveform design algorithm is then proposed to diminish the optimization computation time. A waveform lookup table can be established offline in advance, and the proper waveforms can be selected from the table based on the actual channel gains in real time. The performance of the offline algorithm can be estimated by using the channel uncertainty model.