A Novel Encoding Scheme for Improving the Bandwidth Efficiency of DPPM
A Novel Encoding Scheme for Improving the Bandwidth Efficiency of DPPM
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DOI：
10.1109/icc42927.2021.9500673
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
M. Islam;M. Younis;M. Mahmud;J. B. Saif
中科院分区：
文献类型：
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作者：
M. Islam;M. Younis;M. Mahmud;J. B. Saif
差分脉冲位置调制（DPPM）是一种用于支持水下环境和跨空气-水界面的可见光通信的流行的功率有效方案。尽管有这样的优点，DPPM不能有效地利用可用的信道容量。本文希望通过在功率和带宽效率之间取得更好的平衡来解决这些缺点。特别地，考虑L-DPPM，其中M个输入数据比特的块被映射到仅包含一个“片上”的L个不同波形中的一个。提出了一种新的编码算法和帧结构，以缩短连续符号之间的时间，从而提高L-DPPM的比特率。这个想法是基于避免位模式，有助于最大的带宽效率低下。该算法通过简单的求补和移位操作实现了大量的位模式重映射。提供了具有所有必要控制位的详细帧结构。总的来说，提高带宽效率是以控制比特数和传输功率的略微增加为代价的。仿真结果证明了所提出的编码算法的有效性，并提供了指导方针，以确定最佳性能的M。
The differential pulse position modulation (DPPM) is one of the popular power-efficient schemes for supporting visible light communication in underwater environments and across the air-water interface. Despite such an advantage, DPPM does not efficiently utilize the available channel capacity. This paper aspires to tackle such shortcomings by striking a better balance between power and bandwidth efficiency. Particularly, L-DPPM is considered where a block of M input data bits is mapped into one of the L distinct waveforms containing only one ‘on’ chip. A novel encoding algorithm and frame structure are proposed in order to shorten the time between consecutive symbols and consequently improve the bit rate of L-DPPM. The idea is based on avoiding bit patterns that contribute the most to bandwidth inefficiency. The proposed algorithm explores a number of bit patterns remapping through simple complement and shifting operations. A detailed frame structure with all necessary control bits is provided. Overall, boosting the bandwidth efficacy comes at the expense of a slight increase in control bit count and transmission power. The simulation results demonstrate the effectiveness of the proposed encoding algorithm and provide guidelines for determining M for best performance.