An Index-Modulated FSCM Systems with Low Complexity Algorithm and Enhanced Data Rate

IF 0.3 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC IEICE Communications Express Pub Date : 2024-02-16 DOI:10.23919/comex.2024XBL0011

Li Li;Zujun Liu;Yurong Guo

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Abstract

Frequency-Shift Chirp Modulation (FSCM) also known as LoRa modulation, enables long-distance transmission with low power consumption for Internet of Things (IOT), but has a limited transmission rate. Frequency-shift chirp spread spectrum system with index modulation (FSCSS_IM) introduces index modulation to improve the transmission rate of FSCM at the cost of high demodulation complexity. This letter propose an improved FSCSS_IM scheme to further improve the transmission rate of FSCM by adding indexes with equal values to the codebook. And then we design a low complexity demodulation algorithm which employs index matching to replace the index search matching algorithm in FSCSS_IM. Finally, we derive the approximate BER expression of the proposed scheme. The analysis and simulation results show that the transmission rate of the proposed scheme is up to 91.7% higher than that of the FSCM and 8.3% higher than that of the existing FSCSS_IM scheme, and the demodulation algorithm has the almost the same computational complexity as the FSCM and much lower than that of FSCSS_IM.

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具有低复杂度算法和更高数据速率的指数调制 FSCM 系统

频移啁啾调制（FSCM）又称 LoRa 调制，可实现物联网（IOT）的低功耗长距离传输，但传输速率有限。带索引调制的频移啁啾扩频系统（FSCSS_IM）引入了索引调制，以提高 FSCM 的传输速率，但代价是解调复杂度较高。本文提出了一种改进的 FSCSS_IM 方案，通过在编码本中添加等值索引，进一步提高 FSCM 的传输速率。然后，我们设计了一种采用索引匹配的低复杂度解调算法，以取代 FSCSS_IM 中的索引搜索匹配算法。最后，我们推导出了所提方案的近似误码率表达式。分析和仿真结果表明，所提方案的传输速率比 FSCM 高 91.7%，比现有的 FSCSS_IM 方案高 8.3%，解调算法的计算复杂度与 FSCM 几乎相同，比 FSCSS_IM 低得多。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEICE Communications Express ENGINEERING, ELECTRICAL & ELECTRONIC-

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33.30%

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114