Correlation-Based Optimal Chirp Rate Allocation for Chirp Spread Spectrum Using Multiple Linear Chirps

Kwang-Yul KIM  Seung-Woo LEE  Yu-Min HWANG  Jae-Seang LEE  Yong-Sin KIM  Jin-Young KIM  Yoan SHIN  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A   No.4   pp.1088-1091
Publication Date: 2017/04/01
Online ISSN: 1745-1337
Type of Manuscript: LETTER
Category: Spread Spectrum Technologies and Applications
Keyword: 
chirp spread spectrum,  cross-correlation coefficient,  chirp rate allocation,  multiple linear chirp,  bandwidth separation,  

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Summary: 
A chirp spread spectrum (CSS) system uses a chirp signal which changes the instantaneous frequency according to time for spreading a transmission bandwidth. In the CSS system, the transmission performance can be simply improved by increasing the time-bandwidth product which is known as the processing gain. However, increasing the transmission bandwidth is limited because of the spectrum regulation. In this letter, we propose a correlation-based chirp rate allocation method to improve the transmission performance by analyzing the cross-correlation coefficient in the same time-bandwidth product. In order to analyze the transmission performance of the proposed method, we analytically derive the cross-correlation coefficient according to the time-bandwidth separation product and simulate the transmission performance. The simulation results show that the proposed method can analytically allocate the optimal chirp rate and improve the transmission performance.