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In this paper, we propose a novel automatic gain control (AGC) algorithm, which is applicable to a commercially available chirp-spread-spectrum (CSS) device. Because of the property of long guard time in the CSS, it is difficult to make use of the conventional AGC algorithm which only uses one window size to estimate the power of signal. Due to using only one window size, there is a tradeoff between...
In this paper, we propose a novel automatic gain control (AGC) algorithm as a solution to improve the signal reception performance based on the IEEE 802.15.4a chirp spread spectrum (CSS) over indoor fading channels. The CSS signals are composed of low-band and high-band signals whose frequency characteristics are different because of multipath fading in indoor environment. It is not appropriate to...
In this paper, we propose a new robust packet detection and frequency offset compensation structure for IEEE 802.15.4a chirp spread spectrum (CSS) which is a standard for wireless personal area network (WPAN). The proposed structure takes benefits of both cross- and auto-correlation. Cross-correlation is useful to remove additional side band noise in the CSS system and to find sharp peaks among filtered...
In this paper, we proposed a new packet detection algorithm with high performance and low hardware complexity for chirp-spread-spectrum (CSS) in AWGN channel. There are two typical conventional packet detection algorithms. First, the conventional algorithm based on mixed-correlation (CABMC) has a good performance by using matched filter to remove unused band noise, but the algorithm has a high hardware...
In this paper, we propose a new dual-band filtering method for performance enhancement of the chirp spread spectrum (CSS) system in the IEEE 802.15.4a standard. The CSS signals are composed of low- and high-band signals which are alternatively transmitted in time. If we use only one conventional channel filter, the signal-to-noise ratio (SNR) performance in the receiver is degraded, because the low-...
In this paper, we propose a new packet detection algorithm for differentially bi-orthogonal chirp-spread-spectrum (DBO-CSS) over multiple piconets. Because of the band hopping property of the DBO-CSS, the conventional packet detection algorithms based on auto-correlation cannot avoid side band noise. And the conventional algorithms employed in DBO-CSS systems are not performed well over simultaneously...
In this paper, we propose a robust packet detection algorithm for the differentially bi-orthogonal chirp-spread-spectrum (DBO-CSS). The conventional packet detection algorithms based on auto-correlation cannot avoid side band noise because of the band hopping property of the DBO-CSS. If we, therefore, use the conventional packet detection algorithms in the DBO-CSS, the performance degradation of the...
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