Integer frequency offset estimation for IEEE 802.15.4g SUN MR-OFDM PHY

Kim, Byounghak; Choi, Seong Soo

doi:10.1109/icspcs.2011.6140847

Cited by 5 publications

(3 citation statements)

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“…In [6], the authors used STF, which was made by a pseudo noise sequence, to estimate the integer frequency offset, whereas [7] proposed algorithms that used the LTF in the preamble to estimate the IFO by using the LTF format in advance, as show in Figure 2. They estimated the CFO accurately for each packet.…”

Section: Research On Mr-ofdm Compensationmentioning

confidence: 99%

“…With high mobility, IEEE 802.15.4g SUN MR-OFDM will be affected by CFO, especially the Doppler shift. In [6,7], the authors focused on the IFO estimation for IEEE 802.15.4g MR-OFDM, which ignored the effect and estimation of FFO. It uses only the preamble part to estimate and compensate the IFO in the entitled Physical Protocol Data Unit (PPDU) packet.…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Mitigation of the Mobility Effect for IEEE 802.15.4g SUN MR-OFDM

Nguyen

et al. 2019

Applied Sciences

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In order to develop wireless sensor networks, which are defined by the IEEE 802.15.4 specification, researchers are considering low-power wide-area networks (LPWAN) due to their advantages of being long range, low power, low cost, and highly mobile. The issue of mobility is covered in the IEEE 802.15.4g standard for supporting a smart utility network (SUN), which is mainly controlled by orthogonal frequency-division multiplexing (OFDM) modulation. In a high mobility scenario, inter-carrier interference is a primary factor in reducing the performance of OFDM transmissions due to the destruction of the subcarrier component's orthogonality. This paper analyzes the mobility effect in multi-rate multi-regional orthogonal frequency-division multiplexing (MR-OFDM) for low-power wide-area networks in general, and the SUN MR-OFDM system in particular. As mentioned in standard 802.15.4 2015, IEEE 802.15.4g MR-OFDM is one of the low-power wide-area (LPWA) technologies in which energy optimization problems are of first priority. We are especially interested in simple technologies that provide high efficiency. Therefore, we propose a highly adaptive method that uses the cyclic prefix to mitigate the mobility effect in real time. At a symbol frames interval of 120 us, the Doppler shift effect from the mobility of the MR-OFDM system adapted smoothly. This is not the best method to mitigate Doppler shift but it is a simple method that suits the LPWA network. The proposed scheme clearly simulated the mobility of the MR-OFDM system, and had the advantage of using a cyclic-prefix with a bit error rate performance through Additive White Gaussian Noise (AWGN) and the Rician channel of Matlab.

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Section: Research On Mr-ofdm Compensationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Real-Time Mitigation of the Mobility Effect for IEEE 802.15.4g SUN MR-OFDM

Nguyen

et al. 2019

Applied Sciences

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“…It is commonly normalized in relation to the subcarrier spacing and split into two components: the Fractional CFO (FCFO), corresponding to a shift in the spectrum smaller than the subcarrier spacing; and the Integer CFO (ICFO), which is equal to a multiple of the subcarrier spacing. The FCFO reduces signal amplitude and introduces Inter Carrier Interference (ICI), while ICFO causes a cyclic shift of subcarrier indices [7]. Generally, the FCFO is Ąrst estimated in the time domain by means of autocorrelation and then the ICFO is estimated in the frequency domain, while the complete CFO is compensated by a feedback chain.…”

Section: List Of Tablesmentioning

confidence: 99%

OFDM frame and frequency synchronization in IEEE 802.15.4g

Tamagno¹

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Agradeço sempre primeiramente a Deus pelo dom da vida e à minha família, por sempre estimular meus estudos, apoiar todas as minhas decisões, acreditar na minha capacidade e torcer pelo meu sucesso. Agradeço aos meus amigos que convivem comigo, por tornarem meus dias mais alegres e leves, o que alivia minha mente e a prepara todo dia para novos desaĄos. Agradeço ao Instituto de Pesquisa Eldorado, por me permitir desenvolver este trabalho com recursos da empresa, especialmente ao meu líder de projeto e coorientador Eduardo Lima, por estimular todo o time de desenvolvedores no seu desenvolvimento acadêmico em paralelo com as atividades proĄssionais. E, Ąnalmente, agradeço ao meu orientador Renato Lopes por acreditar nesta parceria e me orientar para eu concluir este trabalho nesta renomada Universidade.

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