A Receiver for Resource-Constrained Wireless Sensor Devices to Remove the Effect of Multipath Fading

Nguyen, Trang Tien; Oh, Hoon

doi:10.1109/tie.2017.2779423

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…The receiver receives a superposition of these multiple path signals, which is called the multipath effect [7]. In code division multiple access (CDMA) systems, the multipath effect reduces the signal‐to‐noise ratio (SNR) of the received signal, causing errors in signal sampling and increasing the bit error rate (BER) [8].…”

Section: Introductionmentioning

confidence: 99%

Design of spread spectrum communication system based on multipath signal synthesis

Xiaoxu,

Zhaobin,

Jiacheng

et al. 2023

Electronics Letters

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A low‐complexity anti‐multipath interference spread spectrum communication system is proposed to address shortcomings in traditional anti‐multipath technology, such as complex structures and high resource consumption. The system utilizes a fast Fourier transform to capture pseudo‐noise code signals and simultaneously detect multipath signals. Moreover, the signal‐to‐noise ratio (SNR) of each path signal is calculated, and the multipath signal is synthesized through the designed optimal SNR synthesis method to improve the SNR of the demodulated signal to reduce the bit error rate. MATLAB is used to perform functional simulations of the system to verify its feasibility. The simulation results show that the system can successfully detect and synthesize multipath signals and achieve lower communication error rates than traditional code division multiple access (CDMA) systems.

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Section: Introductionmentioning

confidence: 99%

Design of spread spectrum communication system based on multipath signal synthesis

Xiaoxu,

Zhaobin,

Jiacheng

et al. 2023

Electronics Letters

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“…However, the ideal coherent detection is not practical since it is not possible to get the exact phase shift value. Thus, a receiver employs the non-ideal coherent detection that estimates the phase shift by using a preamble [5]. In most cases, a receiver uses the non-coherent detection technique that demodulates signals based on the phase difference of two consecutive symbols.…”

Section: Introductionmentioning

confidence: 99%

An Efficient BPSK Modulation and Demodulation Scheme with the Complete Removal of Fading

Nguyen¹,

Ta²,

Oh³

2021

Preprint

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A novel non-coherent <i>BPSK</i> modulation and demodulation scheme is proposed to remove both slow and fast fading completely. We formulate a compound function that reflects the different characteristics of both slow and fast fading and prove that the scheme can remove fading from the function completely. The scheme is reified by a simple architecture that can remove slow and fast phase shifts completely from the received signals. It is shown by using analytical model and numerical data that the proposed scheme outperforms other ones significantly under the presence of both slow and fast fading. The analytical results also show that the proposed scheme can work well even with a small sampling rate, resulting in a wireless device with low energy consumption.

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“…LoRa is a new Internet of Things (IoT) network technology for long-range, low data rates and low power consumption [1][2][3][4]. LoRa has some advantages, such as long transmission range, low sensitivity, and resistance to multi-path fading [5], though it also has a disadvantage, namely, a low data rate. LoRa transceivers can transmit packets more than 10 km; however, in some special environments, it requires a multi-hop communication such as an underground tunnel.…”

Section: Introductionmentioning

confidence: 99%

Multi-Hop LoRa Network Protocol with Minimized Latency

Loc

Kim

2020

Energies

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LoRa (Long Range) is a long-range communications capacity with chirp spread spectrum modulation. It has been developed for Internet of Things (IoT) applications for long-distance and low power consumption. Some authors proposed LoRa protocols such as LoRaWAN, LoRaBlink, DQ-LoRa and the multi-hop LoRa network with linear topology; however, these protocols have disadvantages. In this paper, we propose a minimized latency multi-hop LoRa network protocol that is collision-free with low latency to improve on the disadvantages. First, in the proposed protocol, tree topology is constructed by exchanging packets between LoRa nodes and the sink node. During this period, a timeslot and channel are assigned to each tree link, over which LoRa nodes communicate with their parent node and which is collision-free with its neighbor nodes. After the tree construction period, LoRa nodes start data transmission using the timeslot and channel that they have already been assigned to in the tree construction period. We developed the proposed protocol in a LoRa node prototype using the MultiTech mDot module, and we conducted experiments at Ulsan University. The results show that the proposed protocol provides high reliability, parallel transmissions, a minimized number of timeslots assigned for all the links in the network, a minimized packet size, and low latency.

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A Receiver for Resource-Constrained Wireless Sensor Devices to Remove the Effect of Multipath Fading

Cited by 11 publications

References 17 publications

Design of spread spectrum communication system based on multipath signal synthesis

Design of spread spectrum communication system based on multipath signal synthesis

An Efficient BPSK Modulation and Demodulation Scheme with the Complete Removal of Fading

Multi-Hop LoRa Network Protocol with Minimized Latency

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