Performance Analysis of an Overlap-Based CSS System

Yoon, Taeung; Ann, Sangjoon; Kim, Sun Yong; Yoon, Seokho

doi:10.1109/icact.2008.4493793

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…An IEEE 802. 15 Table II. In the table, the contribution due to periodic traffic, i.e., the beacons, is considered separately from the asynchronous packets.…”

Section: A Characterization Of Wireless Impairmentsmentioning

confidence: 98%

Timestamp Validation Strategy for Wireless Sensor Networks Based on IEEE 802.15.4 CSS

Ferrari

Giorgi

Narduzzi

et al. 2014

IEEE Trans. Instrum. Meas.

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Network time distribution relies on timestamping, which is employed by local nodes to assign a time value to incoming timing packets. Clearly, any error affecting the timestamp has a direct impact on the final synchronization accuracy of the system. In wireless sensor networks (WSNs), impairments affecting the wireless physical layer are the primary cause of such timestamping errors, and it would be advantageous to flag suspect timestamp values before feeding them into a synchronization algorithm. This paper discusses a new strategy for validating timestamps in a WSN based on IEEE 802.15.4 chirp spread spectrum. The considered system employs physical-level timestamping, which generates one timestamp for each symbol belonging to a packet. Such set of timestamps is processed using a Kalman filter (KF) that compares them with predicted values, employing statistical thresholds referred to the KF innovation process. Experimental results obtained over a long observation period shows that even in a noisy environment with several interfering communication sources, the algorithm is able to detect untrusted timestamps

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“…An IEEE 802. 15 Table II. In the table, the contribution due to periodic traffic, i.e., the beacons, is considered separately from the asynchronous packets.…”

Section: A Characterization Of Wireless Impairmentsmentioning

confidence: 98%

Timestamp Validation Strategy for Wireless Sensor Networks Based on IEEE 802.15.4 CSS

Ferrari

Giorgi

Narduzzi

et al. 2014

IEEE Trans. Instrum. Meas.

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“…Thus, the information can be carried in the signal phase requiring a carrier recovering system. Robustness of CSS against interferences is described in [11,12], while in [13] some considerations about the effect of frequency offset and timing error are resumed. A pictorial representation of both BOK and DM is furnished in Fig.…”

Section: B Exploiting Css For Data Communicationmentioning

confidence: 99%

Wireless sensors exploiting IEEE802.15.4a for precise timestamping

Dominicis

Ferrari

Flammini

et al. 2010

2010 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication

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This paper deals with the application of the Chirp Spread Spectrum (CSS) modulation for the synchronization of wireless sensors. Chirp modulation is a well known technique for precise localization, originally developed for RADAR applications. When CSS is used for communication purposes, radio frequency pulses are modulated in order to convey also user data. This approach allows for robustness, thanks to processing gain deriving from pulse compression, and for high accuracy estimation of the Time of Arrival of frames. In this paper, the CSS properties have been exploited in order to arrange a robust timestamping mechanism for distributed wireless sensor networks. The proposed system is based on the CSS modulation of the IEEE802.15.4a. Since commercial transceivers do not have synchronization support, the paper is based on a CSS modulation module implemented using a software defined radio approach. The outcome is a highly flexible solution that offers the desired synchronization support, confirmed by the simulation results showing a packet timestamping capability well below one nanosecond.

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Underwater acoustic communications using M-ary chirp-DPSK modulation

Ran

Meng

et al. 2010

IEEE 10th INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING PROCEEDINGS

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Performance Analysis of an Overlap-Based CSS System

Cited by 9 publications

References 2 publications

Timestamp Validation Strategy for Wireless Sensor Networks Based on IEEE 802.15.4 CSS

Timestamp Validation Strategy for Wireless Sensor Networks Based on IEEE 802.15.4 CSS

Wireless sensors exploiting IEEE802.15.4a for precise timestamping

Underwater acoustic communications using M-ary chirp-DPSK modulation

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