Receiver Design for Time-Based Ranging with IEEE 802.11b Signals

Exel, Reinhard

doi:10.1155/2012/743625

Cited by 19 publications

(10 citation statements)

References 40 publications

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“…Advanced timestamping techniques have been proposed in the literature in order to obtain sub-nanosecond time synchronization over IEEE 802.11 [19], [20] and [21]. In [19], it is described an 802.11b implementation in FPGA with hardware timestamps and subsample timestamping precision.…”

Section: Background and Related Workmentioning

confidence: 99%

“…However, according to the experiments documented in [19], the performance of the system is highly deteriorated for time-variant channels, showing a synchronization error bigger than 20 ns. The receiver presented in [19] is improved in [20] and in [21] to combat the multipath propagation. The improvements proposed in [20] are mainly based on the use of frequency hopping in order to obtain timestamps considering several independent channels.…”

Section: Background and Related Workmentioning

confidence: 99%

“…The receiver presented in [19] is improved in [20] and in [21] to combat the multipath propagation. The improvements proposed in [20] are mainly based on the use of frequency hopping in order to obtain timestamps considering several independent channels. This is used to average the timestamping error introduced by the multipath propagation.…”

Section: Background and Related Workmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Timestamping Method for Subnanosecond Time Synchronization in IEEE 802.11 Over WLAN Standard Conditions

Seijo

López-Fernández

Bernhard

et al. 2020

IEEE Trans. Ind. Inf.

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The Time-Sensitive networks paradigm envisions the integration of Operation Technology and Information Technology in the same network. One of the requirements for building Time-Sensitive networks is sharing a global time along the network. This requirement is especially critical in wireless systems, where there are few robust methods to perform accurate time transfer. In this paper, the problem of time transfer over realistic wireless channels is studied and a time distribution scheme is proposed. The time distribution scheme has three components: Precision Time Protocol, a novel timestamping method (enhanced timestamps) and an algorithm to implement the enhanced timestamps. The performance of the proposed scheme has been evaluated in MATLAB using the IEEE 802.11n standard under several standard Wireless Local Area Network channel models. The results show that the system can reach subnanosecond time transfer accuracy under Non-Line-of-Sight and time-variant conditions, but its performance greatly depends on the Signal-to-Noise-Ratio and on the channel variation rate.

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Section: Background and Related Workmentioning

confidence: 99%

Section: Background and Related Workmentioning

confidence: 99%

Section: Background and Related Workmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Timestamping Method for Subnanosecond Time Synchronization in IEEE 802.11 Over WLAN Standard Conditions

Seijo

López-Fernández

Bernhard

et al. 2020

IEEE Trans. Ind. Inf.

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“…Authors in [8] have explained the SDR receiver design method. Design aspects of software radio receiver for Wi-Fi technology have been enumerated in [9]. In the research article presented in [10], Global Navigation Satellite System (GNSS) receiver and effect of timing jitter are discussed.…”

Section: Introductionmentioning

confidence: 99%

Universal Band Pass Sampling Algorithm for Integration of Multiple Wireless Technologies Using Software Defined Radio Platform

Budaraju¹,

Anjaneyulu²

2016

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Software Defined Radio (SDR) architecture allows us to integrate different mobile technologies using common hardware but with different software modules. To achieve this, we need to keep the signal in digital form for as much portion of the circuitry as possible, so that the implementation could be carried out by programmable digital processors. For this purpose, the incoming radio frequency (RF) signal is down converted to baseband spectrum using band pass sampling method. Research works carried out so far in this field have developed a few algorithms for band pass sampling. But, these algorithms are not much useful for most of the mobile communication systems and they use complex methodology for computing the sampling frequency values. In order to use the SDR platform to integrate all current wireless technologies, an efficient, cost effective and less complex algorithm that can be labelled as universal band pass sampling algorithm is developed in this paper for multiple mobile systems. This algorithm is based on a novel idea of inserting guard bands between the signals which reduces the design complexities of perfect ADC and sharp cut off filters. Using this algorithm, valid sampling frequency ranges and corresponding IF values are calculated for down converting RF signals. The algorithm is tested for six RF signals of different wireless technologies which are integrated and simultaneously down converted using SDR based front end receiver and thus the system multiplies the base station capacity by a factor of six. The simulation results are obtained and shown in this paper which proves that the algorithm developed works well for most of the wireless technologies.

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“…However, there are applications where the residual offset is a limiting factor, e. g., for synchronization of measurement devices or location-based services. For timebased wireless localization approaches, the base stations need to be synchronized with accuracies in the sub-nanosecond range as 1 ns causes a position error of at least 0.3 m [2], [3]. Consequently, mitigating asymmetry is an important aspect to improve or even enable such applications.…”

Section: Introductionmentioning

confidence: 99%

Out-of-band asymmetry removal for high accuracy clock synchronization in 100Base-TX

Bigler

Exel

2013

2013 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication (ISPCS) Proceed

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The IEEE 1588 standard enables accurate clock synchronization in a distributed network by synchronizing multiple slave clocks to one master. To reduce the synchronization offset, IEEE 1588 compensates for the propagation delay between master and slave by round-trip measurements and the assumption of known link asymmetries. Yet, the determination of the asymmetries is out of scope of the standard. Therefore, state-ofthe-art implementations often neglect the presence of asymmetry which leads to a clock offset between master and slaves.In this paper we propose an asymmetry determination method for 100Base-TX using out-of-band Chirp Spread Spectrum signaling. In contrast to the round-trip measurements by IEEE 1588 event messages, the proposed solution is able to measure each individual link delay and is therefore capable of resolving the asymmetry. The practical feasibility of the proposed solution is shown by an FPGA-based prototype solution, which reveals that our approach enables sub-nanosecond synchronization even over (asymmetric) CAT5 cabling.

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Receiver Design for Time-Based Ranging with IEEE 802.11b Signals

Cited by 19 publications

References 40 publications

Enhanced Timestamping Method for Subnanosecond Time Synchronization in IEEE 802.11 Over WLAN Standard Conditions

Enhanced Timestamping Method for Subnanosecond Time Synchronization in IEEE 802.11 Over WLAN Standard Conditions

Universal Band Pass Sampling Algorithm for Integration of Multiple Wireless Technologies Using Software Defined Radio Platform

Out-of-band asymmetry removal for high accuracy clock synchronization in 100Base-TX

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