Precise Power Delay Profiling with Commodity WiFi

Xie, Yaxiong; Li, Zhenjiang

doi:10.1145/2789168.2790124

Cited by 482 publications

(202 citation statements)

References 34 publications

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“…The Wi-Fi NIC is configured to report CSI value for every non-empty subcarrier, i.e., 56/114 subcarrier using 20/40MHz channels. Other information associated with the received packet, including the payload, RSSI, data rate and time-stamp, is recorded together with reported CSI [29] 2 . We have developed and released an open-source toolkit that works with Ubuntu system [30].…”

Section: Discussionmentioning

confidence: 99%

Augmenting wide-band 802.11 transmissions via unequal packet bit protection

Xie

et al. 2016

IEEE INFOCOM 2016 - The 35th Annual IEEE International Conference on Computer Communications

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Abstract-Due to frequency selective fading, modern wideband 802.11 transmissions have unevenly distributed bit BERs in a packet. In this paper, we propose to unequally protect packet bits according to their BERs. By doing so, we can best match the effective transmission rate of each bit to channel condition, and improve throughput. The major design challenge lies in deriving an accurate relationship between the frequency selective channel condition and the decoded packet bit BERs, all the way through the complex 802.11 PHY layer. Based on our study, we find that the decoding error of a packet bit corresponds to dense errors in the underlying codeword bits, and the BER can be truthfully approximated by the codeword bit error density. With above observation, we propose UnPKT, scheme that protects packet bits using different MAC-layer FEC redundancies based on bit-wise BER estimation to augment wide-band 802.11 transmissions. UnPKT is software-implementable and compatible with the existing 802.11 architecture. Extensive evaluations based on Atheros 9580 NICs and GNU-Radio platforms show the effectiveness of our design. UnPKT can achieve a significant goodput improvement over state-of-the-art approaches.

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Section: Discussionmentioning

confidence: 99%

Augmenting wide-band 802.11 transmissions via unequal packet bit protection

Xie

et al. 2016

IEEE INFOCOM 2016 - The 35th Annual IEEE International Conference on Computer Communications

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“…CSI-Based Detection. Many finer-grained CSI-based schemes have been implemented to realize better detection in recent years since we can extract CSI from commodity wireless NICs, that is, Intel 5300 [15] and Atheros [16]. Compared with RSS feature, CSI can be a more finedgrained signal feature, which characterizes the multipath effect at the granularity of the OFDM subcarrier in the frequency domain [23].…”

Section: Related Workmentioning

confidence: 99%

“…CSI contains both amplitude and phase measurements separately for each OFDM subcarrier, which reflects the varying multipath reflection caused by people's existence due to its significant frequency diversity. Compared with RSS, CSI provides fine-grained channel information in the physical layer, which can now be read from modified device drivers for several off-the-shelf WiFi network interface cards (NIC), such as the Intel WiFi Link 5300 NIC [15] and the Atheros AR9580 chipset [16]. Although some previous works make great progress with the physical layer CSI amplitude and phase information, few works use the more sensitive CSI phase difference.…”

Section: Introductionmentioning

confidence: 99%

A Robust Passive Intrusion Detection System with Commodity WiFi Devices

Ding

Zhao

et al. 2018

Journal of Sensors

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In recent years, due to the rapidly growing capacities of physical layer, device-free passive detection holds great importance for a broad range of application. Most recent works focus on motion detection, intrusion detection, and vital sign with commodity WiFi devices in the indoor environment. Conventional device-free motion detection techniques, which utilize received signal strength (RSS), may suffer from coarse granularity and high variability problems. In resorting to the finer-grained channel state information (CSI), we propose PhaseMode, a novel approach for device-free motion detection leveraging CSI phase difference data between adjacent antenna pairs. We implement our approach on commercial WiFi devices and validate its performance. We conduct experiments in different test periods of three indoor environments; the results show that the proposed scheme achieves an average accuracy over 99.4% of motion detection in different scenarios.

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“…CSI can work with either range measurement or fingerprinting technique. However, compared with RSS that is easy to be obtained in most mobile devices by calling the API of the operating system, CSI is not available in most mobile device platforms such as Android and iOS, and more importantly, CSI brings high computation complexity [15].…”

Section: A Technologies and Performancementioning

confidence: 99%

MapSense: Mitigating Inconsistent WiFi Signals Using Signal Patterns and Pathway Map for Indoor Positioning

Yang

Zhou

2018

IEEE Internet Things J.

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Abstract-The indoor positioning technology plays a significant role in the scenarios of the Internet of Things (IoT) which require indoor location context. In this paper, the WiFi signals under modern enterprise WiFi infrastructure, signal patterns between coexisting access points (APs) and signals' correlation with indoor pathway map are investigated to address the problem of inconsistent WiFi signal observations. The sibling signal patterns (SSP) are defined for the first time and processed to generate Beacon APs which have higher confidence in positioning. The spatial signal patterns are used to bring the estimated location into a limited area through signal coverage constraint (SCC). A positioning scheme using SSP and SCC is proposed and shows improved positioning accuracy. The proposed scheme is fully designed, implemented and evaluated in a real-world environment, revealing its effectiveness and efficiency.

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Precise Power Delay Profiling with Commodity WiFi

Cited by 482 publications

References 34 publications

Augmenting wide-band 802.11 transmissions via unequal packet bit protection

Augmenting wide-band 802.11 transmissions via unequal packet bit protection

A Robust Passive Intrusion Detection System with Commodity WiFi Devices

MapSense: Mitigating Inconsistent WiFi Signals Using Signal Patterns and Pathway Map for Indoor Positioning

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