BA&amp;#8211;POC-Based Ranging Method With Multipath Mitigation

Zhang, Z.; Law, Choi Look; Guan, Yong Liang

doi:10.1109/lawp.2005.862066

Cited by 18 publications

(11 citation statements)

References 8 publications

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“…for the functions g(·) involved in the derivation of the EFIM (see Appendix D), 14 we can gain insight into the structure of the EFIM as shown by the following corollary. Corollary 1: When the a priori distribution of the agents' positions satisfies (16), and the channel parameters corresponding to different waveforms are mutually independent, the EFIM for the agents' positions is a 2N a × 2N a matrix, structured as (17) shown at the bottom of the page, wherē J A e (p k ) andC kj can be expressed in terms of the RI:…”

Section: Fisher Information Analysis With a Priori Position Knowledgementioning

confidence: 99%

See 1 more Smart Citation

Fundamental Limits of Wideband Localization— Part II: Cooperative Networks

Shen

Wymeersch

Win

2010

IEEE Trans. Inform. Theory

735

277

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Abstract-The availability of positional information is of great importance in many commercial, governmental, and military applications. Localization is commonly accomplished through the use of radio communication between mobile devices (agents) and fixed infrastructure (anchors). However, precise determination of agent positions is a challenging task, especially in harsh environments due to radio blockage or limited anchor deployment. In these situations, cooperation among agents can significantly improve localization accuracy and reduce localization outage probabilities. A general framework of analyzing the fundamental limits of wideband localization has been developed in Part I of the paper. Here, we build on this framework and establish the fundamental limits of wideband cooperative location-aware networks. Our analysis is based on the waveforms received at the nodes, in conjunction with Fisher information inequality. We provide a geometrical interpretation of equivalent Fisher information for cooperative networks. This approach allows us to succinctly derive fundamental performance limits and their scaling behaviors, and to treat anchors and agents in a unified way from the perspective of localization accuracy. Our results yield important insights into how and when cooperation is beneficial.Index Terms-Cooperative localization, Cramér-Rao bound (CRB), equivalent Fisher information (EFI), information inequality, ranging information (RI), squared position error bound (SPEB).

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Section: Fisher Information Analysis With a Priori Position Knowledgementioning

confidence: 99%

“…Other aspects of UWB technology can be found in[19]-[25] 2. Commonly used signal metrics include time-of-arrival (TOA)[7],[8],[15],[17],[32], time-difference-of-arrival (TDOA)[33],[34], angle-of-arrival (AOA)[7],[35], and received signal strength (RSS)[7],[36],[37].…”

mentioning

confidence: 99%

Fundamental Limits of Wideband Localization— Part II: Cooperative Networks

Shen

Wymeersch

Win

2010

IEEE Trans. Inform. Theory

735

277

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“…5 shows the ToA detection outputs of the conventional correlator [4], POC [5], APOC [6], and the proposed kurtosis-based MPOC. BAPOC [7] is not suitable for UWB ranging and is not investigated because the binarization operation in BAPOC introduces severe pulse shape distortion and hence highly erratic impact on the correlator output. Fig.…”

Section: Ranging Performancementioning

confidence: 99%

“…As a result of its flattened spectrum, the POC output is impulselike, with the correlation peak much narrower than that of the conventional correlator. In [6] and [7], two variants of the POC called Asymmetric Phase-Only Correlator (APOC) and Binary APOC (BAPOC) were shown to be beneficial for indoor positioning using narrowband signals processed at baseband. However, the performance of the above correlators has not been examined for multi-target ranging based on IR-UWB signals which are bandpass in nature.…”

Section: Introductionmentioning

confidence: 99%

Modified Phase-Only Correlator with Kurtosis-Based Amplified-Noise Suppression

Zhou

Guan

Law

2010

IEEE Trans. Wireless Commun.

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In this paper, a Modified Phase-Only Correlator (MPOC) is proposed for resolving overlapped Ultra Wideband (UWB) radio pulses in order to achieve high-resolution multitarget UWB ranging. A Phase-Only Correlator (POC) is able to deconvolve the multi-target UWB channel from the received signal spectrum and its impulse-like output enables it to resolve UWB signals that are overlapping. However, the deconvolved channel is often corrupted by amplified noise arising from spectral nulls in the local template. To mitigate this problem, a MPOC which consists of a POC followed by a kurtosis-based noise suppression module is developed to suppress the amplified noise while maintaining the sharpness of the MPOC output. This enables the MPOC to achieve Time-of-Arrival (ToA) resolution much smaller than the UWB pulse duration. The excellent ToA detection performance of the proposed MPOC is verified by experimental measurement.

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“…This implies that the secret key generated based on distance will have a high bit mismatch rate (BMR), which is the ratio of the bits that do not match at the two nodes as extracted from the estimated distance. There are other techniques to perform localization which are based on the time of arrival (TOA) [17]- [20]. Although localization based on TOA has a higher accuracy than RSS based, it requires a clock synchronization between the two nodes [21].…”

Section: Introductionmentioning

confidence: 99%

Secret Key Generation Based on AoA Estimation for Low SNR Conditions

Badawy

Khattab

Elfouly

et al. 2015

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

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In the context of physical layer security, a physical layer characteristic is used as a common source of randomness to generate the secret key. Therefore an accurate estimation of this characteristic is the core for reliable secret key generation. Estimation of almost all the existing physical layer characteristic suffer dramatically at low signal to noise (SNR) levels. In this paper, we propose a novel secret key generation algorithm that is based on the estimated angle of arrival (AoA) between the two legitimate nodes. Our algorithm has an outstanding performance at very low SNR levels. Our algorithm can exploit either the Azimuth AoA to generate the secret key or both the Azimuth and Elevation angles to generate the secret key. Exploiting a second common source of randomness adds an extra degree of freedom to the performance of our algorithm. We compare the performance of our algorithm to the algorithm that uses the most commonly used characteristics of the physical layer which are channel amplitude and phase. We show that our algorithm has a very low bit mismatch rate (BMR) at very low SNR when both channel amplitude and phase based algorithm fail to achieve an acceptable BMR.

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BA–POC-Based Ranging Method With Multipath Mitigation

Cited by 18 publications

References 8 publications

Fundamental Limits of Wideband Localization— Part II: Cooperative Networks

Fundamental Limits of Wideband Localization— Part II: Cooperative Networks

Modified Phase-Only Correlator with Kurtosis-Based Amplified-Noise Suppression

Secret Key Generation Based on AoA Estimation for Low SNR Conditions

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