Cross-correlation between 900 MHz signals received on vertically separated antennas in small-cell mobile radio systems

Feeney, M.T.; Parsons, J.D.

doi:10.1049/ip-i-2.1991.0011

Cited by 14 publications

(4 citation statements)

References 1 publication

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“…In the literature, the most common reference to diversity performance is in terms of the envelope correlation although all three measurements of correlation are related. It is a widely held assumption that in a Rayleigh fading environment [11], [12] although negative values of have been observed [13]. Both experimentally and analytically, it has been shown that for all practical purposes [11], [13].…”

Section: A Correlation Coefficientsmentioning

confidence: 99%

Evaluation of personal communications dual-antenna handset diversity performance

Colburn

Rahmat‐Samii

Jensen

et al. 1998

IEEE Trans. Veh. Technol.

100

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In personal wireless communications systems, multipath propagation has a significant effect on system design and performance. Signal strength fading caused by destructive interference between multiple replicas of the signal of interest arriving at the receiver over different paths often is the limiting factor in system range/fidelity. Antenna diversity is one technique that can be used to help overcome multipath fading. This paper presents a description of experiments, data processing, and results used to evaluate the diversity performance of three candidate dual-antenna handset configurations: two side-mounted planarinverted F antennas (PIFA's), a back-mounted PIFA with a top-mounted helix, a top-mounted PIFA, and a "flip" monopole. In particular, the indoor industrial, scientific, and medical (ISM) band (902-928 MHz) propagation channel was of interest. These experiments did not include operator proximity effects, and in these tests, the dual-antenna handset remained stationary while the transmitter was moved along predetermined indoor paths. The issue of data normalization for extraction of fast fading behavior from measured data will be addressed, with results showing its effect on observed correlation presented. Also, measured indoor fading distributions are presented and seen to fit the Rician and Rayleigh models well. From the diversity results presented, it is seen that the three proposed dual-antenna handsets yield sufficient decorrelation to warrant consideration for use in diversity systems. Index Terms-Antenna diversity, correlation coefficient, handset antennas, multipath fading. Michael A. Jensen (S'93-M'95) received the B.S. (summa cum laude) and M.S. degrees in electrical engineering from Brigham Young University

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Section: A Correlation Coefficientsmentioning

confidence: 99%

Evaluation of personal communications dual-antenna handset diversity performance

Colburn

Rahmat‐Samii

Jensen

et al. 1998

IEEE Trans. Veh. Technol.

100

View full text Add to dashboard Cite

show abstract

“…To give an insight on the relationship between distance and channel correlation, the channel correlation in a typical indoors office environment is higher than 0.5 when the two receivers are positioned in less than a couple of wavelengths apart (e.g., 10-20cm apart when the operating frequency is 2.4GHz) [19]. In outdoors environments, the channels tend to correlate over longer distances [18], [20].…”

Section: Chrysp a Channel Correlationmentioning

confidence: 99%

Physical Layer Protection Against Relay/Replay Attacks for Short-Range Systems

Paschou

Johnson

Zhu

et al. 2023

2023 IEEE Wireless Communications and Networking Conference (WCNC)

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In response to the rise of crime in shortrange communication systems, a novel method for authenticating co-located devices is presented. Our method, Channel Randomness Yields Secure Proximity (ChRYSP) exploits the fundamental properties of the wireless RF channel to protect against relay attacks and replay attacks -the two most common impersonation attacks in short-range communication systems. ChRYSP is based on the fact that two devices in close proximity -typically a couple of wavelengthsexperience correlated fading on a received RF signal. ChRYSP is facilitated by the employment of a helper node and can be implemented by low-cost, narrowband transceivers. Numerical results demonstrate high accuracy in detecting both relay attacks and replay attacks.

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“…1 For cases when the reader can only measure the amplitude of the channel coefficient, the square of the spatial channel correlation, R 2 , can be approximated by the envelope cross-correlation [8], [11] defined as…”

Section: Evaluating the Spatial Correlation A Approximationmentioning

confidence: 99%

A Lightweight Protocol for Validating Proximity in UHF RFID Systems

Paschou

Johnson

Zhu

et al. 2021

2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall)

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We present a novel scheme for testing the proximity of an Ultra-high frequency (UHF) Radio Frequency Identification (RFID) transponder, based on the fact that two co-located devices experience correlated channel fluctuations on a reference signal. When the interrogator requests data from the transponder, the latter performs backscattering modulation on the carrier-wave provided by a helper node. The interrogator applies signal processing techniques on the backscattered signal to extract the channel characteristics of the channel between itself and the helper, and the channel between the transponder and the helper. If the two channels are correlated, then the proximity of the transponder is validated by the fundamental properties of spatial channel correlation. The proposed scheme can be employed seamlessly in RFID systems from the transponder's point of view and is resilient to distance-fraud attack.

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Cross-correlation between 900 MHz signals received on vertically separated antennas in small-cell mobile radio systems

Cited by 14 publications

References 1 publication

Evaluation of personal communications dual-antenna handset diversity performance

Evaluation of personal communications dual-antenna handset diversity performance

Physical Layer Protection Against Relay/Replay Attacks for Short-Range Systems

A Lightweight Protocol for Validating Proximity in UHF RFID Systems

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