Polarization diversity improves RSSI based location estimation for wireless sensor networks

Chethan, K. P.; Chakravarty, Tapas; Prabha, J.; Chandra, M. Girish; Balamuralidhar, P.

doi:10.1109/aemc.2009.5430601

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Chethan at al. [15] presented similar line-of-sight (LOS) measurements with antenna height of 1.2m. These are also measured in narrow, confined office space.…”

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 68%

“…Comparing the results presented in [15,16], we also estimate the possible implications of antenna height on received signal strength. At lower heights [16], the RSSI measurements are less than free-space prediction by 16-30dB; whereas at moderate heights [15] such difference is 8 -12dB. Measurements were carried out to investigate (a) the effect of relative orientation between the two Smartphones (Tx & Rx) carried by two persons (b) signal strength variations with finer granularity.…”

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 85%

“…If results of [3,10,14,15,16] are closely observed, for close distances (< 5m) between transmitter and receiver, the path loss profile in dB displays "hidden" spatial periodicity, on which random variations (in signal strength) are superimposed. Authors in [16] have presented simulation (2-D ray tracing model) based results at 2400MHz.…”

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 98%

“…These are also measured in narrow, confined office space. Moreover, [15] demonstrates that if RSSI measurements taken for multiple polarizations are combined, it leads to a much improved propagation model. Comparing the results presented in [15,16], we also estimate the possible implications of antenna height on received signal strength.…”

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 99%

“…Moreover, [15] demonstrates that if RSSI measurements taken for multiple polarizations are combined, it leads to a much improved propagation model. Comparing the results presented in [15,16], we also estimate the possible implications of antenna height on received signal strength. At lower heights [16], the RSSI measurements are less than free-space prediction by 16-30dB; whereas at moderate heights [15] such difference is 8 -12dB.…”

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 99%

See 4 more Smart Citations

BlueEye

Ghose

Bhaumik

Chakravarty

2013

Proceedings of the 2013 ACM Conference on Pervasive and Ubiquitous Computing Adjunct Publication

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Interesting applications of crowdsensing include measurement of crowdedness at public places and evaluating the extent of social interactions between people, at large gatherings. These require enabling the accurate estimation of proximity between two or more people. Since mobile phones have emerged as the most ubiquitous sensing and computing platform, carried by almost all people close to their body, it is logical to use the same for proximity detection. Further, in order to motivate people to use such application, it is necessary to estimate distances accurately, using only short blocks of sampled signal strengths. In this paper the authors present a mobile based proximity detection system, codenamed BlueEye which is based on Bluetooth. To achieve better distance estimates, BlueEye proposes a new form of path loss model which takes into account the relative orientation of mobile phones. The results show enhanced distance estimates when the separation between devices is less than 8 feet.Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored.Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from permissions@acm.org

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“…Chethan at al. [15] presented similar line-of-sight (LOS) measurements with antenna height of 1.2m. These are also measured in narrow, confined office space.…”

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 68%

Section: The Modified Wireless Path-loss Modelmentioning

confidence: 85%