Robust 60 GHz Indoor Connectivity: Is It Possible with Reflections?

Genc, Zulkuf; Rizvi, U.H.; Onur, Ertan; Niemegeers, Ignas

doi:10.1109/vetecs.2010.5493722

Cited by 54 publications

(36 citation statements)

References 10 publications

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“…In indoor environments, presence of furniture, walls and humans can greatly affect the 60 GHz links. The loss due to human shadowing is around 20-30 dB [13]. To solve this issue, intelligent beamforming antennas are needed which can select alternative non line of sight (NLOS) paths, in case the LOS path is obstructed.…”

Section: Challengesmentioning

confidence: 99%

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Sensor assisted movement identification and prediction for beamformed 60 GHz links

Doff

Chandra

Prasad

2015

2015 12th Annual IEEE Consumer Communications and Networking Conference (CCNC)

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The 60 GHz frequency band promises very high data rates -in the order of Gb/s -due to the availability of large amounts of bandwidth. High freespace path loss at the 60 GHz frequency band makes it necessary to employ beamforming capable directional antennas to confine signal power in the desired direction. When beamforming is used, the links are sensitive to misalignment in antenna directionality, due to the movement of devices. To identify and circumvent the misalignments, we propose to use motion sensors (i.e., accelerometer and gyroscope) which are already present in most modern mobile devices. By finding the extent of misaligned beams, corrective actions are carried out to reconfigure the antennas. Motion sensors in mobile devices provide means to estimate the extent of misalignments. We collected real data from motion sensors and steered the beams appropriately. The results from our study show that the sensors are capable of detecting the cause of the error as translational or rotational movements. Furthermore it is also shown that sensor data can be used to predict the next location of the user. This can be used to reconfigure the directional antenna to switch the antenna beam and hence avoid frequent link disruptions. This decreases the number of beam searches, thus lowering the MAC overhead.iv Preface During my Embedded Systems master I always tried to achieve a broad understanding in many topics related to embedded systems. My graduation project has been no different, it was yet another unexplored topic; wireless communications. This past year I worked not only on wireless communications, but also learnt the ups and downs of being on the forefront of academic research. The result of which is not only this M.Sc. thesis, but also two published papers at the IEEE Consumer Communications and Networking Conference (CCNC).

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Section: Challengesmentioning

confidence: 99%

“…The results differ under the influence of blockage, since blocked signals encounter 20-30 dB more attenuation [13]. Thus these same simulations were done, however now with the effects of body blockage.…”

Section: Scenario 1: Stationary and Turningmentioning

confidence: 99%

Sensor assisted movement identification and prediction for beamformed 60 GHz links

Doff

Chandra

Prasad

2015

2015 12th Annual IEEE Consumer Communications and Networking Conference (CCNC)

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“…So, we use a 3D ray tracing software called Radiowave Propagation Simulator (RPS) [5,22] to obtain the CIRs. RPS can predict, with verified accuracy, the paths between arbitrary transmitter and receiver positions and antenna patterns.…”

Section: Ghz Channel Simulation With 3d Ray Tracingmentioning

confidence: 99%

“…One practical solution is to transport the signals through reflective paths induced by large surfaces like walls. Although the reflective paths will introduce more attenuation, typically 15-20 dB [5] or even lower for some reflective materials [6], beamforming may be used to compensate this loss. But there is also the possibility that no reflective paths can be found since the reflections strongly depend on the physical environment, like the reflectivity of the walls and furniture.…”

Section: Introductionmentioning

confidence: 99%

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Wang

Debbarma

et al. 2014

Wireless Pers Commun

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The 60 GHz unlicensed frequency band has been adopted to support high data rate WLAN applications. The problem of this frequency band is that the wireless signal is vulnerable to the shadowing of objects. Especially in indoor scenarios, humans may frequently block the signal paths that cause disconnections of devices. This problem can be mitigated by using multiple antennas that can create rich signal paths between the devices. The idea presented in this paper is to employ a distributed antenna system (DAS) architecture enabled by radio-over-fiber technology to alleviate the shadowing problem. In the DAS architecture, multiple remote antenna units (RAUs), each of them equipped with an antenna array, are connected with the same WLAN access points via optical fibers. But there are questions that need to be answered, including the beamforming strategy with multiple RAUs, and the placement and the required number of the RAUs. These questions are related to factors like room size, population density, etc. We discuss these questions in this paper and present our findings through theoretical models and extensive simulations, which can be referred to for practical implementations. We find that the proposed 60 GHz DAS can significantly improve the link connectivity. Even when only two RAUs are used, the signal coverage can be improved to an acceptable percentage in heavy shadowing scenarios.

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“…One can employ Iterative Quadratic ML (IQML) algorithm [12] to solve (8) if the array is a ULA. However, the computational complexity is high.…”

Section: Algorithmmentioning

confidence: 99%

Successive AoA estimation: Revealing the second path for 60 GHz communication system

Tsang

Poon

2011

2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton)

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60 GHz communication system is a viable candidate to support very high data throughput for wireless communication. To compensate for high path loss at 60 GHz frequency, a large number of antenna elements are employed to form highly directional beams for communication range extension. However, communication paths are easily be blocked by human movement. Switching to the second best path when needed is to protect against human blockage.Before switching to the second best path, the device needs to know a list of available alternative paths. Acquiring the list is related to Angle of Arrival (AoA) estimation problem. Though many high resolution AoA estimation algorithms are proposed in the literature, the unique features in the 60 GHz system require special attentions. We propose successive AoA estimation algorithm to utilize the features in the system. The scheme borrows the concept from successive interference cancellation scheme in multiuser detection. It provides compelling performance if there are large signal strength disparities among users, which is also observed in AoA estimation for 60 GHz system. The proposed scheme is very efficient as the AoA estimation step during each iteration is shown to be convex. Numerical results demonstrate that the proposed scheme outperforms other schemes and is shown to be a good candidate to reveal the alternative paths for the 60 GHz system.

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Robust 60 GHz Indoor Connectivity: Is It Possible with Reflections?

Cited by 54 publications

References 10 publications

Sensor assisted movement identification and prediction for beamformed 60 GHz links

Sensor assisted movement identification and prediction for beamformed 60 GHz links

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Successive AoA estimation: Revealing the second path for 60 GHz communication system

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