Experimental study on performance of IEEE 802.11n and impact of interferers on the 2.4 GHz ISM band

Fiehe, Sandra; Riihijärvi, Janne; Mähönen, Petri

doi:10.1145/1815396.1815408

Cited by 32 publications

(13 citation statements)

References 3 publications

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“…Our main objective is to study whether the extremely high theoretical maximum throughputs are actually achievable in practice, and how severely interference from legacy Wi-Fi systems and other ISM band transmitters degrades the performance of IEEE 802.11ac networks. As was observed already for IEEE 802.11n in several measurement studies (see, for example, [9]- [12]) the large gains from use of MIMO are expected to be heavily dependent on the actual propagation environment, and it is not clear if the high predicted throughputs are achievable even in the absence of interference.…”

Section: Introductionmentioning

confidence: 95%

Measurement-based study of the performance of IEEE 802.11ac in an indoor environment

Dianu

Riihijärvi

Petrova

2014

2014 IEEE International Conference on Communications (ICC)

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We present results from a measurement-based study of the performance of the emerging IEEE 802.11ac Wi-Fi standard in an indoor environment. The measurements were conducted in a typical office building, and show that for small distances IEEE 802.11ac offers significantly improved performance compared to IEEE 802.11n. However, these performance improvements were also found to be quite sensitive to channel conditions, with the achieved data rates rapidly declining as the distance between the transmitter and the receiver is increased. We also studied the coexistence properties of IEEE 802.11ac through measurements, observing that adjacent channel interference from legacy Wi-Fi devices can have a severe performance impact. For co-channel interference, the medium access control mechanism of IEEE 802.11ac allows it to share the channel effectively with other Wi-Fi devices.

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Section: Introductionmentioning

confidence: 95%

Measurement-based study of the performance of IEEE 802.11ac in an indoor environment

Dianu

Riihijärvi

Petrova

2014

2014 IEEE International Conference on Communications (ICC)

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“…Though in theory channel bonding (combined with MIMO) significantly increases spectrum efficiency and utilization, practical deployments seem to indicate otherwise. It is noted that channel bonded Wi-Fi devices are severely impacted by interference from other Wi-Fi devices operating on a co-and adjacent channel basis; resulting in a performance anomaly where the higher rate modulation schemes become degraded by lower rate schemes [11]- [13]. To overcome this problem, requires knowledge about both desired and interfering link transmission power and distance, their channel separation, their physical rates, and use of techniques based on power control, explicit link scheduling, and resolution of hidden and exposed terminals, a problem which increases significantly with ACI and overlapping and adjacent channels [14], [15].…”

Section: B the Wi-fi Legacy And Path To Ism-advancedmentioning

confidence: 99%

ISM-Advanced: Improved access rules for unlicensed spectrum

Medeišis

Sydor

Cremene

et al. 2014

2014 IEEE International Symposium on Dynamic Spectrum Access Networks (DYSPAN)

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Access to unlicensed spectrum has thus far been based on simplistic rules, such as a transmission power limitation, requirement for tolerance of interference, and a relaxed out-of-band transmission mask. Such rules originate from the rudimentary applications originally envisaged for such spectrum, which don't consider the current technical capabilities of radio devices. This paper introduces the concept of "ISMAdvanced", which incorporates Cognitive Radio capabilities into the rules for unlicensed spectrum access in ISM bands. It is argued and shown that the introduction of such capabilities can significantly improve the efficiency of spectrum usage, as well as the quality of service that is experienced by spectrum users. Moreover, constraints such as on transmission power can be relaxed under the proposed scheme, and the stability in performance of unlicensed spectrum can be improved. Among many other benefits, these characteristics facilitate use of unlicensed spectrum by quality-of-service-conscious telecommunication service entities such as cellular (LTE) operators, likely in aggregation with and supplementing their licensed spectrum.In view of the increased use and allocations being seen of unlicensed spectrum, it is suggested that the policies and technical rules that govern dynamic spectrum access in ISM bands be reviewed bringing them up to a level matching technical capabilities of modern radio equipment using Cognitive Radio technology.

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“…In [10] performance degradation in 802.11n due to various interferers and levels of attenuation is experimentally evaluated. The authors focus on the former and conclude that theoretical performance gains due to MIMO cannot be reached in practise.…”

Section: Related Workmentioning

confidence: 99%

Low RSSI in WLANs: Impact on application-level performance

Tauber

Bhatti

2013

2013 International Conference on Computing, Networking and Communications (ICNC)

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Widespread use of wireless LAN (WLAN) may soon cause an over-crowding problem in use of the ISM spectrum. One way in which this manifests itself is the low Received Signal Strength Indication (RSSI) at the WLAN stations, impacting performance. Meanwhile, the IEEE 802.11 standard is being evolved and extended, for example with new coding schemes and the 802.11n standard, which makes use of 5GHz and 2.4GHz. An application's performance requirements may dictate the choice of technology determined by RSSI levels. We report on measurements of the upper and lower bounds of performance with good and poor RSSI in 802.11g and 802.11n. We find that in operation under poor (low) RSSI, performance is indeed impacted. In some cases the impact is such that there may be little benefit in using the newer 802.11n over 802.11g.

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Experimental study on performance of IEEE 802.11n and impact of interferers on the 2.4 GHz ISM band

Cited by 32 publications

References 3 publications

Measurement-based study of the performance of IEEE 802.11ac in an indoor environment

Measurement-based study of the performance of IEEE 802.11ac in an indoor environment

ISM-Advanced: Improved access rules for unlicensed spectrum

Low RSSI in WLANs: Impact on application-level performance

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