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Adjacent channel interference in 802.11a: Modeling and testbed validation

Adjacent channel interference in 802.11a: Modeling and testbed validation,10.1109/RWS.2008.4463561,Vangelis Angelakis,Stefanos Papadakis,Vasilios Siri

Adjacent channel interference in 802.11a: Modeling and testbed validation   (Citations: 12)
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In this work we utilize the model for calculation of the interference power by partially overlapping channels and combine it with the signal to interference plus noise (SINK) criterion for signal capture to quantify the effect of adjacent channel interference (ACI) in 802.11a. We validate the results from our theoretical model by applying it on an in-lab testbed, in which we use signal splitters/combiners and fixed attenuators to emulate the wireless channel. Our experiment setup is able to isolate the mechanisms that the neighboring channel interference affects the 802.11a: the packet capture at the receiver and the clear channel assessment (CCA) mechanism. We quantify the effect of ACI for both of these mechanisms in terms of throughput. Our results indicate that equipping a single node with multiple interfaces requires careful channel allocation and physical antenna separation, since throughput can be severely degraded. Our future work focuses on field experimenting with 802.11a multi-radio mesh nodes in order to introduce the antenna characteristics in our model.
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    • ...If the signal and interference j are associated with the same channel, then the case can be analyzed in terms of cochannel interferences with ζj of 1. A simple model for calculating the factor ζj was presented in [20]...
    • ...The factor ζj is obtained by [20] as follows:...

    Cheng-Nan Huet al. Improved IC Production Yield by Taking Into Account the Electromagneti...

    • ...When two interfaces ��, �� operate on non-orthogonal channels, the adjacent channel interference that �� causes to �� can be calculated using �� ��,�� = �� �� ⋅ �� ��,�� ⋅ �� ��,�� , where factor �� ��,�� depends on the inter-channel spectral distance, the channel width, and the spectral mask [8]; �� ��,�� is added to �� �� above...

    Vasilios A. Siriset al. A Simple End-to-End Throughput Model for 802.11 Multi-Radio Multi-Rate...

    • ...Previous studies measured the impact of cross-band interference among WiFi devices [2, 6] or between WiFi and other devices [35], but did not provide any systematic solutions to suppress the interference...

    Lei Yanget al. The Spaces Between Us: Setting and Maintaining Boundaries in Wireless ...

    • ...Moreover, channel assignment determines the interference between adjacent channels; such interference exists not only for 802.11b/g, but - contrary to common belief - also for 802.11a when the distance of antennas is small [4], [5], which is the case when they are located in the same mesh node...
    • ...Finally, to model the adjacent channel interference, we consider the power leakage for 802.11a channels shown in Table I, which are derived using an analytical model verified with measurements in an actual test-bed [5]...

    Theodoras Dionysiouet al. Utility-based channel assignment and topology control in wireless mesh...

    • ...There are earlier studies on the validation of analytical models and simulations against experimental testbeds [13], [14], [15], [16]...
    • ...Angelakis et al. [14] validate channel interference models in 802.11a, but they use an emulated wireless medium to avoid any non-deterministic interference...

    Shrirang Mareet al. Experimental validation of analytical performance models for IEEE 802....

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