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To successfully develop IEEE 802.11a based wireless mesh network solutions that can achieve the reliability and capacities required to offer high quality triple play services, the use of multiple radios in each mesh node is essential. Unfortunately, the co-location of multiple antennas in a single device leads to a number of interference problems. In this paper the impact of non-overlapping channel interference in IEEE 802.11a based multi-radio nodes is investigated. A detailed explanation of the performance decreases and their relation to radio settings is presented. The primary contribution of this paper is the discovery of a channel interference effect which is present over the entire 802.11a frequency space.
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