The myth of non-overlapping channels: interference measurements in IEEE 802.11

@inproceedings{citeulike:1655753, abstract = {It has become a widely accepted assumption that multiple IEEE 802.11b/g transmissions in physical proximity can coexist without interfering each other. This is claimed to be the case when using separate channels with a minimum distance of 25 MHz, e.g. channel 1 and 6, which are often referred to as non-overlapping. In contrast we show that in practice cross-channel interference can be present also between non-overlapping channels if the interfering transmitter is in the proximity of the receiver. This phenomenon is known as the "near-far effect" in wireless communications. On IEEE 802.11 this has two main effects: frame corruption due to increased interference noise and channel blocking due to spurious carrier detection. The problem can be particularly serious when using IEEE 802.11 technology to build multi-hop mesh networks. Through an extensive set of experiments with off-the-shelf certified WiFi chipsets we demonstrate the presence and the detrimental effects of cross-channel interference between non-overlapping channels. We adopt an incremental approach: we first consider the case of unacknowledged broadcast packets, then we extend to regular UDP streams, finally we provide preliminary results for multi-hop TCP flows}, author = {Fuxjager, P. and Valerio, D. and Ricciato, F. }, booktitle = {Wireless on Demand Network Systems and Services, 2007. WONS '07. Fourth Annual Conference on}, citeulike-article-id = {1655753}, journal = {Wireless on Demand Network Systems and Services, 2007. WONS '07. Fourth Annual Conference on}, keywords = {80211, channel\_orthogonality, interference, mac, mesh, multi-channel, multi-radio, wireless}, pages = {1--8}, posted-at = {2007-09-14 12:04:29}, priority = {0}, title = {The myth of non-overlapping channels: interference measurements in IEEE 802.11}, url = {http://ieeexplore.ieee.org/xpls/abs\_all.jsp?arnumber=4142700}, year = {2007} }

TY - CONF ID - citeulike:1655753 L3 - citeulike-article-id:1655753 TI - The myth of non-overlapping channels: interference measurements in IEEE 802.11 T2 - Wireless on Demand Network Systems and Services, 2007. WONS '07. Fourth Annual Conference on JF - Wireless on Demand Network Systems and Services, 2007. WONS '07. Fourth Annual Conference on SP - 1 EP - 8 N2 - It has become a widely accepted assumption that multiple IEEE 802.11b/g transmissions in physical proximity can coexist without interfering each other. This is claimed to be the case when using separate channels with a minimum distance of 25 MHz, e.g. channel 1 and 6, which are often referred to as non-overlapping. In contrast we show that in practice cross-channel interference can be present also between non-overlapping channels if the interfering transmitter is in the proximity of the receiver. This phenomenon is known as the "near-far effect" in wireless communications. On IEEE 802.11 this has two main effects: frame corruption due to increased interference noise and channel blocking due to spurious carrier detection. The problem can be particularly serious when using IEEE 802.11 technology to build multi-hop mesh networks. Through an extensive set of experiments with off-the-shelf certified WiFi chipsets we demonstrate the presence and the detrimental effects of cross-channel interference between non-overlapping channels. We adopt an incremental approach: we first consider the case of unacknowledged broadcast packets, then we extend to regular UDP streams, finally we provide preliminary results for multi-hop TCP flows KW - 80211 KW - channel_orthogonality KW - interference KW - mac KW - mesh KW - multi-channel KW - multi-radio KW - wireless AU - Fuxjager, P AU - Valerio, D AU - Ricciato, F PY - 2007/// UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4142700 ER -