WSN07-1: Adjacent Channel Interference in Dual-radio 802.11a Nodes and Its Impact on Multi-hop Networking

Cheng, Chen-Mou; Hsiao, Pai-Hsiang; Kung, H. T.; Vlah, Dario

doi:10.1109/glocom.2006.500

Cited by 57 publications

(57 citation statements)

References 9 publications

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“…Adjacent channels in IEEE 802.11a, contrary to common belief, can interfere with each other when their connected antennas are close [16], [17], [1]; this occurs when a wireless interface is receiving and another interface in the same mesh node is transmitting. In such cases, the links would need to be assigned channels with a separation that depends on the distance between their corresponding antennas.…”

Section: Multi-point Link Conflict Graphmentioning

confidence: 93%

Channel assignment in a metropolitan wireless multi-radio mesh network

Delakis

Siris

2008

2008 5th International Conference on Broadband Communications, Networks and Systems

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Abstract-We investigate the problem of channel assignment in a metropolitan wireless multi-radio mesh network with directional antennas. We first present a new conflict graph model for capturing the interference between links in a mesh network with a known wireless interface communication graph. Then we present a channel assignment procedure which accounts for interference both between links internal to the mesh network, and from external sources. Key components of the channel assignment procedure are the interference model, the link ordering, and the channel selection metric. We have implemented and evaluated the proposed channel assignment procedure in an actual metropolitan mesh network with link distances from 1.6 to 5 Km. The experimental results demonstrate how link ordering and the channel selection metric affect performance, in terms of the average packet delay and http latency. Moreover, the experimental results show that the proposed channel assignment procedure achieves performance that is within approximately 11% of a lower bound of the average packet delay, and significantly higher than the performance achieved with a simpler interference-unaware procedure.

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Section: Multi-point Link Conflict Graphmentioning

confidence: 93%

Channel assignment in a metropolitan wireless multi-radio mesh network

Delakis

Siris

2008

2008 5th International Conference on Broadband Communications, Networks and Systems

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“…In a separate paper, we reported measurements of the ACI interference using a spectrum analyzer [8]. We include some of those measurement results in Table I: the values represent relative interference power in 802.11a channels adjacent to channel 52.…”

Section: A Issues Specific To Multi-radio Nodesmentioning

confidence: 99%

Parallel Use of Multiple Channels in Multi-hop 802.11 Wireless Networks

et al. 2006

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We consider parallel use of multiple channels in a multi-radio, multi-hop 802.11 wireless network, with the goal of maximizing the total multi-hop throughput. We first quantify several fundamental forms of radio interference that cause performance degradation when the number of hops increases and that prevent total throughput from scaling up with number of radio interfaces at each node. We then evaluate three different methods of parallel channel use: Ad-Hoc, FrequencyDivision Multiplexing (FDM), and Time-Division Multiplexing (TDM). We measure their performance on a linearly connected multi-hop network of dual-radio nodes. Although theoretically these three methods should have comparable performance, their actual measured performances are quite different. We find that TDM has the best performance, followed by Ad-Hoc and then FDM. The performance differences are due to these methods' capabilities of combating interference. We conclude that interference, especially adjacent channel interference, has significant effect on the achievable performance of a multi-radio, multi-hop network and hence should be carefully taken into account in the design and deployment of such a network.

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“…Even if the adjacent channels are used among WLAN devices, the interference from CH-2 arrives at the spurious on the CH-1, because the received power between the transmitter and receiver at the developed AP is much higher than the receiver at the developed AP from the AP1. It is reported that the mutual interference among adjacent channels is a big problem [12], when WLAN devices are mounted in adjacent space and each device use neighbor channels.…”

Section: Target Scenario and Problemmentioning

confidence: 99%

“…Even if the multi-hop system operates different channels, the transmitting signal of the other channel affects the adjacent channels due to its leakage power among the devices which are installed closely together inside the common aluminum chassis. Hence, the throughput performance by the relay transmission is degraded by such an interference [12].…”

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confidence: 99%

Power Saving Control Method for Battery-Powered Portable Wireless LAN Access Points in an Overlapping BSS Environment

Ogawa¹,

Hiraguri

Nishimori

et al. 2011

IEICE Trans. Commun.

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SUMMARYThis paper proposes a new Ad-Hoc network system which comprises the multiple relay access points (APs) with multi channels. AdHoc network systems are recently proposed and incorporated for the communication infrastructure, which relays wireless transmission among access points (APs) in wireless LAN (WLAN) system. System throughput is decreased due to hidden terminal problem when only a single channel is used for the Ad-Hoc network. In order to solve this problem, a new system with multi channels is proposed. However, even if the multi channels are employed, the co-and/or adjacent-channel interference occurs due to hidden terminal problem and multiple APs in a limited space, when considering a simultaneous transmit and reception at the relay AP. In this paper, we develop an Ad-Hoc network testbed which can reduce and avoid coand/or adjacent-channel interference by using vertically arranged antenna configuration and distributed channel allocation scheme. Moreover, the effectiveness of our testbed is clarified by applying actual WLAN signals.

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WSN07-1: Adjacent Channel Interference in Dual-radio 802.11a Nodes and Its Impact on Multi-hop Networking

Cited by 57 publications

References 9 publications

Channel assignment in a metropolitan wireless multi-radio mesh network

Channel assignment in a metropolitan wireless multi-radio mesh network

Parallel Use of Multiple Channels in Multi-hop 802.11 Wireless Networks

Power Saving Control Method for Battery-Powered Portable Wireless LAN Access Points in an Overlapping BSS Environment

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