Cochannel interference avoidance algorithm in 802.11 wireless LANs

Li, Y.; Wang, X.; Mujtaba, S.A.

doi:10.1109/vetecf.2003.1286020

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…Li et al [11] propose an interference avoidance algorithm to mitigate the interference from the neighbor BSS operating at the same channel. However, this scheme enables AP to drop its defer threshold to energy detect threshold when transmitting to stations located at overlapping area.…”

Section: Related Workmentioning

confidence: 99%

“…In the DTPC, the stations located at overlapping area are referred as interference prone (IP) stations adopting the notion in [11]. As all the stations continually monitor the ongoing transmissions, combining with the information recorded in the path loss table, a station can determine whether it can start a concurrent transmission.…”

Section: Dynamic Transmit Power Controlmentioning

confidence: 99%

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Performance enhancement of overlapping BSSs via dynamic transmit power control

Rhee

2015

J Wireless Com Network

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In densely deployed wireless local area networks (WLANs), overlapping basic service sets (BSSs) may suffer from severe performance degradations. Mobile stations in a BSS may compete for channel access with stations that belong to another BSS in such environment, and it reduces overall throughput due to the increased collision probability. In this paper, we propose a new scheme for transmit power control, which enables mobile stations to dynamically adjust their transmit powers. Using our mechanism, those stations in different BSSs will have more chances of simultaneous transmissions and thus improve their performances by enhancing spatial reuse. We develop a Markov chain model to analyze the performance of the proposed scheme and also perform extensive simulations. Both the analytical and simulation results show that our mechanism effectively improves the network performance of WLANs.

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Section: Related Workmentioning

confidence: 99%

Section: Dynamic Transmit Power Controlmentioning

confidence: 99%

Performance enhancement of overlapping BSSs via dynamic transmit power control

Rhee

2015

J Wireless Com Network

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“…Furthermore, many algorithms have been proposed for automatic AP channel assignment [9], [10], [11]. Such algorithms, however, introduce high complexity trying to achieve the theoretical optimum in terms of co-channel interference vs. throughput and lack concrete guidelines for the deployment of wireless networks.…”

Section: Related Workmentioning

confidence: 99%

Deployment guidelines for highly congested IEEE 802.11b/g networks

Forte

Schulzrinne

2008

2008 16th IEEE Workshop on Local and Metropolitan Area Networks

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Abstract-Over the years, IEEE 802.11b/g wireless networks have been deployed in various locations such as hotels, airports and enterprises. Although IEEE 802.11b/g can be considered a mature technology, its deployment still presents challenges due to the limited number of non-overlapping channels available. This is particularly true in scenarios with a high density of users where a large number of APs covering roughly the same area is required.Through measurements we investigate different deployment scenarios, trying to provide a set of guidelines for the deployment of IEEE 802.11b/g networks so to minimize co-channel interference and maximize throughput. This, when the number of APs required to cover an area is larger than the number of non-overlapping channels available. In particular, we show how using partially overlapping channels causes lower retry rate and higher throughput than if deploying multiple APs on each of the non-overlapping channels.

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“…Examples of these methods are automatic frequency selection that is based on the received signal strength indicator (RSSI) [3], sub-carrier symbol erasure [4], and media access control (MAC) level interference avoidance [5,6]. These solutions are based on interference avoidance and require the IEEE 802.11's CCA mechanism to detect all nodes (i.e., exposing the nodes).…”

Section: Introductionmentioning

confidence: 99%

Adaptive Beamforming and Modulation for OFDM in Co-Working WLANs With ACK Eigen-Steering

Hardjawana

Vucetic

Jamalipour

2006

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications

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In this paper, we propose a method to reduce the interference and increase the throughput of orthogonal frequency division multiplexing (OFDM) systems in co-working wireless local area networks (WLANs) by using joint adaptive multiple antennas (AMA) and adaptive modulation (AM) with acknowledgement (ACK) Eigen-steering. The calculation of AMA and AM are performed at the receiver. The AMA is used to suppress interference and to maximise the signal to noise plus interference ratio (SNIR) by adjusting its weights dynamically. The improved SNIR is then used by AM as an input to allocate OFDM sub-carriers, power, and modulation mode subject to the constraints of power, discrete modulation, and the bit error rate (BER). The transmit weights, the allocation of power, and the allocation of sub-carriers are obtained at the transmitter using ACK Eigen-steering. The derivations of AMA, AM, and ACK Eigen-steering are shown. The performance of joint AMA and AM for various AMA configurations are evaluated through the simulations of BER and spectral efficiency (SE) against SIR. The simulation results for joint AMA-AM also show that joint AM and receive beamforming produce the most effective solution in co-working OFDM-WLANs.

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Cochannel interference avoidance algorithm in 802.11 wireless LANs

Cited by 9 publications

References 5 publications

Performance enhancement of overlapping BSSs via dynamic transmit power control

Performance enhancement of overlapping BSSs via dynamic transmit power control

Deployment guidelines for highly congested IEEE 802.11b/g networks

Adaptive Beamforming and Modulation for OFDM in Co-Working WLANs With ACK Eigen-Steering

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