MAC layer issues and challenges of using smart antennas with 802.11

Jose, Babita R.; Yin, Hujun; Mehrotra, P.; Casas, E.

doi:10.1109/vetecf.2003.1286217

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…To exploit the benefits offered by the directional antennas, several researchers [3]- [4] have re-designed multiple access control (MAC) protocols by replacing omnidirectional antennas with directional antennas. However, when used in IEEE 802.11 systems, directional antennas present their own share of issues such as the hidden node problem, the hidden beam problem and deafness [5]. Some of these issues such as the hidden node problem and deafness have been investigated in [6]- [7].…”

Section: Introductionmentioning

confidence: 99%

Addressing the Hidden Beam Problem Using a Modified Beamformer

Arora

Agathoklis

2008

2008 International Wireless Communications and Mobile Computing Conference

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A beamforming technique is proposed to solve the hidden beam problem in systems relying on sensing the medium. The approach is based on raising the depth of the nulls to enable transmission sensing by mobile terminals. The performance of the modified beam is compared with that of an original beam in terms of beam parameters such as directivity and half power beamwidth (HPBW). Results show that the modified beam raises the null depths significantly and satisfies the minimum power threshold level with relatively small changes in directivity and HPBW compared to the original beam. The proposed beamforming technique is a simple and efficient approach to the solution of the hidden beam problem.

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