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MAC protocol of WLAN using smart adaptive array antennas

ZHAO Li-qiang;FAN Chang-xin

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071, China)

Received:1900-01-01 Revised:1900-01-01 Online:2004-08-20 Published:2004-08-20

Abstract

Abstract: Based on the characteristics of IEEE 802.11 WLAN, a medium access control protocol SADCF is proposed to support smart adaptive array antennas. A smart antenna has omnidirectional and directional operation modes. In SADCF, before sending any data frame, the station stimulates the corresponding station to transmit a training sequence by means of omnidirectional RTS/CTS handshake mechanism. Based on teh training sequence, the directional beam can be formed by the smart antenna. Then the station can transmit and receive data frames in directional mode. Other stations save the transmission time of the sender in omnidirectional mode by using the omnidirectional network allocation vector, and multiplex channel when it transmits in directional mode. SADCF is compatible with IEEE 802.11. Simulation results show that the SADCF protocol can suport smart antennas effectively and provide high throughput by multiplexing the channel, and results of the analysis are close to the simulation results.

Key words: WLAN, IEEE 802.11, MAC, DCF, smart adaptive array antenna

CLC Number:

TN915.9

ZHAO Li-qiang;FAN Chang-xin.

MAC protocol of WLAN using smart adaptive array antennas

[J].J4, 2004, 31(4): 602-607.

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MAC protocol of WLAN using smart adaptive array antennas

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