Throughput Improvement Via Smart Antenna and Link Adaptation Scheme for IEEE 802.11A Systems

Author

Juang, Rong-Terng ; Lin, Hsin-Piao ; Lin, Ding-Bing

Author_Institution

Inst. of Comput. & Commun., Nat. Taipei Univ. of Technol.

fYear

2006

fDate

11-14 Sept. 2006

Firstpage

1

Lastpage

5

Abstract

Propagation delay spread and inter-symbol interference impact the transmission performance of WLAN systems. This paper presents performance enhancement using beamforming techniques operated at the access point. The performance by using omni-directional, switched beam system and phase array system in an indoor office are analyzed and compared. Based on the IEEE 802.11a physical layer specification, numerical simulations indicate that adopting directional antennae at the access point can increase diversity gain in non-line-of-sight propagations channels, while the packet error rate remains below 10^-2. Besides, this paper also presents a link adaptation algorithm, based on the Ricean k-factor and signal to noise ratio, for throughput enhancement in IEEE 802.11a systems. Simulation results show that the average throughput reaches 33.7 Mbps in the signal-strength-based conventional algorithm, but rises to 43.1 Mbps when adopting the proposed scheme

Keywords

Rician channels; adaptive antenna arrays; antenna phased arrays; directive antennas; diversity reception; indoor radio; intersymbol interference; radiowave propagation; wireless LAN; IEEE 802.11a physical layer specification; Ricean k-factor; WLAN systems; access point; beamforming techniques; directional antennae; diversity gain; indoor office; intersymbol interference; link adaptation scheme; nonline-of-sight propagations channels; omni-directional switched beam system; packet error rate; performance enhancement; phase array system; propagation delay spread; signal-strength-based conventional algorithm; signal-to-noise ratio; smart antenna; throughput improvement; Adaptive arrays; Antennas and propagation; Array signal processing; Interference; Performance analysis; Phased arrays; Physical layer; Propagation delay; Throughput; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

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

Conference_Location

Helsinki

Print_ISBN

1-4244-0329-4

Electronic_ISBN

1-4244-0330-8

Type

conf

DOI

10.1109/PIMRC.2006.254469

Filename

4022723