Title :
A Closed-Loop Link Adaptation Scheme for 324Mbit/sec WLAN System
Author :
Nagai, Yukimasa ; Fujimura, Akinori ; Akihara, Masaya ; Shirokura, Yoshihiko ; Ishizu, Fumio ; Nakase, Hiroyuki ; Kameda, Suguru ; Oguma, Hiroshi ; Tsubouchi, Kazuo
Author_Institution :
Mitsubishi Electr. Corp., Kamakura
Abstract :
We developed a high speed wireless LAN prototype in the 5 GHz band. Maximum transmission rate of the developed WLAN system is 324 Mbit/sec using 6 multi-channels of 802.11a. We propose a closed-loop link adaptation scheme to improve MAC efficiency. The proposed scheme inserts MCS (Modulation and Coding Scheme) feedback information into Data frame and ACK frame. The MCS is calculated based on the estimated SNR. We compared the proposed link adaptation scheme with the legacy ACK-based link adaptation schemes by computerized simulation. The proposed link adaptation scheme achieved higher throughput than the legacy ACK-based link adaptation scheme. We also found that the proposed link adaptation scheme selected the optimal MCS on the developed WLAN system.
Keywords :
access protocols; modulation; radio links; wireless LAN; IEEE 802.11a; MAC; WLAN system; bit rate 324 Mbit/s; closed-loop link adaptation scheme; coding scheme; feedback information; frequency 5 GHz; modulation; wireless local area network; Computer simulation; Feedback; MIMO; Modulation coding; Multiaccess communication; Physical layer; Quality of service; Signal to noise ratio; Throughput; Wireless LAN; Closed-loop link adaptation; IEEE802.11; Wireless Networks; performance evaluation;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-1144-3
Electronic_ISBN :
978-1-4244-1144-3
DOI :
10.1109/PIMRC.2007.4394326
