Title :
An Experimental Adaptive Beamforming System for the IEEE 802.16e-2005 OFDMA Downlink
Author :
Porter, Jeffrey W. ; Kepler, James F. ; Krauss, Thomas P. ; Vook, Frederick W. ; Blankenship, T. Keith ; Desai, Vip ; Schooler, Anthony ; Thomas, John
Author_Institution :
Lab. of Commun. Syst. Res., Motorola Labs, Schaumburg, IL
Abstract :
Transmit adaptive beamforming can be applied on the subcarriers of an OFDM system to obtain a coherent processing gain at the receiver. The IEEE 802.16e-2005 standard for mobile broadband wireless access contains signaling strategies that facilitate the use of downlink adaptive beamforming which leverages time-division duplex (TDD) channel reciprocity. Using these strategies, Motorola Labs has developed an experimental mobile multi-antenna OFDM system that implements a real-time, adaptive beamformer. This paper describes key components and parameters of this experimental system and describes the results of initial field experiments that show the performance gains realized by this platform
Keywords :
WiMax; adaptive antenna arrays; array signal processing; frequency division multiple access; mobile antennas; mobile radio; radio access networks; radio links; time division multiplexing; wireless channels; IEEE 802.16e-2005; OFDM system; OFDMA downlink; TDD; adaptive beamforming system; channel reciprocity; mobile broadband wireless access; mobile multi-antenna; time-division duplex; Adaptive arrays; Adaptive systems; Antenna arrays; Array signal processing; Downlink; OFDM; Radio frequency; Receiving antennas; Testing; Transmitting antennas; IEEE 802.16; OFDM; WiMAX; adaptive antennas; beamforming; broadband cellular;
Conference_Titel :
Radio and Wireless Symposium, 2007 IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
1-4244-0445-2
Electronic_ISBN :
1-4244-0445-2
DOI :
10.1109/RWS.2007.351871
