Title :
Array beamforming for slow FH spread-spectrum WLANs
Author :
Iltis, Ronald A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
A beamforming algorithm is presented for slow frequency-hopping wireless LAN which does not require prior knowledge of direction-of-arrival. The algorithm is motivated by Bluetooth and IEEE 802.11 FH networks, in which training sequences are transmitted to establish connections. Using prior knowledge of the training sequence, or post-beamforming data decisions, it is shown that correlation matrices containing interference-only and interference-plus-signal are readily formed. Established SNR maximization techniques are then employed to jointly suppress interference spatially, and beamform in the direction of the desired signal.
Keywords :
Bluetooth; adaptive antenna arrays; array signal processing; correlation methods; frequency hop communication; interference suppression; matrix algebra; spread spectrum communication; wireless LAN; Bluetooth; IEEE 802.11; SNR maximization; WLAN; array beamforming; correlation matrices; interference-only matrices; interference-plus-signal matrices; post-beamforming data decisions; prior knowledge; slow FH spread-spectrum communication; slow frequency-hopping; smart antennas; spatial interference suppression; training sequences; wireless LAN; Array signal processing; Calibration; Frequency shift keying; Frequency synchronization; Jamming; Matched filters; Phase noise; Spread spectrum communication; Tracking loops; Wireless LAN;
Conference_Titel :
Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7576-9
DOI :
10.1109/ACSSC.2002.1197062
