Title :
Digital beamforming for smart antennas
Author :
Nuteson, T.W. ; Mitchell, G.S.
Author_Institution :
The Aerospace Corp., Chantilly, VA, USA
Abstract :
An 8-channel digital phased array antenna (PAA) is designed and evaluated for a smart antenna application in the cellular PCS band (1850 MHz to 1990 MHz). Each channel is digitized at the RF carrier frequency using bandpass sampling clocking up to 1.5 Gsps with a 140 MHz bandwidth. The beamforming and additional signal processing is implemented digitally using field programmable gate arrays (FPGAs). This paper characterizes the PAA system for effects on loading analog-to-digital converters (ADCs) including automatic gain control (AGC) techniques and cochannel interference.
Keywords :
UHF antennas; adaptive antenna arrays; analogue-digital conversion; antenna phased arrays; array signal processing; automatic gain control; cellular radio; cochannel interference; field programmable gate arrays; 140 MHz; 1850 to 1990 MHz; 8-channel digital phased array antenna; ADC loading; AGC techniques; FPGAs; analog-to-digital converters; automatic gain control techniques; bandpass sampling; cellular PCS band; cochannel interference; digital beamforming; field programmable gate arrays; signal processing; smart antennas; Antenna arrays; Array signal processing; Bandwidth; Clocks; Field programmable analog arrays; Field programmable gate arrays; Personal communication networks; Phased arrays; Radio frequency; Signal sampling;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.966854
