Title :
A highly versatile beamforming ASIC for application in broad-band fixed wireless access systems
Author :
Duan, Ji-Ning ; Ko, LiJen ; Daneshrad, Babak
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
3/1/2000 12:00:00 AM
Abstract :
This paper presents the architecture and implementation of a highly versatile beamforming ASIC (VBASIC) for application in broad-band fixed wireless access systems. The architecture accommodates a large number of user-programmable parameters, which broaden the chip´s application base to a variety of present and future systems for fixed wireless access. These features include: (a) a novel structure for variable-rate interpolation that allows operation at any user specified symbol rate from 625 kBaud to 10 MBaud; (b) operation in both the transmit and receive modes; (c) support for arrays consisting of up to 64 elements; (d) a unique shaping filter structure with programmable canonic signed digit coefficients; (e) complete reconfiguration of all parameters on a per-time-slot basis; and f) digital intermediate-frequency interface. The resulting layout measures 7.1 mm on each side in the 0.6-/spl mu/m HPCMOS14 process and consists of a total of 787 987 transistors.
Keywords :
VLSI; application specific integrated circuits; array signal processing; digital signal processing chips; interpolation; radio access networks; 0.6 micron; 625 kbit/s to 10 Mbit/s; HPCMOS14 process; VBASIC; beamforming ASIC; broad-band fixed wireless access systems; digital intermediate-frequency interface; per-time-slot basis; programmable canonic signed digit coefficients; shaping filter structure; user specified symbol rate; user-programmable parameters; variable-rate interpolation; Antenna arrays; Application specific integrated circuits; Array signal processing; Bandwidth; Base stations; Delay; Digital filters; Directive antennas; Interpolation; Phased arrays;
Journal_Title :
Solid-State Circuits, IEEE Journal of
