Title :
Design of a modulator ASIC for wide band CDMA wireless local loop system
Author :
Lee, Jae H. ; Bahg, Young J. ; Cho, Kyoung R.
Author_Institution :
Div. of Mobile Telecommun. Technol., ETRI, Taejon, South Korea
Abstract :
In this paper, we present the design and implementation of modulator ASIC in direct sequence code division multiple access (DS-CDMA) wireless local loop (WLL) system. Here we just consider the issues of design and implementation of the channel in the forward link. We proposed a new base band filter structure reducing hardware size to one-half of conventional circuits. The modulator ASIC is composed of four channels which include channel coding, block interleaving, pseudonoise (PN) spreading, and four baseband filters. The ASIC is fabricated using 0.6 μm CMOS process with 40 k gates and is operated at 32 MHz. The implemented ASIC is successfully tested on WLL testbed system
Keywords :
application specific integrated circuits; channel coding; code division multiple access; modulators; radio access networks; 0.6 micron; 32 MHz; CMOS process; WLL testbed system; base band filter structure; baseband filters; block interleaving; channel coding; direct sequence code division multiple access; forward link; modulator ASIC; pseudonoise spreading; wide band CDMA; wireless local loop system; Application specific integrated circuits; Channel coding; Circuit testing; Direct-sequence code-division multiple access; Filters; Hardware; Modulation coding; Multiaccess communication; System testing; Wideband;
Conference_Titel :
Circuits and Systems, 1998. Proceedings. 1998 Midwest Symposium on
Conference_Location :
Notre Dame, IN
Print_ISBN :
0-8186-8914-5
DOI :
10.1109/MWSCAS.1998.759563
