Title :
Design and implementation of modulator ASIC for CDMA WLL system
Author :
Lee, J.H. ; Jeong, Y.G. ; Ha, K.M.
Author_Institution :
Mobile Commun. Div., Electron. & Telecommun. Div., Taejon, South Korea
Abstract :
We present the design and implementation of modulator ASIC in a direct sequence code division multiple access (DS-CDMA) wireless local loop (WLL) system. The WLL system consists of two links: one is a forward link (fixed station-mobile); the other is a reverse link (mobile-fixed station). We only consider the issues of the ASIC design and implementation in the forward link. We present an efficient structure of the forward link in the WLL system. According to the proposed structure, the modulator ASIC is composed of two channels which perform channel coding, block interleaving and spreading, and with four baseband filters. The ASIC is fabricated using a 0.6 μm CMOS process with 40 k gates and was successfully tested on a WLL test-bed system
Keywords :
CMOS digital integrated circuits; application specific integrated circuits; channel coding; code division multiple access; interleaved codes; land mobile radio; modulators; pseudonoise codes; radio links; radiofrequency filters; spread spectrum communication; subscriber loops; 0.6 micron; 32 MHz; CDMA; CMOS process; DS-CDMA; WLL system; Walsh codes; baseband filters; block interleaving; channel coding; direct sequence code division multiple access; fixed station-mobile link; forward link; modulator ASIC design; spreading; test-bed system; wireless local loop; Application specific integrated circuits; Baseband; CMOS process; Channel coding; Direct-sequence code-division multiple access; Filters; Interleaved codes; Modulation coding; Multiaccess communication; System testing;
Conference_Titel :
Personal Wireless Communications, 1997 IEEE International Conference on
Conference_Location :
Mumbai
Print_ISBN :
0-7803-4298-4
DOI :
10.1109/ICPWC.1997.655546
