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

fYear

1997

fDate

17-19 Dec 1997

Firstpage

380

Lastpage

383

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal Wireless Communications, 1997 IEEE International Conference on

Conference_Location

Mumbai

Print_ISBN

0-7803-4298-4

Type

conf

DOI

10.1109/ICPWC.1997.655546

Filename

655546