Open AccessAn Improved Base Station Modulator Design for a CDMA Mobile System
Author(s) -
Kim Jinup,
Uh Yoon,
Kweon Hyeyeoun
Publication year - 1997
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.97.0197.0041
Subject(s) - code division multiple access , base station , electronic engineering , computer science , cdma spectral efficiency , interference (communication) , binary number , division (mathematics) , modulation (music) , engineering , telecommunications , arithmetic , mathematics , channel (broadcasting) , philosophy , aesthetics
We propose a new method to eliminate completely the redundant elements in a CDMA (code division multiple access) mobile system. First, we define multilevel logic operation (MLO), which is a new concept to deal with the multilevel logic signals. We prove that the conventional binary logic concept is a subset of the MLO concept. The multilevel logic signal can be directly controlled by using this MLO in place of the binary operation. We applied the MLO to the CDMA base station modulator (BSM) in order to reduce the hardware complexity. In the case of a 3‐sectorized cell, this method helps reduce the complexity down the level of below 1% of the conventional CDMA BSM for spreading and filtering, and to 50% for Walsh covering.