Spread-Spectrum Sharing Using Comb Spectrum Structure in a Microcell/Macrocell Cellular Architecture

Tomoko ADACHI  Masao NAKAGAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E79-B   No.10   pp.1577-1585
Publication Date: 1996/10/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Mobile Communication
Keyword: 
microcell/macrocell cellular architecture,  SS sharing,  CDMA,  TDMA,  comb spectrum structure,  

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Summary: 
Spread-spectrum (SS) sharing with comb spectrum structure in a microcell/macrocell cellular architecture in order to increase spectral efficiency is proposed. Such method employs a filter in the code division multiple access (CDMA) transmitter to feature comb spectrum structure, and suppress interference with a narrowband time division multiple access (TDMA) system in using together in SS sharing. The relationship between microcellular capacity and macrocellular capacity of the system is explored and compared to those of conventional SS sharing and orthogonal sharing. To be concrete, we investigate two cases, i.e., using no power control and ideal power control in the TDMA system. In both cases, the proposed SS sharing gives better capacity results than the conventional SS sharing and in the comparison when ideal power control is used in th. TDMA system, it even has the property to oppose the orthogonal sharing in ideal condition without interference.