Title :
Capacity analysis of spectrally overlaid multiband CDMA mobile networks
Author :
Jeong, Dong Geun ; Kim, Il Gyu ; Kim, Dongwoo
Author_Institution :
Dept. of Electron. Eng., Hankuk Univ. of Foreign Studies, Kyonggi-do, South Korea
fDate :
8/1/1998 12:00:00 AM
Abstract :
The future (third-generation) mobile communications system will provide not only voice and low-speed data services, but also video and high-speed data services. It will eventually have the capability for wireless multimedia communications. As a radio-access technique for such a system, the code-division multiple access (CDMA) has been considered in many potential third-generation systems including CODIT and the proposal of Ohno, Sawahashi and Adachi (see Proc. IEEF VTC´95, Chicago, IL, p.779-83, 1995). We model those CDMA systems as the spectrally overlaid multiband CDMA (SOM-CDMA) system. In an SOM-CDMA system, several CDMA (sub)systems with different spreading bandwidths are spectrally overlaid with each other. The reverse-link capacity of an SOM-CDMA system is calculated, and some numerical results are presented with discussion. As a result, we demonstrate how much capacity the SOM-CDMA has and how we can achieve an optimal allocation of frequency and power between (sub)systems. The results can be used as a guideline in designing the radio network of SOM-CDMA systems as well as a means to assess the performance of given systems. The results can be applied to any CDMA system with an SOM-CDMA concept, including CODIT and the proposal of Ohno et. al
Keywords :
channel capacity; code division multiple access; data communication; frequency allocation; land mobile radio; multimedia communication; radio links; radio networks; spread spectrum communication; voice communication; CDMA mobile networks; CODIT; code-division multiple access; high-speed data; low-speed data services; numerical results; optimal frequency allocation; optimal power allocation; performance; radio network design; radio-access technique; reverse-link capacity; spectrally overlaid multiband networks; spreading bandwidths; third-generation mobile communications; video; voice services; wireless multimedia communications; Bandwidth; Collision mitigation; Mobile communication; Multiaccess communication; Multimedia communication; Personal communication networks; Proposals; Radio spectrum management; Telecommunication traffic; Wireless communication;
Journal_Title :
Vehicular Technology, IEEE Transactions on
