Title :
A study of wireless access networks architecture using multi-level modulation methods
Author :
Nishi, Masahiro ; TEraoka, Hitomi ; Yoshida, Teruaki
Author_Institution :
Fac. of Inf. Sci., Hiroshima City Univ., Japan
Abstract :
A new type of wireless access network architecture using the 5 GHz frequency band is proposed. In the proposed network, several multi-level modulation methods such as QPSK, 16 QAM and 256 QAM are combined and applied to the access links in order to efficiently enlarge the system capacity within the 5 GHz frequency band. The accommodation number of user terminals and the width of the service area are theoretically analyzed considering the antenna directivity and the reuse number of identical frequency. Some numerical results show that the proposed architecture can obtain about 240 terminals improvement in the accommodation of user terminals and about 20% improvement in the radius of service area compared with conventional architecture where only the QPSK method is used
Keywords :
directive antennas; frequency allocation; microwave propagation; quadrature amplitude modulation; quadrature phase shift keying; radio access networks; radio links; 16 QAM; 256 QAM; 5 GHz; QPSK; SHF; access links; antenna directivity; frequency band; frequency reuse; multi-level modulation methods; propagation distance limitation; service area width; system capacity; transmission power; user terminals; wireless access networks architecture; Antennas and propagation; Costs; Frequency; IP networks; Internet; Quadrature phase shift keying; Receiving antennas; Transmitting antennas; Wireless LAN; Wireless networks;
Conference_Titel :
Radio and Wireless Conference, 2000. RAWCON 2000. 2000 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-6267-5
DOI :
10.1109/RAWCON.2000.880946
