Title :
Performance of Orthogonal Uplink Multiple Access for Beyond 3G/4G Systems
Author_Institution :
Wireless Solutions Lab., Samsung Telecommun. America, Richardson, TX
Abstract :
The uplink access in the current 3G systems optimized primarily for voice applications is based on CDMA technology. The uplink transmissions in CDMA are non-orthogonal due to different propagation delays for signals received from different mobile station in the cell. Therefore, the users experience large amount of intra-cell interference in addition to the inter-cell interference. This limits the achievable data rates and capacity in a CDMA uplink In this paper, we explore potential capacity and performance benefits due to orthogonal multiple access schemes such as TDMA OFDMA and IFDMA for future beyond 3G/4G wireless systems. An orthogonal approach eliminates intra-cell interference and allows users to transmit at very high data rates without tight requirement on power control resulting in overall higher spectral efficiency.
Keywords :
3G mobile communication; 4G mobile communication; code division multiple access; mobile radio; radio links; 3G systems; CDMA technology; code division multiple access; intercell interference; mobile station; orthogonal uplink multiple access; propagation delays; voice applications; Base stations; Code division multiplexing; Downlink; Interference constraints; Interference elimination; Laboratories; Multiaccess communication; Propagation delay; Time division multiple access; Working environment noise;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.137
