Proceedings ArticleDOI
Space time spreading in forward links of the multicarrier DS CDMA system
Jianjun Li,Pingyi Fan,Zhigang Cao +2 more
- Vol. 2, pp 285-290
TLDR
The numerical results show that considerable performance gain can be obtained by transmit diversity when the active user number is relatively small, but as the number of the users increases, the diversity gain will decrease.Abstract:
In this paper, we consider space time spreading in the forward links of a MC-DS-CDMA system when random signature sequences are used. The performance of the system with different diversity order has also been analyzed. The numerical results show that considerable performance gain can be obtained by transmit diversity when the active user number is relatively small. As the number of the users increases, the diversity gain will decrease. It also suggests that it require multiuser interference cancellation when the active user number is relatively large.read more
Citations
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References
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Journal ArticleDOI
A simple transmit diversity technique for wireless communications
TL;DR: This paper presents a simple two-branch transmit diversity scheme that provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas.
Journal ArticleDOI
Space-time codes for high data rate wireless communication: performance criterion and code construction
TL;DR: In this paper, the authors consider the design of channel codes for improving the data rate and/or the reliability of communications over fading channels using multiple transmit antennas and derive performance criteria for designing such codes under the assumption that the fading is slow and frequency nonselective.
Journal ArticleDOI
Space-time processing for wireless communications
TL;DR: This article focuses largely on the receive (mobile-to-base station) time-division multiple access (TDMA) (nonspread modulation) application for high-mobility networks and describes a large cell propagation channel and develops a signal model incorporating channel effects.
Journal ArticleDOI
Performance of multicarrier DS CDMA systems
S. Kondo,B. Milstein +1 more
TL;DR: This paper applies a multicarrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multiple carriers, rather than a single carrier.
Journal ArticleDOI
Performance of orthogonal multi-carrier CDMA in a multipath fading channel
Essam Sourour,M. Nakagawa +1 more
TL;DR: It is shown that the DS-CDMA multi-carrier system over-performs the RAKE receiver when the system parameters are selected properly and the spread spectrum processing gain is increased, the effect of multipath interference is removed, and frequency/time diversity is achieved.