Wireless Personal Communications: An International Journal
Effect of carrier-frequency offset on the performance of group-orthogonal multicarrier CDMA systems
Signal Processing - Special section: Multimodal human-computer interfaces
MC-CDMA systems with uplink and downlink receivers over fading channels
ICCOM'05 Proceedings of the 9th WSEAS International Conference on Communications
Multi-carrier transmission techniques for wireless communication systems: a survey
WSEAS TRANSACTIONS on COMMUNICATIONS
Performance increase through the use of multiple sub-carriers in WSN
Proceedings of the 7th ACM international symposium on Mobility management and wireless access
Impact of carrier frequency offsets on block-IFDMA systems
EURASIP Journal on Wireless Communications and Networking - Special issue on synchronization in wireless communications
International Journal of Communication Networks and Distributed Systems
Performance of multicarrier CDMA with dual spreading in Nakagami-m frequency offset fading channels
ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
Wireless Personal Communications: An International Journal
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In this paper, we study the sensitivity of uplink and downlink MC-DS-CDMA to carrier frequency offsets, assuming orthogonal spreading sequences. For both uplink and downlink MC-DS-CDMA, we show that the performance rapidly degrades for an increasing ratio of maximum frequency offset to carrier spacing. We point out that the degradation in the uplink is larger than in the downlink because only the former is affected by multiuser interference. For a given (small) ratio of maximum frequency offset to carrier spacing, enlarging the spreading factor in a fully loaded system does not affect the downlink degradation but strongly increases the uplink degradation. Finally, we show that the downlink degradations of MC-DS-CDMA and fully loaded MC-CDMA are the same, provided that for both systems the ratio of frequency offset to carrier spacing is the same