scholarly journals Zero-Forcing and Minimum Mean-Square Error Multiuser Detection in Generalized Multicarrier DS-CDMA Systems for Cognitive Radio

2007 ◽  
Vol 2008 (1) ◽  
Author(s):  
Lie-Liang Yang ◽  
Li-Chun Wang
Keyword(s):  
Cognitive Radio ◽  
Mean Square Error ◽  
Multiuser Detection ◽  
Minimum Mean Square Error ◽  
Mean Square ◽  
Zero Forcing ◽  
Cdma Systems

scholarly journals Improved Signal Detection Techniques for QOSTBC System in Fast Fading Channel

2020 ◽  
Vol 1 ◽  
pp. 6-12
Author(s):  
Jyoti P. Patra ◽  
Poonam Singh
Keyword(s):  
Signal Detection ◽  
Mean Square Error ◽  
Minimum Mean Square Error ◽  
Decision Feedback ◽  
Decision Feedback Equalizer ◽  
Mean Square ◽  
Zero Forcing ◽  
Decision Feedback Equalization ◽  
Interference Cancelation ◽  
Detection Schemes

Most existing quasi-orthogonal space time Block coding (QO-STBC) schemes have been developed relying on the assumption that the channel is at or remains static during the length of the code word symbol periods to achieve an optimal antenna diversity gain. However, in time-selective fading channels, this assumption does not hold and causes intertransmit-antenna-interferences (ITAI). Therefore, the simple pairwise maximum likelihood decoding scheme is not sufficient to recover original transmitted signals at the receiver side. To avoid the interferences, we have analyzed several signal detection schemes, namely zero forcing (ZF), two-step zero forcing (TS-ZF), minimum mean square error (MMSE), zero forcing - interference cancelation - decision feedback equalizer (ZF-IC-DFE) and minimum mean square error - interference cancelation { decision feedback equalizer (MMSE-IC-DFE). We have proposed two efficient iterative signal detection schemes, namely zero forcing - iterative interference cancelation - zero forcing { decision feedback equalization (ZF-IIC-ZF-DFE) and minimum mean square error - parallel interference cancelation - zero forcing – decision feedback equalization (MMSE-IIC-ZF-DFE). The simulation results show that these two proposed detection schemes significantly outperform all conventional methods for QOSTBC system over time selective channel.

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