?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fwww.eledia.org%2Fstudents-reports%2F400%2F&rft.title=Genetic+Algorithm-assisted+Maximum-Likelihood+Multi-user+Detection+for+Multi-Rate+MC-CDMA+Systems&rft.creator=Sacchi%2C+Claudio&rft.creator=D'Orazio%2C+Leandro&rft.creator=Donelli%2C+Massimo&rft.creator=Fedrizzi%2C+Riccardo&rft.creator=Massa%2C+Andrea&rft.subject=TU+Technical+Reports+and+Publications&rft.description=In+this+letter+%2C+the+use+of+Genetic+Algorithms+(GAs)+has+been+investigated+in+order+to+implement+a+computationally+tractable+Multi-User+Detection+(MUD)+for+synchronous+multi-rate+Multi-Carrier-Code-Division-Multiple-Access+(MR+MC-CDMA)+systems.+It+is+known+that+MC-CDMA+performances+can+be+seriously+limited+by+multi-user+interference.+This+is+particularly+true+in+the+case+of+multi-rate+systems+where+some+users+could+exploit+a+reduced+diversity+against+multipath+channel+distortions.+The+use+of+Genetic+Algorithms+(GAs)+is+therefore+proposed+as+a+sub-optimal+solution+to+the+MUD+problem+in+a+multi-rate+Variable-Spreading-Length+(VSL)+MC-CDMA+downlink+transmission.+A+set+of+selected+numerical+experiments+have+been+reported+and+discussed+in+order+to+assess+the+capability+of+the+proposed+GA-based+approach.+The+reported+results%2C+obtained+with+an+affordable+computational+burden%2C+have+shown+a+near-optimum+behavior+of+the+proposed+GA-based+MUD.&rft.date=2007-03&rft.type=Technical+Report&rft.type=NonPeerReviewed&rft.format=text&rft.language=en&rft.identifier=http%3A%2F%2Fwww.eledia.org%2Fstudents-reports%2F400%2F1%2FDIT-07-008.pdf&rft.identifier=++Sacchi%2C+Claudio+and+D'Orazio%2C+Leandro+and+Donelli%2C+Massimo+and+Fedrizzi%2C+Riccardo+and+Massa%2C+Andrea++(2007)+Genetic+Algorithm-assisted+Maximum-Likelihood+Multi-user+Detection+for+Multi-Rate+MC-CDMA+Systems.++%5BTechnical+Report%5D++++(Submitted)++