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Ant-Colony-Optimization Based Multiuser Detection for MC-CDMA Systems

Author: ZhangYuSen
Tutor: ZuoYingZi
School: Xi'an University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Multicarrier CDMA Frequency domain diversity combining Multi-user detection Ant Colony Algorithm
CLC: TN929.533
Type: Master's thesis
Year: 2011
Downloads: 27
Quote: 0
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Abstract


With the further integration of the mobile communications and Internet technologies as well as the rapid development of multimedia information applications , multi-carrier technology because of its natural advantages to improve spectral efficiency, resistance to frequency selective fading , and support a variety of different business , is gaining Vietnam to more concern . OFDM for multi-carrier technology has become one of the core technologies of the fourth generation of mobile communication . CDMA is the 3G a practical communication scheme . The combination of OFDM and CDMA , MC-CDMA both the both advantages of OFDM and CDMA communication system is a promising program . MC-CDMA system is an interference-limited system , so when a greater number of users in the system , multiple access interference (Multiple-access Interference, MAI) will be the main factors to affect system performance , but also seriously reduce system capacity. Therefore , the multi-user detection technology to become one of the key technologies of the MC-CDMA system performance and decided that the system can work . This paper first introduces the principle of OFDM , as well as several multi-carrier CDMA communication scheme , detailed analysis and comparison , and the variety of programs focusing on the MC-CDMA scheme , given its uplink and downlink mathematical model . Then elaborated downlink single-user detection for MC-CDMA systems in several frequency domain sub- collections and programs, and simulation and comparative analysis . Secondly, the MC-CDMA system uplink multi-user detection methods , including optimal multiuser detection and a variety of sub-optimal multiuser detection methods , and detailed analysis algorithms and characteristics of the various methods and simulation. Combined with the characteristics of the MC-CDMA uplink multi-user detection problem , given the ant colony algorithm for MC-CDMA system model , the application of the algorithm has been improved on the basis of this model , the simulation proved reasonable selection algorithm parameters ant colony algorithm can get close to the optimal performance of multi-user detection , rather than its complexity optimal multiuser detection greatly reduced .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication
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