02962cas|a2200265 a 450000500170000000800410001703500150005810000210007324500750009426000520016930000140022149000520023550200820028752017550036950001410212465000190226565000340228465000210231870000350233970000500237470000430242471000800246781000840254785600650263120260817173149.0030926s2002    th uu|m rtt   0|  a1eng d  a.b119001430 aNguyen Viet Hung10aCombination of array processing and space-time code in MC-CDMA systems  aBangkok :bAsian Institute of Technology,c2002  a47 leaves1 aResearch studies project report ;vno. TC-02-15  aSpecial Studies Project Report (M.Eng.) - Asian Institute of Technology, 2002  aReducing decoding complexity by combining array processing and space-time codes (STC) helps a communication system using STC to overcome a big obstacle that prevents it from achieving a desired transmission rate. Multi-carrier CDMA (MC-CDMA) is a combination of multi-user access of CDMA and multi-carrier modulation techniques, which allows providing good performance in a channel with high inter-symbol interference. In addition to that, antenna airny, STC and MC-CDMA system have a similar characteristic that transmit-receive data streams are divided into sub-streams. Thus, there may be a noticeable reduction of receiver complexity when we combine them together. In this research study, the combination of array processing and STC in MC-CDMA system over slow selective-fading channel is investigated and compared with corresponding existing MC-CDMA system using STC. Performance comparisons are made in different channel conditions as well as in different transmission rates. All the data are calculated and compared with corresponding simulation parameters in (Maitree, 2000). Simulation results show that combining array processing and STC can provide higher data rate (2 times) while reducing decoding complexity (16 times). However, there is a penalty to be paid for simplified decoding, especially in multipath fading channel. The serious performance degradation is about 10 dB at FER of 0.01 at both the same data transmission rate and double data transmission rate over multipath fading channel in the case of single user system. However, for an A WGN channel combining array processing and STC with 2-STCM shows a negligible degradation (about 1 dB at FER of 0.001) compared with 4-STCM for both single user system and multiuser system.  aA research submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies 0aSpace and time 0aCode division multiple access 0aArray processors1 aFernando, W.A.C.,eChairperson1 aAhmed, Kazi Mohiuddin,eExamination Committee1 aErke, Tapio J.,eExamination Committee2 aVietnam Post and Telecommunications Corporation (VNPT), eScholarship Donor2 aAsian Institute of Technology.tResearch studies project report ;vno. TC-02-15  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B08017