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008 030926s2002 th uu|m rtt 0| a1eng d
035 _a.b11900143
099 9 _aAIT RSPR no.TC-02-15
100 0 _aNguyen Viet Hung
245 1 0 _aCombination of array processing and space-time code in MC-CDMA systems
260 _aBangkok :
_bAsian Institute of Technology,
_c2002
300 _a47 leaves
490 1 _aResearch studies project report ;
_vno. TC-02-15
502 _aSpecial Studies Project Report (M.Eng.) - Asian Institute of Technology, 2002
520 _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.
500 _aA research submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies
650 0 _aSpace and time
650 0 _aCode division multiple access
650 0 _aArray processors
700 1 _aFernando, W.A.C.,
_eChairperson
700 1 _aAhmed, Kazi Mohiuddin,
_eExamination Committee
700 1 _aErke, Tapio J.,
_eExamination Committee
710 2 _aVietnam Post and Telecommunications Corporation (VNPT),
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tResearch studies project report ;
_vno. TC-02-15
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B08017
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