A study on novel transmit architectures in MIMO channel sounding systemMIMO 채널 사운딩 시스템에서 송신 안테나 멀티플렉싱에 관한 새로운 구조 제안

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It is anticipated that MIMO systems will play an important role in increasing spectrum efficiency and link reliability in the next generation wireless communication systems. As researches about MIMO systems are going on at a good pace, the need for studying MIMO radio channel has also been increased largely. Because MIMO wireless channel has spatially directional property unlike SISO channel, accurate field measurement of MIMO channel is required for analyzing MIMO channel and evaluating MIMO communication systems. A conventional channel sounder for measuring MIMO radio channel is based on time division multiplexing (TDM) using pseudo noise (PN) sequence as a pilot sequence and can measure the MIMO channel accurately in slow fading environment. However this sounder has a big drawback that the accuracy of channel measurement is degraded largely in fast fading environment. To overcome this limitation, channel sounding architecture based on code division multiplexing (CDM) has already proposed, but the sequences for a sounding code was not presented until now. In this thesis, we propose three different sequences with a very lowcorrelation property for CDM based MIMO channel sounder: Loosely Synchronous (LS) code, Kasami, and Chaotic sequences. To demonstrate the validity of each code, we experimented through computer simulations, and we concluded that LS code is the most suitable as a sounding code for CDM architecture. And for the case that CDM architecture represents some limitation of measurements because of large interferences according to the increase of transmitting sequences, we proposed CDM-TDM Hybrid architecture. From the analysis through simulation, we can find that the Hybrid architecture outperforms CDM and TDM in all different channel variation environments. Finally, we can conclude that LS code is the most appropriate code for CDM architecture and in situation where LS code represents bad performance with CDM architecture, MIMO channel measureme...
Advisors
Lee, Hyuck-Jaeresearcher이혁재researcher
Description
한국정보통신대학교 : 공학부,
Publisher
한국정보통신대학교
Issue Date
2008
Identifier
392891/225023 / 020054653
Language
eng
Description

학위논문(석사) - 한국정보통신대학교 : 공학부, 2008.2, [ vii, 48 p. ]

Keywords

Kasami sequences; Loosely Synchronous code; CDM; MIMO Channel Sounder; Chaotic sequences; 케이아틱 시퀀스; 카사미 시퀀스; LS 코드; 코드 분할 멀티플렉싱; MIMO 채널 사운더

URI
http://hdl.handle.net/10203/54901
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=392891&flag=dissertation
Appears in Collection
School of Engineering-Theses_Master(공학부 석사논문)
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