期刊名称：International Journal of Advanced Research in Computer Engineering & Technology (IJARCET)
印刷版ISSN：2278-1323
出版年度：2015
卷号：4
期号：2
页码：284-287
出版社：Shri Pannalal Research Institute of Technolgy
摘要：Present scenario of wireless communications channels are time varying or frequency selective especially for broadband and mobile applications. To address these challenges, a promising combination has been exploited, MIMO with OFDM, which has already been adopted such as LTE or WiMax, WLAN. With the constant demand of hig h spectral efficiency and high transmission speed for audio, video and internet applications, MIMO -OFDM has become the most promising technology combination for present and future wireless communications. MIMO offers spatial diversity and increase the capacity while OFDM allow systems to work in time varying or frequency selective environment. The aim of this research is to propose iterative dynamic channel estimation and signal detection techniques for MIMO-OFDM systems for fixed and mobile communications. A joint iterative scheme will be proposed for STBC-OFDM systems using orthogonal STBC at pilot subcarriers for dynamic channel estimation and this scheme will be extended for SFBC-OFDM with SFBC used for pilots. To take the advantage of the three dimensions offered by MIMO-OFDM; space, time and frequency, this research will also adapt the proposed dynamic channel estimation method to mixed STBC and SFBC MIMO-OFDM systems with pilot and data subcarriers being coded by different STBC and SFBC respectively. D ue to the orthogonality of STBC and SFBC, both channel estimation and data detection become simple, as no computational intensive matrix inversion is needed.
