期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2012
卷号：2
期号：8
出版社：S.S. Mishra
摘要：The challenge of transmit diversity design for the multiple-antenna fading channel has been met with several novel modulation and error correction techniques in the recent past. Space-time block codes operate on a block of input symbols producing a matrix output over antennas and time. Unlike traditional single-antenna AWGN block codes, full rate space-time block codes do not provide coding gain. Their key feature is the provision of full diversity with extremely low encoder/decoder complexity. In this paper we discuss modulation technique of OFDM in multiple channel diversity. The variable length modulation index of carrier signal is encoded with channel interference and reduction of noise. This paper proposes a compromise between STBC (known designs, simple ML (maximum likelihood) decoding, no coding gain) and OFDM (difficult to design, expensive ML decoding, coding gain). We concatenate AWGN with STBC in order to obtain coding gain. Then we compare the performance of concatenated STBC with fading by keeping transmit power and spectral efficiency fixed
