Post coded OFDM systems with SVM detector

May 5th, 2015
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Orthogonal Frequency Division Multiplexing (OFDM) is well known as a highly spectral efficient transmission scheme capable of dealing with severe channel impairments encountered in mobile environment. This paper discusses the design and analysis of post coded OFDM (PC-OFDM) systems.

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Post coded OFDM systems with SVM detectorPost coded OFDM systems with SVM detector S.Madhuranthagi*,M.S.Karthikeyan*,S.Brahadeesh*,S.Kartik*,N.S.Vignesh*,N.Kathiresan*,P.Sudheesh# * Student,Department of ECE,Amrita Vishwa Vidyapeetham,Ettimadai,Coimbatore-641105 #Assistant Professor, Department of ECE,Amrita Vishwa Vidyapeetham,Ettimadai,Coimbatore-641105 Abstract Orthogonal Frequency Division Multiplexing (OFDM) is well known as a highly spectral efficient transmission scheme capable of dealing with severe channel impairments encountered in mobile environment. This paper discusses the design and analysis of post coded OFDM (PC-OFDM) systems. We show that PC- OFDM systems are a special case of precoded OFDM systems that offer advantageous complexity-performance trade-offs to overcome the symbol recovery problem in uncoded OFDM systems. In particular, PC-OFDM systems introduce frequency diversity by manipulating the OFDM symbols in the time domain so that the computational complexity of the system can be significantly reduced. We discuss the design principles of PC-OFDM transmitter that uses upsampling operation and the spreading codes to introduce frequency diversity. We also describe the design of low-complexity receiver for PC-OFDM systems. SVM detector is used for high performance.Keywords Orthogonal frequency division multiplexing (OFDM), precoding, post-coding, spreading codes, frequency diversity, pulsed OFDM, coding gain, diversity gain. IntroductionOrtho

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