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A Blind Estimation Algorithm on Cyclic Prefix of OFDM Signals Based on Correlation

Tang Xin-guan

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Abstract

To solve the problem that the length of cyclic prefix(CP) in OFDM monitor system can not be known in advance,a method for guard interval estimation which is based on CP cycle correlation is put forward.Utilizing the quasi-periodicity of OFDM signal in time domain,it can achieve accurate estimation of FFT time length and period of guard interval and symbol synchronization.The results show that the new algorithm without prior information has lower computational complexity and more accurate estimation,and is suitable for hardware implementation.

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What this paper is about

To solve the problem that the length of cyclic prefix(CP) in OFDM monitor system can not be known in advance,a method for guard interval estimation which is based on CP cycle correlation is put forward.Utilizing the quasi-periodicity of OFDM signal in time domain,it can achieve accurate estimation of FFT time length and period of guard interval and symbol synchronization.The results show that the new algorithm without prior information has lower computational complexity and more accurate estimation,and is suitable for hardware implementation.

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Available abstract

To solve the problem that the length of cyclic prefix(CP) in OFDM monitor system can not be known in advance,a method for guard interval estimation which is based on CP cycle correlation is put forward.Utilizing the quasi-periodicity of OFDM signal in time domain,it can achieve accurate estimation of FFT time length and period of guard interval and symbol synchronization.The results show that the new algorithm without prior information has lower computational complexity and more accurate estimation,and is suitable for hardware implementation.

Key concepts: Cyclic prefix, Guard interval, Orthogonal frequency-division multiplexing, Algorithm, Synchronization (alternating current), Fast Fourier transform, Guard (computer science), Computer science

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