Analyse Performance of Fractional Fourier Transform on Timing and Carrier Frequency Offsets Estimation
نویسنده
چکیده
This paper deals with the performance of the use of fractional Fourier transform (FRFT) instead of conventional Fourier transform (FFT) in either symbol timing offset (STO) and carrier frequency offset (CFO) estimation. Orthogonal frequency division multiplexing is widely used in many systems due to advantages of theses technique compared with mono-carrier systems. In spite of his advantages, OFDM presents drawbacks such as sensitivity to timing and frequency offsets. Many techniques are used in the literature to estimate these two parameters in order to compensate them (synchronization task). These techniques used conventional Fourier transform. In this paper, we are interested in estimating STO and CFO using fractional Fourier transform. Monte Carlo simulation demonstrates the performance of the use of FRFT instead of FFT.
منابع مشابه
Fractional Fourier Transform Based OFDMA for Doubly Dispersive Channels
The performance of Orthogonal Frequency Division Multiple Access (OFDMA) system degrades significantly in doubly dispersive channels. This is due to the fact that exponential sub-carriers do not match the singular functions of this type of channels. To solve this problem, we develop a system whose sub-carriers are chirp functions. This is equivalent to exploiting Fractional Fourier Transform (F...
متن کاملA Joint Timing Offset and Channel Estimation Using Fractional Fourier Transform and Cazac Sequences
This paper deals with symbol timing offset and channel estimation in OFDM (orthogonal frequency division multiplexing) system in fast varying channel. Symbol timing offset (STO) estimation is a major task in OFDM. Most of existing methods for estimating STO used cyclic prefix or training sequences. In this paper, we consider a new system for STO estimation using constant amplitude zero autocorr...
متن کاملDesign of Modified Timing Offset Estimation in OFDM for Maintaining Orthogonality
This paper deal with the symbol timing issue of an OFDM system in fast varying channel. Symbol timing offset (STO) estimation is a major task in OFDM. Most of existing methods for estimating STO used cyclic prefix or training sequences. In this paper, we consider a new system for STO estimation using constant amplitude zero auto-correlation (CAZAC) sequences as pilot sequences in conjunction wi...
متن کاملTime and Frequency Synchronisation in 4G OFDM Systems
This paper presents a complete synchronisation scheme of a baseband OFDM receiver for the currently designed 4G mobile communication system. Since the OFDM transmission is vulnerable to time and frequency offsets, accurate estimation of these parameters is one of the most important tasks of the OFDM receiver. In this paper, the design of a single OFDM synchronisation pilot symbol is introduced....
متن کاملFRFT Based Timing Estimation Method for an OFDM System
The Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation (MCM) technique which is adopted by many wireless communication standards for transmitting data at very high rates over time dispersive radio channels. In an OFDM system, the timing estimation is extremely important for maintaining orthogonality among the subcarriers. In this paper, a method of timing estimation...
متن کامل