Proceedings ArticleDOI
A novel method for blind frequency offset correction in an OFDM system
Matthijs A. Visser,Pingping Zong,Yeheskel Bar-Ness +2 more
- Vol. 2, pp 816-820
TLDR
A blind method using the correlation of the samples at the output of the discrete Fourier transform (DFT) to estimate and correct the frequency offset is proposed and an adaptive algorithm for the Frequency offset correction is developed.Abstract:
Orthogonal frequency division multiplexing (OFDM) is believed to be an important technique for future wireline and wireless communications. One of the major disadvantages of such a multi-carrier modulation is the sensitivity of the performance to a frequency offset. The frequency offset can result from a Doppler shift due to mobile movement as well as from a carrier frequency synchronization error. Such a frequency offset causes a loss of the carriers' orthogonality, and hence inter-carrier interference (ICI). A previously proposed method to estimate and correct the frequency offset uses the retransmission of a data symbol, thus reducing the bandwidth efficiency. Another method, which merely reduces the effects of the ICI instead of completely correcting for effects of the frequency offset is based on repetition coding in the frequency domain, hence also reducing the throughput. In this paper, we propose a blind method using the correlation of the samples at the output of the discrete Fourier transform (DFT) to estimate the frequency offset. As no training sequence or symbol retransmission is required there is no loss in bandwidth efficiency. Additionally, we develop an adaptive algorithm for the frequency offset correction. The derived algorithm is basically a stochastic gradient algorithm which minimizes the mean squared frequency offset error.read more
Citations
More filters
Journal ArticleDOI
OFDM systems in the presence of phase noise: consequences and solutions
Songping Wu,Yeheskel Bar-Ness +1 more
TL;DR: An exact analysis of orthogonal frequency-division multiplexing (OFDM) performance in the presence of phase noise and a general phase-noise suppression scheme which, by analytical and numerical results, proves to be quite effective in practice.
Journal ArticleDOI
Phase Noise Estimation and Mitigation for OFDM Systems
S. Wu,P. Liu,Yeheskel Bar-Ness +2 more
TL;DR: A new parametric model of OFDM signals is proposed in this paper which shows that, in the presence of phase noise, each received frequency-domain subcarrier signal can be expressed as a sum of all sub carrier signals weighted by a vector parameter.
Proceedings ArticleDOI
Multiuser interference cancellation receivers for OFDMA uplink communications with carrier frequency offset
TL;DR: Simulation results show that it is possible to achieve a performance close to the ideal case, i.e., without frequency offset among users in an OFDMA uplink system with a frequency selective Rayleigh fading channel.
Proceedings ArticleDOI
OFDM channel estimation in the presence of frequency offset and phase noise
Songping Wu,Yeheskel Bar-Ness +1 more
TL;DR: This paper iteratively search for the most likely channel impulse response (CIR) length, and uses it not only for the optimum compensation of frequency offset, but also for finding the optimum window to filter the least square channel estimate which further suppress the effects of ICI and noise.
References
More filters
Journal ArticleDOI
Multicarrier modulation for data transmission: an idea whose time has come
TL;DR: The general technique of parallel transmission on many carriers, called multicarrier modulation (MCM), is explained, and the performance that can be achieved on an undistorted channel and algorithms for achieving that performance are discussed.
Journal ArticleDOI
Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing
TL;DR: The analysis and simulation of a technique for combating the effects of multipath propagation and cochannel interference on a narrow-band digital mobile channel using the discrete Fourier transform to orthogonally frequency multiplex many narrow subchannels, each signaling at a very low rate, into one high-rate channel is discussed.
Journal ArticleDOI
Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform
Stephen B. Weinstein,P. Ebert +1 more
TL;DR: The Fourier transform data communication system is described and the effects of linear channel distortion are investigated and a differential phase modulation scheme is presented that obviates any equalization.
Journal ArticleDOI
A technique for orthogonal frequency division multiplexing frequency offset correction
TL;DR: It is shown, and confirmed by simulation, that to maintain signal-to-interference ratios of 20 dB or greater for the OFDM carriers, offset is limited to 4% or less of the intercarrier spacing.
Journal ArticleDOI
BER sensitivity of OFDM systems to carrier frequency offset and Wiener phase noise
TL;DR: In this contribution the transmission of M-PSK and M-QAM modulated orthogonal frequency division multiplexed (OFDM) signals over an additive white Gaussian noise (AWGN) channel is considered and the degradation of the bit error rate is evaluated.