Journal ArticleDOI
A new joint algorithm of symbol timing recovery and sampling clock adjustment for OFDM systems
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TLDR
A new joint algorithm between symbol timing recovery and sampling clock adjustment is introduced using the difference of phase changes between the pilot carriers to address the effects of time synchronization errors on OFDM digital communications.Abstract:
This paper discusses the effects of time synchronization errors on OFDM (orthogonal frequency division multiplexing) digital communications. Time synchronization consists of symbol timing recovery and sampling clock adjustment. In general, symbol timing recovery is carried out before sampling clock adjustment. The main problem with time synchronization errors is that the sample rob/stuff phenomenon due to sampling clock frequency offset leads to adding the symbol timing offset. Thus a more efficient synchronization algorithm is required. This paper introduces a new joint algorithm between symbol timing recovery and sampling clock adjustment using the difference of phase changes between the pilot carriers. The performance of the proposed algorithm is carried out under AWGN and multipath fading channel.read more
Citations
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Journal ArticleDOI
OFDM and Its Wireless Applications: A Survey
TL;DR: This paper addresses basic OFDM and related modulations, as well as techniques to improve the performance of OFDM for wireless communications, including channel estimation and signal detection, time- and frequency-offset estimation and correction, peak-to-average power ratio reduction, and multiple-input-multiple-output (MIMO) techniques.
Journal ArticleDOI
On the synchronization techniques for wireless OFDM systems
TL;DR: The latest research works on the synchronization scheme for either continuous transmission mode or burst packet transmission mode for the wireless OFDM communications are overviewed and three improved methods for the fine symbol timing synchronization in frequency domain are proposed.
Journal ArticleDOI
Decision-directed fine synchronization in OFDM systems
TL;DR: The performance analysis and simulation results indicate that the proposed novel DD scheme achieves much better performance than the conventional pilot-based schemes in both additive white Gaussian noise and frequency-selective channels.
Journal ArticleDOI
Joint weighted least-squares estimation of carrier-frequency offset and timing offset for OFDM systems over multipath fading channels
TL;DR: Both analysis and simulation show that the weighted least-squares algorithm can effectively and accurately estimate the carrier-frequency offset as well as the timing offset of OFDM signals in multipath fading channels.
Book
OFDM Towards Fixed and Mobile Broadband Wireless Access
Uma Jha,Ramjee Prasad +1 more
TL;DR: In this article, the authors present the state of the art in broadband wireless access technology, presenting the fundamentals of OFDM(A) technology, and discuss important requirements, tradeoffs, and other critical design considerations, providing a full overview of the issues and possible solutions for your work in the field.
References
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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
Digital sound broadcasting to mobile receivers
TL;DR: The authors describe a system that combines the orthogonal frequency-division multiplexing technique and a coding strategy associated with diversity in the frequency domain that is suitable for digital broadcasting through a particularly hostile urban radio channel.
Proceedings ArticleDOI
The BER performance of OFDM systems using non-synchronized sampling
TL;DR: The BER degradation caused by a given frequency offset between receiver and transmitter clock, as compared with the case of ideal sampling, is calculated.
Journal Article
A Frequency and Timing Period Acquisition Technique for OFDM Systems
Hiroshi Nogami,Toshiro Nagashima +1 more
TL;DR: In this article, a frequency and timing period acquisition technique for orthogonal frequency division multiplexing (OFDM) systems is presented. Butler et al. introduced a pseudo-noise (PN) sequence to assign these frequencies of the pilot symbol so that the acquisition range can be widened for both additive white Gaussian noise (AWGN) and multipath fading channels.