Symbol time offset estimation in coherent OFDM systems

Landström, Daniel; Wilson, Sarah Kate; Beek, Jaap van de; Ödling, Per; Börjesson, Per Ola

doi:10.1109/26.996067

Cited by 77 publications

(11 citation statements)

References 4 publications

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“…The most classical algorithm of non-pilot aided method is the maximum likelihood (ML) algorithm based on cyclic prefix (CP) proposed by Beek in [8], but it only has good performance in the additive white Gaussian noise (AWGN) channel in CFO estimation. Then, Landstorm et al [9] proposed joint STO and CFO estimation by effectively combining CP and pilot, which can estimate frequency offset effectively in multi-path channel. Due to additional training symbols are added, the pilot aided method has good estimation performance in multi-path channel.…”

Section: Background Knowledgementioning

confidence: 99%

A novel timing and frequency offset estimation algorithm for filtered OFDM system

Feng

Wang

Chen³

et al. 2020

EURASIP J. Adv. Signal Process.

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As a critical technology of 5G air interface waveform, filtered orthogonal frequency division multiplexing (F-OFDM) not only inherits the technical advantages of OFDM, but also has outstanding advantages in system flexibility and spectrum efficiency. However, as a multi-carrier technology, it is still extremely sensitive to sample timing offset (STO) and carrier frequency offset (CFO). In this letter, an improved Park frequency domain training sequence (FS-Park) is proposed to complete STO and CFO estimation of F-OFDM system. Firstly, a real-value pseudorandom number (PN) sequence is sent to each subcarrier as training sequence in frequency domain, the corresponding time domain training symbol has a conjugate symmetry structure. Secondly, the training symbol is utilized for timing synchronization, then the fractional frequency offset is estimated based on the cyclic prefix in time domain. Finally, the integer frequency offset is estimated in frequency domain based on the auto-correlation of PN sequence. The simulation results illustrate that the FS-Park algorithm not only has a single pulse timing metric curve and great STO estimation accuracy, but also has better performance of CFO estimation than classical Park algorithm and Liang Xiao's method.

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Section: Background Knowledgementioning

confidence: 99%

A novel timing and frequency offset estimation algorithm for filtered OFDM system

Feng

Wang

Chen³

et al. 2020

EURASIP J. Adv. Signal Process.

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“…This results in inter-OFDM symbol interference leading to BER degradation [6]. The requirements on the time offset estimator are determined by the difference in length between the cyclic prefix (CP) and the channel impulse response (CIR) [5]. This difference is the part of the cyclic prefix that is not affected by the previous symbol due to the channel dispersion, as shown in Figure 1.As long as a symbol time offset estimate does not exceed this difference, the orthogonality of the subcarriers is preserved, and a time offset within this interval only results in a phase rotation of the subcarrier constellations.…”

Section: Timing Error Estimationmentioning

confidence: 99%

New Efficient Timing and Frequency Error Estimation In OFDM

Rathkanthiwar¹,

Gandhi

2014

JCSM

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Orthogonal frequency division multiplexing (OFDM) technique is being applied extensively to high data rate digital transmission as it is a bandwidth efficient modulation scheme. In OFDM system, intersymbol interference (ISI) and intercarrier interference (ICI) occur due to synchronization errors. Fast, simple and robust synchronization algorithms are necessary for OFDM systems. In OFDM downlink transmission, every terminal perform synchronization by exploiting reference symbols called training symbols of received frame. In this paper we are presenting very simple method of synchronization which uses training symbol to determine timing and frequency synchronization error. Proposed synchronization techniques result in better performance with respect to all the parameters despite being simple.

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“…And such fluctuation will have the significant influence on the carrier frequency offset as well as the sampling clock offset estimation in frequency domain. To improve the performance of ML Estimator, a novel scheme utilizing both CP and pilots to do the coarse symbol timing synchronization was proposed by D. Landström [8]. It has better performance compared to that of [7] under the multi-path fading channel.…”

Section: A the Coarse Symbol Timing Algorithms In Continuous Modementioning

confidence: 99%

On the Synchronization Techniques for Wireless OFDM Systems

Yang

Chen

et al. 2006

IEEE Trans. on Broadcast.

139

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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 in this paper. The typical algorithms dealing with the symbol timing synchronization, the carrier frequency synchronization as well as the sampling clock synchronization are briefly introduced and analyzed. Three improved methods for the fine symbol timing synchronization in frequency domain are also proposed, with several key issues on the synchronization for the OFDM systems discussed.

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Symbol time offset estimation in coherent OFDM systems

Cited by 77 publications

References 4 publications

A novel timing and frequency offset estimation algorithm for filtered OFDM system

A novel timing and frequency offset estimation algorithm for filtered OFDM system

New Efficient Timing and Frequency Error Estimation In OFDM

On the Synchronization Techniques for Wireless OFDM Systems

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