Frequency and Symbol Timing offset Estimation Method for CP-OFDM based System

Jung, Yongju; Byun, Sang-Bong; Shin, Han-Jae; Han, Dong; Cho, Soo-Hyun; Lee, Sung-Hun

doi:10.1109/ictc52510.2021.9621185

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…In 2021, Guo et al [ 18 ] proposed a novel 5G-based centralized switch fault current limiter framework as well as a method to allocate such flexible fault current limiters optimally. In the same year, Jung et al [ 19 ] proposed a simple method for estimating STO and fractional CFO in cyclic prefix (CP) OFDM-based systems. A CP-based correlation function was proposed in the pre-fast Fourier transform (FFT) synchronization to avoid the effects of ISI, which are caused by multipath fading channels, and the effects of ICI, which are caused by the performance differences in local oscillators between the transmitter and the receiver.…”

Section: Related Workmentioning

confidence: 99%

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Peng

et al. 2023

Sensors

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Since orthogonal frequency division multiplexing (OFDM) systems are very susceptible to symbol timing offset (STO) and carrier frequency offset (CFO), which cause inter-symbol interference (ISI) and inter-carrier interference (ICI), accurate STO and CFO estimations are very important. In this study, first, a new preamble structure based on the Zadoff–Chu (ZC) sequences was designed. On this basis, we proposed a new timing synchronization algorithm, called the continuous correlation peak detection (CCPD) algorithm, and its improved algorithm: the accumulated correlation peak detection (ACPD) algorithm. Next, the correlation peaks that were obtained during the timing synchronization were used for the frequency offset estimation. For this, the quadratic interpolation algorithm was adopted as the frequency offset estimation algorithm, which was better than the fast Fourier transform (FFT) algorithm. The simulation results showed that when the correct timing probability reached 100%, under the parameters of m = 8 and N = 512, the performance of the CCPD algorithm was 4 dB higher than that of Du’s algorithm, and that of the ACPD algorithm was 7 dB. Under the same parameters, the quadratic interpolation algorithm also had a great performance improvement in both small and large frequency offsets, when compared with the FFT algorithm.

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Section: Related Workmentioning

confidence: 99%

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Peng

et al. 2023

Sensors

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“…The CFO impact on the OFDM performance has been known for a long time from the first IEEE 802.11a OFDM systems. Many different solutions and schemes for CFO compensation have been proposed and studied for more than 25 years [3] [11]. In our paper, we will focus on the consideration of the additional CFO compensation block for slotby-slot signal processing in the time domain, which includes a combination of two relatively simple CFO estimation algorithms.…”

Section: Cyclic-prefix Based сFo Compensationmentioning

confidence: 99%

Performance Analysis of 256-QAM Demodulation for 5G NR Sidelink

Maltsev

Serunin²,

Pudeev³

et al. 2022

Frontiers in Artificial Intelligence and Applications

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Higher order modulations are the key elements to the throughput and spectral efficiency increase, especially important for the limited bandwidth scenarios. In this paper, we present a detailed analysis of the 256-QAM signal demodulation performance for the novel sidelink (SL) mode of the 5G NR communication systems. The performance is frequency offset (CFO). It was shown that the CFO has critical impact on the system performance, along with channel mobility. The simple and effective CFO studied in the non-stationary, frequency selective channel in the presence of the carrier compensation algorithm based on the slot-by-slot time-domain signal processing is proposed and investigated. Obtained simulation results have shown the feasibility of the 256-QAM modulation in applications to the main 3GPP sidelink scenarios and parameters, with the proposed CFO compensation method applied even in the case of significant user mobility.

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“…CP length should be chosen longer than the maximum delay spread of the channel in order to avoid ISI. In studies where additional structures are not used, the correlation of the CP is generally employed [7,8]. However, the performance of these methods is lower than the preamble-based algorithms which are used in most communication standards.…”

Section: Introductionmentioning

confidence: 99%

Preamble-Based Symbol Timing Algorithms in OFDM Systems

Yağlı

Aldırmaz-Çolak

2022

EJRnD

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In orthogonal frequency division multiplexing (OFDM) systems, a preamble is added at the start of the OFDM data frame in order to find the correct frame starting point. In the receiver, the symbol starting point is estimated by a correlation-based timing metric that uses the periodic properties of the preamble. In this study, a novel preamble structure using the constant amplitude zero autocorrelation (CAZAC) sequence is proposed. The performance of the timing synchronization algorithms has been compared with the proposed method in terms of mean squared error (MSE). The simulations are performed under additive white Gaussian noise (AWGN) and Rayleigh multipath fading channels. The simulation results indicate that our proposed method provides better timing MSE performance for the low signal-to-noise ratio (SNR) values.

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Frequency and Symbol Timing offset Estimation Method for CP-OFDM based System

Cited by 7 publications

References 5 publications

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Timing and Frequency Synchronization Using CAZAC Sequences for OFDM Systems

Performance Analysis of 256-QAM Demodulation for 5G NR Sidelink

Preamble-Based Symbol Timing Algorithms in OFDM Systems

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