Timing recovery for OFDM transmission

Yang, Bin; Letaief, Khaled B.; Cheng, R.S.; Cao, Zhigang

doi:10.1109/49.895033

Cited by 240 publications

(42 citation statements)

References 12 publications

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“…Afterward, the fine stage refines the timing estimation and tracks any variation. Many methods for timing synchronization can be used, such as the classic early-late gate, which underlying idea can be performed in the frequency domain [6]. In this paper, we propose a simple computational frequency domain technique which can almost attain the MCRB for small roll-off values and has no self-noise.…”

Section: The Frequency Domain Timing Techniquementioning

confidence: 99%

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A frequency domain approach for non-coherent timing chip-level synchronization for cdma systems

Panazio

2007

2007 IEEE 8th Workshop on Signal Processing Advances in Wireless Communications

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In this paper, we propose a simple computational chip-level non-coherent timing synchronization technique operating in the frequency domain. The proposed technique almost attains the modified Cramér-Rao bound when the system operates with small roll-off values of the transmitter/receiver filters. Furthermore, the frequency domain processing allows to easily mitigate the noxious effect of strong narrowband interference. The proposed method is discussed and analyzed. We provide some analytical and numerical results to show its effectiveness.

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Section: The Frequency Domain Timing Techniquementioning

confidence: 99%

“…The enhanced technique needs additional K − 2 real multiplications. For comparison, an equivalent frequency domain early-late gate technique proposed in [6] for OFDM but that can be adapted for CDMA needs 2K + 2 complex multiplications and K real summations.…”

Section: Computational Costmentioning

confidence: 99%

A frequency domain approach for non-coherent timing chip-level synchronization for cdma systems

Panazio

2007

2007 IEEE 8th Workshop on Signal Processing Advances in Wireless Communications

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“…Sampling frequency synchronization methods for OFDM systems proposed in the literature are mainly based on frequency domain pilots, e.g. [9], [10]. Nevertheless, the joint frame and sampling frequency synchronization method proposed in [11] is carried out in time domain, which is applicable to block transmission systems with fixed training sequence as guard intervals.…”

Section: Introductionmentioning

confidence: 99%

Joint Synchronization Using Cyclic Property

Peng

Yang

2009

2009 IEEE International Conference on Communications

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It is well known that the cyclic property of transmitted signal can be used to achieve joint frame and carrier frequency synchronization, while the uncompensated sampling frequency offset (SFO) would still be a problem. Based on the observation that the impact of SFO on the received cyclic block and its replica is equivalent to a relative time shift, a joint synchronization scheme solely based on cyclic property is proposed to achieve frame, sampling frequency and carrier frequency synchronization simultaneously. A two-Dimensional Sliding-Window Auto-Correlator (2D-SWAC) is presented to implement the joint synchronization with low complexity. The proposed scheme is suitable for any transmission system with similar cyclic property. Meanwhile, it is robust to large sampling and carrier frequency offset and strong channel frequency selectivity, as demonstrated by the analysis and simulations.

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“…STE implies that the sampling does not align at the central of the samples, which was also named sampling clock phase offset in some literatures [2,3]. The sampling clock error will cause ICI, and a drift in the symbol timing and further worsen ISI [3,4]. The effects of SFO on the system performance are analyzing in terms of BER degradation and ISI in [4,5], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…SFO means the offset of sampling frequency between transmitter and receiver. STE implies that the sampling does not align at the central of the samples, which was also named sampling clock phase offset in some literatures [2,3]. The sampling clock error will cause ICI, and a drift in the symbol timing and further worsen ISI [3,4].…”

Section: Introductionmentioning

confidence: 99%

A novel sampling synchronization scheme for OFDM-based system with unified reference clock

Sun

Peng

Wang

2012

J Wireless Com Network

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Due to the constraint of cost and size for mobile wireless communication terminals, many orthogonal frequency division multiplexing (OFDM)-based systems required the same crystal driving the sampling and the channel frequencies, which leads to the challenge of a more comprehensive sampling clock synchronization scheme needed. In this article, the effect of sampling clock error on the system performance was analyzed by dividing it into sampling clock frequency offset (SFO) and sampling timing error (STE) firstly. After that, we proposed a two-stage scheme of sampling clock synchronization based on theoretical derivation: the preliminary SFO was jointly acquired with the carrier frequency offset by using the improved preamble-aided algorithm firstly, the timing drift resulted from residual SFO and STE was tracked based on a phase looped lock in the second stage. The deviation properties of the estimation were achieved theoretically, which reveals that both the estimating variances of SFO and timing drift are in inverse proportion to signal-to-noise ratio and grow linearly by the number of total subcarrier. The results of the simulation show that the proposed synchronization scheme can introduce preferable tracking and robust synchronizing performance for this kind of OFDM-based system.

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Timing recovery for OFDM transmission

Cited by 240 publications

References 12 publications

A frequency domain approach for non-coherent timing chip-level synchronization for cdma systems

A frequency domain approach for non-coherent timing chip-level synchronization for cdma systems

Joint Synchronization Using Cyclic Property

A novel sampling synchronization scheme for OFDM-based system with unified reference clock

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