Blind Estimation of OFDM Carrier Frequency Offset via Oversampling

Chen, Biao; Wang, Hao

doi:10.1109/tsp.2004.828899

Cited by 89 publications

(35 citation statements)

References 20 publications

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“…Many academic institutions pay much attention to D2D related technology research. And the synchronization problem [2] without cellular network coverage is one of the key issue in the D2D communication research nowadays [3,4].…”

Section: Introductionmentioning

confidence: 99%

Combination Synchronization Protocol with Center Nodes in Device-to-Device Communication System

Fan¹,

Wang²,

Lu³

2016

Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials

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Abstract:In this paper, we propose a hybrid synchronous algorithm based on the combination of distributed and centralized algorithm. First of all, we put forward the concept of local cluster and generalized local cluster. The cluster is a collection of synchronous UE meeting certain conditions and has a center UE. Through this mechanism, we can finish many synchronous parts in advance what we call pre-synchronization which can reduce system latency. When we need system synchronization, we will use the flooding time synchronous protocol. The algorithm has low latency as well as high accuracy and good robustness.

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Section: Introductionmentioning

confidence: 99%

Combination Synchronization Protocol with Center Nodes in Device-to-Device Communication System

Fan¹,

Wang²,

Lu³

2016

Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials

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“…A number of blind algorithms with other approaches have been presented, however, they are rather computationally demanding. In [4] a blind algorithm based on oversampling is presented and in [5] a blind ESPRIT-like algorithm is presented.…”

Section: Introductionmentioning

confidence: 99%

Mitigating Carrier Frequency Offset Using Null Subcarriers

Nisharani¹,

Rajadurai²

2014

Int. Jour. Intel. Elec. Sys.

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-Multicarrier code division multiple access (MC-CDMA) systems are more sensitive to the carrier frequency offset than single carrier systems. Carrier frequency offset destroys the orthogonality among subcarriers in MC-CDMA systems and degrades the system performance seriously. To mitigate the effect of carrier frequency offset, it should be estimated and compensated before demodulation. An efficient algorithm has been proposed to estimate Carrier Frequency Offset in MC-CDMA systems to enhance the performance of the system. The scheme is based on locating spectral minima's within null subcarriers embedded in the spectrum. This is done by scaling the frequency axis to acquire a smaller part of the spectrum at a higher resolution. The significant feature of this algorithm is, it can be repeated to achieve accuracy. This method is suitable for systems with continuous transmission.

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“…Practical CFO estimations are the use of pilot symbols [2] or guard intervals [3]. For spectral efficiency, however, there have been proposed many blind CFO estimations using null subcarrier [4] and over-sampling procedure [5].…”

Section: Introductionmentioning

confidence: 99%

Semi-Blind Channel Estimation for QAM-OFDM Systems

Sogo

Tanaka

Matsuzaki

et al. 2014

Stochastic Systems Theory and its Applications (SSS)

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In most blind channel estimations, the channel gains are correctly estimated but the channel phases are not necessarily estimated correctly: the channel estimates are often accompanied with phase ambiguity. To resolve this phase ambiguity problem, we propose a semiblind channel estimation for QAM (Quadrature Amplitude Modulation) -OFDM (Orthogonal Frequency Division Multiplex) systems using the statistical properties of transmitted symbols in addition to the measurement of received symbols in each subcarrier under LoS (Line of Sight) transmission environments; i) the absolute value of the channel phase is less than π/2 at all subcarrier and is less than π/4 for at least one subcarrier. The proposed method can estimate the channel phase up to ±π/2 without phase wrapping. From several simulations for 50 subcarriers with 16 QAM using 256 OFDM blocks, it has been confirmed that the proposed estimation can estimate the channel at high precision using 256 OFDM blocks at SNR = 20 [dB].

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Blind Estimation of OFDM Carrier Frequency Offset via Oversampling

Cited by 89 publications

References 20 publications

Combination Synchronization Protocol with Center Nodes in Device-to-Device Communication System

Combination Synchronization Protocol with Center Nodes in Device-to-Device Communication System

Mitigating Carrier Frequency Offset Using Null Subcarriers

Semi-Blind Channel Estimation for QAM-OFDM Systems

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