Blind Weighted Least-Squares Frequency Offset Estimation Method for LTE Machine-Type Communications

Jung, Yongju; Kim, Moo-Young; Song, Hyoung‐Kyu; You, Young-Hwan

doi:10.1109/jiot.2019.2932089

Cited by 4 publications

(7 citation statements)

References 31 publications

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“…2 depict MSE(δ) versus E b /N 0 for CH1 and for CH2, respectively, for the proposed SFO estimator of Eqn. (13), the LSE and the LHHYW, as well a the corresponding CRB. We observe in Fig.…”

Section: B Simulation Resultsmentioning

confidence: 99%

“…Nsym Nsc δ k∈S k induces bias in the LSE CFO and SFO estimates, whose value depends, among others, on δ. To avoid this bias, we propose to first estimate the SFO using (13) and then use the estimated SFOδ to remove the impact of the SFO on the quantity Y m,k , defined in [9,Eqn. (2)].…”

Section: A Modification To the Cfo Estimator Of The Lse Methodsmentioning

confidence: 99%

“…In this work we refer to this method as the 'Modified LSE', and we emphasize that the SFO is estimated in Eqn. (13).…”

Section: A Modification To the Cfo Estimator Of The Lse Methodsmentioning

confidence: 99%

“…It is noted that there are works which assume that both the sampling clock and the carrier oscillator are generated from a single clock, which induces a deterministic relationship between the SFO and the CFO, see e.g., [12]. Typically, such an assumption is used for motivating further model simplifications, such as neglecting the impact of the the SFO on the phase of the frequency domain representation, see e.g., [12], [13], and [14].…”

Section: K=0mentioning

confidence: 99%

“…Note that |H| 2 = 1. 4 In [4] the CFO used in the simulations is n ≈ 0.02 and δ corresponds to 100 [ppm]; in [5] CFO considered in CFO synchronization works is taken to be smaller than half the subcarrier spacing, [19,Section II], [12], [13]. For the simulation scenario parameters used in this section, this corresponds to a maximal CFO of max n = 0.5.…”

Section: Numerical Performance Evaluation a Simulation Parametersmentioning

confidence: 99%

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A Novel Low-Complexity Estimation of Sampling and Carrier Frequency Offsets in OFDM Communications

Rotem

Dabora

2020

IEEE Access

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This paper presents a novel low-complexity sequential, blind, pilot-assisted estimator for the sampling frequency offset (SFO) and the carrier frequency offset (CFO), for orthogonal frequencydivision multiplexing (OFDM) communications. The proposed algorithm processes the received subcarriers to obtain a cost function which depends only on a single unknown parameter at a time, either the SFO or the CFO, as well as on a specifically designed auxiliary parameter, while ignoring the noise. Then, by computing the cost function at a few selected values of the auxiliary parameter, an explicit estimator for each unknown parameter is derived, thereby avoiding the need for a search. To the best of our knowledge, this is the first time such a deterministic approach is applied to the joint estimation of the SFO and the CFO. Moreover, the proposed estimator does not require knowledge of the channel coefficients at the pilot subcarriers, and achieves good performance with a relatively small number of pilot symbols, which results in a low computational complexity. Simulation results show that at low computational complexity, there are many scenarios in which the new estimator achieves smaller estimation errors compared to other existing methods. INDEX TERMS OFDM, synchronization, carrier frequency offset, sampling frequency offset.

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“…2 depict MSE(δ) versus E b /N 0 for CH1 and for CH2, respectively, for the proposed SFO estimator of Eqn. (13), the LSE and the LHHYW, as well a the corresponding CRB. We observe in Fig.…”

Section: B Simulation Resultsmentioning

confidence: 99%

Section: A Modification To the Cfo Estimator Of The Lse Methodsmentioning

confidence: 99%

“…In this work we refer to this method as the 'Modified LSE', and we emphasize that the SFO is estimated in Eqn. (13).…”

Section: A Modification To the Cfo Estimator Of The Lse Methodsmentioning

confidence: 99%

Section: K=0mentioning

confidence: 99%