Class of cyclic-based estimators for frequency-offset estimation of OFDM systems

Lashkarian, N.; Kiaei, S.

doi:10.1109/26.891224

Cited by 128 publications

(60 citation statements)

References 15 publications

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“…One of the methods introduced was cyclic prefix method to compute frequency offset and symbol timing errors but it was difficult to find the start of the frame. So all the OFDM symbols begin with preamble symbols and are used in calculating the frequency offset [3]- [4]. However there is some uncertainty in determining the start of the frame.…”

Section: Synchronization Of Ofdmmentioning

confidence: 99%

OFDM Synchronization Techniques Analysis for IEEE 802. 16d Review

Rana¹,

Setia²

2015

IJCA

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Orthogonal frequency division multiplexing (OFDM) is a reliable technology for high-speed data transmission by virtue of its spectral efficiency and robustness to multi-path fading. These advantages can be achieved only with good synchronization both in time and frequency. This paper introduces efficient synchronization methods for an OFDM based system, IEEE 802.16d. A symbol timing synchronization scheme is critical in the design of an OFDM receiver. Large timing errors can result in loss of orthogonality between subcarrier, ISI and severe bit degradation. To minimize this degradation two kinds of synchronization algorithms are provided: Auto-correlation and cross correlation. This brief discusses these techniques used in synchronization of OFDM and which one is preferred.

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Section: Synchronization Of Ofdmmentioning

confidence: 99%

OFDM Synchronization Techniques Analysis for IEEE 802. 16d Review

Rana¹,

Setia²

2015

IJCA

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“…Many techniques have been proposed for effective OFDM synchronization in the literature that include both data-aided schemes [6][7][8], and blind schemes [9], [10]. The latter schemes use inherent structure of the OFDM symbol (i.e.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Data-aided Synchronization in L-DACS1 for Aeronautical Communications

Pham

Vinod

Madhukumar

2017

Proceedings of the 2017 International Conference on Data Mining, Communications and Information Technology

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L-band Digital Aeronautical Communication System type-1 (L-DACS1) is an emerging standard that aims at enhancing air traffic management (ATM) by transitioning the traditional analog aeronautical communication systems to the superior and highly efficient digital domain. L-DACS1 employs modern and efficient orthogonal frequency division multiplexing (OFDM) modulation technique to achieve more efficient and higher data rate in comparison to the existing aeronautical communication systems. However, the performance of OFDM systems is very sensitive to synchronization errors. L-DACS1 transmission is in the L-band aeronautical channels that suffer from large interference and large Doppler shifts, which makes the synchronization for L-DACS more challenging. This paper proposes a novel computationally efficient synchronization method for L-DACS1 systems that offers robust performance. Through simulation, the proposed method is shown to provide accurate symbol timing offset (STO) estimation as well as fractional carrier frequency offset (CFO) estimation in a range of aeronautical channels. In particular, it can yield excellent synchronization performance in the face of a large carrier frequency offset.

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“…Cyclic Prefix (CP) based method is used to determine frequency offset and symbol timing [4]. The drawback of this method is that it does not find the start of the frame.…”

Section: Introductionmentioning

confidence: 99%

Design of Low Power and High Speed Correlators for IEEE 802.16 WiMAX Systems

B¹,

Poongodi²

2016

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The advanced communication system uses wireless broadband access technologies which provide high speed data connectivity to the subscribers. One of the most popular wireless access technology is Worldwide Interoperability for Microwave Access (WiMAX) and it is based on IEEE 802.16 standard. WiMAX used Orthogonal Frequency Division Multiplexing (OFDM) is an effective modulation technique to improve the timing synchronization. The performance of channel is affected due to the synchronization mismatching between the transmitter and receiver ends. To achieve the timing synchronization in IEEE 802.16 systems, the cross correlator is used to synchronize the received signal with the known signal. In this paper, two high speed correlators are proposed based on Q1.15 format, which is used to validate the timing synchronization problem. The proposed work has been mapped on XC6VCX75T FPGA and simulations are carried out on the Xilinx-ISIM platform. The implementation result shows that the power delay product reduction is 40.81%, and delay reduction is 39.59% over the conventional multiplier less correlators.

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Class of cyclic-based estimators for frequency-offset estimation of OFDM systems

Cited by 128 publications

References 15 publications

OFDM Synchronization Techniques Analysis for IEEE 802. 16d Review

OFDM Synchronization Techniques Analysis for IEEE 802. 16d Review

An Efficient Data-aided Synchronization in L-DACS1 for Aeronautical Communications

Design of Low Power and High Speed Correlators for IEEE 802.16 WiMAX Systems

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