scholarly journals Effective Blind Frequency Offset Estimation Scheme for BST-OFDM Based HDTV Broadcast Systems

Symmetry ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 379 ◽  
Author(s):  
Yong-An Jung ◽  
Young-Hwan You
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Frequency Offset ◽  
Joint Estimation ◽  
Pilot Symbols ◽  
Quality Video ◽  
Estimation Scheme ◽  
Digital Broadcasting ◽  
High Quality Video ◽  
T System

The integrated services digital broadcasting-terrestrial (ISDB-T) system is designed in order to accommodate high-quality video/audio and multimedia services, using band segmented transmission orthogonal frequency division multiplexing (BST-OFDM) scheme. In the ISDB-T system, the pilot configuration varies depending on whether a segment uses a coherent or differential modulation. Therefore, it is necessary to perform a joint estimation of carrier frequency offset (CFO) and sampling frequency offset (SFO) independent of the segment format in the ISDB-T system. The goal is to complete those synchronization tasks while considering an information-carrying transmission and multiplexing configuration control (TMCC) signal as pilot symbols. It is demonstrated through numerical simulations that the differential BPSK-modulated TMCC information can be efficiently used for a least-squares estimation of CFO and SFO, offering an acceptable performance.

scholarly journals Data-Aided Frequency Offset Estimation for CE-OFDM Broadband Satellite Systems

2019 ◽  
Vol 9 (11) ◽  
pp. 2310 ◽  
Author(s):  
Wang Cheng ◽  
Cao Yushi ◽  
Wang Weidong
Keyword(s):  
Network Architecture ◽  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Average Power ◽  
Frequency Offset ◽  
Satellite Systems ◽  
Constant Envelope ◽  
Pilot Symbols ◽  
Estimation Scheme ◽  
Cramer Rao Bound

In recent years, the constant-envelope orthogonal frequency-division multiplexing (CE-OFDM) has been considered as a candidate waveform in broadband satellite systems as it has a 0-dB peak-to-average power ratio (PAPR). However, the carrier frequency offset (CFO) estimation scheme for CE-OFDM broadband satellite systems directly affects system performance. In this paper, we analyze the network architecture and the propagation environment of CE-OFDM broadband satellite systems, and we propose a data-aided CFO estimation strategy based on the frequency domain pilot symbols. The Cramer–Rao bound (CRB) of our CFO estimator is given by mathematical analysis, and the effect of the number of pilot symbols on the estimation performance is analyzed. The pilot symbol-based CFO estimator is composed of a phase demodulator and a discrete Fourier transform (DFT) module, and it can obtain a large estimation range under a small pilot overhead. The simulation results show that the CE-OFDM broadband satellite systems can achieve a good bit error rate (BER) performance by using the proposed strategy to estimate and compensate the CFO.

scholarly journals Complexity Effective Sampling Frequency Offset Estimation Method for OFDM-Based HomePlug Green PHY Systems

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 544
Author(s):  
Yong-An Jung ◽  
Young-Hwan You
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Estimation Method ◽  
Frequency Offset ◽  
Sampling Frequency ◽  
Estimation Accuracy ◽  
Computationally Efficient ◽  
Pilot Symbols ◽  
Sampling Frequency Offset ◽  
Efficient Sampling ◽  
Estimation Scheme

The HomePlug Green PHY (HomePlug GP) specification provides an attractive solution to enable smart grid power line communication (PLC) applications by using robust orthogonal frequency division multiplexing (ROBO) mode. This paper proposes a computationally efficient sampling frequency offset (SFO) estimation technique in the HomePlug GP system without relying on pilot symbols. For this purpose, the proposed estimation scheme utilizes the redundant information contained within the repeat coding in the HomePlug GP ROBO mode, thus eliminating the need of dedicated pilots. Computer simulations are conducted to assess the performance of the proposed SFO estimation scheme and to compare it with the conventional decision-directed (DD) estimation schemes. Simulations indicate that the repeat coded ROBO signals are effectively used for the proposed estimation scheme, which provides an affordable estimation accuracy while reducing the complexity compared to the conventional DD estimation schemes.

EVALUATION OF RAPID PROTOTYPING SOLUTIONS FOR A 802.16D FREQUENCY OFFSET ESTIMATION SCHEME

2012 ◽  
Vol 21 (07) ◽  
pp. 1250056
Author(s):  
JAVIER GONZÁLEZ-BAYÓN ◽  
ANGEL FERNÁNDEZ-HERRERO ◽  
CARLOS CARRERAS
Keyword(s):  
Rapid Prototyping ◽  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Frequency Offset ◽  
Gate Arrays ◽  
Field Programmable ◽  
Estimation Scheme ◽  
Programmable Gate Arrays ◽  
Implementation Methodology ◽  
Synchronization Scheme

Synchronization of the carrier frequency offset (CFO) is a critical task in orthogonal frequency division multiplexing systems. Imperfect estimation of the CFO causes inter-carrier interference (ICI) that severely degrades the performance of the communications system. Although this is a well studied subject at the algorithmic level, more research is needed when considering implementations in real hardware. Translation of an algorithmic specification to a hardware language is a time consuming task for the designer. This task is more difficult when the target technology offers limited resources, as in the case of field programmable gate arrays (FPGAs). Some rapid prototyping tools, as System Generator from Xilinx or Synplify DSP from Synopsys Synplicity, are available for the designer to facilitate this task. However, their performance has not been evaluated in the literature. Therefore, the goal of this paper is to present an illustrating example of an implementation methodology using these tools and to evaluate their performance when considering a real design. In particular, several FPGA implementations of a frequency synchronization scheme for the 802.16d (fixed WiMAX) standard using these rapid prototyping tools are studied and evaluated. The results from the different solutions are analyzed and compared to draw conclusions about their advantages and drawbacks.

Estimation of OFDM Carrier Frequency Offset Robust to Offset Variation

2013 ◽  
Vol 284-287 ◽  
pp. 2642-2646
Author(s):  
Chang Ha Yu ◽  
Young Po Lee ◽  
Sun Yong Kim ◽  
Gyu In Jee ◽  
Seok Ho Yoon
Keyword(s):  
Carrier Frequency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Frequency Offset ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Estimation Scheme ◽  
Conventional Scheme ◽  
Estimation Range

In this paper, we propose a novel carrier frequency offset (CFO) estimation scheme for orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme has much wider estimation range compared with that of the conventional scheme, making it more robust to the fractional FO variation. Numerical results demonstrate that the proposed scheme has better estimation performance than the conventional scheme for wider fractional FO range.

scholarly journals State-Space Estimation for OFDM and SC-FDE Schemes with Strongly Varying Carrier Frequency Offset

1970 ◽  
Vol 4 (1) ◽  
pp. 21-29
Author(s):  
Pedro Pedrosa ◽  
Rui Dinis ◽  
Fernando Nunes
Keyword(s):  
Fading Channels ◽  
Carrier Frequency ◽  
Channel Coding ◽  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Multipath Fading ◽  
Frequency Offset ◽  
Spatial Diversity ◽  
Single Carrier ◽  
Pilot Symbols

Parametric algorithms for the estimation of rapidly-varying Carrier Frequency Offset (CFO) usually employ pilot symbols multiplexed with the data transmission. As the CFO variation rate increases so has to increase the density of pilot symbols transmitted, thus impairing the bandwidth efficiency. In order to reduce the number of pilot symbols used in the estimation of rapidly-varying CFO it was proposed to use a truncated Taylors series to predict the CFO, where the derivatives up to order d-1 are recursively estimated with a d-order Kalman filter (KF).We propose to compare the performance of a fourth-order KF predictor in the most popular block transmission systems: Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier Frequency-Domain Equalization (SC-FDE). Simulating different transmission scenarios, e.g., channel coding and spatial diversity, our results show that for static multipath fading channels the proposed receiver for the SC-FDE scheme exhibits better Bit Error Rate (BER) performance than that of OFDM.

scholarly journals Robust Blind Detection of Integer Carrier Frequency Offset for Terrestrial Broadcasting Systems Using Band Segmented Transmission

Symmetry ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 896
Author(s):  
Yong-An Jung ◽  
Young-Hwan You
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
A Priori ◽  
Video On Demand ◽  
Frequency Offset ◽  
Blind Detection ◽  
Blind Estimation ◽  
High Definition ◽  
Advanced Video Coding ◽  
T System

In the integrated services digital broadcasting-terrestrial (ISDB-T) system, the combination of digital terrestrial transmission and MPEG-4 advanced video coding (MPEG-4 AVC) has offered ways to provide a variety of digital high-definition television (HDTV) programs. Using band segmented transmission orthogonal frequency division multiplexing (BST-OFDM), the delivery of innovative video-on-demand and HDTV services is supported. To take full advantage of the attractive benefits of BST-OFDM, it is important to estimate integer frequency offset (IFO) without a priori knowledge on the segment type that is transmitted over transmission and the multiplexing configuration control (TMCC) signal. To address this issue, an efficient IFO detection method is proposed for the ISDB-T system employing BST-OFDM. To enable IFO detection independent of the segment type, information-bearing TMCC signals that are asymmetrically distributed in the frequency domain are used as pilot symbols. Numerical analysis is performed to present the relationship between error probability and design parameter. We show via the numerical results that the multiple transmitted TMCC information is efficiently used for blind estimation of the IFO, achieving robust estimation in the presence of the fractional frequency offset.

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