scholarly journals Cyclostationary Impulsive Noise Mitigation in the Presence of Cyclic Frequency Offset for Narrowband Powerline Communication Systems

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 988
Author(s):  
Ying-Ren Chien ◽  
Jian-Liang Lin ◽  
Hen-Wai Tsao
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Impulsive Noise ◽  
Frequency Offset ◽  
Noise Mitigation ◽  
Powerline Communication ◽  
Cyclic Frequency ◽  
Phase Variations ◽  
The Difference ◽  
Offset Compensation

Cyclostationary impulsive noise (CSIN) is the dominant source of additive noise in narrowband powerline communication (NB-PLC) systems. Frequency-shift (FRESH) filters have been applied to NB-PLC systems based on orthogonal frequency division multiplexing (OFDM) to mitigate CSIN and enhance the OFDM signals by leveraging the difference in cyclic frequency associated with CSIN and OFDM data symbols. Note that under the effects of frequency fluctuation in the mains voltage, the cyclic frequency offset associated with CSIN can degrade the performance of FRESH-filter receivers. To alleviate such an impact on the FRESH-filter receivers, this paper presents a method for the estimation of the cyclic frequency offset by observing phase variations in the coefficients of the FRESH filter. Computer simulations based on IEEE 1901.2 specifications demonstrate the effectiveness of the proposed scheme in suppressing the cyclic frequency relative error by at least 15.45 dB. Following compensation for the cyclic frequency offset, the proposed scheme achieved a bit error rate of 10 − 4 with an E b / N 0 loss of only 0.7 dB, compared with the ideal case. Compared to the case without the cyclic frequency offset compensation, the proposed scheme achieved an E b / N 0 gain of 2.7 dB.

A Novel Precoding and Impulsive Noise Mitigation Scheme for MIMO Power Line Communication Systems

2019 ◽  
Vol 13 (1) ◽  
pp. 6-17 ◽  
Author(s):  
Yuwen Qian ◽  
Xiangwei Zhou ◽  
Jun Li ◽  
Feng Shu ◽  
Dushantha Nalin K. Jayakody
Keyword(s):  
Communication Systems ◽  
Impulsive Noise ◽  
Power Line ◽  
Power Line Communication ◽  
Noise Mitigation

scholarly journals Low-Complexity Synchronization Scheme with Low-Resolution ADCs

Information ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 313 ◽  
Author(s):  
Liu Jun ◽  
Luo Zhongqiang ◽  
Xiong Xingzhong
Keyword(s):  
Power Consumption ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Offset ◽  
Ultra Wideband ◽  
Timing Synchronization ◽  
Quantization Scheme ◽  
Frequency Offset Estimation ◽  
Low Resolution ◽  
Synchronization Scheme

An important function of next-generation (5G) and beyond mobile communication systems is aim to provide thousand-fold capacity growth and to support high-speed data transmission up to several megabits per second. However, the research community and industries have to face a dilemma of power consumption and hardware design to satisfy the increasing communication requirements. For the purpose of improving the system cost, power consumption, and implementation complexity, a novel scheme of symbol timing and frequency offset estimation with low-resolution analog-to-digital converters (ADCs) based on an orthogonal frequency division multiplexing ultra-wideband (OFDM-UWB) system is proposed in this paper. In our work, we first verified the principle that the autocorrelation of the pseudo-noise (PN) sequences was not affected by low-resolution quantization. With the help of this property, the timing synchronization could be strongly implemented against the influence of low-resolution quantization. Then, the transmitted signal structure and low-resolution quantization scheme under the synchronization scheme were designed. Finally, a frequency offset estimation model with one-bit timing synchronization was established. Theoretical analysis and simulation results corroborate that the performance of the proposed scheme not only approximates to that of the full-resolution synchronization scheme, but also has lower power consumption and computational complexity.

scholarly journals Mitigating Impulsive Noise for Wavelet-OFDM Powerline Communication

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1567 ◽  
Author(s):  
Ying-Ren Chien ◽  
Hao-Chun Yu
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Impulsive Noise ◽  
Variable Step Size ◽  
Discrete Wavelet ◽  
Monitoring And Control ◽  
Smart Meters ◽  
Step Size ◽  
Powerline Communication ◽  
Gradual Improvement ◽  
The Impact

Advanced metering infrastructure (AMI) is an important application of smart grid communication technology used for the remote monitoring and control of smart meters. Broadband powerline communication (BB-PLC) systems could perhaps be used for AMI; however, impulsive noise (IN) greatly degrades performance. In addition to the fast Fourier transform (FFT)-based orthogonal frequency-division multiplexing (OFDM), IEEE 1901 specifications have defined the other physical layer called wavelet-based OFDM. Even though many existing studies have reported the IN mitigation algorithms for the FFT-based OFDM system, these approaches may not directly apply to the wavelet-OFDM-based PLC systems. In this paper, we propose a robust receiver for PLC systems based on wavelet-OFDM. The proposed receiver comprises a pre-IN mitigation block, an adaptive inverse discrete wavelet transform, and an iterative IN reconstruction block. The iterative cancellation of strong IN samples leads to a gradual improvement in the quality of the received signal. Instead of using the frequency domain approach, we reduce the inter-dependency of the channel estimation and per-subchannel equalization by using the time domain signal processing. Besides, we apply variable step-size adaptive algorithms to reduce the impact of IN during the training processes for the channel estimator and per-subchannel equalizer. In accordance with IEEE 1901 specifications, we built a simulation environment to evaluate the effectiveness of the proposed method. Simulation results demonstrated that conventional blanking devices fall short in terms of IN mitigation, and that the proposed scheme is able to achieve performance values approaching those obtained in cases without IN.

scholarly journals Design of a Test for Detecting the Presence of Impulsive Noise

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7135
Author(s):  
Hyungkook Oh ◽  
Dongho Seo ◽  
Haewoon Nam
Keyword(s):  
Communication Systems ◽  
Heavy Tails ◽  
Impulsive Noise ◽  
Additive White Gaussian Noise ◽  
Test Method ◽  
Weighted Sum ◽  
Cumulative Density Function ◽  
Maximum Difference ◽  
Kolmogorov Smirnov ◽  
The Difference

This paper proposes a new test method of detecting the presence of impulsive noise based on a complementary cumulative density function (CCDF). Impulsive noise severely degrades performance of communication systems and the conventional Kolmogorov–Smirnov (K–S) test may not perform well, because the test does not consider the characteristics of impulsive noise. In order to detect the presence of impulsive noise reliably, the CCDF of measurement samples is analyzed and compared with the CCDF of additive white Gaussian noise to find the difference between those CCDFs. Due to the nature of heavy-tails in impulsive noise, only the maximum difference may not be sufficient for the accurate detection of impulsive noise. Therefore, the proposed method applies the test hypothesis using the weighted sum of all the differences between those CCDFs. Simulation results justify that the proposed test is more robust and provides lower miss detection probability than the K–S test in the presence of impulsive noise.

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