29 research outputs found
Pengolahan sinyal digital dengan pemrograman Matlab
No full textBib. hal. 263-264x, 266 hlm. : il. ; 26 cm
Joint Smoothed l0-Norm DOA Estimation Algorithm for Multiple Measurement Vectors in MIMO Radar
No full textDirection-of-arrival (DOA) estimation is usually confronted with a multiple measurement vector (MMV) case. In this paper, a novel fast sparse DOA estimation algorithm, named the joint smoothed l 0 -norm algorithm, is proposed for multiple measurement vectors in multiple-input multiple-output (MIMO) radar. To eliminate the white or colored Gaussian noises, the new method first obtains a low-complexity high-order cumulants based data matrix. Then, the proposed algorithm designs a joint smoothed function tailored for the MMV case, based on which joint smoothed l 0 -norm sparse representation framework is constructed. Finally, for the MMV-based joint smoothed function, the corresponding gradient-based sparse signal reconstruction is designed, thus the DOA estimation can be achieved. The proposed method is a fast sparse representation algorithm, which can solve the MMV problem and perform well for both white and colored Gaussian noises. The proposed joint algorithm is about two orders of magnitude faster than the l 1 -norm minimization based methods, such as l 1 -SVD (singular value decomposition), RV (real-valued) l 1 -SVD and RV l 1 -SRACV (sparse representation array covariance vectors), and achieves better DOA estimation performance
Differentially fed compact dual-band implantable antenna for biotelemetry
No full text© 2016 IEEE. A novel differentially fed dual-band planar antenna operating at the medical implant communication service (MICS) band (402-405 MHz) and the industrial, scientific and medical (ISM) bands (2400-2480 MHz) is presented. The measured 10-dB differential reflection coefficient bandwidth is 389-419 MHz (7.4%) at the lower band and 2395-2563 MHz (6.6%) at the upper band, respectively. The volume of the implantable antenna is only 642.62 mm3 (22mm×23mm×1.27mm)
How to deal with impulsive noise in OFDM-based PLC: A survey
No full text© 2017 IEEE. Power-line communications (PLC) is a favorable technology for smart grid systems due to the wide penetration of power-line infrastructure. Broadband PLC (BB-PLC) is required for future smart grid applications as the data traffic may be high. However, BB-PLC performance is degraded by the occurrence of impulsive noise. Some methods have been proposed to reduce the effect of the impulsive noise in BB-PLC. In the liteature, the classification of impulsive noise mitigation methods has not been available. In this paper, we aim to develop a classification of the impulsive mitigation methods and provide a brief discussion of each method. The classification is useful as a further reference of designing BB-PLC systems under impulsive noise environment
A Study on Peak-to-Average Power Ratio in DWT-OFDM Systems
No full textOrthogonal frequency division multiplexing (OFDM) systems suffer from large peak-to-average power ratio (PAPR). In this paper we study the discrete wavelet transform (DWT)-based OFDM systems. In particular, we discuss the effect of the decomposition level of each wavelet family in the DWT-based OFDM regarding the PAPR. The simulation results show that, in general, there is a decomposition level that minimize the PAPR in every wavelet family. In addition, we also analyze the effect of clipping nonlinearities, i.e. conventional clipping and deep clipping, as PAPR reduction method in DWT-OFDM systems. The results show that the clipping nonlinearities give a noticeable PAPR reduction. However, as DWT-OFDM itself has lower PAPR compared to the conventional discrete Fourier transform (DFT)-based OFDM, the clipping nonlinearity subsystem may not be essential as it degrades the system performance. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.537
