Sparse Signal Reconstruction using Weight Point Algorithm

In this paper we propose a new approach of the compressive sensing (CS) reconstruction problem based on a geometrical interpretation of l1-norm minimization. By taking a large l1-norm value at the initial step, the intersection of l1-norm and the constraint curves forms a convex polytope and by exploiting the fact that any convex combination of the polytope's vertexes gives a new point that has a smaller l1-norm, we are able to derive a new algorithm to solve the CS reconstruction problem. Compared to the greedy algorithm, this algorithm has better performance, especially in highly coherent environments. Compared to the convex optimization, the proposed algorithm has simpler computation requirements. We tested the capability of this algorithm in reconstructing a randomly down-sampled version of the Dow Jones Industrial Average (DJIA) index. The proposed algorithm achieved a good result but only works on real-valued signals

A Novel Multiple-Output DUSTF Coding on High Mobility MIMO-Wireless Communication Systems

In the future, wireless access system will operate in high data rate transmission and high mobility environment, to support private and public access. For such an environment, it is necessary to develop a system that has a higher spectrum efficiency and is able to mitigate selective fading problems. A novel multiple-output differential unitary space-time frequency (DUSTF) coding scheme is proposed to overcome those problems. The implementation of this inner coding scheme is unified with MIMO system, so that the scheme has a good spectrum efficiency. The differential space-time modulation in this proposed scheme is intended to operate in a non-coherent channel transmission scheme and to guarantee the system performance. In order to combat the selective fading problems, the multi-carrier space frequency scheme is utilized in the proposed scheme. In general, simulation result shows that the MIMO wireless system with the multiple-output DUSTF coding scheme in a non-coherent channel transmission scheme provides a good system performance. The proposed scheme can outperforms other previously published inner coding scheme for high mobility and high SNR. The system also achieves a good channel capacity

Karakterisasi Domain Waktu Antena Bowtie Ujung Sirkuler 1- 2 Ghz Dengan Respon Impuls Ternormalisasi

Time Domain Characterization of 1-2 GHz Circular-ended Bowtie Antenna Using Normalizad ImpulseResponse. Frequency domain analysis is a powerful and compact tool for characterizing the antenna parameters such asgain, radiation pattern and the impedance as a function of frequency. However, if time or space is a major concern,such as in the GPR appication, the time domain analysis would be a very important tool due to their unique capabilityfor determining the echo delay and range profile of target image. In this paper, we will describe the classical theory ofsystem characterization in time domain, and then also propose the mathematical model for characterizing the 1 - 2 GHzcircular-ended Bowtie antenna. From the measurement results, we concluded that the implemented Bowtie antenna hasgood normalized impulse response with very small ringing, so it is suitable for GPR applications

Desain Dan Realisasi Stepped Frequency Gpr 1-2 Ghz Untuk Aplikasi Deteksi Logam Dalam Tanah

Design and Implementation of 1-2 GHz Stepped Frequency GPR for Buried Metal Detection. In this paper, wedescribe the design and realization steps of 1 - 2 GHz SFGPR (Stepped Frequency Ground Penetrating Radar)transceiver for metal detection under the ground. Before using prototyped GPR for detecting the metal under theground, several of calibration processes must be performed, namely phase calibration and monocycle pulse waveformcalibration. After completing the calibrations, this prototyped GPR would be ready for detecting a hidden object such asa metal plate 5 cm under the ground in our small test range size 25 cm x 75 cm x 10 cm. From the calibration anddetection results, we concluded that the prototyped SFGPR passed the technical specifications of the design and couldperform the metal detection under the ground with high SNR

KARAKTERISASI DOMAIN WAKTU ANTENA BOWTIE UJUNG SIRKULER 1- 2 GHZ DENGAN RESPON IMPULS TERNORMALISASI

Time Domain Characterization of 1-2 GHz Circular-ended Bowtie Antenna Using Normalizad ImpulseResponse. Frequency domain analysis is a powerful and compact tool for characterizing the antenna parameters such asgain, radiation pattern and the impedance as a function of frequency. However, if time or space is a major concern,such as in the GPR appication, the time domain analysis would be a very important tool due to their unique capabilityfor determining the echo delay and range profile of target image. In this paper, we will describe the classical theory ofsystem characterization in time domain, and then also propose the mathematical model for characterizing the 1 - 2 GHzcircular-ended Bowtie antenna. From the measurement results, we concluded that the implemented Bowtie antenna hasgood normalized impulse response with very small ringing, so it is suitable for GPR applications.Keywords: time domain analysis, circuar ended bowtie, normalized impulse respons

DESAIN DAN REALISASI STEPPED FREQUENCY GPR 1-2 GHZ UNTUK APLIKASI DETEKSI LOGAM DALAM TANAH

Design and Implementation of 1-2 GHz Stepped Frequency GPR for Buried Metal Detection. In this paper, wedescribe the design and realization steps of 1 - 2 GHz SFGPR (Stepped Frequency Ground Penetrating Radar)transceiver for metal detection under the ground. Before using prototyped GPR for detecting the metal under theground, several of calibration processes must be performed, namely phase calibration and monocycle pulse waveformcalibration. After completing the calibrations, this prototyped GPR would be ready for detecting a hidden object such asa metal plate 5 cm under the ground in our small test range size 25 cm x 75 cm x 10 cm. From the calibration anddetection results, we concluded that the prototyped SFGPR passed the technical specifications of the design and couldperform the metal detection under the ground with high SNR.Keywords: stepped frequency, GPR, metal detector, phase and monocylce calibration