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| 1 | Automatic modulation classification using modulation fingerprint extraction显示文摘An automatic method for classifying frequency shift keying(FSK),minimum shift keying(MSK),phase shift keying(PSK),quadrature amplitude modulation(QAM),and orthogonal frequency division multiplexing(OFDM)is proposed by simultaneously using normality test,spectral analysis,and geometrical characteristics of in-phase-quadrature(I-Q)constellation diagram.Since the extracted features are unique for each modulation,they can be considered as a fingerprint of each modulation.We show that the proposed algorithm outperforms the previously published methods in terms of signal-to-noise ratio(SNR)and success rate.For example,the success rate of the proposed method for 64-QAM modulation at SNR=11 dB is 99%.Another advantage of the proposed method is its wide SNR range;such that the probability of classification for 16-QAM at SNR=3 dB is almost 1.The proposed method also provides a database for geometrical features of I-Q constellation diagram.By comparing and correlating the data of the provided database with the estimated I-Q diagram of the received signal,the processing gain of 4 dB is obtained.Whatever can be mentioned about the preference of the proposed algorithm are low complexity,low SNR,wide range of modulation set,and enhanced recognition at higher-order modulations. | NOROLAHI Jafar AZMI Paeiz AHMADI Farzaneh | 2021 | Journal of Systems Engineering and Electronics2021，32，4： | 1 |
| 2 | A Study of the Extreme Effects of Fading Correlation and the Impact of Imperfect MMSE Channel Esti- mation on the Performance of SIMO Zero - Forc- ing Receivers and on the Capacity - Maximizing Strategy in SIMO Links 显示文摘 | Khashayar Salehi Nobandegani Paeiz Azmi | 2010 | Ieee transactions on vehicular technology2010，59，3： | 1 |
| 3 | A Novel Bandwidth Efficient SOC-Based Turbo Coding Scheme Mid Reduced Complexity MUD for SA-Based MC-CDMA Systems显示文摘 | ALI REZA ENAYATI PAEIZ AZMI YAGHOOB TAGHINIA | 2012 | Telecommunication Systems2012，50，2： | 1 |
| 4 | Narrow-band interference suppression in Time-Division-Duplex CDMA systems using preprocessing techniques显示文摘This letter presents two preprocessing techniques for narrow-band interference (NBI) rejection in Time-Division-Duplex (TDD) CDMA systems. In the proposed methods, at the transmitter, by using Karhaunen-Loeve Transform and Discrete Fourier Transform, the transmitted power is set to zero in the directions of the eigenvectors that will be severely contaminated by NBI; and therefore less part of the transmitted energy will be polluted by NBI in channel. The processing is transferred from receiver to transmitter, and thus the complexity of the receiver is significantly reduced. It is assumed that channel state information can be estimated at the transmitter because in symmetric TDD systems each receiver in turn also acts as a transmitter. | Paeiz Azmi Nooshin Tavakkoli | 2008 | Journal of Systems Engineering and Electronics2008，19，5： | 1 |
| 5 | Low Complexity Adaptive Equalizers for Underwater Acoustic Communications显示文摘Interference signals due to scattering from surface and reflecting from bottom is one of the most important problems of reliable communications in shallow water channels. To solve this problem, one of the best suggested ways is to use adaptive equalizers. Convergence rate and misadjustment error in adaptive algorithms play important roles in adaptive equalizer performance. In this paper, affine projection algorithm(APA), selective regressor APA(SR-APA), family of selective partial update(SPU) algorithms, family of set-membership(SM) algorithms and selective partial update selective regressor APA(SPU-SR-APA) are compared with conventional algorithms such as the least mean square(LMS) in underwater acoustic communications. We apply experimental data from the Strait of Hormuz for demonstrating the efficiency of the proposed methods over shallow water channel. We observe that the values of the steady-state mean square error(MSE) of SR-APA, SPU-APA, SPU-normalized least mean square(SPU-NLMS), SPU-SR-APA, SM-APA and SM-NLMS algorithms decrease in comparison with the LMS algorithm. Also these algorithms have better convergence rates than LMS type algorithm. | Masoumeh SOFLAEI Paeiz AZMI | 2014 | China Ocean Engineering2014，28，4： | 0 |
| 6 | Feasibility of a novel beamforming algorithm via retrieving spatial harmonics显示文摘This paper introduces an algorithm for beamforming systems by the aid of multidimensional harmonic retrieval(MHR).This algorithm resolves problems,removes limitations of sampling and provides a more robust beamformer.A new sample space is created that can be used for estimating weights of a new beamforming called spatial-harmonics retrieval beamformer(SHRB).Simulation results show that SHRB has a better performance,accuracy,and applicability and more powerful eigenvalues than conventional beamformers.A simple mathematical proof is provided.By changing the number of harmonics,as a degree of freedom that is missing in conventional beamformers,SHRB can achieve more optimal outputs without increasing the number of spatial or temporal samples.We will demonstrate that SHRB offers an improvement of 4 dB in signal to noise ratio(SNR) in bit error rate(BER) of 10~(-4) over conventional beamformers.In the case of direction of arrival(DOA) estimation,SHRB can estimate the DOA of the desired signal with an SNR of-25 dB,when conventional methods cannot have acceptable response. | NOROLAHI Jafar AZMI Paeiz NASIRIAN Mahdi | 2022 | Journal of Systems Engineering and Electronics2022，33，1： | 0 |
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