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MAXIMUM LIKELIHOOD SOURCE SEPARATION FOR FINITE IMPULSE RESPONSE MULTIPLE INPUT-MULTIPLE OUTPUT CHANNELS IN THE PRESENCE OF ADDITIVE NOISE
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作者 Kazi Takpaya Wei Gang (Dept. of Communication and Information, South China Univ. of Tech., Guangzhou 510640) 《Journal of Electronics(China)》 2003年第2期81-85,共5页
Blind identification-blind equalization for Finite Impulse Response (FIR) Multiple Input-Multiple Output (MIMO) channels can be reformulated as the problem of blind sources separation. It has been shown that blind ide... Blind identification-blind equalization for Finite Impulse Response (FIR) Multiple Input-Multiple Output (MIMO) channels can be reformulated as the problem of blind sources separation. It has been shown that blind identification via decorrelating sub-channels method could recover the input sources. The Blind Identification via Decorrelating Sub-channels(BIDS)algorithm first constructs a set of decorrelators, which decorrelate the output signals of subchannels, and then estimates the channel matrix using the transfer functions of the decorrelators and finally recovers the input signal using the estimated channel matrix. In this paper, a new approximation of the input source for FIR-MIMO channels based on the maximum likelihood source separation method is proposed. The proposed method outperforms BIDS in the presence of additive white Gaussian noise. 展开更多
关键词 Blind sources separation Channel decorrelating Channel matrix Maximum likelihood sources separation additive white gaussian noise
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Recovery of Transient Signals in Noise by OptimalThresholding in Wavelet Domain
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作者 梅文博 《Journal of Beijing Institute of Technology》 EI CAS 1997年第3期274-279,共6页
:研究用离散子波变换复原被加性高斯白噪声污染的瞬态信号.在子波域中提出了一种最佳门限方法,该方法涉及到对于波系数的假设检验,利用似然比、奈曼,皮尔逊准则和最小均方差设计该门限,计算机仿真证明,该方法在较低信噪比下复原... :研究用离散子波变换复原被加性高斯白噪声污染的瞬态信号.在子波域中提出了一种最佳门限方法,该方法涉及到对于波系数的假设检验,利用似然比、奈曼,皮尔逊准则和最小均方差设计该门限,计算机仿真证明,该方法在较低信噪比下复原信号的有效性. 展开更多
关键词 n (Department of Electrical and Electronic Enginhaerhg University of Central Lancashire Preston PR1 2HE England) Abstract: The recovery of transient signals corrupted by additive white gaussian noise by means of the discrete wavelet transform was studi
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Construction of Regular Rate-Compatible LDPC Convolutional Codes 被引量:1
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作者 Liwei Mu Chulong Liang +1 位作者 Zhiyong Liu Daru Pan 《China Communications》 SCIE CSCD 2016年第8期97-102,共6页
In this paper, we propose a new method to derive a family of regular rate-compatible low-density parity-check(RC-LDPC) convolutional codes from RC-LDPC block codes. In the RC-LDPC convolutional family, each extended... In this paper, we propose a new method to derive a family of regular rate-compatible low-density parity-check(RC-LDPC) convolutional codes from RC-LDPC block codes. In the RC-LDPC convolutional family, each extended sub-matrix of each extended code is obtained by choosing specified elements from two fixed matrices HE1K and HE1K, which are derived by modifying the extended matrices HE1 and HE2 of a systematic RC-LDPC block code. The proposed method which is based on graph extension simplifies the design, and prevent the defects caused by the puncturing method. It can be used to generate both regular and irregular RC-LDPC convolutional codes. All resulted codes in the family are systematic which simplify the encoder structure and have maximum encoding memories which ensure the property. Simulation results show the family collectively offer a steady improvement in performance with code compatibility over binary-input additive white Gaussian noise channel(BI-AWGNC). 展开更多
关键词 binary-input additive white gaussian noise channel(BI-AWGNC) extended matrices rate-compatible low-density parity-check(RC-LDPC) convolutional codes
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SYMMETRIC INFORMATION RATE OF CPM AND OPTIMAL DETECTOR DESIGN
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作者 Yang Zhimin Li Shiju Zhang Zhaoyang 《Journal of Electronics(China)》 2008年第3期294-299,共6页
This paper first calculates numerically the Symmetric Information Rate (SIR) of Cotinuous Phase Modulation (CPM) schemes over Additive White Gaussian Noise (AWGN) channel, modeling CPM and channel as a Memory-less Mod... This paper first calculates numerically the Symmetric Information Rate (SIR) of Cotinuous Phase Modulation (CPM) schemes over Additive White Gaussian Noise (AWGN) channel, modeling CPM and channel as a Memory-less Modulator (MM) plus a Markov Finite State Channel (FSMC), then proposes an optimal detector, which is of BCJR based Decision Feedback Detector (DFD) but non-iterative. It can achieve the SIR as the sequence length approaches infinity while the complexity is extremely low. Finally, both theoretic proof and numerical simulation are performed to show the op- timality. Simulation results show that it nearly achieves the theoretic bound and outperforms the Viterbi Detector (VD) with 2dB in low Eb/N0. 展开更多
关键词 Continuous Phase Modulation (CPM) Symmetric Information Rate (SIR) Decision Feedback Detector (DFD) additive white gaussian noise (AWGN)
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Multiple Input Multiple Output CDSK Chaotic Communication System and Its Performance Analysis 被引量:2
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作者 DUAN Junyi JIANG Guoping YANG Hua 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2016年第3期221-228,共8页
This paper propose a novel noncoherent chaotic com- munication scheme named multiple-input multiple-output correlation-delay-shill- keying (MIMO-CDSK). In this scheme, multiple antennas are employed to strengthen th... This paper propose a novel noncoherent chaotic com- munication scheme named multiple-input multiple-output correlation-delay-shill- keying (MIMO-CDSK). In this scheme, multiple antennas are employed to strengthen the robustness in transmission, and to get more diversity gain. The bit error rate (BER) of the MIMO-CDSK is studied analytically in AWGN channel model and multipath fading channel model. The theory and simulation results show that, the performance gain can be obtained with multiple antennas allocated in the transmitter and receiver. Moreover, it is observed that MIMO-CDSK system can effectively reduce the multipath interference. 展开更多
关键词 multiple input multiple output correlation delayshift keying (CDSK) AWGN additive white gaussian noise)channel model multipath fading channel model diversity gain
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A Novel Minimum Output Variance Estimator for Carrier Frequency Offset in OFDM Systems
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作者 李培胜 张贤达 +1 位作者 苏泳涛 武露 《Tsinghua Science and Technology》 SCIE EI CAS 2007年第6期674-677,共4页
In orthogonal frequency-division multiplexing (OFDM) systems, the carrier frequency offset (CFO) destroys the orthogonality among subcarriers which degrades system performance. Various CFO estimation methods have ... In orthogonal frequency-division multiplexing (OFDM) systems, the carrier frequency offset (CFO) destroys the orthogonality among subcarriers which degrades system performance. Various CFO estimation methods have been developed to compensate for the CFO at the receiver. This paper describes a novel minimum output variance method for OFDM systems with CFO in additive white Gaussian noise channels. This method utilizes the phase and the amplitude of the received signal and reduces the mean square error of the CFO by about 3 dB compared with the original minimum output variance method. 展开更多
关键词 carrier frequency offset (CFO) orthogonal frequency-division multiplexing (OFDM) additive white gaussian noise (AWGN) minimum output variance (MOV)
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