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ICI elimination of M-band wavelet multi-carrier modulation system

Journal of Shanghai University(English Edition) 2010年第1期14卷 6-11页

作者：彭章友刘艳艳张兴 School of Communication and Information Engineering Shanghai University

To solve the inter carrier interference （ICI） elimination problem of an M-band wavelet multi-carrier modulation system, this paper analyzes the principle of the ICI caused by the Doppler frequency shift and its mathematical expression based on the M-band wavelet multi-carrier modulation system model. Through the analysis of the mathematical expression and combining with the perfect reconstruction conditions of the filter banks, we propose the design conditions of an M-band filter to reduce and eliminate the ICI. The impulse response model of the filter design conditions and an iterative algorithm is also established. The simulation results show that the proposed ICI reduction and elimination methods can effectively improve the system performance.

关键词： M-band wavelet multi-carrier modulation Doppler frequency shift inter carrier interference (ICI) impulseresponse

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Decision-Aided Extended Kalman Filter Based Adaptive Timing Recovery for Wavelet Packet Modulated Signals

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Tsinghua Science and Technology 2010年第3期15卷 329-334页

作者：孙懿郝久玉 School of Electronic Information Engineering Tianjin University

One of the major issues with multi-carrier systems is their vulnerability to timing synchronization errors resulting in the loss of time synchronization which causes loss of orientation of incoming data at the receiver. This paper presents an acquisition algorithm to timing recovery using the decision-aided extended Kalman filtering （EKF） technique for nonlinear disturbance channels in a wavelet packet transform-based multicarrier modulation communication system. This timing recovery algorithm gives faster convergence, smaller root mean square （RMS） errors, and better bit error rate （BER） performance than traditional timing recovery methods, such as the phase-locked loop （PLL）, maximum likelihood （ML）, and Kalman filter （KF） methods. Thus, the algorithm is able to handle larger timing errors more reliably and to provide better timing recovery, since the scheme takes into account the nonlinear relationship between the signal samples and timing errors. Simulations for various time-varying channels show that the timing recovery algorithm works well for wavelet packet transform-based multicarrier modulation communication systems.

关键词： wavelet packet transform multi-carrier modulation adaptive timing recovery extended Kalman filter

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The Performance Analysis of the Wavelet-OFDM New Scheme in AWGN Channel

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Journal of Physical Science and Application 2014年第2期4卷 100-106页

作者： Alaa Ghaith Rima Hatoum Hiba Mradand Ali Alaeddine Electronics and Physics Department Faculty of Sciences L Lebanese University Beirut Hadath 65 73-14 Lebanon

Orthogonal frequency division multiplexing （OFDM） is a special form of multi-carrier transmission that uses the policy of divide and rule. In this scheme, a large number of orthogonal, overlapping, narrow band sub-channels （subcarriers） are transmitted in parallel and divide the available transmission bandwidth. This techniqueis originally based on the Fast Fourier Transform of the information data. In order to improve the performance of the OFDM and overcome some limitations, an alternative OFDM approach based on the Wavelet Transform is proposed. In this paper, we study the performance of such systems in additive white Gaussian channel （AWGN）. MATLAB simulations are realized and performance comparisons are presented.

关键词： multi-carrier modulation discrete wavelet transform OFDM. wavelet packet transform Fourier-based OFDM wavelet-based

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