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New robust ICI estimation using distributive PM-sequences in OFDM systems

New robust ICI estimation using distributive PM-sequences in...

引用

IEEE Conference on Wireless communications and Networking

作者： Hsiao-Chun Wu Songnan Xi Yiyan Wu Communications and Signal Processing Laboratory Department of Electrical and Computer Engineering Louisiana State University Baton Rouge USA Communications Rcscarch Centre Ottawa ONT Canada

The intercarrier interference (ICI) matrix for the orthogonal frequency division multiplexing (OFDM) systems usually has a fairly large dimension and changes over time for mobile communications. Obviously, the traditional least-square solution for the ICI matrix estimation based on the pseudo-inverse operation has its limitation. In addition, the provision of a sufficiently long training sequence to estimate the complete ICI matrix is not feasible, since it will result in severe throughput reduction. In this paper, we design padded maximum-length shift-register sequences (pm-sequences) to serve as the training sequences for the ICI estimation. Such new training sequences will induce the diagonal correlation matrices which can lead to the optimal estimation. We propose a new distributive allocation scheme of short pm-sequences for the ICI estimation with a linear ICI estimate interpolation, which can lead to the multi-ICI-vector estimation to combat the realistic non-circulant ICI matrix problem, where almost all other existing schemes such as the ICI matrix estimation using the Hadamard sequences, the convolutional coder/decoder and the ICI self-cancellation coder/decoder could not perform effectively

关键词： Robustness OFDM Decoding Interference Mobile communication Throughput Interpolation Error correction Error correction codes Convolutional codes

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Optimal Rate Filters for Biomedical Point Processes

Optimal Rate Filters for Biomedical Point Processes

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： J. McNames Biomedical Signal Processing Laboratory Electrical & Computer Engineering Department Portland State University Portland OR USA

Rate filters are used to estimate the mean event rate of many biomedical signals that can be modeled as point processes. Historically these filters have been designed using principles from two distinct fields. signal processing principles are used to optimize the filter's frequency response. Kernel estimation principles are typically used to optimize the asymptotic statistical properties. This paper describes a design methodology that combines these principles from both fields to optimize the frequency response subject to constraints on the filter's order, symmetry, time-domain ripple, DC gain, and minimum impulse response. Initial results suggest that time-domain ripple and a negative impulse response are necessary to design a filter with a reasonable frequency response. This suggests that some of the common assumptions about the properties of rate filters should be reconsidered

关键词： Finite impulse response filter Kernel IIR filters signal processing Frequency response Biomedical signal processing Nonlinear filters Design methodology Constraint optimization Design optimization

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Blind source extraction of instantaneous noisy mixtures using a linear predictor

Blind source extraction of instantaneous noisy mixtures usin...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Wei Liu D.P. Mandic A. Cichocki Communications Research Group Department of Electronic and Electrical Engineering University of Sheffield UK Communications and Signal Processing Research Group Department of Electrical & Electronic Engineering Imperial College London UK Laboratory for Advanced Brain Signal Processing RIKEN Brain Science Institute Japan

The blind source extraction (BSE) problem for noisy measurements is addressed using the linear predictor method. Based on a previously proposed method for the noise-free case, we propose a cost function with the effect of noise removed. Two adaptive algorithms are next introduced, one of which is based on minimisation of the normalised mean square prediction error (MSPE), whereas the other minimises the MSPE using prewhitening followed by regularisation of the demixing vector. The successful operation of these algorithms requires the knowledge of the correlation matrix of noise

关键词： Cost function Additive noise Vectors Working environment noise signal processing Adaptive algorithm Higher order statistics Educational institutions Laboratories Electric variables measurement

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Blind channel shortening for SIMO space-time channels using linear prediction in OFDM systems

Blind channel shortening for SIMO space-time channels using ...

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International Symposium on Telecommunications

作者： A. S. Menezes C. M. Panazio J. M. T. Romano Signal Processing for Communications Laboratory School of Electrical and Computer Engineering State University of Campinas Brazil Laboratory of Communications and Signals Faculty of Electrical Engineering Escola Politécnica da Universidade de São Paulo Brazil

In this paper, we make use of a blind adaptive linear predictor for channel shortening in single input multiple output (SIMO) channels. We compare our approach to the so-called MERRY blind channel shortener. We assess through simulations that our proposed approach provides faster convergence rate and it better exploits the spatio-temporal diversity present in the SIMO channels.

关键词： OFDM modulation Equalizers Fast Fourier transforms Convolution Receiving antennas Transmitting antennas Convergence Wireless LAN Digital video broadcasting Demodulation

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WLC43-4: Comparing the effect of Carrier Frequency Offset on OFDM and Single-Carrier Block Transmission in AWGN Channels

WLC43-4: Comparing the effect of Carrier Frequency Offset on...

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IEEE Globecom 2006

作者： Pan Liu Yeheskel Bar-Ness Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Both OFDM and single-carrier block transmission (SCBT) are promising candidates for the future high date rate communication, which well handle the frequency selective channels with a low implementation complexity. However, the sensitivity to carrier frequency offset, caused by Doppler effect or the carrier frequency difference between transmitter and receiver, is always a major concern of these block transmission systems. Actually, a controversy in comparing the carrier frequency offset effect on OFDM and SCBT systems has already been witnessed in the literature for a long time. In this paper, we first analyze the effects of carrier frequency offset on these two systems, then by carefully investigating existing works, we classify the problem into two categories: carrier frequency offset analysis with compensation and without compensation. Finally, we draw conclusions based on theoretical and numerical results that the BER performance of OFDM systems is more sensitive to carrier frequency offset than SCBT systems for the BPSK modulation in AWGN channels, although the difference of the BER performance between two systems is much smaller than theoretically predicted in previous works, if a fair comparison environment is used. Moreover, this small performance gap vanishes in higher level constellation like QPSK.

关键词： AWGN channels OFDM modulation Bit error rate Frequency estimation Binary phase shift keying Quadrature phase shift keying DSL Digital video broadcasting Frequency conversion Wireless communication

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On the Sum-Rate of Broadcast Channels with Outdated 1-Bit Feedback

On the Sum-Rate of Broadcast Channels with Outdated 1-Bit Fe...

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Asilomar Conference on signals, Systems & computers

作者： Bo Niu Osvaldo Simeone Oren Somekh Alexander M. Haimovich Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

In this paper, a single-input single-output (SISO) downlink channel with K users is analyzed in the presence of Rayleigh flat fading. A limited channel state information (CSI) feedback scheme is considered, where only an outdated 1-bit feedback per user is available at the base station for each fading block. A closed-form expression for the achievable ergodic sum- rate of the 1-bit feedback scheme is presented for any number of users, as a function of the fading temporal correlation coefficient, the threshold of the 1-bit CSI quantizer and the SNR. It is proved that the sum-rate scales with increasing number of users as log log K, which is the same scaling law achieved by the optimal non-delayed full CSI feedback scheme. In addition, the sum-rate degradation due to outdated CSI is evaluated in the asymptotic regimes of either large K or low SNR.

关键词： Broadcasting Feedback Fading Base stations Delay Rayleigh channels Downlink Degradation Feeds Optimal scheduling

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Optimal Training Sequences For Efficient MIMO Frequency-Selective Fading Channel Estimation

Optimal Training Sequences For Efficient MIMO Frequency-Sele...

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IEEE Sarnoff Symposium

作者： Shuangquan Wang Ali Abdi Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (纸本)9781424400027

In this paper, novel channel estimation schemes using uncorrelated periodic complementary sets of unitary sequences are proposed for multiple-input multiple-output (MIMO) frequency-selective fading channels. When the additive noise is Gaussian, the proposed best linear unbiased estimator (BLUE) achieves the minimum possible classical Cramer-Rao lower bound (CRLB), if the channel coefficients are regarded as unknown deterministics. On the other hand, the proposed linear minimum mean square error (LMMSE) estimator attains the minimum possible Bayesian CRLB, when the underlying channel coefficients are Gaussian and independent of the additive Gaussian noise. The proposed channel estimators can be implemented with very low complexity via FFT, which makes them very suitable for practical systems such as, but not limited to, MIMO orthogonal frequency division multiplexing (MIMO-OFDM) systems.

关键词： MIMO Frequency-selective fading channels Frequency estimation Additive noise Channel estimation Mean square error methods Bayesian methods Gaussian noise Wireless communication signal processing

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Correlation Analysis of Instantaneous Mutual Information in 2 × 2 MIMO Systems

Correlation Analysis of Instantaneous Mutual Information in ...

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Annual Conference on Information Sciences and Systems (CISS)

作者： Shuangquan Wang Ali Abdi Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

In this paper, the second-order statistics such as the autocorrelation function and correlation coefficient of the instantaneous mutual information (IMI) are studied, in 2times2 multiple-input multiple-output (MIMO) time-varying Rayleigh flat fading channels, assuming general non-isotropic scattering environments. Exact closed-form expressions are derived, as well as asymptotic approximations in low- and high-SNR regimes. Monte Carlo simulations are provided to verify the accuracy of those derived analytical results.

关键词： Information analysis Mutual information MIMO Fading Feedback signal analysis Autocorrelation Random processes Wireless communication Rayleigh scattering

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Effects of Phase Noise at Both Transmitter and Receiver on the Performance of OFDM Systems

Effects of Phase Noise at Both Transmitter and Receiver on t...

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Annual Conference on Information Sciences and Systems (CISS)

作者： Pan Liu Yeheskel Bar-Ness Jianming Zhu Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

OFDM system suffers from significant performance degradation due to the presence of phase noise, which causes the common phase error (CPE) and intercarrier interference (ICI) among subcarriers. Various phase noise analysis and mitigation schemes were presented for OFDM in the literature, which only concerned with phase noise generated at the receiver, assuming the transmitter noise is negligible. However, this is inappropriate for the uplink application, where transmitter employs relatively low cost local oscillators. In this paper, we aim to analyze an OFDM system with phase noise at both transmitter and receiver in a WSSUS multipath fading channel. Results show that such system is equivalent to an OFDM system with phase noise at receiver only, hence simplifies the system model and provides an easy way to examine phase noise effect at both transmitter and receiver.

关键词： Phase noise Transmitters OFDM Fading Costs Local oscillators Digital video broadcasting Wireless communication Degradation Interference

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AN ANALYSIS OF THE CCA APPROACH FOR BLIND SOURCE SEPARATION AND ITS ADAPTIVE REALIZATION

AN ANALYSIS OF THE CCA APPROACH FOR BLIND SOURCE SEPARATION ...

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Proceedings of 2006 IEEE International Symposium on Circuits and Systems,Volume 7

作者： Wei Liu Dcmilo P. Mandic Andnej Cichocki Department of Electronic & Electrical Engineering University of Sheffield UK Communications and Signal Processing Research Group Department of Electrical & Electronic Engineering Imperial College London London UK Laboratory for Advanced Brain Signal Processing Brain Science Institute RIKEN Japan

An analysis of the canonical correlation analysis (CCA) approach in blind source separation is provided. In particular, it is proved that by maximizing the autocorrelation functions of the recovered signals we can separate the source signals successfully. We show that the CCA approach represents the same generalised eigenvalue decomposition problem introduced in the matrix pencil method. Finally, an adaptive blind source extraction (BSE) algorithm is derived as an online realisation of the CCA approach. Simulation results verify the proposed approach.

关键词： Blind source separation Covariance matrix Source separation Adaptive signal processing Autocorrelation Matrix decomposition signal processing algorithms Statistical distributions Educational institutions Laboratories

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