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Quadrature OFDMA Systems

Quadrature OFDMA Systems

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Jian Andrew Zhang Lin Luo Zhenning Shi Wireless Signal Processing Program NICTA Canberra Australia Research School of Information Science and Engineering Australian National University Australia

In current OFDMA systems, three major problems arise due to the large number of subcarriers, including high peak to average power ratio (PAPR), sensitivity to carrier frequency offset (CFO), and high complexity in user terminal. In this paper, based on an innovative concept of Layered FFT structure , we propose novel quadrature OFDMA system which can overcome these problems. In particular, the proposed system can achieve same guard-interval overhead and same bandwidth occupation to conventional OFDMA schemes, while with significantly reduced complexity and power consumption in user terminals. Simulation results show that the proposed quadrature OFDMA system can achieve similar and even better performance than conventional OFDMA systems, particularly when a minimum mean square error (MMSE) equalizer is applied.

关键词： Peak to average power ratio Australia OFDM Frequency diversity Transmitters signal processing Bandwidth Energy consumption Space technology Bit error rate

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Iterative Channel Estimation for IDMA Systems in Time-Varying Channels

Iterative Channel Estimation for IDMA Systems in Time-Varyin...

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Xiangyun Zhou Zhenning Shi Mark C. Reed Wireless Signal Processing Program NICTA Australia Research School of Information Sciences and Engineering Australian National University Braddon ACT Australia

In this paper, we develop low-complexity iterative channel estimation techniques for emerging IDMA systems. The channel estimators make use of pilots as well as soft decoded data information. We derive a lower bound for channel estimation error that reflects the reliability of soft decoded data. We show that the estimators perform close to a minimum variance unbiased estimator as the mean square error (MSE) approaches the lower bound. Numerical results on the MSE and BER performance also show that the proposed channel estimators are able to track the time-varying channel states.

关键词： Channel estimation Time-varying channels Iterative decoding Multiaccess communication Multiuser detection Fading Transmitters Australia Mean square error methods Bandwidth

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Galileo E1 OS and GPS L1C pseudo random noise codes - Requirements, generation, optimization and comparison -

Galileo E1 OS and GPS L1C pseudo random noise codes - Requir...

引用

20th International Technical Meeting of the Satellite Division of The Institute of Navigation 2007 ION GNSS 2007

作者： Wallner, Stefan Avila-Rodriguez, Jose-Angel Hein, Guenter W. Rushanan, Joseph J. Institute of Geodesy and Navigation University FAF Munich Germany MITRE Corporation United States Institute of Geodesy and Navigation University ot the Federal Armed Forces Germany Munich Germany Institute of Geodesy and Navigation University of the Federal Armed Forces Munich Germany Galileo Program Signal Processing Section Omitre Corporation United Kingdom

ISBN: (纸本)9781605600697

With the introduction of the future Galileo signals as well as with GPS L1C, new Pseudo Random Noise (PRN) Code structures that are not based on Linear Feedback Shift Registers (LFSR) will be employed for the very first time in the history of civilian GNSS. Instead of this well known code generation approach, completely different schemes will be followed by both GPS and Galileo. GPS L1C will use Weil-based codes derived from a single Legendre sequence while the Galileo E6 CS and E1 OS signals will implement random codes optimized via genetic algorithms. Since these are two completely different procedures for code optimization, this paper will try to shed some light on both code designs. Furthermore, this paper will present pros and cons of both designs. Finally, in order to have the fairest comparison between both approaches, sample code sets have been generated using the two schemes. As GPS L1C and Galileo E1 OS will transmit their signals at a center frequency of 1575.42 MHz with an identical Power Spectral Density (PSD) of MBOC(6,1,1/11) it is obvious that both PRN code families could potentially affect each other. This paper will also deal with this topic. For simplicity in the notation, we will refer to this aspect as intersystem crosscorrelation.

关键词： Global positioning system

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Multiband-OFDM UWB vs IEEE802.11n: System level design considerations

Multiband-OFDM UWB vs IEEE802.11n: System level design consi...

引用

2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring

作者： Ying, Chen Jian, Zhang Jayalath, A.D.S. Wireless Signal Processing Program National ICT Australia

ISBN: (纸本)0780393929

Both Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra Wideband (UWB) technology and Multiple-Input Multiple Output (MIMO)-OFDM technology have been proposed for future wireless communications systems, supporting data-rates in excess of 100Mbps. These two technologies use two different mechanisms to boost the data-rate. In this paper we analyse the relative advantage, performances and implementation issues of MIMO-OFDM based next generation wireless LAN systems (IEEE 802.11n) and MB-OFDM UWB based next generation wireless PAN systems (OFDM-UWB). In this comparison, we will see that the distinctive differences between OFDM-UWB and IEEE 802.11n technologies lead to significant variations in the performances and different hardware requirements. © 2006 IEEE.

关键词： Broadband networks

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Sub-optimal power allocation for MIMO channels

Sub-optimal power allocation for MIMO channels

引用

IEEE International Symposium on Information Theory

作者： Hanlen, Alex GrantLeif Institute for Telecommunications Research University of South Australia Australia Wireless Signal Processing Program National ICT Australia

ISBN: (纸本)9781424405053

We consider t-input r-output Rayleigh fading channels with transmit-sided correlation, where the receiver knows the channel realizations, and the transmitter only knows the channel statistics. Using Lagrange duality, we develop an easily computable, tight upper bound on the loss in information rate due to the use of any given input covariance for this channel. This bound is applied to two simple transmission strategies. The first strategy is a reduced-rank uniform allocation, in which independent, equal power Gaussian symbols are transmitted on the αt strongest eigenvectors of the transmit covariance matrix, where 0 ≤ α ≤ 1 is chosen to optimize the resulting information rate. The second strategy is water-filling on the eigenvalues of the transmit covariance matrix. The upper bound on loss shows these strategies are nearly optimal for a wide range of signal to noise ratios and correlation scenarios. © 2006 IEEE.

关键词： MIMO systems

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Multiband-OFDM UWB vs IEEE802.11n: System Level Design Considerations

Multiband-OFDM UWB vs IEEE802.11n: System Level Design Consi...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Ying Chen Jian Zhang A.D.S. Jayalath Wireless Signal Processing Program NICTA Australia

Both multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) technology and multiple-input multiple output (MIMO)-OFDM technology have been proposed for future wireless communications systems, supporting data-rates in excess of 100 Mbps. These two technologies use two different mechanisms to boost the data-rate. In this paper we analyse the relative advantage, performances and implementation issues of MIMO-OFDM based next generation wireless LAN systems (IEEE 802.11n) and MB-OFDM UWB based next generation wireless PAN systems (OFDM-UWB). In this comparison, we will see that the distinctive differences between OFDM-UWB and IEEE 802.11n technologies lead to significant variations in the performances and different hardware requirements

关键词： System-level design Bandwidth Wireless LAN Radio transmitters Ultra wideband technology signal processing Wireless communication Personal area networks OFDM modulation Radio frequency

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On the use of time-frequency representation in multicomponent signal separation

On the use of time-frequency representation in multicomponen...

引用

IEEE International Conference on Multimedia and Expo (ICME 2006)

作者： Barkat, Braham Sattar, Farook Abed-Meraim, Karim Acad Directorate Petroleum Inst Elect Engn Program Abu Dhabi U Arab Emirates Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore Telecom Paris Signal & Image Processing Dept Paris France

ISBN: (纸本)9781424403660

In this paper, we address the problem of separating unknown multicomponent signals from their instantaneous mixtures. Using linear time-frequency (TF) representation of the mixtures along with vectors classification scheme provide us a simple and efficient technique to separate multicomponent signals. The proposed algorithm can handle monocomponent as well as multicomponent sources and its assumptions about the mixing matrix are more relaxed compared to other existing TF based algorithms. The source separation results for the mixed synthetic signals as well as mixed real audio signals, such as mixture of speech and music, are shown to illustrate the validity and efficiency of the proposed scheme.

关键词： signal processing

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Sub-optimal Power Allocation for MIMO Channels

Sub-optimal Power Allocation for MIMO Channels

引用

IEEE International Symposium on Information Theory

作者： Alex J. Grant Leif W. Hanlen Institute for Telecommunications Research University of South Australia Australia Wireless Signal Processing Program NICTA Australia

ISBN: (纸本)142440505X

We consider t-input r-output Rayleigh fading channels with transmit-sided correlation, where the receiver knows the channel realizations, and the transmitter only knows the channel statistics. Using Lagrange duality, we develop an easily computable, tight upper bound on the loss in information rate due to the use of any given input covariance for this channel. This bound is applied to two simple transmission strategies. The first strategy is a reduced-rank uniform allocation, in which independent, equal power Gaussian symbols are transmitted on the at strongest eigenvectors of the transmit covariance matrix, where 0 les alpha les 1 is chosen to optimize the resulting information rate. The second strategy is water-filling on the eigenvalues of the transmit covariance matrix. The upper bound on loss shows these strategies are nearly optimal for a wide range of signal to noise ratios and correlation scenarios

关键词： MIMO Upper bound Information rates Covariance matrix Fading Transmitters Statistics Lagrangian functions Eigenvalues and eigenfunctions signal to noise ratio

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Generalized Broadband Beamforming Using a Modal Decomposition

Generalized Broadband Beamforming Using a Modal Decompositio...

引用

International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： M.I.Y. Williams T.D. Abhayapala R.A. Kennedy Wireless Signal Processing Program National ICT Australia Department of Information Engineering Australian National University Australia

We propose a new broadband beamformer design technique which produces an optimal beampattern for any set of samples in space and time. The modal subspace decomposition (MSD) technique is based on projecting a desired pattern into the subspace of patterns achievable by a particular set of space-time sampling positions. This projection is the optimal achievable pattern, in the sense that it minimizes the mean-squared error (MSE) between the desired and actual patterns. The main advantage of the technique is versatility as it can produce optimal beamformers for both sparse and dense arrays, non-uniform and asynchronous time sampling, and dynamic arrays where sensors can move throughout space. It can also be applied to any beampattern type, including frequency-invariant and spot pattern design

关键词： Array signal processing Sensor arrays Frequency Sampling methods Australia Acoustic sensors Narrowband Discrete Fourier transforms signal processing Design engineering

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Dependence of MIMO System Performance on the Joint Properties of Angular Power

Dependence of MIMO System Performance on the Joint Propertie...

引用

IEEE International Symposium on Information Theory

作者： Terence Betlehem Tharaka A. Lamahewa Thushara D. Abhayapala Research School of Information Science and Engineering Australian National University Australia Wireless Signal Processing Program NICTA Canberra Australia

ISBN: (纸本)142440505X

In this paper, we use a novel MIMO channel model to characterize the dependence of ergodic capacity and diversity order on the joint statistics of the angular power density. The scattering environment of a MIMO channel is characterized by a double directional angular power distribution, describing the power transferred in each direction from transmitter aperture to receiver aperture. Angular power, which is typically separable Kronecker-modelled, is here generalized to include joint distribution properties using well-known bivariate probability density functions. We show that the joint properties of the power density, namely the shape and the orientation of power distribution contours, have significant impact on capacity and diversity of non-line-of-sight (NLOS) channels

关键词： MIMO System performance Power distribution Apertures Power system modeling Statistical distributions Scattering Transmitters Probability density function Shape

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