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2005 Australian Communications Theory Workshop

2-4 Feb. 2005

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Displaying Results 1 - 25 of 55
  • Proceedings. 6th Australian Communications Theory Workshop 200 (IEEE Cat. No.05EX1031C)

    Publication Year: 2005, Page(s): C1
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  • [Blank page]

    Publication Year: 2005, Page(s): i
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  • [Breaker page]

    Publication Year: 2005, Page(s): ii
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  • Preface [to the 2005 Australian Communications Theory Workshop]

    Publication Year: 2005, Page(s):iii - vii
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    Publication Year: 2005, Page(s): viii
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  • Table of contents

    Publication Year: 2005, Page(s):ix - xi
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    Publication Year: 2005, Page(s): xii
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  • Interleaver and Accumulator Design for Systematic Repeat-Accumulate Codes

    Publication Year: 2005, Page(s):1 - 7
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (425 KB) | HTML iconHTML

    Recent promising theoretical results for repeat-accumulate (RA) codes, together with their extremely simple encoding, motivates this investigation into the design and implementation of practical RA codes. We consider two main issues: the construction of the interleaver in fixed length codes using combinatorial designs; and the improvement of the error floor performance of RA codes by modifying the... View full abstract»

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  • Performance of convolutional interleavers with different spacing parameters in turbo codes

    Publication Year: 2005, Page(s):8 - 12
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (677 KB) | HTML iconHTML

    This paper considers application of a convolutional interleaver and the issue of influence of the space parameter in the turbo code performance. Similarly to previously considered convolutional interleavers, the new interleavers are designed as block interleavers and their performance in different code structures is compared with the interleaver having higher periods and space value of 1. In each ... View full abstract»

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  • Blind nonlinear source separation using EKENS learning and MLP network

    Publication Year: 2005, Page(s):13 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB) | HTML iconHTML

    We propose an equivariant kernel nonlinear separation (EKENS) learning algorithm to extract independent sources from their nonlinear mixtures. Generally, unmixing signals from the nonlinear model in an unsupervised manner is very complicated, because both the nonlinear mapping and the sources distribution are not-known apriori, and should be learned from the observations. The observations are mode... View full abstract»

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  • Exact probability of error of ST-coded OFDM systems with frequency offset in flat Rayleigh fading channels

    Publication Year: 2005, Page(s):21 - 27
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (449 KB) | HTML iconHTML

    In this paper, we analyze the error performance of single-input-single-output (SISO) and space-time coded (ST-coded) orthogonal frequency division multiplexing (OFDM) systems with carrier frequency offset (CFO) in frequency-flat Rayleigh fading channels. Exact analytical expressions are derived for the symbol error probability (SEP) for BPSK and QPSK modulation schemes. The analysis presented has ... View full abstract»

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  • Upper-bound for the pairwise error probability of space-time codes in physical channel scenarios

    Publication Year: 2005, Page(s):28 - 34
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (326 KB) | HTML iconHTML

    In this paper, we derive an upper-bound for the pair-wise error probability of space-time codes which captures the effects of the transmitter and the receiver antenna configurations (antenna separation and antenna geometry) and the surrounding scattering distributions at the transmitter and the receiver antenna arrays. This new upper-bound allows investigation of the individual effects of antenna ... View full abstract»

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  • Truncated maximal ratio combining for iterative multiuser decoding

    Publication Year: 2005, Page(s):35 - 41
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB) | HTML iconHTML

    In this paper, the concept of information combining is investigated for iterative multiuser decoding. This is done by applying recursive maximal ratio combining (MRC) over iterations to interference cancellation based multiuser detectors. Here, we show that combining over all iterations may not be appropriate as correlations build up. Numerical results show that applying MRC only over the first fe... View full abstract»

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  • A subspace predictive controller for end-to-end TCP congestion control

    Publication Year: 2005, Page(s):42 - 48
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB) | HTML iconHTML

    In this paper we present a subspace-based model-free LQG linear congestion controller for TCP, intended as a viable alternative to its classically designed model-based counterpart. The model-free controller is derived from TCP Vegas and is constructed directly from experimental data, without requiring a plant model. We show the controller possesses the same equilibrium behaviour as Vegas, while of... View full abstract»

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  • A periodogram-based matching technique for modulation recognition

    Publication Year: 2005, Page(s):49 - 55
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB) | HTML iconHTML

    In this paper we develop a method for identifying the modulation type of a communications waveform, using a method that exploits the power spectral density properties of such waveforms. This approach may be employed regardless of the type of modulation schemes in use, whether analogue or digital and thus provides a significant advantage over previous attempts at general modulation classification View full abstract»

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  • Computation of capacity for Gilbert-Elliott channels, using a statistical method

    Publication Year: 2005, Page(s):56 - 61
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (830 KB) | HTML iconHTML

    A simple statistical method has been presented for evaluation of capacity for Gilbert-Elliott channels. Moreover, it has been shown that the time-varying binary symmetric channel, as a basic model for some wireless communication channels, is a special case of Gilbert-Elliott channel. Using the simple statistical method, the capacity of this channel has been calculated over the range of parameters ... View full abstract»

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  • Bounds on mutual information of Rayleigh fading channels with Gaussian input

    Publication Year: 2005, Page(s):62 - 67
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB) | HTML iconHTML

    The mutual information of a discrete time Rayleigh fading channel is considered, where neither the transmitter nor the receiver has the knowledge of the channel state information. We specifically derive a lower bound for the mutual information of this channel when the input distribution is Gaussian. The bound is expressed in terms of the capacity of the corresponding non fading channel and the cap... View full abstract»

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  • Linear symbol precoding for low complexity V-BLAST OFDM systems

    Publication Year: 2005, Page(s):68 - 72
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB) | HTML iconHTML

    In this paper we propose a low complexity linear precoded Vertical Bell Labs Layered Space-Time (V-BLAST) orthogonal frequency division multiplexing (OFDM) system based on QR decomposition. A conventional uncoded V-BLAST OFDM system exhibits significant system degradation in a frequency selective fading channel as it does not fully exploit the available frequency diversity. The new preceded scheme... View full abstract»

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  • Performance of V-BLAST MIMO-OFDM Systems with Carrier Frequency Offset

    Publication Year: 2005, Page(s):73 - 78
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (238 KB) | HTML iconHTML

    In this paper we study the effects of carrier frequency offset (CFO) on the performance of a Vertical Bell Labs Layered Space-Time (V-BLAST) orthogonal frequency multiplexing (OFDM) system. It is shown that CFO introduced intercarrier interference (ICI) can cause significant performance degradation. ICI makes initial signal detection unreliable and introduces error propagation for the subsequent i... View full abstract»

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  • Performance of nonuniform M-ary QAM constellation on nonlinear channels

    Publication Year: 2005, Page(s):79 - 83
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (633 KB) | HTML iconHTML

    This paper investigates the effects of the nonequiprobable distribution of a high bandwidth efficiency M-ary QAM signal constellation on the error performance for nonlinear channels. A simple nonlinear channel model where the phase and amplitude of the transmitted samples are distorted by a nonlinear function with additive white Gaussian noise (AWGN) in the downlink was simulated. Simulation resul... View full abstract»

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  • A new class of parallel data convolutional codes

    Publication Year: 2005, Page(s):84 - 88
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB) | HTML iconHTML

    We propose a new class of parallel data convolutional codes (PDCCs) in this paper. The PDCC encoders inputs are composed of an original block of data and its interleaved version. A novel single self-iterative soft-in/soft-out a posteriori probability (APP) decoder structure is proposed for the decoding of the PDCCs. Simulation results are presented to compare the performance of PDCCs to that of pa... View full abstract»

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  • A novel carrier estimation algorithm for OFDM communication systems

    Publication Year: 2005, Page(s):89 - 94
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB) | HTML iconHTML

    A new pilot assisted (PA) carrier frequency offset (CFO) estimation algorithm for OFDM communication system is presented in this paper. This algorithm extends the principle of the discrete Fourier transform (DFT) based single carrier frequency estimation algorithm in S. Reisenfeld and E. Aboutanios (2003). The proposed algorithm comprises of two steps, first a coarse CFO estimator such as the one ... View full abstract»

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  • On entropy measures for dynamic network topologies: limits to MANET

    Publication Year: 2005, Page(s):95 - 101
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB) | HTML iconHTML

    What are the fundamental limits on the communications potential of wireless networks? We contend that quantifying topological dynamics resulting from node movement enables one to: find the minimum overhead required by the network to maintain connectivity and, calculate the communication potential of the network. A mobility metric is proposed for the unbiased comparison of networks. This is an entr... View full abstract»

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  • Ka band Propagation Experiments on the Australian Low-Earth Orbit Microsatellite “ FedSat ”

    Publication Year: 2005, Page(s):102 - 106
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (598 KB) | HTML iconHTML

    Previous Ka band communication experiments have been limited to the observation of geostationary satellites, such as ACTS and OLYMPUS, or have been kept commercial in confidence (Iridium). The Ka band payload on the Australian "FedSat" LEO microsatellite has opened up an opportunity to conduct novel Ka band propagation measurements at varying pointing angles, with the additional challenge of preci... View full abstract»

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  • Log domain implementation of the dual-APP algorithm

    Publication Year: 2005, Page(s):107 - 111
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB) | HTML iconHTML

    For high rate codes, an a posteriori probability (APP) algorithm working on the dual code is preferable. The challenge involved in log domain implementation of this algorithm due to the presence of negative valued metrics is highlighted. To represent these metrics, a new representation system is proposed in place of the existing sign-magnitude representation. A generalised model of a trellis based... View full abstract»

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