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IET Signal Processing

Issue 1 • Date January 2009

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Displaying Results 1 - 10 of 10
  • Non-sensitive adaptive beamforming against mutual coupling

    Publication Year: 2009, Page(s):1 - 6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (165 KB)

    The standard Capon beamformer (SCB) is known to suffer from severe performance degradation when there is a mismatch between the presumed signal steering vector and the actual one. There may be several reasons leading to this result such as mutual coupling between array elements. The problem of adaptive beamforming in the presence of mutual coupling is studied based on a uniform linear array (ULA).... View full abstract»

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  • Discrete frequency-coded radar signal design

    Publication Year: 2009, Page(s):7 - 16
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (786 KB)

    A modified simulated annealing algorithm (MSAA) is proposed as combinatorial multivariable optimisation technique to design discrete frequency-coding (DFC) sequence sets with good auto- and cross-correlation properties. The proposed algorithm is a combination of simulated annealing and Hamming scan algorithm. MSAA has global minimum estimation capability of simulated annealing and fast convergence... View full abstract»

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  • New applications of transponder in focusing distributed synthetic aperture radar data

    Publication Year: 2009, Page(s):17 - 22
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (451 KB)

    High-precision phase synchronisation or compensation techniques must be provided for distributed synthetic aperture radar (DiSAR), which operates with separate transmitters and receivers. The use of a novel transponder that was proposed for calibrating high-resolution imaging radars to compensate oscillator frequency instability is investigated here. This transponder modulates the radar pulses in ... View full abstract»

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  • Block-based fuzzy step size nlms algorithms for subband adaptive channel equalisation

    Publication Year: 2009, Page(s):23 - 32
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (640 KB)

    Judicious selection of the step size parameter is crucial for adaptive algorithms to strike a good balance between convergence speed and misadjustment. The fuzzy step size (FSS) technique has been shown to improve the performance of the classical fixed step size and variable step size (VSS) normalised least mean square (NLMS) algorithms. The performance of the FSS technique in the context of subba... View full abstract»

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  • Receiver window designs for radio frequency interference suppression in DMT systems

    Publication Year: 2009, Page(s):33 - 39
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (387 KB)

    Windowing is often applied at the DMT (discrete multitone) receiver to suppress radio frequency interference (RFI). The spectral roll-off of the window determines how neighbouring tones are affected by RFI. However, the roll-off of the window is not of equal importance in all frequency range. In particular, the roll-off in high frequency will be inconsequential when the side lobes are so small tha... View full abstract»

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  • Harmonic power detection in wideband cognitive radios

    Publication Year: 2009, Page(s):40 - 50
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (831 KB)

    An analysis for simultaneous sensing of multiple primary user activity in cognitive radios has been presented here from a signal-processing perspective. First, the drawbacks of using simple harmonic power detection in wideband cognitive radios is demonstrated. Then, the impact of preprocessing the received signal to improve detection performance is highlighted along with its tradeoff involving com... View full abstract»

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  • Composite spectrogram using multiple Fourier transforms

    Publication Year: 2009, Page(s):51 - 63
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (659 KB)

    The authors propose a time-frequency (T-F) analysis method that uses a time- and frequency-dependent resolution to represent a signal. The method is based on the idea of splitting the T-F plane into equal-TF-area Heisenberg boxes in some optimal way that closely matches spectral events. Compared with existing methods based on orthogonal decompositions, by lifting the orthogonality constraint, extr... View full abstract»

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  • Efficient estimation algorithm for ARMA, exponential and other trigonometric model with quantum constraints

    Publication Year: 2009, Page(s):64 - 73
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (575 KB)

    A new estimation algorithm has been developed here, which refers to covariance shaping least square estimation (CSLS) based on the quantum mechanical concepts and constraints. The algorithm has been applied to ARMA, complex exponential, sine, cosine and sinc models with various parameter values. The same models can be applied with white Gaussian noise, which estimates the bias in the parameter and... View full abstract»

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  • Bias analysis of MUSIC in the presence of mutual coupling

    Publication Year: 2009, Page(s):74 - 84
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (491 KB)

    The effect of mutual coupling in antenna elements heavily deteriorates the performance of existing array-based bearing-finding methods. Such a bias of MUSIC in uniform and general linear arrays is analytically studied and an explicit expression of a relationship between this bias and the effect of mutual coupling together with the direction of the incident source is given. The biases of different ... View full abstract»

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  • Three uncertainty relations for real signals associated with linear canonical transform

    Publication Year: 2009, Page(s):85 - 92
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (173 KB)

    Uncertainty principle plays an important role in signal processing, physics and mathematics, and it represents the relations between time spread and frequency spread (or position and velocity). Linear canonical transform (LCT) is one generalisation of Fresnel transform, fractional Fourier transform and others. The LCT has been used in physical optics and signal processing. Three novel results of u... View full abstract»

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