Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 45, Issue 13, 18 June 2009
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Volume 45, Issue 13
18 June 2009
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- Author(s): L.-N. Zhang ; S.-S. Zhong ; X.-L. Liang ; C.-Z. Du
- Source: Electronics Letters, Volume 45, Issue 13, p. 659 –660
- DOI: 10.1049/el.2009.0844
- Type: Article
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A novel ultra-wideband printed monopole antenna with a band-notch characteristic and stable omnidirectional radiation is presented. The antenna design adopts a bevelled square patch as a monopole, a double-feed technique and a microstrip feeder embedded with an inverted U-shaped slot. Good agreement between simulation and experiment shows that the proposed antenna achieves an impedance bandwidth of 3.05–5.15 and 6.02–10.84 GHz for VSWR≤2, a stable omnidirectional radiation and a low cross-polarisation level. - Author(s): A. Ellgardt
- Source: Electronics Letters, Volume 45, Issue 13, p. 660 –662
- DOI: 10.1049/el.2009.0272
- Type: Article
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Analysing infinite phased array antennas using time domain codes is favourable when looking into wideband solutions. Unfortunately, unit cell-based time domain codes using time shifts between cell boundaries have a disadvantage of only being able to analyse phase shifts corresponding to a beam scanned in the visible space. However, to fully characterise the infinite array antenna it is sometimes necessary to compute the active reflection coefficient for scan directions corresponding to invisible space. Presented is a simple new approach on how to do this. By extending the size of the computational domain, and including more than one element, phase shifts corresponding to invisible space are included. - Author(s): Q. Bai and R. Langley
- Source: Electronics Letters, Volume 45, Issue 13, p. 662 –663
- DOI: 10.1049/el.2009.0864
- Type: Article
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The performance of a dual-band textile antenna integrated with an artificial magnetic conductor under bending and crumpling conditions is presented. Both input impedance and radiation patterns are investigated based on numerical and experimental methods at 2.45 and 5.8 GHz. - Author(s): G. Ruvio ; M.J. Ammann ; X. Bao
- Source: Electronics Letters, Volume 45, Issue 13, p. 663 –664
- DOI: 10.1049/el.2009.1145
- Type: Article
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A novel radial layout for mushroom-like electromagnetic-bandgap (EBG) cells surrounding a printed circularly-polarised patch antenna is proposed. Two radial EBG configurations surrounding a circular patch are compared to a reference patch on a conventional ground plane of the same dimension. The radial shape and displacement of the EBG cells around the patch offers improvements in terms of gain and axial-ratio compared to the reference antenna and is more suitable for circular geometries compared to conventional Cartesian layouts. In particular, the distance between the patch and the surrounding EBG cells is independent of the cell period, which can be arbitrarily chosen, and the overall layout offers footprint reduction. - Author(s): I. Cuiñas ; P. Gómez ; A.V. Alejos ; M.G. Sánchez
- Source: Electronics Letters, Volume 45, Issue 13, p. 664 –666
- DOI: 10.1049/el.2009.0948
- Type: Article
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The use of rows of trees or shrubs, supported by lattice structures, as barriers to minimise electromagnetic pollution is proposed and tested by means of measurements within an anechoic chamber. The vegetation specie used was Ficus benjamina. The attenuation provided by six different supporting structures, and combined following six geometrical organisations, has been measured at GSM and UMTS bands at both horizontal and vertical polarisations. Results appear to show that the presence of the supporting lattice structure enhances the attenuation provided by the fence. Vertically polarised waves seem to suffer stronger attenuations than horizontally polarised waves. Besides, certain dependence on the lattice material and the density of the obstruction of the structure, as well as on the configuration of the barrier, have been highlighted by the measured results. - Author(s): Y.J. Sung
- Source: Electronics Letters, Volume 45, Issue 13, p. 666 –667
- DOI: 10.1049/el.2009.0504
- Type: Article
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A novel technique for designing a tunable dual-band microstrip patch antenna is proposed. Dual-band operation is easily achieved by loading a microstrip patch antenna with one varactor diode placed on a small gap between a square patch and a parasitic strip. It is observed from the measured result that the proposed antenna shows a wide tuning range at the two resonant frequencies. - Author(s): D. Kim ; J.W. Lee ; C.S. Cho ; T.K. Lee
- Source: Electronics Letters, Volume 45, Issue 13, p. 668 –669
- DOI: 10.1049/el.2009.0901
- Type: Article
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A circularly-polarised antenna which has a novel feeding structure like a substrate integrated waveguide, a cavity-backed resonator and a conventional ring-slot antenna is proposed for right-handed circular polarisation (RHCP) in a single-layered fabrication. The CP generation and broadband impedance matching characteristics are accomplished by using a simple shorting via between the top patch and bottom ground plane and inserting inductive via arrays at the input port, respectively. A broadband impedance bandwidth of 18.74% and a RHCP axial ratio of 2.3% have been obtained under the condition of less than VSWR 2:1 and axial ratio −3 dB, respectively.
Compact omnidirectional band-notch ultra-wideband antenna
Computing return loss for arbitrary scan directions using limited scan codes for infinite phased arrays
Crumpled integrated AMC antenna
Radial EBG cell layout for GPS patch antennas
Reducing electromagnetic pollution by shrub lines supported by lattice structures
Simple tunable dual-band microstrip patch antenna
X-band circular ring-slot antenna embedded in single-layered SIW for circular polarisation
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- Author(s): G. Lassere ; S. Morfu ; P. Marquié
- Source: Electronics Letters, Volume 45, Issue 13, p. 669 –670
- DOI: 10.1049/el.2009.0544
- Type: Article
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A nonlinear electronic circuit simulating the neuronal activity in a noisy environment is proposed. This electronic circuit is exactly ruled by the set of Bonhoeffer-Van Der Pol equations and is excited with a Gaussian noise. Without external deterministic stimuli, it is shown that the circuit exhibits the so-called ‘coherence resonance’ phenomenon.
Coherence resonance in Bonhoeffer-Van der Pol circuit
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- Author(s): R. Szplet
- Source: Electronics Letters, Volume 45, Issue 13, p. 671 –672
- DOI: 10.1049/el.2009.3362
- Type: Article
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A novel method for auto-tuned synchronisation of the counter in interpolation time digitisers is described. A clock phase adjustment is utilised to avoid the metastability effect in the counter and to achieve the highest possible operating frequency in a given technology. - Author(s): T. Musah and U.-K. Moon
- Source: Electronics Letters, Volume 45, Issue 13, p. 672 –674
- DOI: 10.1049/el.2009.0208
- Type: Article
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A new technique is proposed to compensate for the loop gain degradation in correlated level shifting. The technique allows the use of a simple single-stage opamp with low gain to realise high effective loop gain. The effect of gain variations on the performance of the proposed correlated level shifting technique is discussed.
Auto-tuned counter synchronisation in FPGA-based interpolation time digitisers
Correlated level shifting technique with cross-coupled gain-enhancement capacitors
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- Author(s): Y.Y. Zhang ; X.J. Wu ; Q.Q. Ruan
- Source: Electronics Letters, Volume 45, Issue 13, p. 674 –675
- DOI: 10.1049/el.2009.0972
- Type: Article
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A novel and powerful gait recognition algorithm is proposed. The method of procrustes shape analysis is used to produce procrustes mean shape (PMS) as a compressed representation of gait sequence. PMS is regarded as the gait signature for classification. Quite different and novel, instead of using the procrustes mean shape distance as a similarity measure, a novel shape descriptor, shape context, to measure the similarity between two PMSs is introduced. Experimental results show that the proposed algorithm outperforms other approaches in terms of recognition accuracy.
Combining procrustes shape analysis and shape context descriptor for silhouette-based gait recognition
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- Author(s): A. Alimohammad ; S.F. Fard ; B.F. Cockburn
- Source: Electronics Letters, Volume 45, Issue 13, p. 675 –677
- DOI: 10.1049/el.2009.0373
- Type: Article
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A new layered symbol detection algorithm for multiple-input multiple-output systems is presented. In this scheme, the layers are divided into two groups and detected differently. For the layer with the smallest post-detection signal-to-noise ratio, an exhaustive search is performed over the signal constellation; for the remaining layers the conventional iterative vertical Bell laboratories layered space–time (V-BLAST) technique is utilised. The proposed algorithm also uses a different symbol detection ordering from that recommended in the original V-BLAST algorithm. Simulation results show that the error rate performance of the proposed detection algorithm approaches closely that of an optimal maximum likelihood detector with no reduction in the symbol detection throughput, while the computational complexity is less than || times that of V-BLAST, where || is the cardinality of signal constellation .
Improved layered MIMO detection algorithm with near-optimal performance
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- Author(s): Y.S. Jang ; J.S. Lee ; S.G. Lee ; J.H. Ko
- Source: Electronics Letters, Volume 45, Issue 13, p. 677 –678
- DOI: 10.1049/el.2009.0843
- Type: Article
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A novel DC-offset cancellation circuit that is applicable to complex filters is presented. The proposed circuit allows for a high-gain complex filter, which leads to a small chip size and low current consumption. Adopting the proposed scheme, a 10 to 73 dB gain complex filter that cancels an input referred DC-offset by more than ±100 mV is designed based on 0.18 µm CMOS technology, which dissipates 2.4 mA from a 1.8 V supply. - Author(s): S.K. Yeo and Y.S. Kwon
- Source: Electronics Letters, Volume 45, Issue 13, p. 678 –680
- DOI: 10.1049/el.2009.3588
- Type: Article
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It is reported that 3-D interconnects fabricated with a selectively anodised aluminium process for a multilayer module package can be used to evaluate high-frequency performance. The proposed method of fabricating vertical interconnects is easier and more cost-effective than other RF MEMS processes. To transfer RF signals vertically, coaxial hermetic seal vias with characteristic 50 Ω impedances and embedded anodised aluminium vias with a solder ball attachment and flip-chip bonding were used. The optimised interconnect structure demonstrated RF characteristics with an insertion loss of less than 1.55 dB and a return loss of less than 12.25 dB over a broad bandwidth ranging from 0.1 to 10 GHz. Experimental results suggest that the developed technology, which is based on selectively anodised aluminium, can be applied to new 3-D packaging solutions.
Complex DC-offset cancellation circuit
Three-dimensional interconnect for multilayer module packages with selectively anodised aluminium substrate
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- Author(s): J. Cai and M. Kanskar
- Source: Electronics Letters, Volume 45, Issue 13, p. 680 –681
- DOI: 10.1049/el.2009.0920
- Type: Article
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1060 nm emitting broad-waveguide-type aluminium-free diode lasers have been optimised for maximum power conversion efficiency (PCE). PCE at 67% is achieved at continuous-wave operation and 25°C heatsink temperature from a 1 mm cavity length, 100 µm stripe diode laser. The improvement is mainly the result of an increase in injection efficiency via optimisation of the bandgap structure, and reductions in operating voltage via doping optimisation of the broad-waveguide structure. - Author(s): Y.R. Lin ; H.H. Lin ; J.H. Chu
- Source: Electronics Letters, Volume 45, Issue 13, p. 682 –683
- DOI: 10.1049/el.2009.1243
- Type: Article
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A GaAs0.7Sb0.3/GaAs type-II quantum-well laser with a InAs quantum-dot (QD) layer adjacent to the well is reported. The laser shows much lower threshold current density, lower internal loss and higher characteristic temperature than the device without adjacent QDs. The better performances are attributed to additional dimensional confinement, resulting from a spatial potential fluctuation induced by the adjacent QDs, for carriers in the active region of the laser. - Author(s): A. Mizutori ; Y. Nishizato ; K. Mori ; T. Yamamoto ; K. Suzuki ; A. Takada ; M. Koga
- Source: Electronics Letters, Volume 45, Issue 13, p. 683 –684
- DOI: 10.1049/el.2009.0910
- Type: Article
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A novel optical frequency stabilisation technique on the ITU-T frequency grid employing modulated sideband light is proposed. The L-band laser diode second sideband light generated by phase-modulation is locked to a carbon monoxide 12C16O gas absorption line; the original carrier is placed on the ITU-T frequency grid. The square root of Allan variance of 10−8 has been achieved for a period of 12 h.
67% CW power conversion efficiency from Al-free 1060 nm emitting diode lasers
GaAs0.7Sb0.3/GaAs type-II quantum-well laser with adjacent InAs quantum-dot layer
Laser diode optical frequency stabilisation technique on ITU-T frequency grid employing modulated sideband light
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- Author(s): J.-S. Syu ; C. Meng ; Y.-H. Teng
- Source: Electronics Letters, Volume 45, Issue 13, p. 685 –686
- DOI: 10.1049/el.2009.0360
- Type: Article
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A 10 GHz dual-conversion low-IF downconverter using 0.18-µm CMOS technology is demonstrated. The high-frequency quadrature RF and LO1 signals are generated by broadside-coupled quadrature couplers while a two-section polyphase filter is utilised for the low-frequency LO2 quadrature signal generation. As a result, the demonstrated downconverter achieves a conversion gain of 7 dB, IP1 dB of −16 dBm, IIP3 of −5 dBm and noise figure of 26 dB at a 1.8 V supply. The image-rejection ratio of the first/second image signal is 33/42 dB for IF frequency ranging from 10 to 60 MHz, respectively. - Author(s): F. Goelden ; A. Gaebler ; M. Goebel ; A. Manabe ; S. Mueller ; R. Jakoby
- Source: Electronics Letters, Volume 45, Issue 13, p. 686 –687
- DOI: 10.1049/el.2009.1168
- Type: Article
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A tunable phase shifter using liquid crystal (LC) is presented. The device is fabricated in a fashion similar to LC displays which makes fabrication very simple compared, for example, to MEMS approaches. At the targeted operation frequency of 20 GHz the device offers a performance of above 60° differential phase shift per dB insertion loss and a minimum tuning speed of 340 ms. - Author(s): A. Ali ; H. Aubert ; N. Fonseca ; F. Coccetti
- Source: Electronics Letters, Volume 45, Issue 13, p. 687 –689
- DOI: 10.1049/el.2009.0464
- Type: Article
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An original wideband two-layer substrate integrated waveguide directional coupler is presented. The structure provides attractive features including a flexible design with a wideband coupling and independent control of the transmission phase for arbitrary coupling levels. Characteristics of 18 dB isolation and 90° phase shift between direct and coupled ports are experimentally validated over 16% bandwidth.
10 GHz dual-conversion low-IF downconverter with microwave and analogue quadrature generators
Tunable liquid crystal phase shifter for microwave frequencies
Wideband two-layer SIW coupler: design and experiment
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- Author(s): J. Wu and A.G. Dempster
- Source: Electronics Letters, Volume 45, Issue 13, p. 689 –691
- DOI: 10.1049/el.2009.0374
- Type: Article
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The extended binary offset carrier-pseudorandom noise (BOC-PRN) discriminator is shown to work efficiently for the new cosine phased BOC (fs,fc) signals defined for global navigation satellite systems, where n (=2fs/fc) is an arbitrary even integer. The new unambiguous code discriminator provides good multipath mitigation performance for medium delays. - Author(s): N. Wu ; H. Wang ; J.-M. Kuang
- Source: Electronics Letters, Volume 45, Issue 13, p. 691 –692
- DOI: 10.1049/el.2009.0229
- Type: Article
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A code-aided iterative carrier phase estimator using selective soft decision feedback is proposed. Based on the reliability metric defined, soft decisions provided by the soft-in/soft-out channel decoder with higher reliabilities are selected to perform carrier phase estimation iteratively. Simulation results demonstrate the performance improvement of the proposed algorithm in both the unbiased estimation range and the estimation precision. The overall bit error rate performance of the coded systems with different phase estimators is also compared. - Author(s): M.-H. Jing ; Y. Chang ; Z.-H. Chen ; J.-H. Chen
- Source: Electronics Letters, Volume 45, Issue 13, p. 692 –694
- DOI: 10.1049/el.2009.1061
- Type: Article
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A novel decoding scheme, called syndrome-weight determination, was proposed by Chang et al. in 2008 for the Golay code, or the (23, 12, 7) quadratic residue code. This method is not only very simple in principle but also suitable for parallel hardware design. Presented is a modified version for any binary quadratic residue codes which has been developed. Because of its regular property, the proposed decoder is suitable for both software design and hardware development.
Applying a BOC-PRN discriminator to cosine phased BOC(fs, fc) modulation
Code-aided iterative carrier phase estimation using selective soft decision feedback
Universal decoding algorithm for binary quadratic residue codes using syndrome-weight determination
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- Author(s): C. Mélange ; B. Baekelandt ; P. Demuytere ; J. Bauwelinck ; K. Van Renterghem ; T. De Ridder ; X.Z. Qiu ; J. Vandewege
- Source: Electronics Letters, Volume 45, Issue 13, p. 694 –695
- DOI: 10.1049/el.2009.3525
- Type: Article
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A novel mixed analogue/digital design of a phase picking algorithm in an oversampling clock phase recovery is presented. The proposed approach results in reduced processing time, improved integrability with analogue front-end and low noise generation. Simulations of a 10 Gbit/s burst-mode clock phase alignment circuit in a 0.25 µm SiGe BiCMOS process, show a simulated processing delay of only 280 ps. - Author(s): E. Yamazaki ; H. Masuda ; A. Sano ; T. Yoshimatsu ; T. Kobayashi ; E. Yoshida ; Y. Miyamoto ; R. Kudo ; K. Ishihara ; M. Matsui ; Y. Takatori
- Source: Electronics Letters, Volume 45, Issue 13, p. 695 –697
- DOI: 10.1049/el.2009.0993
- Type: Article
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It is experimentally shown that employing multi-staged reverse self-phase-modulation in a coherent receiver compensates for waveform distortion due to self-phase-modulation including the inter-polarisation nonlinearity of polarisation-division multiplexing and inter-subcarrier nonlinearity of orthogonal frequency division multiplexing. This scheme extends the transmission distance 1.25-fold under an uncompensated dispersion map to suppress cross-phase-modulation, and a 10-channel ×111 Gbit/s OFDM signal is successfully transmitted 12 015 km at the spectrum efficiency of 2.0 bit/s/Hz with a 1.0 dB penalty reduction. - Author(s): L. Xu ; C. Li ; H.K. Tsang ; C.W. Chow
- Source: Electronics Letters, Volume 45, Issue 13, p. 697 –698
- DOI: 10.1049/el.2009.0314
- Type: Article
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An integrated optical millimetre-wave signal generator based on a coupled microring resonator, which doubles the frequency of the electrical signal driving a phase modulator, is proposed and experimentally demonstrated for future radio-over-fibre systems. The coupled microring notch filter was fabricated on a silicon-on-insulator wafer. A high extinction ratio optical millimetre-wave signal was obtained.
Mixed analogue/digital phase picking algorithm in oversampling burst-mode clock phase alignment
Multi-staged nonlinear compensation in coherent receiver for 12 015 km WDM transmission of 10-ch×111 Gbit/s no-guard-interval co-OFDM
Optical frequency doubling for multichannel radio-over-fibre system based on integrated phase modulator and silicon coupled microring notch filter
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- Author(s): B. Li ; D. Lu ; M.I. Memon ; G. Mezosi ; Z. Wang ; M. Sorel ; S. Yu
- Source: Electronics Letters, Volume 45, Issue 13, p. 698 –700
- DOI: 10.1049/el.2009.0845
- Type: Article
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Novel all-optical implementations for logic AND and XOR gates are experimentally demonstrated at 2.5 Gbit/s based on cavity-enhanced four-wave-mixing (CE-FWM) combined with optical injection locking phenomena in monolithically integrated semiconductor ring lasers (SRLs). An all-optical AND gate with simultaneous wavelength conversion has been achieved using CE-FWM. An XOR function is demonstrated using two parallel SRLs, each performing one part of the XOR Boolean equation A ⊕ B=AB̄+ĀB. Error-free operation with extinction ratio higher than 10 dB confirms the suitability of SRLs for all-optical logic applications. - Author(s): Q.Y. Lu ; W.H. Guo ; D. Byrne ; J.F. Donegan
- Source: Electronics Letters, Volume 45, Issue 13, p. 700 –701
- DOI: 10.1049/el.2009.3489
- Type: Article
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The compact 2D finite difference time domain method combined with the uniaxial anisotropic perfectly-matched-layer (UPML) absorption boundary condition and the Padé approximation transform has been employed in a novel method to analyse leaky modes in deep-ridge semiconductor waveguides. Compared with frequency-domain mode solvers based on complex root searching, this method is easy to implement and can calculate the mode loss and the propagation constant separately and reliably. - Author(s): A. Younus ; P. Desbarats ; S. Bosio ; E. Abraham ; J.C. Delagnes ; P. Mounaix
- Source: Electronics Letters, Volume 45, Issue 13, p. 702 –703
- DOI: 10.1049/el.2009.0688
- Type: Article
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Terahertz time-domain spectroscopy (THz-TDS) measurements have been performed to characterise a photopolymer resin (FullCure Materials®) in the 0.1–3.5 THz range. A loss tangent less than 7% has been revealed up to 1.5 THz along with a weak frequency dependence of the real part of the optical index and the dielectric permittivity. This study underlines the promising applications of such a material for the fabrication of 3D THz imaging phantoms in the 0–1.5 THz range.
All-optical digital logic AND and XOR gates using four-wave-mixing in monolithically integrated semiconductor ring lasers
Analysis of leaky modes in deep-ridge waveguides using the compact 2D FDTD method
Terahertz dielectric characterisation of photopolymer resin used for fabrication of 3D THz imaging phantoms
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- Author(s): J.S. Yun ; J.I. Shim ; D.S. Shin
- Source: Electronics Letters, Volume 45, Issue 13, p. 703 –705
- DOI: 10.1049/el.2009.0803
- Type: Article
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An electrode pattern design methodology that improves the current uniformity in mesa-structured GaN/InGaN blue light-emitting diodes (LEDs) is investigated. Comparisons between an LED with a new electrode pattern adopting the proposed methodology and an LED with a commercially used electrode are made in view of both current and luminance distributions. Simulations as well as experimental results show that the proposed simple design methodology is very effective to spread current more uniformly in the active layer. - Author(s): A. Marchlewski ; H. Zimmermann ; I. Jonak-Auer ; G. Meinhardt ; E. Wachmann
- Source: Electronics Letters, Volume 45, Issue 13, p. 705 –706
- DOI: 10.1049/el.2009.0738
- Type: Article
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Universal pin photodiodes combine low capacitance with high bandwidth and high responsivity. A speed improvement is achieved for a pin finger photodiode in a high-speed 0.35 µm SiGe heterojunction bipolar transistor (HBT) BiCMOS technology. The cathode finger structure results in a high responsivity of 0.2 A/W (quantum efficiency 61%) for 410 nm light and a bandwidth of 1253 MHz at a reverse bias voltage of 3 V. Owing to the thick low doped intrinsic epitaxial layer, high bandwidths and high dynamic quantum efficiencies result for a wide spectrum of optical wavelengths from ultraviolet and blue to red and near-infrared. - Author(s): L. Tang ; S. Latif ; D.A.B. Miller
- Source: Electronics Letters, Volume 45, Issue 13, p. 706 –708
- DOI: 10.1049/el.2009.0839
- Type: Article
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The first plasmonic device integrated in Si CMOS, a C-shaped nanoaperture photodetector with a small feature size of 40 nm is presented. The photocurrent polarisation dependence of the C aperture detector is direct evidence of an antenna effect in the blue wavelength range. In contrast, there is no evident polarisation dependence for the square aperture detector with the same physical area. The photocurrent density of a CMOS detector is enhanced three times with the C-shaped nanoaperture.
Enhancing current spreading by simple electrode pattern design methodology in lateral GaN/InGaN LEDs
Improvement of universal pin photodetectors in 0.35 µm SiGe BiCMOS technology
Plasmonic device in silicon CMOS
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- Author(s): Y. Zhu ; H. Zhao ; J. Zhou ; Q. Fu
- Source: Electronics Letters, Volume 45, Issue 13, p. 708 –709
- DOI: 10.1049/el.2009.0502
- Type: Article
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During bandwidth synthesis in stepped-frequency radar, amplitude and phase discontinuity between neighbouring pulses should be corrected by a filter. Usually, this filter is constructed by measured data from a calibrator. However, this may be infeasible in non-cooperative situations. Using the signal characteristics after IDFT across received pulses, an improved bandwidth synthesis method based on scatterer alignment is proposed, which neither requires calibration, nor has the serious deficits of the classical IDFT method, such as a limited unambiguous range-profiling window. Analysis of real data collected by a Ka-band radar has verified its advantages.
Improved bandwidth-synthesis method of stepped-frequency radar for non-cooperative targets
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- Author(s): I. Lee ; G.-J. Jang ; T.-W. Lee
- Source: Electronics Letters, Volume 45, Issue 13, p. 710 –711
- DOI: 10.1049/el.2009.0945
- Type: Article
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Independent vector analysis (IVA), a multivariate extension of independent component analysis, tackles the convolutedly mixed blind source separation (BSS) problem in a way to avoid the permutation problem by employing a multivariate source prior of the short-time Fourier transform (STFT) components. As the source prior in IVA, overall hyperspherical joint densities have been used, which imply that the dependence between the STFT components is invariant over bin difference. As a more effective source prior in the IVA framework, a dependence model is proposed that can be represented by chain-like overlaps of local cliques in graphical models. For convolutive BSS, the proposed method demonstrates consistently improved performance over using the overall hyperspherical joint density representation.
Independent vector analysis using densities represented by chain-like overlapped cliques in graphical models for separation of convolutedly mixed signals
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