Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 37, Issue 9, 26 April 2001
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Volume 37, Issue 9
26 April 2001
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- Author(s): J.S. Baligar ; U.K. Revankar ; K.V. Acharya
- Source: Electronics Letters, Volume 37, Issue 9, p. 547 –548
- DOI: 10.1049/el:20010371
- Type: Article
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The design and experimental results of a new configuration two-layer shorted square microstrip antenna with low cross-polarisation are described. The antenna has a bandwidth of 11% centred around 1.975 GHz with a gain of 8.6 dB, and exhibits better than –13 dB cross-polarisation levels in the H-plane. The computed and measured results of the co-planar configuration of the structure are compared with its new two-layer stacked configuration. - Author(s): K. Kang ; W.X. Zhang ; J.J. Li
- Source: Electronics Letters, Volume 37, Issue 9, p. 548 –549
- DOI: 10.1049/el:20010315
- Type: Article
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A planar coupled tapered slot-line antenna with sum/difference beams is developed based on fast MoM procedures and optimisation using specific genetic algorithm operators. The aim of the optimisation procedure is to realise a balanced combination of the gain of the sum-beam and the slope of the difference-beam. A test sample provides the desired performances.
Broadband two-layer shorted patch antenna with low cross-polarisation
Optimisation of coupled tapered slot-line antenna for sum/difference beams
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- Author(s): A. Tamaševičius ; G. Mykolaitis ; S. Bumelienė ; A. Čenys ; A.N. Anagnostopoulos ; E. Lindberg
- Source: Electronics Letters, Volume 37, Issue 9, p. 549 –551
- DOI: 10.1049/el:20010398
- Type: Article
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A novel version of the chaotic Colpitts oscillator is proposed. It contains two bipolar junction transistors coupled in series. The resonance loop consists of an inductor and three capacitors. The two-stage oscillator, compared with the classical circuit, enables the fundamental frequency of chaotic oscillations to be increased by a factor of three. The PSpice simulations performed with 9 GHz threshold frequency transistors demonstrate that the highest fundamental frequencies of chaotic behaviour are 1 and 3 GHz for the classical and the two-stage Colpitts oscillator, respectively.
Two-stage chaotic Colpitts oscillator
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- Author(s): L. Imbert and G.A. Jullien
- Source: Electronics Letters, Volume 37, Issue 9, p. 551 –552
- DOI: 10.1049/el:20010378
- Type: Article
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A new technique for applying fault tolerance to modulus replication RNS computations by adding redundancy to the independent computational channels is introduced. This technique provides a low-overhead solution to fault tolerant large inner product computations. - Author(s): G. Manganaro
- Source: Electronics Letters, Volume 37, Issue 9, p. 552 –554
- DOI: 10.1049/el:20010384
- Type: Article
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A simple yet effective approach to the generation of switch control signals to reduce timing-skew problems in interleaved and double-sampled switch-capacitor circuits is proposed. No additional switches are required and only a minor increase in complexity is needed to generate the clock phase. - Author(s): Changwoo Jung and Jihong Kim
- Source: Electronics Letters, Volume 37, Issue 9, p. 554 –555
- DOI: 10.1049/el:20010380
- Type: Article
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A low-power I-cache architecture is proposed that is appropriate for embedded low-power processors. Unlike existing schemes, the proposed organisation places an extra small cache in parallel alongside the L1 cache. Since it allows simultaneous accesses to both caches, the proposed scheme introduces little performance degradation. Using simple hardware logic (for sequential accesses) and a compiler transformation (for loop accesses), most L1 cache requests are served by a small cache, so that the amount of energy consumed by the L1 cache is significantly reduced. Experimental results show that for the SPEC95 benchmarks, the proposed organisation reduces the energy-delay product on average by 67.2% over a conventional cache design and 16.8% over the filter cache design. - Author(s): J. Juan-Chico ; M.J. Bellido ; P. Ruiz-de-Clavijo ; C. Baena ; C.J. Jiménez ; M. Valencia
- Source: Electronics Letters, Volume 37, Issue 9, p. 555 –557
- DOI: 10.1049/el:20010389
- Type: Article
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The degradation delay model is applied to accurately estimate the switching activity in CMOS digital circuits. The model overcomes the limitations of conventional gate-level logic simulators to handle the propagation of glitches, a main source of switching activity. Model results of a four-bit multiplier are within 4% with respect to HSPICE, while Verilog overestimations are up to 68%.
Fault tolerant computation of large inner products
Feed-forward approach for timing skew in interleaved and double-sampled circuits
Instruction cache organisation for embedded low-power processors
Switching activity evaluation of CMOS digital circuits using logic timing simulation
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- Author(s): E. Martini and S. Selleri
- Source: Electronics Letters, Volume 37, Issue 9, p. 557 –558
- DOI: 10.1049/el:20010397
- Type: Article
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An innovative class of curvilinear tetrahedral elements, based on rational Bézier volumes, is presented. The accuracy and effectiveness of this approach are investigated in a finite element framework and compared with those achieved with straight and conventional curvilinear elements.
Innovative class of curvilinear tetrahedral elements
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- Author(s): L. Provino ; J.M. Dudley ; H. Maillotte ; N. Grossard ; R.S. Windeler ; B.J. Eggleton
- Source: Electronics Letters, Volume 37, Issue 9, p. 558 –560
- DOI: 10.1049/el:20010395
- Type: Article
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A 300 nm broadband visible continuum has been generated in a 1.8 m length of microstructured fibre pumped at 532 nm by 0.8 ns pulses from a frequency-doubled passively Q-switched Nd:YAG microchip laser. With nanosecond pulses, self-phase-modulation is negligible, and the continuum generation is dominated by the interplay of Raman and parametric effects. - Author(s): K. Furusawa ; T.M. Monro ; P. Petropoulos ; D.J. Richardson
- Source: Electronics Letters, Volume 37, Issue 9, p. 560 –561
- DOI: 10.1049/el:20010402
- Type: Article
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The authors report the fabrication of a polarisation-maintaining, high-nonlinearity, anomalously dispersive, Yb3+ doped holey fibre and describe what they believe to be the first demonstration of a modelocked holey fibre laser.
Compact broadband continuum source based on microchip laser pumped microstructured fibre
Modelocked laser based on ytterbium doped holey fibre
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- Author(s): Mingyou Hu and Boon Tiong Tan
- Source: Electronics Letters, Volume 37, Issue 9, p. 561 –563
- DOI: 10.1049/el:20010372
- Type: Article
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A progressive image-coding algorithm that uses a combination of the set partitioning in hierarchical tree (SPIHT) algorithm and an embedded trellis-coded quantiser (E-TCQ) is proposed. Using the hierarchical quadtree structure, a significant map of coefficients is encoded. The E-TCQ is then used to refine the amplitude of the significant pixels. Results are obtained using the proposed method. It is shown that this method gives good performance, with very little increase in computational complexity and storage memory. - Author(s): N. Gregory ; A.R. Davies ; M. Darnell ; S. Boussakta
- Source: Electronics Letters, Volume 37, Issue 9, p. 563 –564
- DOI: 10.1049/el:20010410
- Type: Article
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A new video compression algorithm based on a temporal blocking structure, rather than the more conventional spatial blocking structure, is described. This blocking structure forms the basis of an adaptive vector quantisation (VQ) algorithm, the performance of which is then compared with a similar adaptive VQ scheme based on a spatial blocking structure.
Progressive image coding using set partitioning in hierarchical tree algorithm and embedded trellis-coded quantiser
Video compression employing algorithm using temporal blocking structures
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- Author(s): Y. Ma ; S.H. Chang ; S.S. Chang ; S.T. Ho
- Source: Electronics Letters, Volume 37, Issue 9, p. 564 –565
- DOI: 10.1049/el:20010374
- Type: Article
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Cascaded InGaAsP/InP microdisk resonators as optical filters are fabricated by deep dry-etching. Compared with single microdisk resonators, these higher-order filters show steeper rolloffs and flatter passbands. The bandwidth ratios of 15 to 3 dB for the single, three and five cascaded microdisk resonator filters are ~2.4, 1.4 and 1.2.
Improved optical filter responses in cascaded InGaAsP/InP microdisk resonators
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- Author(s): T. Anan ; M. Yamada ; K. Nishi ; K. Kurihara ; K. Tokutome ; A. Kamei ; S. Sugou
- Source: Electronics Letters, Volume 37, Issue 9, p. 566 –567
- DOI: 10.1049/el:20010405
- Type: Article
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1.30 µm VCSELs using GaAsSb quantum wells, which operate continuous-wave at and above room temperature (RT), are reported. A threshold current as low as 1.2 mA at RT and a maximum CW operating temperature of 70°C are demonstrated. - Author(s): Y.K. Sin ; Y. Qiu ; R.E. Muller ; S. Forouhar
- Source: Electronics Letters, Volume 37, Issue 9, p. 567 –569
- DOI: 10.1049/el:20010375
- Type: Article
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Data is presented on stable, tunable singlemode operation from laterally coupled InGaAsP/InP ridge waveguide distributed feedback lasers at ~1.5 µm, suitable for chemical sensing, realised by a greatly simplified fabrication process requiring a single MOCVD growth step. Completed lasers show sidemode suppression ratios as high as 47 dB and wavelength shifts with injection current of 0.035 nm/mA (or 4.5 GHz/mA). - Author(s): Y. Hong ; P.S. Spencer ; K.A. Shore
- Source: Electronics Letters, Volume 37, Issue 9, p. 569 –570
- DOI: 10.1049/el:20010386
- Type: Article
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Optical bistability in an injection-locked vertical cavity surface-emitting semiconductor laser subject to parallel optical injection has been observed. It is shown that the width of the bistability loop may be enhanced by increasing the injection power and the frequency detuning. - Author(s): H.J. Unold ; M. Golling ; F. Mederer ; R. Michalzik ; D. Supper ; K.J. Ebeling
- Source: Electronics Letters, Volume 37, Issue 9, p. 570 –572
- DOI: 10.1049/el:20010407
- Type: Article
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Completely singlemode MBE-grown selectively oxidised InGaAs-VCSELs with aperture diameters of up to 14 µm have been fabricated using a self-aligned shallow surface etch. By choosing the growth position accordingly, a continuous variation of the aperture diameter across the wafer is achieved to optimise the surface etch to aperture diameter ratio. A record singlemode output power of 5.7 mW (30 dB SMSR) is obtained for a 5.8 µm-aperture diameter, 2.8 µm etch spot diameter device.
Continuous-wave operation of 1.30 µm GaAsSb/GaAs VCSELs
Laterally coupled InGaAsP/InP distributed feedback lasers at 1.5 µm for chemical sensing applications
Power and frequency dependence of hysteresis in optically bistable injection-locked VCSELs
Singlemode output power enhancement of InGaAs VCSELs by reduced spatial hole burning via surface etching
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- Author(s): A. Griol ; J. Marti ; L. Sempere
- Source: Electronics Letters, Volume 37, Issue 9, p. 572 –573
- DOI: 10.1049/el:20010376
- Type: Article
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Bandpass filters based on microstrip coupled ring resonators including spur-line filters to suppress higher harmonics have been investigated. Two topologies based on placing spur-line filters into or out of the coupled rings have been considered and compared. A harmonic suppression ratio > 30 dB in a flat bandpass filter centred at 2.44 GHz is obtained placing spur-line filters into and out of the microstrip coupled rings.
Microstrip multistage coupled ring bandpass filters using spur-line filters for harmonic suppression
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- Author(s): Ruey-Yi Wei
- Source: Electronics Letters, Volume 37, Issue 9, p. 573 –575
- DOI: 10.1049/el:20010401
- Type: Article
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A decision feedback differential detection (DFDD) scheme for differentially encoded 16-APSK signals is modified using knowledge of the signal power. Using such information can improve the error performance. It is shown that this DFDD scheme is almost identical to a previously proposed DFDD scheme in terms of the error performance.
Decision feedback differential detection for 16 DAPSK using knowledge of signal power
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- Author(s): Qiang Zhang ; Runnian Ma ; Jin Xu
- Source: Electronics Letters, Volume 37, Issue 9, p. 575 –576
- DOI: 10.1049/el:20010411
- Type: Article
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The problem of stability for cellular neural networks with delay (DCNNs) is studied. A new sufficient condition related to the global asymptotic stability for DCNNs is derived. This condition is less restrictive than that given in the literature.
Stability of cellular neural networks with delay
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- Author(s): Y. Hida ; Y. Hibino ; T. Kitoh ; Y. Inoue ; M. Itoh ; T. Shibata ; A. Sugita ; A. Himeno
- Source: Electronics Letters, Volume 37, Issue 9, p. 576 –577
- DOI: 10.1049/el:20010388
- Type: Article
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A large-scale arrayed-waveguide grating with a 400-channel and 25 GHz spacing using 1.5%-Δ silica-based waveguides on a 6-inch Si wafer has been realised. Good demultiplexing properties have been obtained over the full C- and L-band range with an on-chip loss of 3.8 to 6.4 dB and a far-end crosstalk of –30 dB. - Author(s): J. Yu ; P. Jeppesen ; S.N. Knudsen
- Source: Electronics Letters, Volume 37, Issue 9, p. 577 –579
- DOI: 10.1049/el:20010383
- Type: Article
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80 Gbit/s pulsewidth-maintained wavelength conversion based on a high-nonlinearity DSF-NOLM is realised and penalty-free transmission over 80 km conventional singlemode fibre and 12 km dispersion compensating fibre of the converted signal is demonstrated for the first time. - Author(s): N. Keil ; H.H. Yao ; C. Zawadzki ; J. Bauer ; M. Bauer ; C. Dreyer ; J. Schneider
- Source: Electronics Letters, Volume 37, Issue 9, p. 579 –580
- DOI: 10.1049/el:20010406
- Type: Article
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An athermal arrayed-waveguide grating (AWG) multiplexer relying on an all-polymer approach is reported. The all-polymer AWG consisting of polymer waveguides fabricated on a polymer substrate exhibits excellent performance. By properly adjusting the coefficient of thermal expansion of the polymer substrate, athermal and polarisation-independent AWG devices featuring a wavelength shift of less than ±0.05 nm in the 25-65°C temperature range could be demonstrated. - Author(s): Yang Jing Wen ; D. Novak ; Hai Feng Liu ; A. Nirmalathas
- Source: Electronics Letters, Volume 37, Issue 9, p. 581 –582
- DOI: 10.1049/el:20010391
- Type: Article
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140 GHz optical pulses with a pulsewidth of 2.7 ps are generated from a standard Fabry-Perot semiconductor laser using subharmonic optical injection. A new technique based on optical feed forward modulation is also presented to suppress the amplitude modulation associated with subharmonic injection. - Author(s): P.J. Winzer
- Source: Electronics Letters, Volume 37, Issue 9, page: 582 –582
- DOI: 10.1049/el:20010379
- Type: Article
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- Author(s): Kyung Hee Seo and Jae Seung Lee
- Source: Electronics Letters, Volume 37, Issue 9, p. 582 –584
- DOI: 10.1049/el:20010387
- Type: Article
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A split-function method to increase the calculation speed in the analysis of nonlinear optical fibre transmissions is presented. The solution is expressed as a product of two functions at each step. This method provides higher-order numerical solutions and error monitoring capabilities that are not available in the conventional split-step method. - Author(s): J. Hansryd and P.A. Andrekson
- Source: Electronics Letters, Volume 37, Issue 9, p. 584 –585
- DOI: 10.1049/el:20010400
- Type: Article
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A simple, wavelength tunable 40 GHz RZ source based on a fibre optical parametric amplifier is demonstrated. By using a 40 GHz sinusoidally intensity modulated pump, stable, nearly chirp free, high-power, 2–4 picosecond-wide pulses are obtained over 37 nm, extended into the L-band.
400-channel arrayed-waveguide grating with 25 GHz spacing using 1.5%-Δ waveguides on 6-inch Si wafer
80 Gbit/s pulsewidth-maintained wavelength conversion based on HNL DSF-NOLM including transmission over 80 km of conventional SMF
Athermal all-polymer arrayed-waveguide grating multiplexer
Generation of 140 GHz optical pulses with suppressed amplitude modulation by subharmonic synchronous modelocking of Fabry-Perot semiconductor laser
Comment: Optically preamplified receiver with low quantum limit
Split-function method for analysis of nonlinear optical fibre transmissions
Wavelength tunable 40 GHz pulse source based on fibre optical parametric amplifier
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- Author(s): A.J. Boyland ; G.W. Ross ; S. Mailis ; P.G.R. Smith ; R.W. Eason
- Source: Electronics Letters, Volume 37, Issue 9, p. 585 –587
- DOI: 10.1049/el:20010404
- Type: Article
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The authors demonstrate a novel electro-optically addressable switch that uses electric-field controllable total internal reflection at an interface between two anti-parallel domains fabricated in single crystal LiNbO3. With an applied field, the induced index change at the interface is sufficient to switch the beam from transmission to reflection with a contrast ratio exceeding 20 dB in current samples. - Author(s): M.-S. Yang ; Y.O. Noh ; Y.H. Won ; W.-Y. Hwang
- Source: Electronics Letters, Volume 37, Issue 9, p. 587 –588
- DOI: 10.1049/el:20010394
- Type: Article
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A novel digital thermo-optic switch based on a polymer waveguide has been demonstrated. The proposed switch consists of a conventional 1×2 digital optical switch and compact variable optical attenuators, with both elements integrated in series. The switches exhibit very low crosstalk values of –42 and –40 dB, and the switching power is ~170 mW at 1.55 µm.
Total internal reflection switching in electro-optically addressable domain-engineered LiNbO3
Very low crosstalk 1×2 digital optical switch integrated with variable optical attenuators
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- Author(s): Y.-H. You ; C.-H. Park ; M.-C. Ju ; J.-H. Paik ; K.-W. Kwon ; J.-W. Cho
- Source: Electronics Letters, Volume 37, Issue 9, p. 588 –590
- DOI: 10.1049/el:20010381
- Type: Article
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A channel estimation technique with interference cancellation in a wireless personal area network system with complementary code keying signalling is described. The performance of the proposed coherent detector is compared with that of a non-coherent detector, and a significant performance improvement as a result of the self-interference cancellation feature is observed. - Author(s): M. Poza ; A. Heras ; J. Lablanca ; E. López
- Source: Electronics Letters, Volume 37, Issue 9, p. 590 –591
- DOI: 10.1049/el:20010393
- Type: Article
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A simple method for downlink interference estimation in UMTS is presented. Unlike other preceding models, the proposed method provides an analytical solution. - Author(s): N. Amitay ; M.J. Gans ; H. Xu ; R.A. Valenzuela
- Source: Electronics Letters, Volume 37, Issue 9, p. 591 –592
- DOI: 10.1049/el:20010321
- Type: Article
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There are ever increasing demands, in wireless communications, for additional capacity to handle voice, data and wideband Internet applications. These demands are constrained by the bandwidth that was allocated to wireless communications and practical limits on maximum power and minimum cell size. The spectral efficiencies in present day wireless systems hover around 1 bit/s/Hz. BLAST (Bell-labs LAyered Space-Time) is a communication technique for achieving very high spectral efficiencies in highly scattering environments using multiple transmit and receive antennas. A measurement campaign was undertaken to assess the BLAST gains in spectral efficiency in various environments. The measurements were to be performed over a narrow band at 2.44 GHz with five transmitting and seven receiving antennas, respectively. The effects of thermal noise on the accuracy of measured BLAST capacities are investigated. - Author(s): N.H. Chow ; T.G. Jeans ; R. Tafazolli
- Source: Electronics Letters, Volume 37, Issue 9, p. 593 –594
- DOI: 10.1049/el:20010382
- Type: Article
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EDGE uses the 8PSK modulation scheme. It is difficult to employ optimum equalisation due to the high computation complexity required. Consequently, a sub-optimum technique offering an approximation to maximum likelihood sequence estimation performance is required. A simple, reduced complexity fractional spaced equaliser structure involving the delayed decision feedback sequence estimation is therefore presented. The fractional spaced approach does not require additional pre-processing creating a minimum phase overall channel impulse. It is suitable for unknown channels and has near optimum performance. - Author(s): L. Larger ; J.-P. Goedgebuer ; V.S. Udaltsov ; W.T. Rhodes
- Source: Electronics Letters, Volume 37, Issue 9, p. 594 –595
- DOI: 10.1049/el:20010396
- Type: Article
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A transmission system for secure radio-communication is proposed. It is based on a delayed nonlinear electronic oscillator, which produces directly an FM-chaotic carrier for information masking. Experimental encryption/decryption results are presented.
Channel estimation method with interference reduction for high-rate personal area networks
Downlink interference estimation in UMTS
Effects of thermal noise on accuracy of measured BLAST capacities
Practical reduced-complexity equaliser for EDGE
Radio transmission system using FM high dimensional chaotic oscillator
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- Author(s): T.S. Lay ; W.D. Liu ; M. Hong ; J. Kwo ; J.P. Mannaerts
- Source: Electronics Letters, Volume 37, Issue 9, p. 595 –597
- DOI: 10.1049/el:20010403
- Type: Article
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A MOS capacitor formed by electron-beam deposition of Ga2O3(Gd2O3) on GaN has been characterised by C-V and G-V measurements at high AC frequencies of 1000, 100 and 10 KHz. An accurate C-V relation has been obtained consistently by using a model that includes both series and shunt parasitic resistances. The results indicate a fixed oxide charge density of ~3.0 × 1011 cm-2, and a minimum interface state density of ~4.2 × 1011 cm-2 eV-1 at the Ga2O3(Gd2O3)/GaN interface. - Author(s): H.C. Chiu ; S.C. Yang ; F.T. Chien ; Y.J. Chan
- Source: Electronics Letters, Volume 37, Issue 9, p. 597 –598
- DOI: 10.1049/el:20010399
- Type: Article
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High power density Al0.3Ga0.7As/In0.15Ga0.85As doped-channel FETs (modified DCFETs) biased at 3 V for 2.4 GHz wireless communication applications are proposed. A planar Si δ-doped layer is inserted inside the wide-bandgap undoped AlGaAs layer to reduce parasitic resistances and enhance the device microwave power performance. The modified DCFETs (M-DCFETs) exhibit an output power density of 302 mW/mm, a power-added efficiency of 52%, and a linear power gain of 19 dB under 2.4 GHz operation for a 1 mm gate-width device. These characteristics suggest that doped-channel FETs with a planar Si δ-doped layer can be used in high linearity and high power microwave device applications.
C-V and G-V characterisation of Ga2O3(Gd2O3)/GaN capacitor with low interface state density
High power density of AlGaAs/InGaAs doped-channel FETs with low DC power supply
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- Author(s): F. Chapeau-Blondeau and A. Monir
- Source: Electronics Letters, Volume 37, Issue 9, p. 599 –600
- DOI: 10.1049/el:20010385
- Type: Article
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The authors propose a model in the form of a first-order recurrence which is capable of generating, over potentially unlimited ranges, long-range correlations of power-law decay with a controllable exponent. - Author(s): H.C. Card
- Source: Electronics Letters, Volume 37, Issue 9, p. 600 –601
- DOI: 10.1049/el:20010377
- Type: Article
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The relative precision in estimating average pulse rates using stochastic temporal and rate codes is compared. In most situations, temporal codes exhibit less uncertainty than rate codes at low Bernoulli probabilities and vice versa. The balance is also affected by asymmetric 0 → 1 and 1 → 0 bit error probabilities.
Generation of signals with long-range correlations
Stochastic rate and temporal codes with asymmetric bit errors
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- Author(s): Wen-June Wang and Leh Luoh
- Source: Electronics Letters, Volume 37, Issue 9, p. 601 –603
- DOI: 10.1049/el:20010412
- Type: Article
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In stabilising fuzzy systems, designers frequently suffer from the existence of the common P. An additional controller is introduced into each local fuzzy control such that the common P does not need to satisfy all Lyapunov equations. A practical system is given to illustrate its usefulness. - Author(s): V.J. Lappas ; W.H. Steyn ; C.I. Underwood
- Source: Electronics Letters, Volume 37, Issue 9, p. 603 –604
- DOI: 10.1049/el:20010408
- Type: Article
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p.
603
–604
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The gimbal angles of a CMG system can deviate from their nominal values due to external disturbances. This causes control constraints during attitude manoeuvres and increases the risk of encountering singularities. The authors present a new method to compensate for this gimbal angle offset using a magnetic control law.
Alternative stabilisation design for fuzzy systems
Control moment gyro (CMG) gimbal angle compensation using magnetic control during external disturbances
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- Author(s): A. Ariza ; E. Casilari ; F. Sandoval
- Source: Electronics Letters, Volume 37, Issue 9, p. 604 –606
- DOI: 10.1049/el:20010373
- Type: Article
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604
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A crucial parameter in the design of QoS (quality of service) routers is the periodicity with which the nodes have to broadcast messages about possible changes in the bandwidth availability of the links. A simple method for the adaptive control of this broadcast process in QoS routers is presented. In particular, the method modifies the triggering condition of the update process with the aim of stabilising the overload provoked by the update messages. The benefits of the method are shown in a realistic network in terms of bandwidth loss probability and update rate. - Author(s): C. Langlais and M. Hélard
- Source: Electronics Letters, Volume 37, Issue 9, p. 606 –607
- DOI: 10.1049/el:20010392
- Type: Article
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Turbo codes can be used to increase the performance of digital communication systems to approach the Shannon limit: with perfect synchronisation, a BER of 10-4 below Eb/N0 = 2 dB can be obtained. The authors demonstrate how to use tentative decisions to perform carrier phase recovery when using convolutional turbo codes over a satellite channel at low SNR where classical systems fail.
QoS routing with adaptive updating of link states
Using tentative decisions for carrier phase recovery of turbo-coded transmissions
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