PERFORMANCE OF CACHING ALGORITHMS FOR IPTV ON-DEMAND SERVICES

  • De Vleeschauwer D.
  • Laevens K.

Due to its native return channel and its ability to easily address each user individually an IPTV system is very well suited to offer on-demand services. Those services are becoming more popular as there is an undeniable trend that users want to watch the offered content when and where it ...

STATISTICAL MULTIPLEXING OF VIDEO PROGRAMS

  • Changuel N.
  • Sayadi B.

In this work, we propose new R-D models for the SM system using H.264/AVC video encoders. These models take into account the interframe dependencies used for performing motion compensation between a reference and a predicted frame, even I and P frames or P and P frames. In this article, the ...

NETWORK COORDINATED BEAMFORMING FOR CELL-BOUNDARY USERS: LINEAR AND NONLINEAR APPROACHES

  • Chan-Byoung C
  • Heath R.W
  • Sang-Hyun K

In this paper, low-complexity linear and nonlinear network coordinated beamforming (N-CBF) algorithms are proposed for the multi-cell downlink channel. We consider a downlink scenario with three base stations (BSs) equipped with one transmit antenna each and three mobile users, each of which has more than one receive antenna and is ...

A 1-GSAMPLE/S, 15-GHZ INPUT BANDWIDTH MASTER–SLAVE TRACK-AND-HOLD AMPLIFIER IN INP DHBT TECHNOLOGY

  • Bouvier Y.
  • Godin J.
  • Konczykowska A.
  • Ouslimani A.

A fully differential master-slave track-and-hold amplifier is designed and fabricated in a 210-GHz-f T InP DHBT process. Input bandwidth of 15 GHz, total harmonic distortion lower than -39 dB and a third harmonic rejection greater than 45 dB are measured for 1 GSample/s and 4 dBm single-ended input signal. Time ...

SUM DISCRETE-RATE MAXIMIZATION WITH RATE AND POWER CONTROL IN LAYERED SPACE-TIME CODING

  • Berthet A-O
  • Layec P
  • Visoz R.

This paper generalizes the information-theoretic optimality of minimum mean square error successive interference cancellation in layered space-time coding with rate and power control. Based on this derivation, a new concept relying on partial feedback is introduced, whose core idea is to exploit an additional degree of freedom relative to the ...

SEPARATE ERROR-FREE TRANSMISSION OF EIGHT CHANNELS AT 10 GB/S USING COMB GENERATION IN A QUANTUM-DASH-BASED MODE-LOCKED LASER

  • Akrout A.
  • Brenot R.
  • Guang Hua D
  • Le Gouezigou O.
  • Lelarge F.
  • Pommereau F.
  • Ramdane A.
  • Shen A.
  • Van Dijk F.

We report on comb generation at 1.55 mum using a mode-locked quantum-dash-based laser. A flat optical spectrum with a ~10-nm width consisting of eight 100-GHz-spaced channels is demonstrated. Separate error-free transmission of each channel is achieved at 10 Gb/s over 50-km-long single-mode fiber. Compared to an ideal external cavity continuous-wave ...

STUDY OF THE NOISE-REDUCTION PROBLEM IN THE KARHUNEN–LOÈVE EXPANSION DOMAIN

  • Benesty J.
  • Jingdong C
  • Yiteng H

Noise reduction, which aims at estimating a clean speech from a noisy observation, has long been an active research area. The standard approach to this problem is to obtain the clean speech estimate by linearly filtering the noisy signal. The core issue, then, becomes how to design an optimal linear ...

WAVELENGTH CONVERSION USING SEMICONDUCTOR OPTICAL AMPLIFIERS IN DIFFERENTIAL MACH-ZEHNDER INTERFEROMETER WITH TUNABLE INPUT COUPLER

  • Bernasconi P.
  • Bhardwaj A.
  • Buhl L.
  • Legrange J.
  • Neilson D.
  • Sauer N.
  • Simsarian J.
  • Zhang L.

A monolithically-integrated wavelength converter on an InP platform with a semiconductor optical amplifier in each arm of a differential Mach-Zehnder interferometer is presented. The data input has a tunable coupler that adjusts the splitting ratio of the optical power sent to each arm. Wavelength conversion at 40 Gbit/s is demonstrated ...

IMPROVED OFDMA UPLINK TRANSMISSION VIA COOPERATIVE RELAYING IN THE PRESENCE OF FREQUENCY OFFSETS—PART II: OUTAGE INFORMATION RATE ANALYSIS

  • Zhongshan Z

n Part I of this paper, the ergodic information rate is derived for an orthogonal frequency-division multiplexing access (OFDMA) uplink with cooperative relaying in the presence of frequency offsets. In this part, the outage information rate of the system is analysed. Both amplify-and-forward (AF) and decode-and-forward (DF) relays are considered. ...

LP MOCVD GROWTH OF INALN/GAN HEMT HETEROSTRUCTURE: COMPARISON OF SAPPHIRE, BULK SIC AND COMPOSITE SICOPSIC SUBSTRATES FOR HEMT DEVICE APPLICATIONS

  • Chartier E.
  • Delage S.
  • Di Forte Poisson M.
  • Di Persio J.
  • Magis M.
  • Morvan E.
  • Oualli M.
  • Sarazin N.
  • Tordjman M.

In this paper we report on low-pressure metalorganic vapour deposition of InAlN/GaN heterostructures grown on different substrates (Sapphire, bulk SiC, composite SiCopSiC) for HEMT applications, and on first device performances obtained with these heterostructures. Optimisation of the crystal growth on each kind of substrate has led to InAlN/GaN HEMT heterostructures ...

EXPERIMENTAL EVALUATION OF THE DIVERSITY PERFORMANCE FOR A DVB-SH MOBILE TERMINAL

  • Dussauby E
  • Duval R

This article presents measurements performed with test infrastructures for digital TV broadcasting (DVB-SH standard).The objective is to determine the diversity performance of a mobile terminal integrating two orthogonally polarized antennas in various sites. The performance evaluation is based on a narrow band analysis of the propagation channel.

180-GHZ GAIN-BANDWIDTH PRODUCT BACK-SIDE-ILLUMINATED GAINAS–ALINAS APDS

  • Achouche M.
  • Carpentier D.
  • Decobert J.
  • Lagay N.
  • Pommereau F.
  • Rouvie A.

This letter presents a comparative study of GaInAs-AlInAs avalanche photodiodes with different absorption layer thicknesses. Simulations concerning dark current and frequency response have been carried out to study the influence of the vertical structure on functional characteristics. Fabricated devices achieved gain-bandwidth product GtimesB as high as 180 GHz combined with ...

CELL BREATHING TECHNIQUES FOR LOAD BALANCING IN WIRELESS LANS

  • Bejerano Y.
  • Seung-Jae H

Maximizing network throughput while providing fairness is one of the key challenges in wireless LANs (WLANs). This goal is typically achieved when the load of access points (APs) is balanced. Recent studies on operational WLANs, however, have shown that AP load is often substantially uneven. To alleviate such imbalance of ...

ROBUST MAC-LITE AND SOFT HEADER RECOVERY FOR PACKETIZED MULTIMEDIA TRANSMISSION

  • Leprovost Y.

This paper presents an enhanced permeable layer mechanism useful for highly robust packetized multimedia transmission. Packet header recovery at various protocol layers using MAP estimation is the cornerstone of the proposed solution. The inherently available intra-layer and inter-layer header correlation proves to be very effective in selecting a reduced set ...

10 ,TIMES, 224-GB/S WDM TRANSMISSION OF 56-GBAUD PDM-QPSK SIGNALS OVER 1890 KM OF FIBER

  • Gnauck A.
  • Pupalaikis P.J
  • Raybon G.
  • Schnecker M.
  • Winzer P.

We demonstrate ten-channel wavelength-division-multiplexed (WDM) transmission of 56-Gbaud polarization-division-multiplexed quadrature phase-shift keying signals (i.e., at a line rate of 224 Gb/s) over 1890 km of fiber on a 100-GHz WDM grid (spectral efficiency of ~2 b/s/Hz). The coherent intradyne receiver digitizes the signal at 80 GSamples/s, and is followed by ...

PROPAGATION OVER PARABOLIC TERRAIN: ASYMPTOTICS AND COMPARISON TO DATA

  • Chizhik D.
  • Drabeck L.
  • Macdonald W.

Analysis of radio propagation over varying, clutter-covered terrain was carried out aiming at prediction of power received by a terminal immersed in clutter, with the transmitter placed above clutter. The need for such prediction arises, for example, in planning and assessing coverage and interference in radio communications. Following a general ...

NONUNIFORM LINEAR REGRESSION WITH BLOCK-WISE SAMPLE-MINIMUM PREPROCESSING

  • Hadzic I.
  • Morgan D.

We analyze the statistical properties of slope estimates obtained from linear regression with sample-minimum Erlang variates. The sample-minimum of sequential blocks has the effect of introducing nonuniform time samples. We show that this nonuniformity has negligible effect on the slope estimate variance, but introduces a spurious low-frequency component in the ...

DIGITAL PREDISTORTION FOR POWER AMPLIFIERS USING SEPARABLE FUNCTIONS

  • Jiang H.
  • Wilford P.

This paper is concerned with digital predistortion for linearization of RF high power amplifiers (HPAs). It has two objectives. First, we establish a theoretical framework for a generic predistorter system, and show that if a postdistorter exists, then it is also a predistorter, and therefore, the predistorter and postdistorter are ...

21 DB GAIN 87 LOW-NOISE AMPLIFIER USING 0.18?M SIGE BICMOS

  • Baeyens Y.
  • Chen Y.
  • Lin J.

The performance of a single-ended two-stage high gain low-noise amplifier (LNA) fabricated in a low-cost 200 GHz fT and fmax 0.18 ¿m SiGe BiCMOS technology is presented. The LNA shows a maximum power gain of 21 dB at 87 GHz with a 3 dB bandwidth from 81 to 92.6 GHz. ...

PHOTOEMISSION OF SI 1S?2PZ TRANSITION IN GAAS/ALGAAS QUANTUM WELL FOR ZERO-DIMENSIONAL STATES INFRARED DETECTION

  • Antoni T
  • Berger V.
  • Carras M.
  • Marcadet X.
  • Vinter B.

Intersubband absorption in a GaAs/AlGaAs quantum well usually happens between two two-dimensional (2D) electronic states. However for sufficiently low doping levels, the electrons can be entirely distributed on the silicon localized states. We demonstrate that depending on the temperature, absorption in such structures is dominated either by 2D quantum well ...