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.

TAKING THE SKELETONS OUT OF THE CLOSETS: A SIMPLE AND EFFICIENT TOPOLOGY DISCOVERY SCHEME FOR LARGE ETHERNET LANS

  • Bejerano Y.

We propose a simple and efficient algorithmic solution for discovering the physical topology of large, heterogeneous Ethernet LANs that may include multiple subnets as well as uncooperative network elements, like hubs. Our scheme utilizes only generic MIB information and does not require any hardware or software modification of the underlying ...

OFDMA UPLINK FREQUENCY OFFSET ESTIMATION VIA COOPERATIVE RELAYING

  • Tellambura C
  • Zhongshan Z
  • Zou Wei

Frequency offset estimation for an orthogonal frequency-division multiple access (OFDMA) uplink for amplify-and-forward (AF) relays and a new type of relay (R) called decode-and-compensate-and-forward (DcF) relays are studied. Multiple relays are considered, and the relay with the best S rarr R channel is chosen to perform re-transmission, where S and ...

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 ...

ANALYTICAL MODEL FOR HIERARCHICAL CACHE OPTIMIZATION IN IPTV NETWORK

  • Krogfoss B.
  • Sofman L.

In an IPTV network, video on demand and other video services generate large amount of unicast traffic from video hub office (VHO) to subscribers and, therefore, require additional bandwidth and equipment resources in the network. To reduce this traffic and overall network cost, a portion of the video content (the ...

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 ...

DISTORTION MINIMIZATION IN GAUSSIAN LAYERED BROADCAST CODING WITH SUCCESSIVE REFINEMENT

  • Erkip E.
  • Goldsmith A.
  • Gundunz D
  • Ng C.

A transmitter without channel state information wishes to send a delay-limited Gaussian source over a slowly fading channel. The source is coded in superimposed layers, with each layer successively refining the description in the previous one. The receiver decodes the layers that are supported by the channel realization and reconstructs ...

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 ...

SPECTRALLY EFFICIENT LONG-HAUL OPTICAL NETWORKING USING 112-GB/S POLARIZATION-MULTIPLEXED 16-QAM

  • Buhl L.
  • Doerr C.
  • Gnauck A.
  • Magarini M.
  • Winzer P.

We discuss the generation, wavelength-division-multiplexed (WDM) long-haul transmission, and coherent detection of 112-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM) at a line rate of 14 Gbaud and spectral efficiencies beyond 4 b/s/Hz. We describe the (off-line) digital signal processing and blind filter adaptation algorithms used in our intradyne receiver ...

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 ...

EFFICIENT MEMBRANE GRATING COUPLERS ON INP

  • Doerr C.
  • Dupuis N.
  • Kopf R.
  • Liming Z
  • Long C
  • Weimann N.

We demonstrate an efficient coupler on InP using an etched grating on a suspended InGaAsP membrane. We measure a peak coupling efficiency of 40% (-4 dB) between a cleaved standard single-mode fiber and a conventional nonsuspended InGaAsP waveguide with a 3-dB bandwidth of ~45 nm.

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 ...

MOS-COMPATIBLE SI-RING-ASSISTED MACH–ZEHNDER INTERFEROMETER WITH INTERNAL BANDWIDTH EQUALIZATION

  • Beattie J.
  • Carothers D.
  • Gill D.
  • Hill C.
  • Kamocsai R.L
  • Kun-Yii T
  • Patel S.
  • Pomerene A.
  • Rasras M.
  • White A.
  • Young-Kai C

We demonstrate, to the best of our knowledge, the first electrooptic ring-assisted Mach-Zehnder interferometric (RAMZI) modulator in a CMOS-compatible technology. The RAMZI modulator is manufactured on a CMOS-compatible platform and entirely fabricated in a commercial CMOS foundry. We demonstrate a small-signal 3-dB bandwidth >15 GHz in a silicon-based carrier-depletion modulator ...

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 ...

GLOBAL CRITERIA TO ACCOUNT FOR TOLERANCE TO NONLINEARITIES OF HIGHLY DISPERSIVE SYSTEMS

  • Grellier E.

We numerically investigate the relevance of criteria such as the nonlinear phase or the inline cumulated dispersion to assess the tolerance to nonlinearities of highly dispersive optical transmission systems. For such systems, we propose and validate new rules to predict the performance of systems with different residual dispersion per span ...

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 ...

NON-BLOCKING CONDITIONS FOR EGS NETWORKS

  • Busi I
  • Pattavina A.

A class of multistage interconnection networks, known as extended generalized shuffle (EGS) network, is here considered; it is built with arrays of elementary switching elements, interconnected by shuffle patterns, and external splitters and combiners. New results are given here that reduce the splitter fanout required to make the network strictly ...

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. ...

DECENTRALIZED DYNAMIC SPECTRUM ALLOCATION BASED ON ADAPTIVE ANTENNA ARRAY INTERFERENCE MITIGATION DIVERSITYTRANSMISSION

  • Abramovich Y.
  • Kuzminskiy A.

A new class of decentralized dynamic spectrum allocation (DSA) algorithms that exploit adaptive antenna array interference mitigation (IM) diversity at the receiver, is proposed for interference-limited environments with high level of frequency reuse. The system model consists of base stations (BS) that can optimize uplink frequency allocation to their subscriber ...

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 ...