Identifiying RFID Tag Categories in Linear Time

  • Kodialam M.
  • Lau W.
  • Nandagopal T.

Given a large set of RFID tags, we are interested in determining the categories of tags that are present in the shortest time possible. Since there can be more than one tag present in a particular category, pure randomized strategies that rely on resolving individual tags are very inefficient. Instead, ...

Demonstration of Frequency-Domain Averaging Based Channel Estimation for 40-Gb/s CO-OFDM with High PMD

  • Kaneda N.
  • Liu X.
  • Shieh W.
  • Yang Q.

We experimentally demonstrate the intra-symbol frequency-domain averaging based channel estimation for a 40-Gb/s polarization- division-multiplexed coherent optical OFDM signal with 8-QAM modulation under large polarization-mode-dispersion, showing improved efficiency as compared to the time-domain averaging based scheme.

A Survey of Research on the Application-Layer Traffic Optimization Problem and the Need for Layer Cooperation

  • Gurbani V.
  • Hilt V.
  • Marocco E.
  • Tomsu M.

A significant part of the Internet traffic today is generated by peer-to-peer (P2P) applications used traditionally for file-sharing, and more recently for real-time communications and live media streaming. Such applications discover a route to each other through an overlay network with little knowledge of the underlying network topology. As a ...

Maximizing Capacity in Arbitrary Wireless Networks in the SINR Model: Complexity and Game Theory

  • Andrews D.
  • Dinitz M.

In this paper we consider the problem of maximizing the number of supported connections in arbitrary wireless networks where a transmission is supported if and only if the signal-to-interference-plus-noise ratio at the receiver is greater than some threshold. The aim is to choose transmission powers for each connection so as ...

Approximation Algorithms for Grooming in Optical Network Design

  • Antonakopoulos S.
  • Zhang Y.

We study traffic grooming in optical network design. The goal is to aggregate low-bandwidth traffic streams to efficiently utilize high-bandwidth media such as wavelength channels. More precisely, given traffic demands to be routed in a network, the design problem is to define a collection of {em light paths} such that ...

400-ns Continuously Tunable Delay of a 10-Gbps Intensity-Modulated Optical Signal

  • Alic N.
  • Jopson R.
  • Myslivets E.
  • Radic S.
  • Windmiller J.

A continuously tunable optical delay line based on a two-pump parametric process in highly nonlinear fiber provided a 400-ns tuning range for a 10-Gbps optical signal. This record 4005-bit delay used fixed dispersion elements, compatible with requirements for fast delay reconfiguration. The large delay range was facilitated by partial dispersion ...

Optical CDMA Code Wavelength Conversion using PPLN to Improve Transmission Security

  • Chowdhury A.
  • Prucnal P.
  • Wang Z.

We demonstrate optical code division multiple access (OCDMA) code conversion in the wavelength domain using periodically poled LiNbO3 for enhanced transmission security. The number of possible OCDMA codes in the channel is greatly increased and randomized dynamic code conversion is feasible, thus making it more difficult for an eavesdropper to ...

Intra-symbol frequency-domain averaging based channel estimation for coherent optical OFDM

  • Buchali F.
  • Liu X.

We present an efficient channel estimation method for coherent optical OFDM (CO-OFDM) based on intra-symbol frequency-domain averaging (ISFA), and systematically study its robustness against transmission impairments such as optical noise, chromatic dispersion (CD), polarization-mode dispersion (PMD), polarization-dependent loss (PDL), and fiber nonlinearity. Numerical simulations are performed for a 112-Gb/s polarizationdivision ...

Latency-free all-optical recognition of 32-bit optical bit patterns at 40 Gb/s using a passive optical correlator

  • Buhl L.
  • Cabot S.
  • Cappuzzo M.
  • Chen Y.
  • Dinu M.
  • Dutta N.
  • Giles R.
  • Gomez L.
  • Jaques J.
  • Kang I.
  • Patel S.
  • Piccirilli A.
  • Rasras M.

We report all-optical detection of 32-bit patterns embedded in 40-Gb/s phase-shift keyed data. The bit-pattern recognition is achieved using matched filtering implemented with a silica waveguide tapped delay-line filter.

Competitive Scheduling for OFDMA Systems with Guaranteed Transmission Rate

  • Cai L.
  • Jiao W.
  • Tao M.

Next-generation broadband wireless standards use Orthogonal Frequency Division Multiple Access (OFDMA) as the preferred physical layer multiple access scheme, especially for the downlink. Due to limited resources available at the base station, multi- user resource allocation is crucial for delivering the applications with various quality-of-service (QoS) demands. We study the ...

EAM-based InP MZ modulator for 40-Gb/s PSBT using 20-Gb/s tributaries

  • Buhl L.
  • Doerr C.
  • Neilson D.
  • Zhang L.

We demonstrate a compact InP phase-shaped binary transmission (PSBT) modulator at 40 Gb/s. It consists of two electro-absorption modulators in a Mach-Zehnder configuration, each driven with 20-Gb/s tributaries with a half bit offset.

Internal bandwidth equalization in a CMOS compatible Si-ring modulator

  • Beattie J.
  • Carothers D.
  • Chen Y.
  • Gill D.
  • Kamocsai R.
  • Patel S.
  • Pomerene A.
  • Rasras M.
  • Tu K.
  • White A.

Bandwidth equalization using a simple CMOS-compatible tunable silicon-ring modulator is shown. We demonstrate a 37 GHz small signal bandwidth and use the resonator to mitigate bandwidth limitations from other measurement system components. Configuring the optical carrier to be off resonance within the ring free spectral range allows high frequency enhancement ...

MEMS Thermal Imager with Optical Readout

  • Aksyuk V.
  • Baker M.
  • Basavanhally N.
  • Bolle C.
  • Bower J.
  • Cirelli R.
  • Ferry E.
  • Fetter L.
  • Jones C.
  • Keller R.
  • Klemens F.
  • Lai W.
  • Mansfield W.
  • Miner J.
  • Pai C.
  • Papazian A.
  • Pardo F.
  • Ramirez A.
  • Ryf R.
  • Simon M.
  • Sorsch T.
  • Stekas B.
  • Taylor J.
  • Vyas B.
  • Watson G.

A cantilever-based uncooled IR imager was developed utilizing a novel optical readout scheme based on inter-pixel interference. A series of small arrays (approximately 100 x 100 pixels) were fabricated using 8-inch silicon CMOS-compatible MEMS processes. The array design and process development will be discussed and initial uniformity and imaging results ...

Coherent Polarization Division Multiplexed QPSK Receiver with Fractionally-Spaced CMA for PMD Compensation

  • Kaneda N.
  • Leven A.

A digital coherent polarization division multiplexed (PDM) QPSK receiver with fractionally spaced constant modulus algorithm (CMA) is implemented in FPGA. Real-time measurements at 5Gbit/s demonstrate that polarization mode dispersion (PMD) can be effectively compensated with multiple number of taps when the received data is two-fold over-sampled. With 4 taps CMA, ...

Decentralized dynamic spectrum allocation based on adaptive antenna array interference mitigation diversity

  • Abramovich Y.
  • Kuzminskiy A.

A new class of decentralized dynamic spectrum allocation (DSA) that exploit adaptive antenna array interference mitigation (IM) diversity at the receiver, is proposed for interference- limited environment with high level of frequency reuse. A system consists of base stations (BS) that may belong to different providers, which can optimize uplink ...

Optimal and Robust MMSE Channel Estimation for MIMO-OFDM Systems

  • Huang D.
  • Luo Z.

In this paper, the minimum mean square error (MMSE) channel estimation for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems is investigated. We first propose an optimal MMSE channel estimation algorithm, which can fully exploit the channel correlations over space, time, and frequency domains to estimate the channel frequency response. ...

Optical OFDM – A Promising High-Speed Optical Transport Technology

  • Buchali F.
  • Dischler R.
  • Liu X.

Orthogonal frequency-division multiplexing (OFDM) is a widely used modulation/multiplexing technology in wireless and data communications. Leveraging recent advances in high-speed CMOS technologies and optical modulation and detection technologies, optical OFDM at 40-Gb/s or even 100-Gb/s information rate becomes feasible. At the optical transmitter, OFDM is realized by a digital signal ...

100-Gb/s Hybrid Opto-electronic Integration

  • Sinsky J.

To implement 100G systems, very high speed electronic and electro- optic system components are essential. Challenges and methodologies for designing 100G opto-electronic components will be discussed, and the need for hybrid integration will be explained.

PMD Compensation/Mitigation Techniques for High-Speed Optical Transport

  • Buelow H.
  • Franz B.
  • Klekamp A.
  • Liu X.
  • Xie C.

In high-speed long-haul optical transport systems with channel data rates at 40 Gbit/s and beyond, polarization-mode dispersion (PMD) is one of the major obstacles that limit system performance. It is desired or in most cases required to increase the system tolerance to PMD through PMD compensation and mitigation. In this ...

Extending Dependencies with Conditions for Data Cleaning

  • Fan W.

Data cleaning aims to effectively detect and repair errors and inconsistencies in real life data. The increasing costs and risks of dirty data highlight the need for data cleaning techniques. This paper provides an overview of recent advances in data cleaning, based on conditional dependencies, an extension of functional and ...