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This paper proposes a distributed compressive sensing (CS) scheme for robust image transmission over unknown or time-varying channels with highly correlated images at the decoder. A compressed thumbnail is first transmitted after digital forward error correction (FEC) and modulation to retrieve highly correlated images and generate a side information (SI) at the decoder. The current residual image...
The microwave and optical parameters of a ridge type polymer electrooptic modulator have been studied in light of the changes in different structural parameters. The quasi-static finite element technique is used to obtain the potential distribution as solution of Laplace equation over the cross-sectional domain. Thus the microwave field, power, effective index and characteristic impedance have been...
In this manuscript, an artificial immune network was applied to the inverse problem of maximization of complete photonic band gaps in two-dimensional photonic crystals. The computation of dispersion relations in such structures were carried out by means of the MIT Photonic-Bands package. Because of its multimodal searching capability, the artificial immune network could reach similar results, as well...
In Video-on-Demand system, periodic broadcasting is the most bandwidth-efficient method to provide clients with popular videos. Many broadcasting schemes have been proposed to reduce server's bandwidth as well as client's waiting time. However, most of the schemes assume clients to have enough reception bandwidth, which is impractical since client's reception bandwidth varies, especially in wireless...
Direct modulation of membrane DFB laser was carried out. Small signal response showed −3dB bandwidth of 9.5 GHz at a bias current of 1 mA. This corresponds to modulation current efficiency factor of 9.8 GHz/mA½.
An analytical framework is presented to integrate link padding mechanisms to the functioning of intermediate relays in anonymous networks such that a desired degree of anonymity- secrecy of source destination pairs- is achieved against timing analysis without adding significant latency. In particular, the relays for routing and the degree of link padding at each relay are chosen to optimize the tradeoff...
There is increased interest in using transponded payloads to provide jam-resistant links to users. In the type of system we consider, multiple user terminals transmit to a satellite using a coordinated frequency hopping waveform, and the received signals are relayed to a ground processing “hub” terminal for baseband processing. In this paper, expressions for computing end-to-end signal-to-noise ratios...
By the theory of Bethe-hole coupling, a new modified multi-hole directional coupler based on the ridged rectangular waveguide is proposed in this paper. Three kinds of coupling-hole configurations, namely, circular hole, triangle hole and square hole, are investigated for realizing the wide band coupling between two different transmission lines. After extensive simulation and analysis, square hole...
We exploit the unique properties of a long thick silicon waveguide to harness Kerr nonlinearity with ultra-low loss for on-chip RF photonic signal processing. We demonstrate an instantaneous frequency measurement system with 40 GHz bandwidth and record-low measurement error.
Sparse matrix-vector multiplication (shortly spMV) and transposed spMV (shortly spMTV) are the most common routines in the numerical linear algebra. Sparse storage formats describe a way how sparse matrices are stored in a computer memory. Since the commonly used storage formats (like COO or CSR) are not sufficient for high-performance computations, extensive research has been conducted about maximal...
Millimeter-wave communications are expected to play a key role in future 5G mobile networks to overcome the dramatic traffic growth expected over the next decade. Such systems will severely challenge antenna technologies used at mobile terminal, access point or backhaul/fronthaul levels. This paper provides an overview of the authors' recent achievements in the design of integrated antennas, antenna...
Enhanced coupling in slanted L3 nanocavity array expanded bandwidth to 4 THz at telecom wavelength. High-Q tuned L3 nanocavity realized 1,000 coupled cavities with acceptable propagation loss and delay-bandwidth product over 100.
Software-defined datacenters consolidate discrete hardware units into pools of abstract resource types that are dynamically allocated to the clients sharing the infrastructure. The allocation needs to be both fair to the clients and also make efficient use of the system resources. Unlike approaches that allocate individual resources independently, we propose a model for making integrated allocation...
This article consists of a collection of slides from the authors' conference presentation. Some of the topics discussed include: Overview of AMD Radeon R9 Fury; Why HBM and Die Stacking; The Journey to Fury; Performance; Form Factor Innovation.
We evaluated wideband 25 Gbps error-free operation of Si slow light modulators. The fluctuation in extinction ratio was 1 dB over the bandwidth. Larger group indices produce larger extinction ratios and lower bit error rates.
A periodic structure of nanoholes in a continuous sheet of graphene over a silicon substrate is analyzed and its application as a terahertz (THZ) polarizer is demonstrated. The effect of the hole geometry on the extinction ratio and the working frequency of the polarizer is investigated. This periodic structure is then used in a double layer structure to realize a substrate-based polarizer with a...
The problem of efficient resource allocation has drawn significant attention in many scientific disciplines due to its direct societal benefits, such as energy savings. Traditional approaches in addressing online resource allocation neglect the potential benefit of feedback information available from the running tasks/loads as well as the potential flexibility of a task to adjust its operation level...
This paper studies the distributed fusion Kalman filtering problem for a class of cyber-physical systems (CPSs), where multiple sensors are arbitrarily deployed to jointly sense the state of underlying physical systems, and the sensor measurements are directly sent to the corresponding sink node. When each local estimate obtained by the sink node is transmitted to a remote information fusion center...
We demonstrate an integrated tunable silicon band-pass filter with low in-band ripples of 0.3 dB, a high contrast of 55 dB, and no free-spectral range. A record bandwidth tuning over 670 GHz was achieved.
The number of available pins in ball grid array (BGA) of modern system-on-chips (SOCs) has been discussed as one of the major bottlenecks to the performance of the processors, for example many-core enabled portable devices, where the package size and PCB floorplan are tightly constrained. A typical SOC package allocates more than half of the pins for power delivery, resulting in the number of IO pins...
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