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Electrical and Computer Engineering Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
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- Channel estimation (11)
- Estimation (7)
- Phase noise (7)
- MIMO (5)
- Relays (5)
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- Signal to noise ratio (5)
- Synchronization (5)
- Receivers (4)
- Bit error rate (3)
- Cooperative systems (3)
- Cramér-Rao lower bound (CRLB) (3)
- OFDM (3)
- Signal processing algorithms (3)
- Attenuation (2)
- Cooperative communications (2)
- Detectors (2)
- Frequency estimation (2)
- Frequency synchronization (2)
- Joints (2)
- Multiple-input multiple-output (MIMO) (2)
- Satellite broadcasting (2)
- Satellites (2)
- Training (2)
- Transceivers (2)
- Wiener phase noise (2)
- Wireless communication (2)
- 5G mobile communication (1)
- Accuracy (1)
- Amplify-and-forward (1)
- Amplify-and-forward (AF) (1)
- Publication Year
Articles 31 - 41 of 41
Full-Text Articles in Electrical and Computer Engineering
Bounds On Timing Jitter Estimation In Cooperative Networks, Hani Mehrpouyan, Steven Blostein
Bounds On Timing Jitter Estimation In Cooperative Networks, Hani Mehrpouyan, Steven Blostein
Hani Mehrpouyan
Successful collaboration and resource sharing in cooperative networks require accurate estimation of multiple timing jitters. When combined with signal processing algorithms the estimated timing jitters can be applied to mitigate the resulting inter-symbol interference (ISI) and improve performance. In this paper we seek to derive the Cramer-Rao lower bounds (CRLB) for timing jitter estimation in distributed cooperative networks. In addition to being a benchmark for judging the performance of timing jitter estimators, the CRLBs can be applied to determine the effect of the choices of training sequence and cooperative protocol on timing jitter estimation.
Synchronization In Cooperative Networks: Estimation Of Multiple Carrier Frequency Offsets, Hani Mehrpouyan, Steven Blostein
Synchronization In Cooperative Networks: Estimation Of Multiple Carrier Frequency Offsets, Hani Mehrpouyan, Steven Blostein
Hani Mehrpouyan
The distributed nature of cooperative networks may result in multiple carrier frequency offsets (CFOs), which make the channel time-varying and overshadow the performance gainspromised by collaborative communications. However, much of the analysis in the area of cooperative communications assumes perfect synchronization. This paper seeks to address frequency synchronization in cooperative communication systems, where CFO estimation using a training sequence is analyzed. The Cramer-Rao lower bound (CRLB) for various cooperative protocols is derived. In the next step, we propose two computationally efficient iterative estimators based on the MUltiple SIgnal Characterization (MUSIC) algorithm, that can estimate the CFOs from all the relays …
Ziv–Zakai Bounds On Image Registration, M. Xu, Hao Chen, P. K. Varshney
Ziv–Zakai Bounds On Image Registration, M. Xu, Hao Chen, P. K. Varshney
Hao Chen
Image registration is a fundamental and important task in image processing. The goal essentially is to estimate the transformation that aligns two images. We focus on the general rigid body transformation case. In this paper, we derive the Ziv-Zakai bounds (ZZB) on image registration by assuming an uncertainty model for the rotation and translation errors, and propose to use the ZZB as a benchmark to evaluate the registration ability of an image pair. We also compare the performance of several image registration algorithms with the derived bounds when applied to several datasets.
Application Of Phase Shift In Coherent Multi-Relay Mimo Communications, Yi Zheng, Hani Mehrpouyan, Steven Blostein
Application Of Phase Shift In Coherent Multi-Relay Mimo Communications, Yi Zheng, Hani Mehrpouyan, Steven Blostein
Hani Mehrpouyan
In this paper we propose an enhancement to the Amplify and Forward (AF) protocol. The proposed multi-relay scheme assumes that the source, destination, and each relay have M, N, and 1 antennas, respectively. It is assumed that the source does not have access to the channel state information and takes advantage of uniform spatial multiplexing. Unlike the conventional AF scheme, the proposed scheme allows for each relay to adjust the phase of received signal before applying the AF protocol. Imperfect channel estimation and its effect on the performance of the multi-relay scheme is also investigated. In determining the parameters, …
Arma Synthesis Of Fading Channels, Hani Mehrpouyan, Steven D. Blostein
Arma Synthesis Of Fading Channels, Hani Mehrpouyan, Steven D. Blostein
Hani Mehrpouyan
Computationally scalable and accurate estimation, prediction, and simulation of wireless communication channels is critical to the development of more adaptive transceiver algorithms. Previously, the application of autoregressive moving average (ARMA) modeling to fading processes has been complicated by ill-conditioning and nonlinear parameter estimation. This correspondence presents a numerically stable and accurate method to synthesize ARMA rational approximations of correlated Rayleigh fading processes from more complex higher order representations. Here, the problem is decomposed into autoregressive (AR) model matching followed by linear system identification. Performance is compared to that of AR, inverse discrete Fourier transform, and sum of sinusoids techniques. Also, …
Wireless Valuables Monitoring Device, With Proximity Sensing And Automatic Arming And Disarming, Hani Mehrpouyan, Christopher Mitchell, Matthew T. Brown
Wireless Valuables Monitoring Device, With Proximity Sensing And Automatic Arming And Disarming, Hani Mehrpouyan, Christopher Mitchell, Matthew T. Brown
Hani Mehrpouyan
The invention relates to apparatus and methods for detecting when an object is disturbed and generating an alarm in response thereto. The invention has general application to protecting valuables. Some embodiments of the invention are applied to protect laptop computers or other portable electronic devices.
Arma Synthesis Of Fading Channels: An Application To The Generation Of Dynamic Mimo Channels, Hani Mehrpouyan, Steven D. Blostein
Arma Synthesis Of Fading Channels: An Application To The Generation Of Dynamic Mimo Channels, Hani Mehrpouyan, Steven D. Blostein
Hani Mehrpouyan
Adaptive transceivers play an important role in wireless communications and the design of MIMO systems. Therefore models that enable simulation of dynamic and time varying channels in a computationally scalable fashion are extremely valuable. Previously, the application of autoregressive moving average (ARMA) modeling to fading processes has been complicated by ill-conditioning and nonlinear parameter estimation. This paper presents a numerically stable and accurate method to synthesize ARMA rational approximations of correlated Rayleigh fading processes from more complex higher order representations. The resulting ARMA synthesis is then used in the generation of dynamic MIMO channel realizations with time varying Doppler at …
Random Antenna Selection & Antenna Swapping Combined With Ostbcs, Hani Mehrpouyan, Steven D. Blostein, Edmund C.Y. Tam
Random Antenna Selection & Antenna Swapping Combined With Ostbcs, Hani Mehrpouyan, Steven D. Blostein, Edmund C.Y. Tam
Hani Mehrpouyan
This paper proposes a novel and efficient iterative antenna selection algorithm based on an SNR selection criterion for a multi-input-multi-output (MIMO) system employing orthogonal space time block codes (OSTBCs), specifically Alamouti codes. The proposed algorithm addresses the open problem of finding a suboptimal set of transmit and receive antennas that performs close to the globally optimum configuration selection solution at significantly reduced complexity. Also, the paper is proposing a method to incrementally update the selected set of antennas, so as to enable even greater complexity reduction, and in particular, for the case of channels with temporal or time correlation. To …
Method For Cleaning Phosphor Screens For Use With Field Emission Displays - Micron Technology Inc. (Boise, Id) - United States Patent 6409564, Jim Browning, Zhongyi Xia, David A. Cathey, Surjit S. Chadha
Method For Cleaning Phosphor Screens For Use With Field Emission Displays - Micron Technology Inc. (Boise, Id) - United States Patent 6409564, Jim Browning, Zhongyi Xia, David A. Cathey, Surjit S. Chadha
Jim Browning
A method for cleansing the phosphor screen of a display device comprising the removal of oxygen or sulfur from the surface of the phosphor, and/or its associated binder material, to a depth that prevents oxygen diffusion from the phosphor and/or binder, thereby creating an oxygen deficient surface on the phosphors.
Identifying And Disabling Shorted Electrodes In Field Emission Display - Micron Technology Inc. (Boise, Id) - United States Patent #6034480, Jim Browning, John K. Lee, Tyler A. Lowrey
Identifying And Disabling Shorted Electrodes In Field Emission Display - Micron Technology Inc. (Boise, Id) - United States Patent #6034480, Jim Browning, John K. Lee, Tyler A. Lowrey
Jim Browning
Methods and apparatus for identifying and disabling shorted electrode pairs (such as field emitter tip electrodes shorted to grid electrodes) in a field emission display by applying a test voltage across the two electrodes in each pair. The magnitude of the test voltage is set below the voltage required to initiate field emission from the emitter tip electrode. Because no field emission occurs at this voltage, the test voltage should produce no current flow through good (non-shorted) emitter tips. However, current will flow through emitter tips which are shorted to their respective grid electrodes. In one embodiment, the current flow …
Fabrication Of Field Emission Array With Vacuum Cathodic Arc Deposition - Micron Technology Inc. (Boise, Id) - United States Patent #6027619, David A. Cathey, Jim Browning, Zhong-Yi Xia
Fabrication Of Field Emission Array With Vacuum Cathodic Arc Deposition - Micron Technology Inc. (Boise, Id) - United States Patent #6027619, David A. Cathey, Jim Browning, Zhong-Yi Xia
Jim Browning
A filtered cathodic vacuum arc is used as a source of metal to generate a highly directional beam of metal ions having substantially larger velocity parallel to the axis of the beam (perpendicular to the surface of the target) than perpendicular to the axis of the beam. This ion beam, with energies ranging up to 80 cV, is used to deposit metal into the bottom of high aspect (typically greater than 3 to 1) openings, for example, to deposit titanium in the bottom of deep contact holes in semiconductor devices or to deposit molybdenum to form tips for emitters for …