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Context-driven partitioning of signaling energy (CDPSE) to help counter interference in wireless communications

Context-driven partitioning of signaling energy (CDPSE) to h...

引用

Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Hershey, John Hladik, Stephen M. Korkosz, Richard A. General Electric Corp Research & Development Cent Niskayuna United States

The idea is (i) to use a variable energy allocation per signaling symbol and (ii) to pseudorandomize the order in which signaling symbols are transmitted. This strategy will allow the most important part of the sensor data to be (i) decorrelated against periodic unequal power interfering noise and specifically (ii) where that noise is purposely tailored or allocated in an attempt to provide maximum disruption of information transport as in 'smart' jamming. In a very real sense, perfect compression followed by this method leads to a genre of spread spectrum known as Time Hopping (TH).

关键词： signal processing

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Some significant communications processing realized with adaptive Bragg gratings

Some significant communications processing realized with ada...

引用

SPIE Conference on advanced signal processing algorithms, architectures, and implementations ViiI

作者： Upton, E Wickham, M Smith, M Hart, J Flynn, R Havstad, S Nachman, P TRW Co Inc Redondo Beach CA 90278 USA

ISBN: (纸本)0819429163

Higher data capacity demands and lower interference requirements in the wireless communications arena are exploiting higher carrier frequencies and wider modulation bandwidths. Circuitry which can perform intermediate frequency processing over these more demanding ranges is needed to provide complex signal processing without commercial penalties. Photonics technologies utilizing Bragg Grating signal processing (BGSP) can bridge the gap between the very high frequency RF millimeter wave integrated circuit (MIMIC) domains at the antenna interface and the CMOS digital signal processors at the base band frequency interface. The desirable benefits of multiple tap adaptive finite impulse response (FIR) and infinite impulse response (iiR) filters and equalizers are well known;however, they are usually the province of digital signal processing and force the sample rates prior to these processors to a higher overall system power consumption level. BGSP provides these functions with discrete taps and digital controls but at the bandwidths usually reserved for RF circuitry because the actual processing occurs at optical frequencies and at wave lengths which are compatible with integrated circuit technologies. The high performance benefits of photonic processing can be realized if the stability control of the Bragg grating is derived from the same metric which induces in photonics its sensitivity to drift. We will present a orthogonally coded tap modulation technique which stabilizes the transfer function of the signal processor and enables significant adaptive IF signal processing to be obtained with very low size, weight, and power. Our demonstration of a photonic proof-of-concept architecture is a reconfigurable multiple tap FIR filter that is dynamically controlled to perform low pass, high pass, band pass, and band stop filters operating over bandwidths of 3 GHz.

关键词： signal processing Fiber Bragg gratings Filtering (signal processing) Control systems Linear filtering Digital signal processing Optical filters Servomechanisms Modulators Electronic filtering

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SLAPP: A special purpose multiprocessor array for signal processing and linear algebra 2

SLAPP: A special purpose multiprocessor array for signal pro...

引用

advanced algorithms and architectures for signal processing ii 1987

作者： Symanski, J.J. Henderson, Tom Shirasago, Judy Celto, John Drake, Barry Naval Ocean Systems Center San DiegoCA92152 United States

The key to meeting the extremely high throughput requirements of future military signal and image processing systems is parallelism in algorithms and hardware. This paper will describe the implementation of a core set of algorithms on one possible hardware implementation, designed to achieve high speed and efficient parallelism. This approach and design procedure, while using currently available integrated circuit building blocks, is similar to how this type of processor will be developed in the future using VLSI. © 1988 SPIE. All rights reserved.

关键词： Linear algebra

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Regression in sensor networks: Training distributively with alternating projections

Regression in sensor networks: Training distributively with ...

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advanced signal processing algorithms, architectures, and implementations XV

作者： Predd, Joel B. Kulkarni, Sanjeev R. Vincent Poor, H. Department of Electrical Engineering Princeton University Princeton NJ United States

Wireless sensor networks (WSNs) have attracted considerable attention in recent years and motivate a host of new challenges for distributed signal processing. The problem of distributed or decentralized estimation has often been considered in the context of parametric models. However, the success of parametric methods is limited by the appropriateness of the strong statistical assumptions made by the models. In this paper, a more flexible nonparametric model for distributed regression is considered that is applicable in a variety of WSN applications including field estimation. Here, starting with the standard regularized kernel least-squares estimator, a message-passing algorithm for distributed estimation in WSNs is derived. The algorithm can be viewed as an instantiation of the successive orthogonal projection (SOP) algorithm. Various practical aspects of the algorithm are discussed and several numerical simulations validate the potential of the approach.

关键词： signal processing

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signal selection method of a directional diversity for VSB receiver

Signal selection method of a directional diversity for VSB r...

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advanced signal processing algorithms, architectures, and implementations XV

作者： Bae, Jae Hwui Kim, Juyeun Lim, Jong Soo Lee, Soo In Han, Dong Seok Electronics and Telecommunication Research Institute Kyungpook National University

We propose an output signal selection method for the directional diversity in VSB receiver which is to improve the reception performance of VSB system in severe Rayleigh fading channel. The VSB system has only about 0.3% of known training signal for the receiver in a data field and the reception performance of VSB receiver is degraded significantly when there are near-0 dB ghosts in received signal. To overcome this problem, the directional diversity is suggested. In directional diversity the selection of an output signal with best channel condition in point of VSB equalizer is very important to improve VSB reception performance. For the selection of the optimal signal, we extracted channel profiles in time domain for all the signals by correlating the PN511 sequence in VSB field sync and selected one signal by comparing the channel profiles. The simulation results show that the proposed method selects a signal with the best channel condition among the signals, so the reception performance of the VSB system can be improved in severe Rayleigh channels.

关键词： signal receivers

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On the regularized solution of block banded block Toeplitz systems

On the regularized solution of block banded block Toeplitz s...

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Conference on advanced signal processing algorithms, architectures, and implementations X

作者： Bini, DA Farusi, A Fiorentino, G Meini, B Dipartimento Matemat I-56127 Pisa Italy

ISBN: (纸本)0819437611

Given two n. x n Toeplitz matrices T-1 and T-2, and a vector b epsilon R-n2, consider the linear system Ax = b - eta, where eta epsilon R-n2 is an unknown vector representing the noise and A = T-1 x T-2. Recovering approximations of a, given A and b, is encountered in image restoration problems. We propose a method for the approximation of the solution a: that has good regularization properties. The algorithm is based on a modified version of Newton's iteration for matrix inversion and relies on the concept of approximate displacement rank. We provide a formal description of the regularization properties of Newton's iteration in terms of filters and determine bounds to the number of iterations that guarantee regularization. The method is extended to deal with more general systems where A = Sigma (h)(i=1) T-1((i)) x T-2((i)). The cost of computing regularized inverses is O(n log n) operations (ops), the cost of solving the system Ax = b is O(n(2) log n) ops. Numerical experiments which show the effectiveness of our algorithm are presented.

关键词： Band Toeplitz systems Newton's iteration regularization displacement rank image processing

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Naval Research Lab. flex processor for radar signal processing

Naval Research Lab. flex processor for radar signal processi...

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advanced signal processing algorithms, architectures, and implementations ii

作者： Alter, James J. Evins, James B. Letellier, J.P. Naval Research Lab. Washinton DC USA

ISBN: (纸本)0819406945

This paper describes a programmable radar signal processor architecture developed at the Naval Research Laboratory (NRL). The design incorporates T.I. TMS320C30 programmable digital signal processor devices, Xilinx programmable gate arrays, TRW FFT devices, and a parallel array of Inmos Transputer microprocessors. The architecture is extremely flexible and is applicable to a wide variety of applications.

关键词： Radar

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A DSP implementation of source location using microphone arrays 6

A DSP implementation of source location using microphone arr...

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Conference on advanced signal processing algorithms, architectures, and implementations VI

作者： Rabinkin, DV Renomeron, RJ Dahl, A French, JC Flanagan, JL Bianchi, MH RUTGERS STATE UNIV CTR COMP AIDS IND PRODPISCATAWAYNJ 08855

ISBN: (纸本)0819422347

The design, implementation, and performance of a low-cost, real-time DSP system for source location is discussed. The system consists of an 8-element electret microphone array connected to a signalogic DSP daughterboard hosted by a PC. The system determines the location of a speaker in the audience in an irregularly shaped auditorium. The auditorium presents a non-ideal acoustical environment;some of the walls are acoustically treated, but there still exists significant reverberation and a large amount of low frequency noise from fans in the ceiling. The source location algorithm is implemented in a two step process: The first step determines time delay of arrival (TDOA) for select microphone pairs. A modified version of the Cross-Power Spectrum Phase Method is used to compute TDOAs and is implemented on the DSP daughterboard. The second step uses the computed TDOAs in a least mean squares gradient descent search algorithm implemented on the PC to compute a location estimate. © 1996 SPIE. All rights reserved.

关键词： microphone arrays speech source location real-time processing

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On second-order statistics-based blind equalization of FIR/iiR multiple-input multiple-output channels with common zeros

On second-order statistics-based blind equalization of FIR/I...

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SPIE Conference on advanced signal processing algorithms, architectures, and implementations ViiI

作者： Tugnait, JK Huang, B Auburn Univ Dept Elect Engn Auburn AL 36849 USA

ISBN: (纸本)0819429163

The problem of blind equalization of MIMO (multiple-input nultiple-output) communications channels is considered using the second-order statistics of the data. Such models arise when a single receiver data from multiple sources is fractionally sampled (assuming that there is excess bandwidth), or when an antenna array is used with or without fractional sampling. We focus on direct design of finite-length MMSE (minimum mean-square error) blind equalizers. We allow infinite impulse response (iiR) channels. Our approaches also work when the "subchannel" transfer functions have common zeros so long as the common zeros are minimum-phase zeros. We only require that the there exist a causal, stable left inverse (not necessarily unique) to the MIMO transfer function and that the leading coefficient matrix of the MIMO channel impulse response have its rank equal to the number of sources. The channel length or model orders need not be known. The sources are recovered up to a unitary mixing matrix and are further 'unmixed' using higher-order statistics of the data. An illustrative simulation example is provided.

关键词： spatio-temporal processing multiple-input multiple-output channels multiaccess systems blind equalization space diversity time diversity fractional sampling

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Design of a hybrid prefix adder for non-uniform input arrival times

Design of a hybrid prefix adder for non-uniform input arriva...

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Conference on advanced signal processing algorithms, architectures and implementations Xii

作者： Choi, Y Swartzlander, EE Univ Texas Elect & Comp Engn Dept Austin TX 78712 USA

ISBN: (纸本)0819445584

This paper examines the design of a hybrid prefix adder under the condition of non-uniform input signal arrival. This is encountered in the final adder for fast parallel multipliers, which use column compression reduction. The prefix graph scheme efficiently accommodates the non-uniform arrival times. Rules are presented for designing hybrid prefix adders under such conditions. This rule produces adders which are faster and less complex than previous work.

关键词： prefix adder non-uniform input signal arrival parallel multipliers

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