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检索条件"任意字段=4th IEEE Sensor Array and Multichannel Signal Processing Workshop Proceedings, SAM 2006"

共 65 条记录，以下是21-30 订阅

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A Kalman filtering approach to joint MIMO channel tracking and symbol decoding for orthogonal space-time block codes

A Kalman filtering approach to joint MIMO channel tracking a...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Balakumar, Balasingam Shahbazpanahi, Shahram Kirubarajan, thia McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada Univ Ontario Inst Technol Fac Engn & Appl Sci London ON N6A 3K7 Canada

ISBN: (纸本)1424403081

In this paper, we study the problem of MIMO channel tracking for communication systems that use orthogonal space-time block codes as the underlying space-time coding scheme. For such systems, we develop a two-step channel tracking algorithm. As the first step, our proposed method uses Kalman filtering to obtain an initial channel estimate, for each block, based on the channel estimate obtained for the previous block. In the second step, we use an iterative decision-directed method to refine the initial channel estimate obtained in the first step. We show that due to specific structure of OSTBC, both steps can be significantly simplified. Simulation results show that, for a training repetition period of 10 blocks, this algorithm can have a performance within 1 dB, in terms of SNR, from the coherent ML receiver which has the perfect knowledge of the channel.

关键词： Kalman filters

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Performance of DCMP adaptive array utilizing aggregated microphones

Performance of DCMP adaptive array utilizing aggregated micr...

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4th ieee sensor array and multichannel signal processing workshop

作者： Matsumoto, M. Hashimoto, S. Waseda Univ Dept Appl Phys Shinjuku Ku 55N-4F-10A3-4-1 Okubo Tokyo Japan

ISBN: (纸本)1424403081

Recently, the authors proposed a miniaturized microphone array not utilizing the phase difference but utilizing the directivity of each microphone, namely aggregated microphones. We have already showed that the phased microphone array and the aggregated microphones can be described within the same framework. We have also showed that it is possible to apply the aggregated microphones to the various methods of the phased microphone array. However, the difference of the performance between the phased array and the aggregated microphones has not been evaluated yet. the effect of the directivity and the posture of each microphone on the performance of the aggregated microphones has not also been evaluated yet. In this paper, we evaluate the performance of DCMP (Directionally Constrained Minimization of Power) adaptive array utilizing aggregated microphones.

关键词： Microphones

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Joint source and relay optimization for a non-regenerative MIMO relay

Joint source and relay optimization for a non-regenerative M...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Fang, Zheng Hua, Yingbo Koshy, John C. Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA Telecordia Technol Adv Wireless Signal Processing Res Red Bank NJ USA

ISBN: (纸本)1424403081

We consider a non-regenerative MIMO relay system where the source, relay and destination are all equipped with multiple antennas. the relay does not decode the packets but performs a multidimensional amplify-and-forward function (a relay matrix) on the baseband signals. Under the condition that the source is white, the relay matrix that maximizes the capacity between the source and the destination has been previously found. In this paper, we show a new result on how the source covariance matrix and the relay matrix can be jointly optimized to maximize the source-destination capacity. It is shown that the optimal coordinate system governed by the previously discovered relay matrix is still valid under the joint optimization, and the joint optimization yields a further capacity gain when the SNR at the relay is low.

关键词： Radio links

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An approach to active sensor imaging

An approach to active sensor imaging

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Demirkol, Askin Acar, Levent Woodley, Robert S. Univ Missouri Dep El & Comp Eng Rolla MO 65401 USA 21st Century Syst Inc Fort Leonard Wood MO USA

ISBN: (纸本)1424403081

In this paper, an alternative Target Density Function (TDF) is proposed to image the radar targets in a dense target environment. It is obtained by considering a novel range and scanning angle plane different from the conventional methods. An alternative method is briefly proposed for smoothing the target density function by taking advantage of Walsh functions. Although the imaging is obtained via the phased array radars, the problem associated with beamforming in linear phased array radar system is bypassed in this new algorithm.

关键词： Radar imaging

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signal strength localization bounds in ad hoc & sensor networks when transmit powers are random

Signal strength localization bounds in ad hoc & sensor netwo...

引用

4th ieee sensor array and multichannel signal processing workshop proceedings, sam 2006

作者： Patwari, Neal Hero III, Alfred O. Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI United States

ISBN: (纸本)1424403081

sensor localization bounds have been derived assuming that received signal strength (RSS) measurements are performed with perfectly known sensor transmit powers. In this paper the Bayesian Cramér-Rao bound is derived assuming transmit powers are random with known prior distribution. Further, both directional measurements on each link, from i to j and from j to i, and their correlation, are explicitly considered. Results show that random transmit powers have a small (5-13%) impact on coordinate estimation bounds. However, using only the average of the directional measurements can significantly increase these bounds. © 2006 ieee.

关键词： signal analysis

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Incorporating pulse-to-pulse motion effects into side-looking array radar models

Incorporating pulse-to-pulse motion effects into side-lookin...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Green, Justin W. Hale, Todd B. Temple, Michael A. Buckreis, John T. USAF Inst Technol Dept Elect & Comp Engn 2950 Hobson Way Wright Patterson AFB OH 45433 USA

ISBN: (纸本)1424403081

A technique is presented for incorporating pulse-to-pulse (inter-pulse) motion effects into side-looking array radar data models yielding a motion-sensitive space-time snapshot. Low flying, highly-maneuverable Unmanned Aerial Vehicles (UAV) represent a potential worst case application scenario given their roll, yaw, and pitch rates are primarily limited by structural integrity. High degrees of maneuverability during the Coherent processing Interval (CPI) allow clutter and target returns to change significantly. the technique presented uses M coordinate transformations to describe platform attitude variations throughout the CPI. Ward's model then is extended to incorporate maneuver-induced changes in spatial frequency and Doppler. the new motion-sensitive space-time snapshot is used to characterize Space Time Adaptive processing (STAP) performance without motion-compensation applied. Results clearly show motion-induced clutter-null broadening with measurable degradation of STAP algorithm minimal discernable velocity.

关键词： Radar systems

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Optimal adaptive array and angle tracking of multiple targets - A re-examination of optimal array processing

Optimal adaptive array and angle tracking of multiple target...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Gu, Huaijin Louisiana Tech Univ Ruston LA USA

ISBN: (纸本)1424403081

the optimal array for detecting the signal from a desired direction but contaminated by receiver noise and strong interference from different sources with unknown arriving-angles is re-examined. the well-known optimal array is obtained by inverting the covariance matrix of interference and noise to maximize the signal to interference and noise ratio (SINR). In practice, the covariance matrix is unknown and has to be estimated by a sample covariance matrix. the optimal array is thus estimated by inverting the sample covariance matrix. this procedure has been employed in optimal array research without challenge. However, it is shown in this paper that the estimated optimal array fails to yield the highest SINR in the case of unknown arriving-angles. Instead the highest SINR can be achieved by optimally estimating the arriving-angles of interference followed by a constrained matched filter, which maximizes the signal to noise ratio subject to canceling the interference from the estimated arriving-angles. In order to reduce the computational burden, an angle-tracking system for multiple targets is adopted to achieve the optimal estimation of arriving-angles. the resulting system of angle-tracking adaptive array offers the highest SINR at a computational burden only on the order of N . M-2 multiplications within a radar range-cell Delta tau, rather than N-3 multiplications in the well-known but questionable estimated optimal array. Here N is the number of sensors in the array and M the number of interference sources. Typically, N = 1,000 in a planar radar array, M = 2 similar to 10 and Delta tau = 1 mu S. Numerical simulations confirm the theoretical results.

关键词： array processing

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threshold optimization for distributed detection using particle filtering methods

Threshold optimization for distributed detection using parti...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Kyriakides, I. Cochran, D. Arizona State Univ Dept Elect Engn Tempe AZ 85287 USA

ISBN: (纸本)1424403081

Local processing on the nodes of a distributed sensing and processing system has the benefits of reducing the data volume transferred from the nodes to the fusion center, reducing both transmission power requirements and the computational burden on the fusion center. the individual nodes obtain measurements from the environment and transmit a quantized detection statistic to the fusion center. Quantization threshold levels need to be found for each sensor that maximize the performance of the system. We propose a global optimization method, the particle filtering optimization method, that uses particle filtering to propagate the values of the thresholds of a distributed detection system to sensor threshold values that are optimal with respect to some measure of system performance. We demonstrate, through simulations, the effectiveness of the particle filtering optimization method in finding the threshold of each of the sensors used in detection scenario.

关键词： sensor arrays

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Indoor localization using subspace matching: An experimental evaluation

Indoor localization using subspace matching: An experimental...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Tsuji, Hiroyuki Kikuchi, Shohei Kaveh, Mostafa Natl Inst Informat & Commun Technol 3-4Hikarino Oka Yokosuka Kanagawa 2390847 Japan Keio Univ Sch Integrated Design Engn Yokohama Kanagawa 2238522 Japan Univ Minnesota Minneapolis MN 55455 USA

ISBN: (纸本)1424403081

We propose a method of indoor localization using array sensors. this method uses not only the signal strengths of received signals, but also the spatial information of impinging signals on array sensors. the signal subspaces, which include information about the strengths and angles of arrival of impinging signals on the array sensors, are used to identify the location of the terminal. We use the cosines of the principal angles between the signal subspaces of the spatial covariance matrices of the signals received at an array antenna to measure the similarity between signals transmitted from two locations. We conducted an experiment indoors to confirm the validity and effectiveness of our method. the experimental results confirm its effectiveness.

关键词： sensor arrays

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Extreme beam broadening using phase only pattern synthesis

Extreme beam broadening using phase only pattern synthesis

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Brown, George C. Kerce, J. Clayton Mitchell, Mark A. Georgia Inst Technol Georgia Tech Res Inst Sensors & Electromagnet Applicat Lab Atlanta GA 30332 USA

ISBN: (纸本)1424403081

this paper describes methods for broadening the beam of a phased array antenna using phase-only element weights. this type of broadening can be valuable for improving the search occupancy and/or reducing the search frame time for large phased arrays, when transmit beam broadening is combined with multiple simultaneous receive beams. Phase-only broadening is required for typical solid-state (active phased) arrays because control of the transmit amplitude at each element is not practical. A notable result is that there is a relationship between the amount of beam broadening and the efficiency (directivity) of the resulting beam. In particular it is shown that broadening less than similar to 2.5:1 results in reduced beam efficiency for both linear and circular arrays, while a broadening of greater than similar to 2.5:1 results in improved beam efficiency, and that, therefore, certain broadening configurations will be preferable to the radar designer (e.g. 4:1 in one plane rather than 2:1 in two planes, due to a large difference in efficiency). the algorithms used to achieve the broadening patterns presented here are based on a combination of homotopy from known optimality with a stochastic gradient descent approach using a carefully constructed one parameter family of penalty functions.

关键词： pattern synthesis wideband array processing transmit spoiling null control

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