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检索条件"任意字段=Sensor Array and Multichannel Signal Processing Workshop"

共 2593 条记录，以下是331-340 订阅

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Integrated waveform design for an Integrated Radar and Communication System with a Uniform Linear array 11

Integrated waveform design for an Integrated Radar and Commu...

引用

IEEE 11th sensor array and multichannel signal processing workshop (SAM)

作者： Jiang, Mengchao Liao, Guisheng Yang, Zhiwei Liu, Yongjun Chen, Yufeng Li, Haichuan Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China

ISBN: (纸本)9781728119465

To reduce the consumption of spectrum and hardware resource, two methods are proposed to design the integrated waveform that can satisfy the requirements for both radar and communication. First, a linear superposition (LS) method is proposed to design the transmit waveforms of a uniform linear array (ULA). In the far field of the ULA, the designed transmit waveforms can simultaneously synthesize the desired radar and communication waveforms in different directions. However, the designed waveforms usually have high peak-to-average power ratio (PAPR). Then, an alternative projection (AP) method is proposed to reduce the PAPR of the transmit waveforms. The AP method can devise the waveforms with constant modulus. Both the proposed methods can perform radar and communication function in different directions. Finally, several simulation results are given to verify the effectiveness of the proposed methods.

关键词： waveform design integrated radar and communication spectral sharing waveform synthesis

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Impact of wideband channel-to-channel mismatch on adaptive arrays

Impact of wideband channel-to-channel mismatch on adaptive a...

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1st IEEE sensor array and multichannel signal processing workshop (SAM 2000)

作者： Aalfs, DD Holder, EJ Georgia Inst Technol Georgia Tech Res Inst Atlanta GA 30332 USA

ISBN: (纸本)0780363396

The wide waveform bandwidths desired for fine range resolution in current and future phased array radars have an impact on the performance of adaptive digital beamforming (ADBF) dale to the inevitable frequency response mismatches that occur from channel to channel across the band. In previous work, analytical expressions for the correlation between channels have been developed for a simple two element array with a sinusoidal ripple in either the amplitude or phase response in one of the channels. This paper extends those results to a more general model that allows larger arrays utilizing time delay steering to be modeled. Expressions are developed for the correlation between channels as a function of the parameters of the channel frequency responses. The performance of the adaptive beamformer is characterized with respect to SINE for waveforms that are flat over the bandwidth and for LFM waveforms processed using stretch processing.

关键词： Adaptive arrays Bandwidth Broadband antennas Delay effects Frequency response Jamming Phased arrays signal processing signal to noise ratio Wideband

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Underdetermined DOA Estimation of Quasi-Stationary signals in the Presence of Malfunctioning sensors 11

Underdetermined DOA Estimation of Quasi-Stationary Signals i...

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IEEE 11th sensor array and multichannel signal processing workshop (SAM)

作者： Sun, Weize Xu, Chuangxiang Huang, Yingying Huang, Lei nShenzhen Univ Guangdong Lab Artificial Intelligence & Cyber Eco Shenzhen Peoples R China Shenzhen Univ Guangdong Lab Artificial Intelligence & Cyber Eco Shenzhen Peoples R China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119465

This paper address the problem of direction-of-arrival (DOA) estimation of quasi-stationary signals based on uniform linear array with malfunctioning sensors. By utilizing the subspace structures of the local second-order statistics of quasi-stationary signals, a Khatri-Rao subspace approach is developed. Our scheme first collects the local covariance matrices of the source signals and then transfers them into a new virtual linear array which can identify at least twice as much DOAs as to the original physical one. It is also shown that the coprime configuration is a special case of the proposed model therefore the same techniques can be applied directly. Simulations are also carried out for the comparison of the proposed algorithm and state-of-the-art approaches.

关键词： parameter estimation direction-of-arrival estimation malfunctioning sensors coprime array

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Multi-bit Decentralized Detection of a Non-cooperative Moving Target Through a Generalized Rao Test 11

Multi-bit Decentralized Detection of a Non-cooperative Movin...

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IEEE 11th sensor array and multichannel signal processing workshop (SAM)

作者： Cheng, Xu Ciuonzo, Domenico Rossi, Pierluigi Salvo Wang, Xiaodong Shi, Longfei Natl Univ Def Technol CEMEE Changsha Peoples R China Armed Police Coll PAP Beijing Peoples R China Univ Naples Federico II Naples Italy NTNU Trondheim Norway Columbia Univ ECE New York NY 10027 USA

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119465

We consider decentralized detection (DD) of an uncooperative moving target via wireless sensor networks (WSNs), measured in zero-mean unimodal noise. To address energy and bandwidth limitations, the sensors use multi-level quantizers. The encoded bits are then reported to a fusion center (FC) via binary symmetric channels. Herein, we propose a generalized Rao (G-Rao) test as a simpler alternative to the generalized likelihood ratio test (GLRT). Further, the asymptotic performance of a trajectory-clairvoyant (multi-bit) Rao test is leveraged to develop an offline and per-sensor quantizer design. Simulations show the appeal of G-Rao test with respect to the GLRT, and the gain in detection by using multiple bits for quantization.

关键词： Decentralized detection Generalized Rao test GLRT multibit quantizer wireless sensor networks

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A GRIDLESS WIDEBAND DOA ESTIMATION BASED ON ATOMIC NORM MINIMIZATION 11

A GRIDLESS WIDEBAND DOA ESTIMATION BASED ON ATOMIC NORM MINI...

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IEEE 11th sensor array and multichannel signal processing workshop (SAM)

作者： Jiang, Yuanyuan Li, Dan Wu, Xiaohuan Zhu, Wei-Ping Nanjing Univ Posts & Telecommun Key Lab Broadband Wireless Commun & Sensor Networ Nanjing Peoples R China Concordia Univ Dept Elect & Comp Engn Montreal PQ Canada

ISBN: (纸本)9781728119465

This paper proposes a new method for wideband direction-of-arrival (DOA) estimation. The main idea of the proposed method is focusing the array output on frequency point to the reference frequency point. But different from coherent signal-subspace method (CSSM), it has no requirement of an initial DOA estimation. Atomic norm minimization (ANM) is then applied after the focusing step. Our proposed method is able to achieve better estimation performance than other wideband DOA estimators. Numerical simulations are carried out to demonstrate the performance of the proposed method compared to existing ones.

关键词： DOA estimation wideband source signal focusing atomic norm minimization (ANM)

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Toward bandwidth invariance of spatial processing in the non-cooperative receiver

Toward bandwidth invariance of spatial processing in the non...

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4th IEEE sensor array and multichannel signal processing workshop

作者： Shaw, Arnab Jamali, Moshin Wilkins, Nathan Wright State Univ 3640 Colonel Glenn Highway Dayton OH 45435 USA Univ Toledo Toledo OH 43606 USA AF Res Lab Wright Patterson AFB OH 45433 USA

ISBN: (纸本)1424403081

As the modern electro-magnetic environment in urban and battlefield scenarios becomes increasingly denser, system designers tend to gravitate toward wide bandwidth solutions. Not only do spread spectrum designs permit increased co-channel utilization, they also tend to be inherently more secure, decreasing the probability of intercept by non-cooperative receivers. This is in part due to the code that must be applied in order to modulate the information bandwidth into a much wider transmitted bandwidth. In addition the non-cooperative receiver must contend with issues of increased noise, decreased sensitivity, and increased signal processing resource requirements among others. The problem is further exacerbated for receivers that must perform emitter geo-location or other forms of spatial processing, since the conventional high-resolution techniques rely on phase measurements based on the monochromatic assumption. This paper will discuss some of the existing methods suggested to contend with wide bandwidth spatial processing for noncooperative receivers and their limitations. It will introduce a new method based on the bilinear transformation that overcomes some of these limitations. It will present simulation results that demonstrate the advantage of this technique.

关键词： signal receivers

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Hybrid Interference Mitigation Using Analog Prewhitening 11

Hybrid Interference Mitigation Using Analog Prewhitening

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IEEE 11th sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Wei Jiang, Yi Zhou, Bin Hu, Die Fudan Univ Dept Commun Sci & Engn Shanghai Peoples R China Chinese Acad Sci Key Lab Wireless Sensor Network & Commun Beijing Peoples R China

ISBN: (纸本)9781728119465

Strong interferences occur in several wireless scenarios, such as full-duplex wireless communications and heterogenous networks in unlicensed spectrum. Because strong interferences can cause excessive quantization noise in the receiver's analog-to-digital converters (ADC), mitigation of strong interferences needs to be conducted not only after but before the ADCs, i.e., via hybrid processing - an actively researched topic in recent years. In this paper, we propose to use an M-input M-output analog phase shifter network (PSN) between the receiving antennas and the ADCs to prewhiten spatially the interferences (plus signal and noise). This scheme, referred to as the Hybrid Interference Mitigation using Analog Prewhitening (HIMAP), requires no information about the interferences except an estimated spatial covariance matrix. Before the ADCs, the HIMAP scheme suppresses the strong interferences through optimizing the PSN;after the ADCs, the HIMAP suppresses the residual interferences through employing minimum mean squared error (MMSE) beamforming. The simulation results verify the effectiveness of the HIMAP scheme.

关键词： interference mitigation phase shifter network ADC resolution full-duplex wireless hybrid signal processing

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Distributed Detection With A Scan Statistic: Global to Local Inference

Distributed Detection With A Scan Statistic: Global to Local...

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IEEE 7th sensor array and multichannel signal processing workshop (SAM)

作者： Song, Xiufeng Willett, Peter Glaz, Joseph Zhou, Shengli Univ Connecticut Dept Elect & Comp Engn 371 Fairfield WayU-2157 Storrs CT 06269 USA Univ Connecticut Dept Stat Storrs CT 06269 USA

ISBN: (纸本)9781467310710

sensor networks offer an opportunity for improving submarine detection. Let each sensor firstly make a binary local decision-'0' or '1', and then a fusion center collects them to make a system-level inference without knowledge of probabilities of local detection. An obvious strategy is a counting rule test, which simply counts the total number of 1's and compares it to a threshold. This approach equally considers all network subareas. However, reflected signals from a submarine are highly aspect dependent, and in many instances only sensors in a particular zone could receive the echoes. This paper focuses on the scan statistic, which slides a window across the sensor field, and selects the subarea with the largest number of 1's to make a decision. The scan statistic integrates the spatial distinction of local decisions into detection fusion. With a proper window size, it may suppress subarea interference, and improve system-level performance.

关键词： Distributed detection detection fusion scan statistic counting rule test sensor network submarine

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From academe to industry or from writing papers to making chips: Experiences and conclusions

From academe to industry or from writing papers to making ch...

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2nd IEEE sensor array and multichannel signal processing workshop

作者： Porat, B Infineon Technol N Amer Corp San Jose CA 95112 USA

ISBN: (纸本)0780375513

In recent years, the author has been involved in starting up a high-tech company and bringing to a successful fruition of both the product and the company itself In this paper, we will share our experiences from this venture with the audience. The product in question was a VDSL modem, delivering about 15 megabits-per-second over unshielded telephone wires in full duplex. We review VDSL technology, its capabilities and limitations, and put it in the context of the "broadband to the home" trend. We describe the steps involved in turning a paper-concept into a real working product, as well as the main challenges and obstacles. We discuss what may be the future of copper-based broadband technology and what may come after it. Finally, we reflect on possible implications of our industry experience on teaching digital signal processing in the future.

关键词： Digital signal processing

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Dynamic TDD Enabled Distributed Antenna array Massive MIMO System 12

Dynamic TDD Enabled Distributed Antenna Array Massive MIMO S...

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IEEE 12th sensor array and multichannel signal processing workshop (SAM)

作者： Chowdhury, Anubhab Murthy, Chandra R. Chopra, Ribhu Indian Inst Sci Dept ECE Bangalore Karnataka India Indian Inst Technol Guwahati Dept EEE Gauhati India

ISBN: (纸本)9781665406338

In this paper, we analyze the performance of dynamic time division duplexing (DTDD) in a distributed antenna array massive multiple-input multiple-output (DAA-mMIMO) system in the presence of simultaneous uplink (UL) and downlink (DL) data requirements. DTDD has been shown to substantially improve system performance in terms of spectral efficiency (SE) for cellular mMIMO systems. In the DAAenabled system, we show that the performance of DTDD depends critically on appropriately scheduling the UL/DL modes at the access points (APs) based on the localized UL/DL traffic demand. Since an exhaustive search over all possible UL/DL modes is combinatorially complex, we present a greedy algorithm to solve the AP-scheduling problem in polynomial time. Via extensive numerical experiments, we illustrate the 95%-likely sum UL-DL SE achieved by our solution, and show that DAA-mMIMO with dynamic AP-scheduling can substantially outperform TDD-based cellular as well as DAA mMIMO systems.

关键词： Distributed antenna arrays dynamic TDD distributed processing massive MIMO

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