期刊文献+
共找到23篇文章
< 1 2 >
每页显示 20 50 100
Survey of Indoor Localization Based on Deep Learning
1
作者 Khaldon Azzam Kordi Mardeni Roslee +3 位作者 Mohamad Yusoff Alias Abdulraqeb Alhammadi Athar Waseem Anwar Faizd Osman 《Computers, Materials & Continua》 SCIE EI 2024年第5期3261-3298,共38页
This study comprehensively examines the current state of deep learning (DL) usage in indoor positioning.It emphasizes the significance and efficiency of convolutional neural networks (CNNs) and recurrent neuralnetwork... This study comprehensively examines the current state of deep learning (DL) usage in indoor positioning.It emphasizes the significance and efficiency of convolutional neural networks (CNNs) and recurrent neuralnetworks (RNNs). Unlike prior studies focused on single sensor modalities like Wi-Fi or Bluetooth, this researchexplores the integration of multiple sensor modalities (e.g.,Wi-Fi, Bluetooth, Ultra-Wideband, ZigBee) to expandindoor localization methods, particularly in obstructed environments. It addresses the challenge of precise objectlocalization, introducing a novel hybrid DL approach using received signal information (RSI), Received SignalStrength (RSS), and Channel State Information (CSI) data to enhance accuracy and stability. Moreover, thestudy introduces a device-free indoor localization algorithm, offering a significant advancement with potentialobject or individual tracking applications. It recognizes the increasing importance of indoor positioning forlocation-based services. It anticipates future developments while acknowledging challenges such as multipathinterference, noise, data standardization, and scarcity of labeled data. This research contributes significantly toindoor localization technology, offering adaptability, device independence, and multifaceted DL-based solutionsfor real-world challenges and future advancements. Thus, the proposed work addresses challenges in objectlocalization precision and introduces a novel hybrid deep learning approach, contributing to advancing locationcentricservices.While deep learning-based indoor localization techniques have improved accuracy, challenges likedata noise, standardization, and availability of training data persist. However, ongoing developments are expectedto enhance indoor positioning systems to meet real-world demands. 展开更多
关键词 Deep learning indoor localization wireless-based localization
下载PDF
Joint Modulations of Electromagnetic Waves and Digital Signals on a Single Metasurface Platform to Reach Programmable Wireless Communications 被引量:2
2
作者 Xiang Wan Chaokun Xiao +10 位作者 He Huang Qiang Xiao Wei Xu Yueheng Li Joerg Eisenbeis Jiawei Wang Ziai Huang Qiang Cheng Shi Jin Thomas Zwick Tiejun Cui 《Engineering》 SCIE EI 2022年第1期86-95,共10页
In current wireless communication and electronic systems,digital signals and electromagnetic(EM)radiation are processed by different modules.Here,we propose a mechanism to fuse the modulation of digital signals and th... In current wireless communication and electronic systems,digital signals and electromagnetic(EM)radiation are processed by different modules.Here,we propose a mechanism to fuse the modulation of digital signals and the manipulation of EM radiation on a single programmable metasurface(PM).The PM consists of massive subwavelength-scale digital coding elements.A set of digital states of all elements forms simultaneous digital information roles for modulation and the wave-control sequence code of the PM.By designing digital coding sequences in the spatial and temporal domains,the digital information and farfield patterns of the PM can be programmed simultaneously and instantly in desired ways.For the experimental demonstration of the mechanism,we present a programmable wireless communication system.The same system can realize transmissions of digital information in single-channel modes with beamsteerable capability and multichannel modes with multiple independent information.The measured results show the excellent performance of the programmable system.This work provides excellent prospects for applications in fifth-or sixth-generation wireless communications and modern intelligent platforms for unmanned aircrafts and vehicles. 展开更多
关键词 Joint radar and communication Programmable metasurface Massive multiple-in and multiple-out
下载PDF
大尺度电离层行扰的GPS观测 被引量:10
3
作者 张东和 K.Igarashi +1 位作者 肖佐 马冠一 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2002年第4期453-460,共8页
利用日本境内的高空间分辨率的双频GPS台站资料 ,观测研究了发生于 2 0 0 0年 7月中旬太阳强活动期间的一次大尺度电离层行扰 .结果表明 :在 7月 1 5日 1 1 :0 0UT—1 8:0 0UT期间观测区域的电离层中出现了大尺度电离层行扰 .在 1 5 :0 ... 利用日本境内的高空间分辨率的双频GPS台站资料 ,观测研究了发生于 2 0 0 0年 7月中旬太阳强活动期间的一次大尺度电离层行扰 .结果表明 :在 7月 1 5日 1 1 :0 0UT—1 8:0 0UT期间观测区域的电离层中出现了大尺度电离层行扰 .在 1 5 :0 0UT之前 ,扰动周期为2h左右 ,在 1 5 :0 0UT以后 ,扰动周期为 1h左右 ;总电子含量扰动幅度的变化范围约为 1—2TECU ;通过对 1 5 :0 0— 1 7:0 0UT之间总电子含量扰动曲线同相位点的分析 ,发现这期间的电离层行扰的扰动速度约为 60 0— 70 0m/s,扰动波长在 2 2 0 0km左右 ,扰动传播的方向几乎沿着经线从高纬向低纬传播 .该行扰与此次强太阳活动有直接的关系 ,因其发生在 7月 1 5日的磁暴急始之前数小时 ,因此与磁暴本身没有因果关系 ,应与磁暴之前先期到达地球空间的高能质子流有关 . 展开更多
关键词 GPS 总电子含量 大尺度电离层行扰 磁暴 星下点 全球定位系统
下载PDF
Joint Resource Allocation Using Evolutionary Algorithms in Heterogeneous Mobile Cloud Computing Networks 被引量:10
4
作者 Weiwei Xia Lianfeng Shen 《China Communications》 SCIE CSCD 2018年第8期189-204,共16页
The problem of joint radio and cloud resources allocation is studied for heterogeneous mobile cloud computing networks. The objective of the proposed joint resource allocation schemes is to maximize the total utility ... The problem of joint radio and cloud resources allocation is studied for heterogeneous mobile cloud computing networks. The objective of the proposed joint resource allocation schemes is to maximize the total utility of users as well as satisfy the required quality of service(QoS) such as the end-to-end response latency experienced by each user. We formulate the problem of joint resource allocation as a combinatorial optimization problem. Three evolutionary approaches are considered to solve the problem: genetic algorithm(GA), ant colony optimization with genetic algorithm(ACO-GA), and quantum genetic algorithm(QGA). To decrease the time complexity, we propose a mapping process between the resource allocation matrix and the chromosome of GA, ACO-GA, and QGA, search the available radio and cloud resource pairs based on the resource availability matrixes for ACOGA, and encode the difference value between the allocated resources and the minimum resource requirement for QGA. Extensive simulation results show that our proposed methods greatly outperform the existing algorithms in terms of running time, the accuracy of final results, the total utility, resource utilization and the end-to-end response latency guaranteeing. 展开更多
关键词 heterogeneous mobile cloud computing networks resource allocation genetic algorithm ant colony optimization quantum genetic algorithm
下载PDF
Hybrid and Full-Digital Beamforming in mmWave Massive MIMO Systems: A Comparison Considering Low-Resolution ADCs 被引量:2
5
作者 Wence Zhang Xiaoxuan Xia +1 位作者 Yinkai Fu Xu Bao 《China Communications》 SCIE CSCD 2019年第6期91-102,共12页
In a millimeter-wave(mmWave)Massive multiple-input multiple-output(MIMO)systems,full-digital beamforming(i.e.,connecting each antenna with a specific radio-frequency(RF)chain)becomes inefficient due to the hardware co... In a millimeter-wave(mmWave)Massive multiple-input multiple-output(MIMO)systems,full-digital beamforming(i.e.,connecting each antenna with a specific radio-frequency(RF)chain)becomes inefficient due to the hardware cost and power consumption.Therefore,hybrid analog and digital transceiver where the number of RF chains are much smaller than that of the antennas has drawn great research interest.In this work,we investigate the use of low-resolution analog-to-digital converters(ADCs)in the uplink of multi-user hybrid and full-digital mmWave Massive MIMO systems.To be specific,we compare the performance of full-digital minimum mean square error(MMSE)and hybrid MMSE beamforming in both sum rates and energy efficiency.Accurate approximations of sum rates and energy efficiency are provided for both schemes,which captures the dominant factors.The analytical results show that full-digital beamforming outperforms hybrid beamforming in terms of sum rates and requires only a small portion(γ)of antennas used by hybrid beamforming to achieve the same sum rates.We given sufficient condition for full-digital beamforming to outperform hybrid beamforming in terms of energy efficiency.Moreover,an algorithm is proposed to search for the optimal ADC resolution bits.Numerical results demonstrate the correctness of the analysis. 展开更多
关键词 HYBRID MASSIVE MIMO mmWave MMSE low-resolution ADCS
下载PDF
COMBINED TRANSMIT ANTENNA SELECTION AND DETECTION OVER SPATIAL CORRELATED MIMO SYSTEMS 被引量:2
6
作者 Meng Qingmin Hua Jingyu +1 位作者 You Xiaohu Zhuang Xiangyang 《Journal of Electronics(China)》 2007年第6期732-739,共8页
In this paper a method that combines transmit antenna selection and reduced-constellation detection in spatially correlated Multi-Input Multi-Output (MIMO) fading channels is presented. To mitigate the performance d... In this paper a method that combines transmit antenna selection and reduced-constellation detection in spatially correlated Multi-Input Multi-Output (MIMO) fading channels is presented. To mitigate the performance degradation caused by the use of antenna selection that is based on correlation among columns, an iterative receiver scheme that uses only a subset of the constellation points close to the expected symbol vahle estimated in the previous iteration is proposed. The size of the subset can adapt to the maximum correlation of the sub-matrix after the simple antenna selection. Furthermore, the error rate performance of the scheme under linear Miniinutn Mean Square Error (MMSE) or Ordered Successive Interference Cancellation (OSIC) for the first run detection and different interleaver lengths is investigated while the transnlit antenna selection is considered. The simulation results show a significant advantage both for implementation complexity and for error rate performance under a fixed data rate. 展开更多
关键词 Multi-Input Multi-Output (MIMO) Antenna selection CORRELATION Reduced-complexity detection method Iterative receiver
下载PDF
A NOVEL CALL ADMISSION CONTROL SCHEME IN CELLULAR/WLAN INTEGRATION AND PERFORMANCE ANALYSIS 被引量:1
7
作者 Xia Weiwei Shen Lianfeng 《Journal of Electronics(China)》 2009年第2期168-178,共11页
In order to achieve the Quality of Service(QoS) provisioning and efficient resource utili-zation in cellular network and Wireless Local Area Network(WLAN) integration,an Integrated Ser-vice-Based Call Admission Contro... In order to achieve the Quality of Service(QoS) provisioning and efficient resource utili-zation in cellular network and Wireless Local Area Network(WLAN) integration,an Integrated Ser-vice-Based Call Admission Control(ISB-CAC) scheme is proposed in this paper.The integrated network is modeled by using multi-dimensional Markov chains.The numerical analysis is presented to evaluate the important performance measures such as the blocking probability of originating calls,the dropping probability,and the average transfer time,etc.The steady-state probabilities of the multi-dimensional Markov chains are obtained by using an iterative approach,and the CAC pa-rameters are optimally designed.The analytical model is validated by the computer simulation.It is shown that compared with the conventional WLAN-First Call Admission Control(WF-CAC) scheme,the proposed ISB-CAC scheme not only provides better QoS for mobile users but also utilizes the bandwidth resources more efficiently. 展开更多
关键词 Cellular/WLAN integration Call Admission Control(CAC) Quality of Service(QoS) Vertical handoff Markov process
下载PDF
PERFORMANCE OF THE ZERO FORCING PRECODING MIMO BROADCAST SYSTEMS WITH CHANNEL ESTIMATION ERRORS 被引量:1
8
作者 Wang Jing Liu Zhanli Wang Yan You Xiaohu 《Journal of Electronics(China)》 2007年第4期490-495,共6页
In this paper, the effect of channel estimation errors upon the Zero Forcing (ZF) precoding Multiple Input Multiple Output Broadcast (MIMO BC) systems was studied. Based on the two kinds of Gaussian estimation error m... In this paper, the effect of channel estimation errors upon the Zero Forcing (ZF) precoding Multiple Input Multiple Output Broadcast (MIMO BC) systems was studied. Based on the two kinds of Gaussian estimation error models, the performance analysis is conducted under different power allocation strategies. Analysis and simulation show that if the covariance of channel estimation errors is independent of the received Signal to Noise Ratio (SNR), imperfect channel knowledge deteriorates the sum capacity and the Bit Error Rate (BER) performance severely. However, under the situation of orthogonal training and the Minimum Mean Square Error (MMSE) channel estimation, the sum ca- pacity and BER performance are consistent with those of the perfect Channel State Information (CSI) with only a performance degradation. 展开更多
关键词 Zero Forcing (ZF) Multiple Input Multiple Output BroadCast (MIMO BC) system Channel estimation errors Sum capacity
下载PDF
RELAY ASSISTED TRANSMISSSION WITH BIT-INTERLEAVED CODED MODULATION 被引量:1
9
作者 Meng Qingmin You Xiaohu John Boyer 《Journal of Electronics(China)》 2006年第4期520-527,共8页
We investigate an adaptive cooperative protocol in a Two-Hop-Relay (THR) wireless system that combines the following: (1) adaptive relaying based on repetition coding; (2) single or two transmit antennas and one recei... We investigate an adaptive cooperative protocol in a Two-Hop-Relay (THR) wireless system that combines the following: (1) adaptive relaying based on repetition coding; (2) single or two transmit antennas and one receive antenna configurations for all nodes, each using high order constellation; (3) Bit-Interleaved Coded Modulation (BICM). We focus on a simple decoded relaying (i.e. no error correcting at a relay node) and simple signal quality thresholds for relaying. Then the impact of the two simple thresholds on the system performance is studied. Our results suggest that compared with the traditional scheme for direct transmission, the proposed scheme can increase average throughput in high spectral efficiency region with low implementa-tion-cost at the relay. 展开更多
关键词 Cooperative diversity Multihop diversity relay channel iterative decoding Alamouti coding
下载PDF
CRAMER-RAO BOUNDS OF THE FREQUENCY ESTIMATION IN THE TIME SELECTIVE RADIO CHANNELS WITH DOPPLER SPREAD 被引量:1
10
作者 Hua Jingyu Yang Xin You Xiaohu 《Journal of Electronics(China)》 2006年第2期165-171,共7页
The mobile channel is slow fading and time selective, thus the multiplicative and additive noise of the channel will smear the spectral line, or arouse Doppler spread. This spread will make the parameters estimation a... The mobile channel is slow fading and time selective, thus the multiplicative and additive noise of the channel will smear the spectral line, or arouse Doppler spread. This spread will make the parameters estimation accuracy degrade. The goal of this paper is to analytically assess this degradation when Carrier Frequency Offset (CFO) and Doppler shift exist jointly. Then the finite-sample Cramer-Rao Lower Bound (CRLB) is derived and close-form asymptotical expression is given for large-sample CRLB. These expressions give insights into the performance room for frequency estimation. Also the variance of Doppler shift estimator is simulated to illustrate the theoretical results. 展开更多
关键词 Cramer-Rao Lower Bound (CRLB) Time selective channel Doppler-shift
下载PDF
HIGH SNR SUM CAPACITY ANALYSIS OF BD MIMO BC SYSTEMS WITH IMPERFECT CSI
11
作者 Wang Jing Liu Zhanli Wang Yan You Xiaohu 《Journal of Electronics(China)》 2009年第2期145-151,共7页
We investigate the sum capacity of Block Diagonalization precoding Multiple Input Mul-tiple Output Broadcast Channels(BD MIMO BC) with imperfect Channel State Information(CSI) at the base station.Since it is difficult... We investigate the sum capacity of Block Diagonalization precoding Multiple Input Mul-tiple Output Broadcast Channels(BD MIMO BC) with imperfect Channel State Information(CSI) at the base station.Since it is difficult to obtain the exact expression,a lower and an upper bounds of the sum capacity under Gaussian channel estimation errors are drived instead.Analyses show that the gap between two bounds is considerably tight at all Signal to Noise Ratio(SNR) region.From the lower bound of the sum capacity,we can see that the multiplexing gain tends to be zero at high SNR region,which indicates that the BD MIMO BC system with channel estimation errors is interference-limited at high SNR. 展开更多
关键词 Block Diagonalization(BD) Multiple Input Multiple Output Broadcast Channels(MIMO BC) Imperfect Channel State Information(CSI) Sum capacity Multiplexing gain
下载PDF
A CODE DESIGN CRITERIA FOR NOT FULLY CONNECTED CHANNEL
12
作者 Xiao Haiyong Bi Guangguo Zhang Peng Jin Xiufeng 《Journal of Electronics(China)》 2006年第2期193-196,共4页
There are parallel channels which are not fully connected in practice, such as Frequency Division Multiplex (FDM or Orthogonal FDM) systems. Conventional space-time codes can be used for such parallel channels but not... There are parallel channels which are not fully connected in practice, such as Frequency Division Multiplex (FDM or Orthogonal FDM) systems. Conventional space-time codes can be used for such parallel channels but not the optimal. Based on the derivation of PEP expression for codes transmitted on parallel block fading channels, criteria of codes design for not fully connected channels are proposed and are compared with Tarokh's criteria for fully connected channel. New codes for such channels are provided by systematical and exhaustive search. Simulation results show that these codes offer better performance on parallel FDM channels than other known codes. 展开更多
关键词 Block fading channel Parallel channel Space-time codes Orthogonal Frequency Division Multiplex (OFDM) DIVERSITY
下载PDF
Clustering Approaches for Overhead Reduction over Coordinated Multiple Points Network-MIMO Downlink Systems
13
作者 Xiao Shanghui Zhang Zhongpei Shi Zhiping 《China Communications》 SCIE CSCD 2010年第5期103-111,共9页
Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lo... Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lot of attention. In this paper, the system structure and mathematical signal model based on clustered structure are presented for multipoint coordinating downlink transmission, the clustered supercell configurations with static/dynamic approaches are discussed, and then optimal precod- ing design is provided for an accepted level of scheduling complexity and reduced signaling over- head. Some simulation results are given to evaluate the performance of different cell-clustering approaches, and to show that a clustered supercell size of 7 is a reasonable choice for clustered coordination with the given transmit power and the reduced feedback. 展开更多
关键词 overhead reduction clustering approa-ches SUPERCELL MIMO ss STEMS cooperative com-munication
下载PDF
REGULAR LOW-DENSITY PARITY-CHECK CODES BASED ON SHIFTED IDENTITY MATRICES
14
作者 He Shanbao Zhao Chunming Jiang Ming 《Journal of Electronics(China)》 2006年第1期20-22,共3页
This paper extends the class of Low-Density Parity-Check (LDPC) codes that can be constructed from shifted identity matrices. To construct regular LDPC codes, a new method is proposed. Two simple inequations are adopt... This paper extends the class of Low-Density Parity-Check (LDPC) codes that can be constructed from shifted identity matrices. To construct regular LDPC codes, a new method is proposed. Two simple inequations are adopted to avoid the short cycles in Tanner graph, which makes the girth of Tanner graphs at least 8. Because their parity-check matrices are made up of circulant matrices, the new codes are quasi-cyclic codes. They perform well with iterative decoding. 展开更多
关键词 Low-Density Parity-Check (LDPC) codes Quasi-cyclic codes Construction of codes Sumproduct decoding
下载PDF
A CLASS OF LDPC CODE'S CONSTRUCTION BASED ON AN ITERATIVE RANDOM METHOD
15
作者 Huang Zhonghu Shen Lianfeng 《Journal of Electronics(China)》 2006年第1期124-127,共4页
This letter gives a random construction for Low Density Parity Check (LDPC) codes, which uses an iterative algorithm to avoid short cycles in the Tanner graph. The construction method has great flexible choice in LDPC... This letter gives a random construction for Low Density Parity Check (LDPC) codes, which uses an iterative algorithm to avoid short cycles in the Tanner graph. The construction method has great flexible choice in LDPC code's parameters including codelength, code rate, the least girth of the graph, the weight of column and row in the parity check matrix. The method can be applied to the irregular LDPC codes and strict regular LDPC codes. Systemic codes have many applications in digital communication, so this letter proposes a construction of the generator matrix of systemic LDPC codes from the parity check matrix. Simulations show that the method performs well with iterative decoding. 展开更多
关键词 Low Density Parity Check (LDPC) codes Sum Product Algorithm(SPA) Random construction Algebraic construction Parity check matrix Generator matrix
下载PDF
AN ITERATIVE RELIABILITY-BASED DECODING FOR LDPC CODED MODULATION SYSTEM
16
作者 Huang Ping Zhao Chunming Jiang Ming 《Journal of Electronics(China)》 2008年第3期289-293,共5页
In this paper, A Belief Propagation concatenated Orderd-Statistic Decoder (BP-OSD) based on accumulated Log-Likelihood Ratio (LLR) is proposed for medium and short lengths Low Density Parity-Check (LDPC) codes coded B... In this paper, A Belief Propagation concatenated Orderd-Statistic Decoder (BP-OSD) based on accumulated Log-Likelihood Ratio (LLR) is proposed for medium and short lengths Low Density Parity-Check (LDPC) codes coded Bit-Interleaved Coded Modulation (BICM) systems. The accumulated soft output values delivered by every BP iteration are used as reliability values of Soft-Input Soft-Output OSD (SISO-OSD) decoder and the soft output of SISO-OSD is used as a priori probabilities of the demodulator for the next iteration. Simulation results show that this improved algorithm achieves noticeable performance gain with only modest increase in computation complexity. 展开更多
关键词 Low-Density Parity-Check (LDPC) codes Bit-Interleaved Coded Modulation (BICM) Belief Propagation (BP) Soft-Input Soft-Output Ordered Statistics Decoding (SISO-OSD) Log- Likelihood Ratio (LLR)
下载PDF
Secure Mobile Crowdsensing Based on Deep Learning
17
作者 Liang Xiao Donghua Jiang +3 位作者 Dongjin Xu Wei Su Ning An Dongming Wang 《China Communications》 SCIE CSCD 2018年第10期1-11,共11页
To improve the quality of multimedia services and stimulate secure sensing in Internet of Things applications, such as healthcare and traffic monitoring, mobile crowdsensing(MCS) systems must address security threats ... To improve the quality of multimedia services and stimulate secure sensing in Internet of Things applications, such as healthcare and traffic monitoring, mobile crowdsensing(MCS) systems must address security threats such as jamming, spoofing and faked sensing attacks during both sensing and information exchange processes in large-scale dynamic and heterogeneous networks. In this article, we investigate secure mobile crowdsensing and present ways to use deep learning(DL) methods, such as stacked autoencoder, deep neural networks, convolutional neural networks, and deep reinforcement learning, to improve approaches to MCS security, including authentication, privacy protection, faked sensing countermeasures, intrusion detection and anti-jamming transmissions in MCS. We discuss the performance gain of these DLbased approaches compared to traditional security schemes and identify the challenges that must be addressed to implement these approaches in practical MCS systems. 展开更多
关键词 mobile crowdsensing SECURITY deep learning reinforcement learning faked sensing
下载PDF
PERFORMANCE OF LDPC CODED FMT SYSTEMS OVER FREQUENCY SELECTIVE FADING CHANNEL
18
作者 Li Qiang Bi Guangguo Du Peng 《Journal of Electronics(China)》 2005年第6期575-580,共6页
This paper proposes the Low Density Parity Check (LDPC) coded Filtered MultiTone (FMT) systems with high-order modulation for the high data rate reliable transmission over frequency selective fading channel. For the p... This paper proposes the Low Density Parity Check (LDPC) coded Filtered MultiTone (FMT) systems with high-order modulation for the high data rate reliable transmission over frequency selective fading channel. For the purpose of accomplishing soft input soft output iterative decoding of LDPC codes, a new soft decision metric generation method is proposed,which obviates the need of the noise variance estimation, for M-PSK/M-QAM-type high-order modulation over frequency selective fading channel. Computer simulation indicates that, there is no performance loss with our new metric, but the complexity of implementation is reduced, and that the LDPC codes are effective to improve the Bit Error Rate (BER) of FMT in frequency selective fading channel. 展开更多
关键词 Low Density Parity Check (LDPC) code Filtered MultiTone (FMT) Frequency-selective fading channel
下载PDF
CORRELATED INTERFERENCE CANCELLATION FOR IR-UWB
19
作者 Zhang Zaichen Yu Xutao Bi Guangguo 《Journal of Electronics(China)》 2008年第5期685-688,共4页
In this letter,we propose a hybrid analog/digital detection algorithm,the Correlated In-terference Cancellation(CIC) algorithm,for Impulse Radio Ultra-WideBand(IR-UWB) system.The CIC algorithm correlates received sign... In this letter,we propose a hybrid analog/digital detection algorithm,the Correlated In-terference Cancellation(CIC) algorithm,for Impulse Radio Ultra-WideBand(IR-UWB) system.The CIC algorithm correlates received signal with its delayed versions in the analog domain and samples the correlation output at the symbol rate.The symbol rate samples are processed in the digital domain to perform interference cancellation.Therefore,CIC works for high data rate systems with heavy In-terSymbol Interference(ISI).Simulation results show that CIC achieves good performance in typical UWB channels. 展开更多
关键词 Impulse Radio Ultra-WideBand (IR-UWB) Correlated Interference Cancellation (CIC) RECEIVER
下载PDF
Multichannel direct transmissions of nearfield information 被引量:11
20
作者 Xiang Wan Qian Zhang +6 位作者 Tian Yi Chen Lei Zhang Wei Xu He Huang Chao Kun Xiao Qiang Xiao Tie Jun Cui 《Light(Science & Applications)》 SCIE EI CAS CSCD 2019年第1期643-650,共8页
A digital-coding programmable metasurface(DCPM)is a type of functional system that is composed of subwavelength-scale digital coding elements with opposite phase responses.By configuring the digital coding elements,a ... A digital-coding programmable metasurface(DCPM)is a type of functional system that is composed of subwavelength-scale digital coding elements with opposite phase responses.By configuring the digital coding elements,a DCPM can construct dynamic near-field image patterns in which the intensity of each pixel of the image can be dynamically and independently modulated.Thus,a DCPM can perform both spatial and temporal modulations.Here,this advantage is used to realize multichannel direct transmissions of near-field information.Three points are selected in the near-field region to form three independent channels.By applying various digital phase codes on the DCPM,independent binary digital symbols defined by amplitude codes(namely,weak and strong amplitudes)are transmitted through the three channels.The measured near-field distributions and temporal transmissions of the system agree with numerical calculations.Compared with the conventional multichannel transmission,the proposed mechanism achieves simultaneous spatial and temporal modulations by treating DCPM as an energy radiator and information modulator,thereby enduing DCPM with high potential in near-field information processing and communications. 展开更多
关键词 FIELD SYSTEM thereby
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部