Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580258
Nianshi Li, Kun Qian, Fengyuan Ren
Because of the advantages of high bandwidth, low cost, and architecture openness, Ethernet is increasingly used in the industrial Internet to support both time-critical services and conventional communication services on a unified network infrastructure. The biggest challenge right now is to provide low and deterministic latency for time-critical services. Preemption is an effective way to achieve deterministic and low latency. However, the current preemption mechanism has no specific hardware implementation, nor does it describe the restoration after preemption. In this paper, we implement preemption mechanism in hardware and propose two preemption restoration mechanisms: Preemption Restart and Preemption Resume, they are suitable for different scenarios. We also discussed all the details implemented on common commercial switch architectures. Finally, we implement preemption restoration and verify our design in the actual vehicle network topology. Through experiments, we verify the necessity of the preemption mechanism and evaluate the impact of preemption restoration on non-time-critical services.
{"title":"Enhanced Switch Design Supporting Dual Preemption Under Real-Time Ethernet","authors":"Nianshi Li, Kun Qian, Fengyuan Ren","doi":"10.1109/iccc52777.2021.9580258","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580258","url":null,"abstract":"Because of the advantages of high bandwidth, low cost, and architecture openness, Ethernet is increasingly used in the industrial Internet to support both time-critical services and conventional communication services on a unified network infrastructure. The biggest challenge right now is to provide low and deterministic latency for time-critical services. Preemption is an effective way to achieve deterministic and low latency. However, the current preemption mechanism has no specific hardware implementation, nor does it describe the restoration after preemption. In this paper, we implement preemption mechanism in hardware and propose two preemption restoration mechanisms: Preemption Restart and Preemption Resume, they are suitable for different scenarios. We also discussed all the details implemented on common commercial switch architectures. Finally, we implement preemption restoration and verify our design in the actual vehicle network topology. Through experiments, we verify the necessity of the preemption mechanism and evaluate the impact of preemption restoration on non-time-critical services.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114675707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580224
Lihua Qiao, Zhen Gao, Chen He, Zhenyu Xiao, Dezhi Zheng, Jun Zhang
The grant-free non-coherent index-modulation (NC-IM) has been recently emerging as an efficient embedded information transmission scheme for massive machine-type communications without channel state information, especially for cost-efficient Internet-of- Things (IoT) devices with small data packets. In this paper, we combine the grant-free NC-IM with OFDM for overcoming frequency-selective channel fading. Specifically, each device is allocated with a unique signature sequence codebook and active device transmits one of its signature sequences in each subcarrier. Information is embedded in the index of the transmitted signature sequence. By exploiting the structured sparsity of the equivalent channel matrix in the spatial domain and the common device activity in the subcarrier domain, we propose an efficient space-frequency joint activity and blind information detection algorithm with significantly improved device activity and embedded information detection performance. Simulation results verify the superiority of the proposed algorithm over state-of-the-art algorithms.
{"title":"Non-Coherent Grant-Free Massive IoT Access for mMTC: An Index Modulation Perspective","authors":"Lihua Qiao, Zhen Gao, Chen He, Zhenyu Xiao, Dezhi Zheng, Jun Zhang","doi":"10.1109/iccc52777.2021.9580224","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580224","url":null,"abstract":"The grant-free non-coherent index-modulation (NC-IM) has been recently emerging as an efficient embedded information transmission scheme for massive machine-type communications without channel state information, especially for cost-efficient Internet-of- Things (IoT) devices with small data packets. In this paper, we combine the grant-free NC-IM with OFDM for overcoming frequency-selective channel fading. Specifically, each device is allocated with a unique signature sequence codebook and active device transmits one of its signature sequences in each subcarrier. Information is embedded in the index of the transmitted signature sequence. By exploiting the structured sparsity of the equivalent channel matrix in the spatial domain and the common device activity in the subcarrier domain, we propose an efficient space-frequency joint activity and blind information detection algorithm with significantly improved device activity and embedded information detection performance. Simulation results verify the superiority of the proposed algorithm over state-of-the-art algorithms.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127142227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580404
Guixun Huang, Lin Zhang, Yan Feng
Orbital angular momentum (OAM) multiplexing can improve the transmission efficiency and provide higher bandwidth for underwater wireless optical communication (UWOC). However, the turbulence effect in ocean would induce the crosstalk between OAM modes, thereby leading to the reliability performance degradations. In this paper, we first utilize the mode modulation in the underwater OAM multiplexing system to deliver extra information bits. Then we add a zero-forcing (ZF) based precoder at the transmitter to mitigate the crosstalk effects to enhance the reliability performances. At the receiver, we propose a two-step maximum likelihood (TSML) detector which has lower complexity than that of the ML detection to recover the transmitted symbols. Moreover, we derive the bit error rate (BER) expressions for the proposed systems operating under perfect or imperfect channel state information (CSI) conditions, and the simulation results validate the theoretical analysis. Last but not the least, the simulated performances of the proposed system under different underwater channel parameters, e.g. the dissipation rate of temperature, the relative strength of temperature and salinity fluctuations and turbulence strengths are investigated and analyzed.
{"title":"A Zero-Forcing Precoder and Mode Modulation Aided Orbital Angular Momentum Multiplexing Transceiver for Underwater Transmissions","authors":"Guixun Huang, Lin Zhang, Yan Feng","doi":"10.1109/iccc52777.2021.9580404","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580404","url":null,"abstract":"Orbital angular momentum (OAM) multiplexing can improve the transmission efficiency and provide higher bandwidth for underwater wireless optical communication (UWOC). However, the turbulence effect in ocean would induce the crosstalk between OAM modes, thereby leading to the reliability performance degradations. In this paper, we first utilize the mode modulation in the underwater OAM multiplexing system to deliver extra information bits. Then we add a zero-forcing (ZF) based precoder at the transmitter to mitigate the crosstalk effects to enhance the reliability performances. At the receiver, we propose a two-step maximum likelihood (TSML) detector which has lower complexity than that of the ML detection to recover the transmitted symbols. Moreover, we derive the bit error rate (BER) expressions for the proposed systems operating under perfect or imperfect channel state information (CSI) conditions, and the simulation results validate the theoretical analysis. Last but not the least, the simulated performances of the proposed system under different underwater channel parameters, e.g. the dissipation rate of temperature, the relative strength of temperature and salinity fluctuations and turbulence strengths are investigated and analyzed.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127292312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580205
Luoyu Gao, Siye Wang, Zixuan Guan, Wenbo Xu
The usage of unmanned aerial vehicles (UAVs) as aerial base station (BS) or relay are becoming increasingly important in the yield of wireless communications. An UAV-based relay can greatly support the transmission between the mobile ground user (MGU) and the base station. In this paper, we study the optimum altitude of a decode-and-forward (DF) relaying UAV system. In particular, we analyze two different communication scenarios, i.e., BS-UAV-MGU (BUM) and MGU-UAV-MGU (MUM) scenarios, respectively. For the BUM scenario, the optimum altitude of UAV-based relay over Mixed-Rayleigh fading channel is studied. For the MUM scenario, we analyze the performance of a two-hop network over the Double-Rayleigh fading channel with the assistance of a DF relay. Moreover, the average end-to-end bit error rate (BER) and outage probability of the proposed UAV-relay system are analyzed for both BUM and MUM scenarios. Additionally, we provide closed-form expressions of outage probability and BER for BPSK modulation and demonstrate the accuracy of proposed expressions via Monte-Carlo simulations.
{"title":"Optimum Deployment of UAV Relaying with Mobile Ground User System","authors":"Luoyu Gao, Siye Wang, Zixuan Guan, Wenbo Xu","doi":"10.1109/iccc52777.2021.9580205","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580205","url":null,"abstract":"The usage of unmanned aerial vehicles (UAVs) as aerial base station (BS) or relay are becoming increasingly important in the yield of wireless communications. An UAV-based relay can greatly support the transmission between the mobile ground user (MGU) and the base station. In this paper, we study the optimum altitude of a decode-and-forward (DF) relaying UAV system. In particular, we analyze two different communication scenarios, i.e., BS-UAV-MGU (BUM) and MGU-UAV-MGU (MUM) scenarios, respectively. For the BUM scenario, the optimum altitude of UAV-based relay over Mixed-Rayleigh fading channel is studied. For the MUM scenario, we analyze the performance of a two-hop network over the Double-Rayleigh fading channel with the assistance of a DF relay. Moreover, the average end-to-end bit error rate (BER) and outage probability of the proposed UAV-relay system are analyzed for both BUM and MUM scenarios. Additionally, we provide closed-form expressions of outage probability and BER for BPSK modulation and demonstrate the accuracy of proposed expressions via Monte-Carlo simulations.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125061292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580323
Zelin Zhu, Mengru Wu, Weijing Qi, Qingyang Song, Lei Guo
Filtered-orthogonal frequency division multiplexing (F -OFDM) is a competitive candidate waveform for the fifth generation (5G) wireless communication systems due to its huge flexibility and high spectrum efficiency. Yet, F-OFDM inevitably brings the problem of high peak-to-average-power ratio (PAPR), not only reducing the efficiency of power amplifiers (PA), but also increasing the possibility of signal distortion. In this paper, to solve the high PAPR problem in F-OFDM systems, we propose a new hybrid PAPR reduction approach combining the traditional selected mapping (SLM) and iterative clipping and filtering (ICF) methods appropriately. First, SLM is used to decrease the probability that high PAPR values occur for separate subband signals. Then, we exploit I CF to perform clipping and filtering operations to reduce PAPR of the composite signal from the three subbands. Finally, we carry out simulations and results show that the proposed approach achieves lower PAPR than individual SLM and ICF methods, while there is almost no increase in bit error rate (BER) and system complexity.
{"title":"PAPR Reduction in F-OFDM systems combining SLM and ICF","authors":"Zelin Zhu, Mengru Wu, Weijing Qi, Qingyang Song, Lei Guo","doi":"10.1109/iccc52777.2021.9580323","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580323","url":null,"abstract":"Filtered-orthogonal frequency division multiplexing (F -OFDM) is a competitive candidate waveform for the fifth generation (5G) wireless communication systems due to its huge flexibility and high spectrum efficiency. Yet, F-OFDM inevitably brings the problem of high peak-to-average-power ratio (PAPR), not only reducing the efficiency of power amplifiers (PA), but also increasing the possibility of signal distortion. In this paper, to solve the high PAPR problem in F-OFDM systems, we propose a new hybrid PAPR reduction approach combining the traditional selected mapping (SLM) and iterative clipping and filtering (ICF) methods appropriately. First, SLM is used to decrease the probability that high PAPR values occur for separate subband signals. Then, we exploit I CF to perform clipping and filtering operations to reduce PAPR of the composite signal from the three subbands. Finally, we carry out simulations and results show that the proposed approach achieves lower PAPR than individual SLM and ICF methods, while there is almost no increase in bit error rate (BER) and system complexity.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125785051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580426
Ziyi Wang, Xin Su, Yuanxue Xin
As an important part of the future maritime information intelligent network, the maritime observation monitoring sensor network can provide a variety of observation and monitoring applications. Multi-access edge computing (MAEC) can effectively guarantee a low-delay and high-reliability data transmission for maritime observation monitoring sensor networks and supply various related maritime applications. In this paper, a multi-access edge computing offloading method for offshore scenarios is proposed. A multi-user multi-hop unicast (MMU) offloading model is established for the limited resources of edge computing. Orthogonal frequency division multiple access (OFDMA) technology is used to alleviate the congestion of data unloading. At the same time, the pending tasks have a non-negligible queuing delay on some offloading nodes. In addition, the mixed integer nonlinear optimization problem is separated and the transmission power is effectively allocated by using sub-optimal method. The offloading decision is made by improving the traditional artificial fish swarm algorithm (AFSA). Simulation results show that, the proposed algorithm has a faster convergence speed and can reduce the network delay by nearly 19% comparing with the traditional scheme.
{"title":"Multi-access Edge Computing Offloading Method Oriented to Offshore Scenarios","authors":"Ziyi Wang, Xin Su, Yuanxue Xin","doi":"10.1109/iccc52777.2021.9580426","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580426","url":null,"abstract":"As an important part of the future maritime information intelligent network, the maritime observation monitoring sensor network can provide a variety of observation and monitoring applications. Multi-access edge computing (MAEC) can effectively guarantee a low-delay and high-reliability data transmission for maritime observation monitoring sensor networks and supply various related maritime applications. In this paper, a multi-access edge computing offloading method for offshore scenarios is proposed. A multi-user multi-hop unicast (MMU) offloading model is established for the limited resources of edge computing. Orthogonal frequency division multiple access (OFDMA) technology is used to alleviate the congestion of data unloading. At the same time, the pending tasks have a non-negligible queuing delay on some offloading nodes. In addition, the mixed integer nonlinear optimization problem is separated and the transmission power is effectively allocated by using sub-optimal method. The offloading decision is made by improving the traditional artificial fish swarm algorithm (AFSA). Simulation results show that, the proposed algorithm has a faster convergence speed and can reduce the network delay by nearly 19% comparing with the traditional scheme.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126106093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580359
Siqi Liu, Tianyu Wang, Shaowei Wang
Due to the technical and cost limitations, wireless systems suffer from various hardware impairments, including phase noise, power amplifier nonlinearity, carrier frequency offset and in-phase and quadrature-phase imbalance. These impairments can highly degrade the physical layer performance and are usually compensated separately by using model-based signal processing techniques. However, due to the high carrier frequency and large bandwidth of 5G new radio, the coupling effects between different impairments are highly aggravated, which greatly degrades the performance of individual compensation modules for different impairments. In this paper, we propose a deep learning-based method, which jointly addresses the hardware impairments directly from the received data. Specifically, we focus on carrier frequency offset and in-phase and quadrature-phase imbalance, and propose a deep neural network with multiple parallel subnets for joint compensation. Numerical results show that the proposed method outperforms the conventional method using separate compensation modules in practical signal-to-noise ratio regions, and the performance improvement further increases when the cyclic prefix length or the pilot length is limited.
{"title":"Joint Compensation of CFO and IQ Imbalance in OFDM Receiver: A Deep Learning Based Approach","authors":"Siqi Liu, Tianyu Wang, Shaowei Wang","doi":"10.1109/iccc52777.2021.9580359","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580359","url":null,"abstract":"Due to the technical and cost limitations, wireless systems suffer from various hardware impairments, including phase noise, power amplifier nonlinearity, carrier frequency offset and in-phase and quadrature-phase imbalance. These impairments can highly degrade the physical layer performance and are usually compensated separately by using model-based signal processing techniques. However, due to the high carrier frequency and large bandwidth of 5G new radio, the coupling effects between different impairments are highly aggravated, which greatly degrades the performance of individual compensation modules for different impairments. In this paper, we propose a deep learning-based method, which jointly addresses the hardware impairments directly from the received data. Specifically, we focus on carrier frequency offset and in-phase and quadrature-phase imbalance, and propose a deep neural network with multiple parallel subnets for joint compensation. Numerical results show that the proposed method outperforms the conventional method using separate compensation modules in practical signal-to-noise ratio regions, and the performance improvement further increases when the cyclic prefix length or the pilot length is limited.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115545512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580395
Renzhi Yuan, Zhifeng Wang, M. Peng
The optical receiver based on non-mode-selective photonic lantern (NMS-PL) can be used to improve the communication performance of free-space optical communication (FSOC) systems, because the NMS-PL receiver can take advantages of the high coupling efficiency of multimode fiber (MMF) receivers and the high mixing efficiency of single-mode fiber (SMF) receivers. However, previous studies on the NMS-PL receiver did not consider the impact of the number of SMF cores of the NMS-PL on the bit-error rate (BER) performance under different power distributions of the NMS- PL. In this paper, we study the BER of the NMS-PL receiver using equal-gain combining (EGC) for FSOC systems under a log-normal turbulent fading channel with pointing errors. We derive both a lower bound and an approximated upper bound of the BER of the NMS-PL receiver using EGC. Numerical results show that the BER of NMS-PL receiver attains its minimum value when the number of SMF cores equals the number of guided modes of NMS-PL. Besides, numerical results also show that the power distribution of the NMS-PL has only limited influence on the BER of NMS-PL receiver using EGC when either strong turbulence or large pointing error is considered.
{"title":"Free-Space Optical Communication System Using Non-mode-Selective Photonic Lantern Based Receiver With Different Number of Single-Mode Fiber Cores","authors":"Renzhi Yuan, Zhifeng Wang, M. Peng","doi":"10.1109/iccc52777.2021.9580395","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580395","url":null,"abstract":"The optical receiver based on non-mode-selective photonic lantern (NMS-PL) can be used to improve the communication performance of free-space optical communication (FSOC) systems, because the NMS-PL receiver can take advantages of the high coupling efficiency of multimode fiber (MMF) receivers and the high mixing efficiency of single-mode fiber (SMF) receivers. However, previous studies on the NMS-PL receiver did not consider the impact of the number of SMF cores of the NMS-PL on the bit-error rate (BER) performance under different power distributions of the NMS- PL. In this paper, we study the BER of the NMS-PL receiver using equal-gain combining (EGC) for FSOC systems under a log-normal turbulent fading channel with pointing errors. We derive both a lower bound and an approximated upper bound of the BER of the NMS-PL receiver using EGC. Numerical results show that the BER of NMS-PL receiver attains its minimum value when the number of SMF cores equals the number of guided modes of NMS-PL. Besides, numerical results also show that the power distribution of the NMS-PL has only limited influence on the BER of NMS-PL receiver using EGC when either strong turbulence or large pointing error is considered.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122604152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580311
Yuanhao Xu, Ying Guo, Cheng Li, Bin Xia, Zhiyong Chen
Beam alignment is a critical issue for millimeter wave (mmWave) communication in high-mobility vehicular scenarios. In order to enhance the beam alignment performance, in this article, we investigate a dual-functional radar-communication system where the intelligent vehicle can actively cooperate with the roadside stations by sharing its sensing results. Based on the state evolution model of the vehicle, an Extended Kalman filter for beam tracking is employed. It is shown that, with the radar reflections as well as the sensing results from the vehicle, the proposed scheme can track the mobility of the vehicle and predict the beam directions more accurately, which can benefit the communication. The cooperative sensing between the vehicle and the roadside stations can be used to predict beam directions with low overhead for vehicles in complex scenarios, such as curves or crossovers. Simulations demonstrate that the proposed scheme achieves better beam tracking performance compared to the conventional pilot-based ones.
{"title":"Predictive Beam Tracking with Cooperative Sensing for Vehicle-to-Infrastructure Communications","authors":"Yuanhao Xu, Ying Guo, Cheng Li, Bin Xia, Zhiyong Chen","doi":"10.1109/iccc52777.2021.9580311","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580311","url":null,"abstract":"Beam alignment is a critical issue for millimeter wave (mmWave) communication in high-mobility vehicular scenarios. In order to enhance the beam alignment performance, in this article, we investigate a dual-functional radar-communication system where the intelligent vehicle can actively cooperate with the roadside stations by sharing its sensing results. Based on the state evolution model of the vehicle, an Extended Kalman filter for beam tracking is employed. It is shown that, with the radar reflections as well as the sensing results from the vehicle, the proposed scheme can track the mobility of the vehicle and predict the beam directions more accurately, which can benefit the communication. The cooperative sensing between the vehicle and the roadside stations can be used to predict beam directions with low overhead for vehicles in complex scenarios, such as curves or crossovers. Simulations demonstrate that the proposed scheme achieves better beam tracking performance compared to the conventional pilot-based ones.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114247933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-28DOI: 10.1109/iccc52777.2021.9580305
Chengyang Li, Yang Yang, Lin Bai, Bei Yu, Caili Guo, Hailun Xia
In this paper, a camera assisted received signal strength (CA-RSS) algorithm is proposed for visible light positioning (VLP) systems. The basic idea of CA-RSS is to simultaneously utilize visual and strength information of visible lights to achieve accurate positioning at low cost. With rectangular LED layout, the irradiance angles of the visible lights can be estimated regardless of the orientations of the LEDs. Based on the estimated irradiance angles, the distances between the LEDs and the receiver are obtained. Then, the two-dimensional (2D) position of the receiver can be calculated at low cost using a linear least square method. Based on the solid geometry theory, we further propose an independent solution method for three-dimensional (3D) positioning, which can avoid error propagation issue of dependent solution method. Moreover, considering the imperfect channel model in practice, we propose a calibration method of Lambertian model for practical uses. Simulation results show that the proposed approach can achieve 80th percentile accuracies of less than 10 cm for 3D positioning regardless of the orientations of the LEDs and the receiver. In addition, experimental results show that the proposed algorithm achieves an average 3D positioning error of 4.48 cm in a 70 cm × 70 cm × 140 cm space.
本文提出了一种用于可见光定位系统的相机辅助接收信号强度(CA-RSS)算法。CA-RSS的基本思想是同时利用可见光的视觉和强度信息，以低成本实现精确定位。矩形LED布局时，无论LED的方向如何，都可以估计出可见光的辐照角。根据估计的辐照角，得到了led与接收机之间的距离。然后，利用线性最小二乘法可以低成本地计算出接收机的二维位置。在立体几何理论的基础上，进一步提出了三维定位的独立求解方法，避免了依赖求解方法的误差传播问题。此外，针对实际中存在的不完全信道模型，提出了一种实用的朗伯模型标定方法。仿真结果表明，无论led和接收器的方向如何，该方法都可以实现小于10 cm的80百分位精度。此外，实验结果表明，该算法在70 cm × 70 cm × 140 cm空间内的平均三维定位误差为4.48 cm。
{"title":"Camera Assisted Received Signal Strength Algorithm for Indoor Visible Light Positioning","authors":"Chengyang Li, Yang Yang, Lin Bai, Bei Yu, Caili Guo, Hailun Xia","doi":"10.1109/iccc52777.2021.9580305","DOIUrl":"https://doi.org/10.1109/iccc52777.2021.9580305","url":null,"abstract":"In this paper, a camera assisted received signal strength (CA-RSS) algorithm is proposed for visible light positioning (VLP) systems. The basic idea of CA-RSS is to simultaneously utilize visual and strength information of visible lights to achieve accurate positioning at low cost. With rectangular LED layout, the irradiance angles of the visible lights can be estimated regardless of the orientations of the LEDs. Based on the estimated irradiance angles, the distances between the LEDs and the receiver are obtained. Then, the two-dimensional (2D) position of the receiver can be calculated at low cost using a linear least square method. Based on the solid geometry theory, we further propose an independent solution method for three-dimensional (3D) positioning, which can avoid error propagation issue of dependent solution method. Moreover, considering the imperfect channel model in practice, we propose a calibration method of Lambertian model for practical uses. Simulation results show that the proposed approach can achieve 80th percentile accuracies of less than 10 cm for 3D positioning regardless of the orientations of the LEDs and the receiver. In addition, experimental results show that the proposed algorithm achieves an average 3D positioning error of 4.48 cm in a 70 cm × 70 cm × 140 cm space.","PeriodicalId":425118,"journal":{"name":"2021 IEEE/CIC International Conference on Communications in China (ICCC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121840025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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