Pub Date : 2019-09-01DOI: 10.1109/VTCFall.2019.8891087
Oliver Ploder, O. Lang, T. Paireder, M. Huemer
The limited transmitter-to-receiver stop-band isolation of the duplexers in long term evolution and 5G frequency division duplex transceivers induces leakage signals from the transmitter(s) (Tx) into the receiver(s) (Rx). These leakage signals are the root cause of a multitude of self- interference (SI) problems in the receiver path(s) diminishing a receiver's sensitivity. This work deals with second-order intermodulation distortion, arising from the Tx leakage signal in combination with a coupling between the RF- and local oscillator-ports of the Rx IQ-mixer. We propose a novel adaptive architecture, utilizing neural networks, to cancel this type of interference. In contrast to traditional adaptive filter solutions, the proposed architecture can be used even if there is no model of the system available, making it robust against modeling noise and flexible in terms of interferences that it is able to cancel. The proposed architecture outperforms existing work based on least mean squares (LMS) algorithms and converges as fast as recursive least squares algorithms while maintaining comparably low complexity as the LMS approach.
{"title":"An Adaptive Machine Learning Based Approach for the Cancellation of Second-Order-Intermodulation Distortions in 4G/5G Transceivers","authors":"Oliver Ploder, O. Lang, T. Paireder, M. Huemer","doi":"10.1109/VTCFall.2019.8891087","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891087","url":null,"abstract":"The limited transmitter-to-receiver stop-band isolation of the duplexers in long term evolution and 5G frequency division duplex transceivers induces leakage signals from the transmitter(s) (Tx) into the receiver(s) (Rx). These leakage signals are the root cause of a multitude of self- interference (SI) problems in the receiver path(s) diminishing a receiver's sensitivity. This work deals with second-order intermodulation distortion, arising from the Tx leakage signal in combination with a coupling between the RF- and local oscillator-ports of the Rx IQ-mixer. We propose a novel adaptive architecture, utilizing neural networks, to cancel this type of interference. In contrast to traditional adaptive filter solutions, the proposed architecture can be used even if there is no model of the system available, making it robust against modeling noise and flexible in terms of interferences that it is able to cancel. The proposed architecture outperforms existing work based on least mean squares (LMS) algorithms and converges as fast as recursive least squares algorithms while maintaining comparably low complexity as the LMS approach.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86274797","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891304
Jeongho Yeo, J. Bang, Hyoungju Ji, Younsun Kim, Juho Lee
This paper studies a hybrid automatic repeat and request (HARQ) mechanism for multicast/broadcast services in 5G New Radio (NR) systems. HARQ is widely used in unicast transmission to improve reliability and resource efficiency under the fading channel. However, for multicast/broadcast, it is difficult to apply conventional HARQ technology because the probability of retransmission becomes high as the number of receiver increases. In this paper, we propose a novel and efficient retransmission scheme, called outer code- based HARQ. After the initial transmission of a given data packet for multicast/broadcast, each receiver sends feedback information on how many code blocks (CBs) are broken instead of which CBs are broken. Then, for retransmission of the data, the transmitter generates parity CBs by using outer code such as Reed- Solomon (RS) or Raptor code and transmits the parity CBs after applying inner code such as low density parity check (LDPC) code. Numerical results show that the proposed scheme outperforms the conventional HARQ schemes, reducing more than 50% of retransmissions.
研究了5G新无线电(NR)系统中多播/广播业务的自动重复请求(HARQ)混合机制。为了提高衰落信道下单播传输的可靠性和资源利用率，HARQ被广泛应用于单播传输。然而，对于组播/广播来说，随着接收方数量的增加，重传的概率越来越高，因此很难应用传统的HARQ技术。在本文中，我们提出了一种新颖高效的重传方案，称为基于外码的HARQ。在初始传输给定的多播/广播数据包后，每个接收方发送的反馈信息是有多少个编码块(CBs)被破坏，而不是哪些CBs被破坏。然后，为了重新传输数据，发射机使用RS (Reed- Solomon)或Raptor码等外部代码生成奇偶校验CBs，并使用低密度奇偶校验(low density parity check, LDPC)码等内部代码发送奇偶校验CBs。数值结果表明，该方案优于传统的HARQ方案，减少了50%以上的重传次数。
{"title":"Outer Code-Based HARQ Retransmission for Multicast/Broadcast Services in 5G","authors":"Jeongho Yeo, J. Bang, Hyoungju Ji, Younsun Kim, Juho Lee","doi":"10.1109/VTCFall.2019.8891304","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891304","url":null,"abstract":"This paper studies a hybrid automatic repeat and request (HARQ) mechanism for multicast/broadcast services in 5G New Radio (NR) systems. HARQ is widely used in unicast transmission to improve reliability and resource efficiency under the fading channel. However, for multicast/broadcast, it is difficult to apply conventional HARQ technology because the probability of retransmission becomes high as the number of receiver increases. In this paper, we propose a novel and efficient retransmission scheme, called outer code- based HARQ. After the initial transmission of a given data packet for multicast/broadcast, each receiver sends feedback information on how many code blocks (CBs) are broken instead of which CBs are broken. Then, for retransmission of the data, the transmitter generates parity CBs by using outer code such as Reed- Solomon (RS) or Raptor code and transmits the parity CBs after applying inner code such as low density parity check (LDPC) code. Numerical results show that the proposed scheme outperforms the conventional HARQ schemes, reducing more than 50% of retransmissions.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84004342","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891290
Zhangfeng Ma, B. Ai, R. He, Z. Zhong
Unmanned aerial vehicles (UAVs) communications are considered as a promising technology in various areas. In this paper, a three-dimensional (3D) non- stationary geometry-based stochastic model (GBSM) is proposed for UAV air-to- air (A2A) communication environments. The proposed GBSM considers not only both the ground surface and roadside reflections, but also the arbitrary trajectories of both UAV terminals. Based on the proposed model, some important statistical properties such as time- variant time-frequency correlation function and the Doppler power spectrum are derived and analyzed. Finally, numerical results show that a variation of the velocity and moving direction of the UAV has major impacts on the statistical properties of the radio channels, which indicates its usefulness for the performance analysis of UAV communication systems under non- stationary conditions.
{"title":"A 3D Air-to-Air Wideband Non-Stationary Channel Model of UAV Communications","authors":"Zhangfeng Ma, B. Ai, R. He, Z. Zhong","doi":"10.1109/VTCFall.2019.8891290","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891290","url":null,"abstract":"Unmanned aerial vehicles (UAVs) communications are considered as a promising technology in various areas. In this paper, a three-dimensional (3D) non- stationary geometry-based stochastic model (GBSM) is proposed for UAV air-to- air (A2A) communication environments. The proposed GBSM considers not only both the ground surface and roadside reflections, but also the arbitrary trajectories of both UAV terminals. Based on the proposed model, some important statistical properties such as time- variant time-frequency correlation function and the Doppler power spectrum are derived and analyzed. Finally, numerical results show that a variation of the velocity and moving direction of the UAV has major impacts on the statistical properties of the radio channels, which indicates its usefulness for the performance analysis of UAV communication systems under non- stationary conditions.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86714176","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891521
Ali A. Abdallah, Z. Kassas
An indoor pedestrian localization system which is based on cellular long-term evolution (LTE) carrier phase measurements and synthetic aperture navigation (SAN) is developed. The proposed system relies on a moving antenna array to determine the direction-of-arrival (DOA) of received LTE signals, while suppressing multipath signals. Two schemes are studied to couple LTE carrier phase measurements with SAN: (1) feedforward LTE-SAN and (2) feedback LTE-SAN. The performance of both coupling schemes is validated experimentally in a challenging indoor environment, in which the proposed system traversed a distance of 126.8 m in 100 seconds, while receiving LTE signals from 6 eNodeBs. The position root mean-squared error (RMSE) exhibited by the proposed LTE-SAN approach was 5.20 m and 4.32 m with feedforward and feedback coupling, respectively, compared with 7.19 m using a standalone LTE approach.
{"title":"Evaluation of Feedback and Feedforward Coupling of Synthetic Aperture Navigation with LTE Signals","authors":"Ali A. Abdallah, Z. Kassas","doi":"10.1109/VTCFall.2019.8891521","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891521","url":null,"abstract":"An indoor pedestrian localization system which is based on cellular long-term evolution (LTE) carrier phase measurements and synthetic aperture navigation (SAN) is developed. The proposed system relies on a moving antenna array to determine the direction-of-arrival (DOA) of received LTE signals, while suppressing multipath signals. Two schemes are studied to couple LTE carrier phase measurements with SAN: (1) feedforward LTE-SAN and (2) feedback LTE-SAN. The performance of both coupling schemes is validated experimentally in a challenging indoor environment, in which the proposed system traversed a distance of 126.8 m in 100 seconds, while receiving LTE signals from 6 eNodeBs. The position root mean-squared error (RMSE) exhibited by the proposed LTE-SAN approach was 5.20 m and 4.32 m with feedforward and feedback coupling, respectively, compared with 7.19 m using a standalone LTE approach.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89219302","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891546
Kenji Hoshino, Shoichi Sudo, Y. Ohta
High-altitude platform station (HAPS) has attracted considerable attention as a new promising platform to provide mobile wireless communication services with ultra-wide coverage and resilience against disaster. Because of its low-delay characteristics, HAPS can provide wireless service directly to smartphones used in terrestrial networks. In a HAPS system, it is required to employ multiple cells to accommodate high communication traffic. Furthermore, the HAPS movement caused by its turning flight or variations in the stratospheric wind is known to result in the displacement of cells projected on the ground. Therefore, the HAPS movement with multicells configuration results in several handovers and disconnections. Some research has shown that this challenge can be addressed by employing antenna beamforming based on a planar or flat-shaped array antenna. Because the target diameters of coverages are only 60 to 80 km, these simple antennas can easily cover the whole coverage area; thus, they can compensate for the displacement easily. However, to achieve ultra-wide coverage over 80-km diameter, drastic change of its antenna design is needed. Therefore, this paper proposes a new antenna structure and its beamforming methods assuming a solar-plane- based HAPS with a 200-km diameter. Computer simulation quantitatively reveals that the proposed antenna can well compensate for the effect of a displaced cell.
{"title":"A Study on Antenna Beamforming Method Considering Movement of Solar Plane in HAPS System","authors":"Kenji Hoshino, Shoichi Sudo, Y. Ohta","doi":"10.1109/VTCFall.2019.8891546","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891546","url":null,"abstract":"High-altitude platform station (HAPS) has attracted considerable attention as a new promising platform to provide mobile wireless communication services with ultra-wide coverage and resilience against disaster. Because of its low-delay characteristics, HAPS can provide wireless service directly to smartphones used in terrestrial networks. In a HAPS system, it is required to employ multiple cells to accommodate high communication traffic. Furthermore, the HAPS movement caused by its turning flight or variations in the stratospheric wind is known to result in the displacement of cells projected on the ground. Therefore, the HAPS movement with multicells configuration results in several handovers and disconnections. Some research has shown that this challenge can be addressed by employing antenna beamforming based on a planar or flat-shaped array antenna. Because the target diameters of coverages are only 60 to 80 km, these simple antennas can easily cover the whole coverage area; thus, they can compensate for the displacement easily. However, to achieve ultra-wide coverage over 80-km diameter, drastic change of its antenna design is needed. Therefore, this paper proposes a new antenna structure and its beamforming methods assuming a solar-plane- based HAPS with a 200-km diameter. Computer simulation quantitatively reveals that the proposed antenna can well compensate for the effect of a displaced cell.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91423059","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891107
Takamasa Higuchi, Seyhan Uçar, O. Altintas
This paper investigates the design and feasibility of Co-Park, where a group of connected vehicles in a parking facility collaborate with each other to find available parking spots in a timely fashion. Vehicles measure occupancy of the surrounding parking spots by their on-board sensors, and share the occupancy information with other group members over vehicular networks. Based on prediction of the short-term occupancy variation and coordination among group members, the vehicles strategically plan efficient paths to search for an available spot. Simulation results show that the system can significantly reduce the trip time in a parking facility.
{"title":"A Collaborative Approach to Finding Available Parking Spots","authors":"Takamasa Higuchi, Seyhan Uçar, O. Altintas","doi":"10.1109/VTCFall.2019.8891107","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891107","url":null,"abstract":"This paper investigates the design and feasibility of Co-Park, where a group of connected vehicles in a parking facility collaborate with each other to find available parking spots in a timely fashion. Vehicles measure occupancy of the surrounding parking spots by their on-board sensors, and share the occupancy information with other group members over vehicular networks. Based on prediction of the short-term occupancy variation and coordination among group members, the vehicles strategically plan efficient paths to search for an available spot. Simulation results show that the system can significantly reduce the trip time in a parking facility.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91436921","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891471
M. Ranaweera, A. Seneviratne, D. Rey, M. Saberi, V. Dixit
The world is embracing the presence of connected autonomous vehicles which are expected to play a major role in the future of intelligent transport systems. Given such connectivity, vehicles in the networks are vulnerable to making incorrect decisions due to anomalous data. No sophisticated attacks are required; just a vehicle reporting anomalous speeds would be sufficient to disrupt the entire traffic flow. Detection of such anomalies is vital for a secured vehicular network. Nevertheless, the attention given for the use of physics of traffic flow to secure vehicular networks is relatively less. We propose to integrate traffic flow phenomena within anomalous data detection techniques to improve the evaluation of threats in vehicular networks. We apply traffic flow theory under steady state assumptions to identify anomalous data. The numerical results indicate the proposed method to provide reliable and consistent predictions.
{"title":"Anomalous Data Detection in Vehicular Networks Using Traffic Flow Theory","authors":"M. Ranaweera, A. Seneviratne, D. Rey, M. Saberi, V. Dixit","doi":"10.1109/VTCFall.2019.8891471","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891471","url":null,"abstract":"The world is embracing the presence of connected autonomous vehicles which are expected to play a major role in the future of intelligent transport systems. Given such connectivity, vehicles in the networks are vulnerable to making incorrect decisions due to anomalous data. No sophisticated attacks are required; just a vehicle reporting anomalous speeds would be sufficient to disrupt the entire traffic flow. Detection of such anomalies is vital for a secured vehicular network. Nevertheless, the attention given for the use of physics of traffic flow to secure vehicular networks is relatively less. We propose to integrate traffic flow phenomena within anomalous data detection techniques to improve the evaluation of threats in vehicular networks. We apply traffic flow theory under steady state assumptions to identify anomalous data. The numerical results indicate the proposed method to provide reliable and consistent predictions.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80539533","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891124
Yan Peng, Yiqing Zhou, Ling Liu, Jinhong Yuan, Jinglin Shi, Jintao Li
In ultra-dense cellular networks (UDNs) with user/control plane (U/C) splitting, frequent handovers in user planes are unavoidable. This seriously degrades MS's transmission control protocol (TCP) throughput. This paper proposes a prediction-based user plane handover scheme to improve the TCP throughput in UDNs. Firstly, based on algorithms used in recommender systems, a mobility prediction algorithm called content-based collaborative hybrid filters (CCHF) is proposed to predict the target small base station (SBS). When the mobile station (MS) moves into the cell-edge of the source SBS, it can set up connections to the predicted target SBS and the source SBS simultaneously. An accurate prediction and a simultaneous connection can enhance the signal to interference and noise ratio (SINR) at cell-edge and reduce the handover interruption ratio (HIR). Thus packet loss can be reduced and the MS's TCP throughput will be improved. Simulations are carried out to verify the effectiveness of the proposed CCHF-handover. It is shown that using CCHF, the prediction accuracy of random trajectory can be improved by more than 100% compared with existing prediction algorithm. Moreover, the CCHF-handover improves the average TCP throughput significantly by more than 3 times compared with that of existing handover schemes.
{"title":"Prediction-Based User Plane Handover for TCP Throughput Enhancement in Ultra-Dense Cellular Networks","authors":"Yan Peng, Yiqing Zhou, Ling Liu, Jinhong Yuan, Jinglin Shi, Jintao Li","doi":"10.1109/VTCFall.2019.8891124","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891124","url":null,"abstract":"In ultra-dense cellular networks (UDNs) with user/control plane (U/C) splitting, frequent handovers in user planes are unavoidable. This seriously degrades MS's transmission control protocol (TCP) throughput. This paper proposes a prediction-based user plane handover scheme to improve the TCP throughput in UDNs. Firstly, based on algorithms used in recommender systems, a mobility prediction algorithm called content-based collaborative hybrid filters (CCHF) is proposed to predict the target small base station (SBS). When the mobile station (MS) moves into the cell-edge of the source SBS, it can set up connections to the predicted target SBS and the source SBS simultaneously. An accurate prediction and a simultaneous connection can enhance the signal to interference and noise ratio (SINR) at cell-edge and reduce the handover interruption ratio (HIR). Thus packet loss can be reduced and the MS's TCP throughput will be improved. Simulations are carried out to verify the effectiveness of the proposed CCHF-handover. It is shown that using CCHF, the prediction accuracy of random trajectory can be improved by more than 100% compared with existing prediction algorithm. Moreover, the CCHF-handover improves the average TCP throughput significantly by more than 3 times compared with that of existing handover schemes.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83470391","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891359
Bowen Feng, J. Jiao, Kexin Liang, Shaohua Wu, Ye Wang, Qinyu Zhang
The soft-decision decoding of polar codes is a trend that will be extensively applied in modern complex communication systems. However, the existing soft-decision decoding of polar codes is not satisfied due to the poor performance and high complexity. In this paper, a novel adjustable list decoding and its soft-decision type are proposed. Some bounds are given to depict the features of the decoding list with a correct path, which provides a guide to adjust the decoding list. The proposed adjustable list decoding scheme can achieve an equivalent performance to conventional SCL with significant lower complexity. Moreover, the soft adjustable list decoding can also outperform than the conventional soft-decision decoding schemes in concatenated structures.
{"title":"Adjustable Soft List Decoding for Polar Codes","authors":"Bowen Feng, J. Jiao, Kexin Liang, Shaohua Wu, Ye Wang, Qinyu Zhang","doi":"10.1109/VTCFall.2019.8891359","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891359","url":null,"abstract":"The soft-decision decoding of polar codes is a trend that will be extensively applied in modern complex communication systems. However, the existing soft-decision decoding of polar codes is not satisfied due to the poor performance and high complexity. In this paper, a novel adjustable list decoding and its soft-decision type are proposed. Some bounds are given to depict the features of the decoding list with a correct path, which provides a guide to adjust the decoding list. The proposed adjustable list decoding scheme can achieve an equivalent performance to conventional SCL with significant lower complexity. Moreover, the soft adjustable list decoding can also outperform than the conventional soft-decision decoding schemes in concatenated structures.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81162900","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 : 2019-09-01DOI: 10.1109/VTCFall.2019.8891218
S. Ragothaman, Mahdi Maaref, Z. Kassas
Unmanned aerial vehicle (UAV) trajectory planning in urban environments is considered. Equipped with a three- dimensional (3-D) environment map, the UAV navigates by fusing global navigation satellite systems (GNSS) signals with ambient cellular signals of opportunity. A trajectory planning approach is developed to allow the UAV to reach a target location, while constraining its position uncertainty and multipath- induced biases in cellular pseudoranges to be below a desired threshold. Experimental results are presented demonstrating that following the proposed trajectory yields a reduction of 30.69% and 58.86% in the position root-mean squared error and the maximum position error, respectively, compared to following the shortest trajectory between the start and target locations.
{"title":"Multipath-Optimal UAV Trajectory Planning for Urban UAV Navigation with Cellular Signals","authors":"S. Ragothaman, Mahdi Maaref, Z. Kassas","doi":"10.1109/VTCFall.2019.8891218","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891218","url":null,"abstract":"Unmanned aerial vehicle (UAV) trajectory planning in urban environments is considered. Equipped with a three- dimensional (3-D) environment map, the UAV navigates by fusing global navigation satellite systems (GNSS) signals with ambient cellular signals of opportunity. A trajectory planning approach is developed to allow the UAV to reach a target location, while constraining its position uncertainty and multipath- induced biases in cellular pseudoranges to be below a desired threshold. Experimental results are presented demonstrating that following the proposed trajectory yields a reduction of 30.69% and 58.86% in the position root-mean squared error and the maximum position error, respectively, compared to following the shortest trajectory between the start and target locations.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81190207","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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