2023 VTS Asia Pacific Wireless Communications Symposium (APWCS)最新文献

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Design and Verification of High-Order QAM Transceiver Systems for mmWave SDRs under Large Delay Multipath and High Frequency Offset Effects 大延迟多径和高频偏移效应下毫米波sdr高阶QAM收发系统的设计与验证
2023 VTS Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2023-08-01 DOI: 10.1109/APWCS60142.2023.10234044
Keng-Hwa Liu, Kai-Yun Hong, Juinn-Horng Deng
{"title":"Design and Verification of High-Order QAM Transceiver Systems for mmWave SDRs under Large Delay Multipath and High Frequency Offset Effects","authors":"Keng-Hwa Liu, Kai-Yun Hong, Juinn-Horng Deng","doi":"10.1109/APWCS60142.2023.10234044","DOIUrl":"https://doi.org/10.1109/APWCS60142.2023.10234044","url":null,"abstract":"Future communication technologies offer the benefits of wide coverage, low latency, and high speeds. In particular, low-Earth orbit (LEO) satellite transmission will play an important role in 5G and 6G systems. However, with high-speed mobile and high-frequency transmission, the Doppler effect can seriously affect the demodulation performance of the receiver. This paper addresses the problem of deriving factors such as large-delay multi-path interference and high-frequency offset effects when using high-order QAM modulation signals for long-distance communication, e.g., 256 QAM for LEO satellite communication. To overcome the high Doppler effect, we adopt a phase locked loop (PLL) with preprocessing high-order power operation and cross-correlation scheme. Next, an adaptive decision feedback equalizer is employed to eliminate the multipath factor. Furthermore, a hybrid LDPC channel decoder is utilized to improve packet error rate performance. Finally, we complete simulation and verification of the high-order QAM transceiver algorithms. Moreover, the actual measurements of the mmWave phase array software defined radio (SDR) platform confirm the proposed transceiver algorithms being useful in the high Doppler and large delay spread environments.","PeriodicalId":375211,"journal":{"name":"2023 VTS Asia Pacific Wireless Communications Symposium (APWCS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133347245","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}
引用次数: 0
Learning-based Dynamic 3D Placement of Multiple Aerial Base Stations with Heterogeneous Traffic 基于学习的多航空基站异构流量动态三维布局
2023 VTS Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2023-08-01 DOI: 10.1109/APWCS60142.2023.10233963
L. T. Hoang, Chuyen T. Nguyen, Hoang D. Le, A. Pham
{"title":"Learning-based Dynamic 3D Placement of Multiple Aerial Base Stations with Heterogeneous Traffic","authors":"L. T. Hoang, Chuyen T. Nguyen, Hoang D. Le, A. Pham","doi":"10.1109/APWCS60142.2023.10233963","DOIUrl":"https://doi.org/10.1109/APWCS60142.2023.10233963","url":null,"abstract":"Deployment of Unmanned Aerial Vehicles (UAVs) as aerial base stations (ABSs) has emerged as a promising solution to enable high-quality services in next-generation mobile networks. One key challenge is how to place the UAV-mounted Base Stations (UAV-BSs) dynamically over time in response to changes in network situations. Conventional methods usually utilize location information to place the UAV-BSs at the centroid of all users to maximize the average downlink rate. This approach might become ineffective when the traffic demand is highly heterogeneous among users, causing the spatial distribution of traffic demand not to correlate with the distribution of users. This paper considers a time-evolving multi-user multi-server system with heterogeneous traffic, where a group of UAV-BSs provides different services to ground mobile users. We formulate a long-term maximization problem of the user’s time-average download speed with the queue stability constraint under random movements of ground users. An actor-critic framework of deep reinforcement learning is proposed to position multiple UAV-BSs efficiently based on a comprehensive view of the network situation, including spatial statistics of the users, traffic demand, and the network’s downlink rate. The framework’s core module is a deep neural network (DNN) that obtains the UAV’s location and three encoded heatmaps of network statistics to predict the optimal movement for UAV-BSs. Extensive simulations demonstrate the guaranteed convergence and great potential of the proposed method regarding the backlog queue length and the average download speed of users.","PeriodicalId":375211,"journal":{"name":"2023 VTS Asia Pacific Wireless Communications Symposium (APWCS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122108856","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}
引用次数: 0
Balancing Available Energy Distribution in Massive MIMO SWIPT Sensor Networks 大规模MIMO SWIPT传感器网络中可用能量分布的平衡
2023 VTS Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2023-08-01 DOI: 10.1109/APWCS60142.2023.10233958
Su-Jung Shin, Prince Anokye, Kyoung-Jae Lee
{"title":"Balancing Available Energy Distribution in Massive MIMO SWIPT Sensor Networks","authors":"Su-Jung Shin, Prince Anokye, Kyoung-Jae Lee","doi":"10.1109/APWCS60142.2023.10233958","DOIUrl":"https://doi.org/10.1109/APWCS60142.2023.10233958","url":null,"abstract":"Simultaneous wireless information and power transfer (SWIPT) has emerged as a promising technology for the Internet of Things (IoT) and energy-constrained devices. In such networks, sensor nodes (SNs) harvest energy from the access point’s (AP) downlink transmission and utilize the harvested energy for uplink data transmission. However, ensuring a fair distribution of available energy among the SNs remains a significant challenge. This paper aims to address this challenge by proposing an optimization algorithm for a SWIPT network with an AP and multiple SNs. We formulate and solve a maxmin optimization problem to fairly distribute the available energy among the SNs. The performance of the proposed algorithm is evaluated through simulations, demonstrating a more even and fair distribution of available energy among the SNs compared to the equal power case. The results highlight the effectiveness of the proposed optimization algorithm in improving the performance and fairness of SWIPT networks, paving the way for future research in this area.","PeriodicalId":375211,"journal":{"name":"2023 VTS Asia Pacific Wireless Communications Symposium (APWCS)","volume":"20 25","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131505710","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}
引用次数: 0
Identifying Emotions for Virtual Reality Based on Eye Tracking and Cloud Computing 基于眼动追踪和云计算的虚拟现实情感识别
2023 VTS Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2023-08-01 DOI: 10.1109/APWCS60142.2023.10234036
Yi-Chun Liu, Huai-Sheng Huang
{"title":"Identifying Emotions for Virtual Reality Based on Eye Tracking and Cloud Computing","authors":"Yi-Chun Liu, Huai-Sheng Huang","doi":"10.1109/APWCS60142.2023.10234036","DOIUrl":"https://doi.org/10.1109/APWCS60142.2023.10234036","url":null,"abstract":"With the rapid development of virtual reality technology, immersive experiences have become the new generation’s sought-after entertainment feast. Nowadays, various industries have also started utilizing virtual reality for vocational training in fields such as education, healthcare, entertainment, and military. In virtual environments, users can interact socially with others through virtual avatars as their representatives. In this study, we aim to integrate virtual reality devices, eye-tracking devices, and public cloud computing services to infer emotions based on changes in eye data. We evaluate the average accuracy of the proposed model and hope to enhance the facial emotions of avatars to better align with users’ intentions. This study will contribute to improving the authenticity of social interaction and providing users with a better social experience in virtual reality environments.","PeriodicalId":375211,"journal":{"name":"2023 VTS Asia Pacific Wireless Communications Symposium (APWCS)","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121019908","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}
引用次数: 0
Model Pruning for Wireless Federated Learning with Heterogeneous Channels and Devices 基于异构信道和设备的无线联邦学习模型修剪
2023 VTS Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2023-08-01 DOI: 10.1109/APWCS60142.2023.10234035
Da-Wei Wang, Chi-Kai Hsieh, Kun-Lin Chan, Feng-Tsun Chien
{"title":"Model Pruning for Wireless Federated Learning with Heterogeneous Channels and Devices","authors":"Da-Wei Wang, Chi-Kai Hsieh, Kun-Lin Chan, Feng-Tsun Chien","doi":"10.1109/APWCS60142.2023.10234035","DOIUrl":"https://doi.org/10.1109/APWCS60142.2023.10234035","url":null,"abstract":"Federated learning (FL) enables distributed model training, ensuring user privacy and reducing communication overheads. Model pruning further improves learning efficiency by removing weight connections in neural networks, increasing inference speed and reducing model storage size. While a larger pruning ratio shortens latency in each communication round, a larger number of communication rounds is needed for convergence. In this work, a training-based pruning ratio decision policy is proposed for wireless federated learning. By jointly minimizing average gradients and training latency with a given specific time budget, we optimize the pruning ratio for each device and the total number of training rounds. Numerical results demonstrate that the proposed algorithm achieves a faster convergence rate and lower latency compared to the existing approach.","PeriodicalId":375211,"journal":{"name":"2023 VTS Asia Pacific Wireless Communications Symposium (APWCS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125964176","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}
引用次数: 0
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