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2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)最新文献

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Performance of CRC-Aided Erasure Demodulation for M-ary Chirp Spread Spectrum Signal 扩频信号的crc辅助擦除解调性能研究
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548725
Y. Sanada, Takumi Ono
{"title":"Performance of CRC-Aided Erasure Demodulation for M-ary Chirp Spread Spectrum Signal","authors":"Y. Sanada, Takumi Ono","doi":"10.1109/APWCS50173.2021.9548725","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548725","url":null,"abstract":"In this paper, erasure demodulation for an M-ary chirp spread spectrum signal is proposed. This demodulation scheme is assumed to be implemented in IoT devices to receive a deactivation command. In the erasure demodulation scheme a demodulator regards bit elements in a coded bit sequence as erasure if the corresponding correlator output is larger than a threshold and they are different from bit elements in a coded bit sequence for the maximum correlator output. Those erasure bits are treated as both \"0\" and \"1\" and cyclic redundancy check (CRC) decoding following the erasure demodulation checks which output is correct. As one of those outputs must be the same as the transmit coded bit, block error rate (BLER) performance improves. Even though the erasure demodulation increases the probability of false alarm, it can reduce the miss probability of deactivation. On the other hand, as the number of erasure bits increases, the number of CRC decoding operations grows exponentially and the probability of CRC miss detection also increases. Thus, the threshold level has to be decided according to the computational capability of each IoT device, the target BLER, and the probability of CRC miss detection. The performance of CRC miss detection and the BLER on a Rayleigh fading channel, a Rician fading channel, and a Vehicular-B channel are evaluated through computer simulation. Furthermore, cumulative distribution function curves for the number of erasure bits are also presented for different channel models.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129645094","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
Performance Evaluation of Neural Network-based Offset Optimization in Cell Range Expansion for Multiple Frequency Bands 多频段小区扩展中基于神经网络的偏移优化性能评价
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548718
Ryuya Sembo, N. Miki
{"title":"Performance Evaluation of Neural Network-based Offset Optimization in Cell Range Expansion for Multiple Frequency Bands","authors":"Ryuya Sembo, N. Miki","doi":"10.1109/APWCS50173.2021.9548718","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548718","url":null,"abstract":"The amount of data traffic over the mobile network is still increasing. To support such large amount of traffic, additional higher frequency usage is one of the promising techniques. The network needs to carefully associate the users to the base stations and frequency bands, since users can connect multiple BSs and multiple frequency bands in such deployments. In order to offload the users effectively, the cell range expansion (CRE) is effective, and the offset values can be optimized by the neural network (NN). In the paper, we evaluate the performance of the NN-based offset optimization in CRE for multiple frequency bands. Simulation results show the good trade-off between the performance and the amount of feedback from the users.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121467792","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
Development of High Altitude Platform Station Backhaul System Using 38GHz Band Frequency 38GHz频段高空台站回程系统的研制
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548757
Hiromu Kitanozono, J. Suzuki, Y. Kishiyama, Y. Hokazono, T. Sotoyama, M. Ouchi, R. Miura, H. Tsuji
{"title":"Development of High Altitude Platform Station Backhaul System Using 38GHz Band Frequency","authors":"Hiromu Kitanozono, J. Suzuki, Y. Kishiyama, Y. Hokazono, T. Sotoyama, M. Ouchi, R. Miura, H. Tsuji","doi":"10.1109/APWCS50173.2021.9548757","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548757","url":null,"abstract":"In order to support the mid-2020 and beyond, the development of high-speed, high-capacity wireless communication systems for 5G (5th Generation) networks has become an urgent and important issue in areas where optical fiber installation has not progressed due to geographical and economic reasons. Toward the 5G and beyond networks, HAPS (High Altitude Platform Station) which is located at an altitude of 20km can provide communication links to aircraft, drones, flying cars, ships, and expand the coverage to the sky and the sea. The HAPS makes it possible to provide low latency, high speed 5G communication services in these areas, and it is also possible to realize a communication system that can handle all use cases. This paper describes the development status of a 5G network backhaul system using HAPS in the millimeter wave band. This research and development is carried out from 2020 to 2023 by the Ministry of Internal Affairs and Communications \"Research and Development for Expansion of Radio Resources\".","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123210828","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: 3
Research on the Placement Method of UAV Base Stations for Dynamic Users 面向动态用户的无人机基站布局方法研究
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548763
Masanori Ozasa, G. Tran, K. Sakaguchi
{"title":"Research on the Placement Method of UAV Base Stations for Dynamic Users","authors":"Masanori Ozasa, G. Tran, K. Sakaguchi","doi":"10.1109/APWCS50173.2021.9548763","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548763","url":null,"abstract":"The high density of temporary hotspots will result in a significant reduction in data rates per user. In addition, when base stations are no longer functional in the disaster area, it is necessary to develop wireless infrastructure as soon as possible. To address this situation, we focus on UAVs (Unmanned Aerial Vehicles) equipped with wireless communication infrastructure to provide services. Building a wireless network with mobility, UAVs can provide high data rates for ever-changing user distribution. In this paper, for dynamic user distributions, which have not been considered much so far, we identify issues due to differences from static user distributions and propose methods to solve them. This paper reports on the study of UAV placement method from the viewpoint of data rate and power consumption.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129102131","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: 3
Local ARQ: A New Way for Exploiting Multiple Detection-Terminals 本地ARQ:一种利用多检测终端的新方法
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548720
Hokuto Taromaru, H. Murata, Toshiro Nakahira, M. Sasaki, Takatsune Moriyama
{"title":"Local ARQ: A New Way for Exploiting Multiple Detection-Terminals","authors":"Hokuto Taromaru, H. Murata, Toshiro Nakahira, M. Sasaki, Takatsune Moriyama","doi":"10.1109/APWCS50173.2021.9548720","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548720","url":null,"abstract":"Collaborative multiple-input multiple-output (MIMO) reception is a new form of MIMO transmission technique. In collaborative MIMO reception, neighboring mobile stations (MSs) collaborate with a target MS to decode MIMO signals from a base station. In this study, an MS side error-control scheme that utilizes multiple detection MSs within the collaborative MS group is proposed. In this scheme, a detection MS requests a better detected bit sequence from other MSs, similar to automatic repeat request performed locally. This scheme improves the error rate performance at the expense of computational complexity. Computer simulations are used to study the frame error ratio performance and the amount of collaboration traffic.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132159008","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: 1
Influence of Design-SNR on BER Performance under BP Decoder 设计信噪比对BP解码器误码率性能的影响
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548765
Kohei Ueda, S. Suyama, T. Asai, N. Miki
{"title":"Influence of Design-SNR on BER Performance under BP Decoder","authors":"Kohei Ueda, S. Suyama, T. Asai, N. Miki","doi":"10.1109/APWCS50173.2021.9548765","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548765","url":null,"abstract":"In order to reduce the decoding latency, the belief propagation (BP) decoder, which is generally used for decoding of the low-density parity-check (LDPC) codes, is effective. In general, the error rate performance of BP decoder is degraded. Therefore, this paper investigates the influence of design signal-to-noise ratio (SNR) on the bit error rate (BER) performance under BP decoder. We first generate the multiple polar codes by setting the multiple design-SNR. The BER performance is used to optimize the polar code for the BP decoder. The simulation results employing N = 1024 and the coding rate of 1/2 show that by setting slightly larger design-SNR compared to the SC decoder, the BER performance is slightly improved.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130400499","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
Iterative Demodulation and Decoding with Blind Channel Estimator for LoRa Modulation 基于盲信道估计的LoRa调制迭代解调与译码
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548767
Takuya Mihara, S. Ibi, Takumi Takahashi, H. Iwai
{"title":"Iterative Demodulation and Decoding with Blind Channel Estimator for LoRa Modulation","authors":"Takuya Mihara, S. Ibi, Takumi Takahashi, H. Iwai","doi":"10.1109/APWCS50173.2021.9548767","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548767","url":null,"abstract":"This paper proposes an iterative detection and decoding (IDD) scheme with a blind channel estimator in the physical layer of long range widearea network (LoRaWAN). The proposed scheme exchanges log-likelihood ratios (LLRs) as soft decision values between the LoRa demodulator and the Hamming decoder to improve the signal detection capability while obtaining the iterative gain. In the typical LoRa demodulation using hard decision without IDD, the received signal is detected by the binary values, i.e. \"0\" or \"1\"; and thus, the demodulation and decoding processes are simplified. However, the resulting rounding error occurs the mutual information loss, leading to non-negligible performance degradation. In order to cope with this issue, it is vital to capture the stochastic behavior of the input and output values of the demodulator and decoder. The LLR based on the stochastic signal model enables to improve the error correction capability of the decoder and enhance the iterative gain. Finally, computer simulation results explicitly demonstrate the efficacy of the proposed method in terms of bit error rate (BER) performance.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130693440","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: 2
BLER Performance of Circular 256QAM Schemes Considering Cubic Metric for DFT-Precoded OFDM dft预编码OFDM中考虑三次度量的圆形256QAM方案的BLER性能
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548724
Yugo Sasaki, M. Sawahashi, Y. Kishiyama
{"title":"BLER Performance of Circular 256QAM Schemes Considering Cubic Metric for DFT-Precoded OFDM","authors":"Yugo Sasaki, M. Sawahashi, Y. Kishiyama","doi":"10.1109/APWCS50173.2021.9548724","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548724","url":null,"abstract":"This paper presents the average block error rate (BLER) performance of circular 256QAM schemes considering a peak-to-average power ratio measure called a cubic metric (CM) for discrete Fourier transform (DFT)-precoded orthogonal frequency division multiplexing (OFDM) in multipath fading channels. Computer simulation results show that the required average received signal-to-noise power ratio (SNR) satisfying the average BLER of 10−2 considering the CM for the (16×16) circular 256QAM constellation is deceased by approximately 0.5 dB, and that for the (32×8) and (64×4) circular 256QAM constellations is deceased by approximately 0.3 dB compared to the rectangular 256QAM scheme when using reference signal (RS) based channel estimation. Therefore, we conclude that the circular 256QAM constellation with independent bit mapping to either the phase or amplitude information is effective in achieving a lower required average received SNR satisfying the target average BLER than that for rectangular 256QAM considering the CM in multipath fading channels.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121906349","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
A Study on Conversion of NLoS to LoS conditions using Sidelink in Smart Factory Environments 智能工厂环境下基于旁链的非目标值到目标值的转换研究
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548715
Akihiro Kubota, S. Sampei, Takumi Takahashi
{"title":"A Study on Conversion of NLoS to LoS conditions using Sidelink in Smart Factory Environments","authors":"Akihiro Kubota, S. Sampei, Takumi Takahashi","doi":"10.1109/APWCS50173.2021.9548715","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548715","url":null,"abstract":"This paper proposes a method to change propagation path conditions for devices from non-line-of-sight (NLoS) conditions to line-of-sight (LoS) conditions using sidelink. In smart factory environments, although there are many obstacles that creates NLoS conditions for devices, many of such obstacles are also IoT devices that include a 5G transceiver. In this case, the obstacles can be relay nodes for devices nearby that are in NLoS area for base stations (BS). Thus, if the sidelink is employed for a link between the relay node and devices in NLoS conditions, a reliable wireless link is highly probable to establish. Moreover, because there are many relay node candidates for NLoS areas located devices in smart factories, devices located in NLoS area can flexibly choose an appropriate relay node as a sidelink repeater, which can enhance sidelink performances. Computer simulation confirms that the proposed scheme is very effective in enhancement of the area coverage.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"67 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121922598","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: 1
UWB-based Multiple UAV Control System for Indoor Ground Vehicle Tracking 基于uwb的多无人机室内地面车辆跟踪控制系统
2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS) Pub Date : 2021-08-01 DOI: 10.1109/APWCS50173.2021.9548721
Joo-Hyune Lee, J. Moon, Sunwoo Kim
{"title":"UWB-based Multiple UAV Control System for Indoor Ground Vehicle Tracking","authors":"Joo-Hyune Lee, J. Moon, Sunwoo Kim","doi":"10.1109/APWCS50173.2021.9548721","DOIUrl":"https://doi.org/10.1109/APWCS50173.2021.9548721","url":null,"abstract":"We present an Ultra-Wide Band (UWB)-based multiple Unmanned Aerial Vehicle (UAV) control system architecture to localize and track a ground vehicle. A team of UAVs self-localizes its position and measures distance to a ground vehicle using the mounted UWB module. The server utilizes the estimated position of UAV and distance measurements collected from radio communication between ground vehicle and UAVs (i.e., mobile anchor) in order to localize the ground vehicle accurately. The server then sends next setpoint to each UAVs and enables UAVs to form a polygon-shaped formation with a ground vehicle located at the center. We demonstrate our proposed system through the indoor ground vehicle tracking experiment. Our experiment results show that localization error with the mobile anchors is less than 0.2m; in addition, the fixed anchors can be replaced with the mobile anchors.","PeriodicalId":164737,"journal":{"name":"2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122447917","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: 7
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