Pub Date : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700460
Sijie Xia, Chang Ge, Qiang Chen, F. Adachi
Denser deployment of base stations (BSs) and higher frequency bands are inevitable in 5G-advanced systems with ever growing mobile data traffic. Due to the rectilinear propagation nature of high frequency radio signals and the limited signal processing power, cellular structured distributed antenna system with clustered multi-user multi-input multi-output (MU-MIMO) is considered attractive. Cellular structure and cluster structure (in each cell) greatly affect the system performance. We propose modified K-means based cellular structuring and clustering. The modified K-means based cellular structuring is compared by computer simulation with original K-means based one and the simple square division in terms of user capacity, fairness of user capacity and computational complexity of MU-MIMO processing.
{"title":"Cellular Structuring and Clustering for Distributed Antenna Systems","authors":"Sijie Xia, Chang Ge, Qiang Chen, F. Adachi","doi":"10.1109/wpmc52694.2021.9700460","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700460","url":null,"abstract":"Denser deployment of base stations (BSs) and higher frequency bands are inevitable in 5G-advanced systems with ever growing mobile data traffic. Due to the rectilinear propagation nature of high frequency radio signals and the limited signal processing power, cellular structured distributed antenna system with clustered multi-user multi-input multi-output (MU-MIMO) is considered attractive. Cellular structure and cluster structure (in each cell) greatly affect the system performance. We propose modified K-means based cellular structuring and clustering. The modified K-means based cellular structuring is compared by computer simulation with original K-means based one and the simple square division in terms of user capacity, fairness of user capacity and computational complexity of MU-MIMO processing.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117245829","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700421
Francisco Jesus, M. Sousa, Filipe Freitas, P. Vieira, A. Rodrigues, Tiago Rosa Maria Paula Queluz
Active Antenna Systems (AASs) play a key role in the performance of 5th Generation (5G) networks as they enable the use of Massive Multiple-Input Multiple-Output (mMIMO) and directional beamforming. Besides, AASs can be configured with distinct broadcast beams configurations. In this work, the coverage provided by the broadcast beam configurations of a real AAS is evaluated. A 3-Dimensional (3D) configurable synthetic scenario was proposed to evaluate the resulting 5G coverage from all the possible antenna beam configurations. This analysis revealed that beam configurations with several horizontal beams and one vertical are recommended for urban macro deployments. Moreover, it was demonstrated that the percentage of covered area in a real scenario is approximated by an equivalent synthetic scenario with a Pearson correlation of 0.98. The synthetic scenario has the advantage of not requiring 3D building databases. Finally, an interference analysis in multi-site real scenarios was conducted, where it was verified that some antenna configurations introduce excessive interference for the level of coverage provided.
{"title":"Evaluating 5G Coverage in 3D Scenarios under Configurable Antenna Beam Patterns","authors":"Francisco Jesus, M. Sousa, Filipe Freitas, P. Vieira, A. Rodrigues, Tiago Rosa Maria Paula Queluz","doi":"10.1109/wpmc52694.2021.9700421","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700421","url":null,"abstract":"Active Antenna Systems (AASs) play a key role in the performance of 5th Generation (5G) networks as they enable the use of Massive Multiple-Input Multiple-Output (mMIMO) and directional beamforming. Besides, AASs can be configured with distinct broadcast beams configurations. In this work, the coverage provided by the broadcast beam configurations of a real AAS is evaluated. A 3-Dimensional (3D) configurable synthetic scenario was proposed to evaluate the resulting 5G coverage from all the possible antenna beam configurations. This analysis revealed that beam configurations with several horizontal beams and one vertical are recommended for urban macro deployments. Moreover, it was demonstrated that the percentage of covered area in a real scenario is approximated by an equivalent synthetic scenario with a Pearson correlation of 0.98. The synthetic scenario has the advantage of not requiring 3D building databases. Finally, an interference analysis in multi-site real scenarios was conducted, where it was verified that some antenna configurations introduce excessive interference for the level of coverage provided.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114177282","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700449
Hidetomo Ochiai, K. Mizutani, H. Harada
The wireless smart ubiquitous network field area network (Wi-SUN FAN) is a wireless communication standard for the Internet of things (IoT) in outdoor large-scale multi-hop networks. Currently, frequency shift keying (FSK) standardized in IEEE 802.15.4 is employed as the physical layer of the Wi-SUN FAN. Improving data rate of the physical layer is essential to realize expected requirements toward the next-generation IoT systems. In this paper, we introduce the orthogonal frequency division multiplexing (OFDM) standardized in IEEE 802.15.4 into the Wi-SUN FAN to improve data rate without increasing the system bandwidth. We evaluated the packet error rate (PER) characteristics under inter-signal interference in the transition period of the physical layer from FSK to OFDM through a computer simulation. Results showed that the new interference caused by the mixture of OFDM degraded the PER characteristics, in comparison with the interference between FSKs. However, the interference between different channels was limited because the required carrier-to-interference power ratio to achieve PER=10% was below –10dB. Furthermore, we evaluated the transmission characteristics of the Wi-SUN FAN in the media access control layer and verified that the introduction of the OFDM is effective for improving the maximum system throughput by 1.9 times when performing frequency hopping.
{"title":"Wi-SUN FAN Multi-hop Network in Coexistence of IEEE 802.15.4 FSK and OFDM Transmission Schemes","authors":"Hidetomo Ochiai, K. Mizutani, H. Harada","doi":"10.1109/wpmc52694.2021.9700449","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700449","url":null,"abstract":"The wireless smart ubiquitous network field area network (Wi-SUN FAN) is a wireless communication standard for the Internet of things (IoT) in outdoor large-scale multi-hop networks. Currently, frequency shift keying (FSK) standardized in IEEE 802.15.4 is employed as the physical layer of the Wi-SUN FAN. Improving data rate of the physical layer is essential to realize expected requirements toward the next-generation IoT systems. In this paper, we introduce the orthogonal frequency division multiplexing (OFDM) standardized in IEEE 802.15.4 into the Wi-SUN FAN to improve data rate without increasing the system bandwidth. We evaluated the packet error rate (PER) characteristics under inter-signal interference in the transition period of the physical layer from FSK to OFDM through a computer simulation. Results showed that the new interference caused by the mixture of OFDM degraded the PER characteristics, in comparison with the interference between FSKs. However, the interference between different channels was limited because the required carrier-to-interference power ratio to achieve PER=10% was below –10dB. Furthermore, we evaluated the transmission characteristics of the Wi-SUN FAN in the media access control layer and verified that the introduction of the OFDM is effective for improving the maximum system throughput by 1.9 times when performing frequency hopping.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128754632","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700470
G. Miriyala, V. V. Mani
Recently, orthogonal frequency division multiplexing (OFDM) based visible light communication (VLC) technology gaining more attention due to its advantages, namely, high data rates, unlimited bandwidth and radio frequency interference-free. However, a high peak to average power ratio (PAPR) resulting in clipping distortion at the front end light-emitting diode (LED), and it is the major issue in the DC-biased optical-OFDM (DCOOFDM). In this work, we proposed a PAPR reduction technique called peak sample detection and appending (PSDA) algorithm for DCO-OFDM systems for VLC. In the PSDA algorithm, a maximum peak sample can be found and utilized to increase the average power, which results in PAPR reduction. The simulation results show that the proposed PSDA outperforms the selective mapping (SLM) and top samples detection and appending (TSDA) schemes in terms of PAPR performance. Further, the computational complexity of the proposed PSDA and TSDA are the same, whereas substantially decreased when compared to SLM. Moreover, the side-information is not required in PSDA and TSDA, unlike SLM.
{"title":"Peak Sample Detection based PAPR Reduction Algorithm in Optical-OFDM for VLC Systems","authors":"G. Miriyala, V. V. Mani","doi":"10.1109/wpmc52694.2021.9700470","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700470","url":null,"abstract":"Recently, orthogonal frequency division multiplexing (OFDM) based visible light communication (VLC) technology gaining more attention due to its advantages, namely, high data rates, unlimited bandwidth and radio frequency interference-free. However, a high peak to average power ratio (PAPR) resulting in clipping distortion at the front end light-emitting diode (LED), and it is the major issue in the DC-biased optical-OFDM (DCOOFDM). In this work, we proposed a PAPR reduction technique called peak sample detection and appending (PSDA) algorithm for DCO-OFDM systems for VLC. In the PSDA algorithm, a maximum peak sample can be found and utilized to increase the average power, which results in PAPR reduction. The simulation results show that the proposed PSDA outperforms the selective mapping (SLM) and top samples detection and appending (TSDA) schemes in terms of PAPR performance. Further, the computational complexity of the proposed PSDA and TSDA are the same, whereas substantially decreased when compared to SLM. Moreover, the side-information is not required in PSDA and TSDA, unlike SLM.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127226499","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700465
T. Osuga, Taketoshi Nakajima, S. Itaya, T. Matsumura
Recently, the demand for utilizing wireless communication such as Wi-Fi is growing in manufacturing sites because Internet of Things (IoT) and wireless robots are becoming important for improving productivity with factory automation. On the other hand, when too many wireless tools are introduced, communication performance is degraded due to mutual interferences, resulting in less productivity. Thus, for improving productivity, it is important to know how many wireless tools can be stably introduced. To accommodate this demand, we investigate the capacity of radio communication (denoted by wireless capacity) required for wireless tools in manufacturing sites. In this paper, we show a simple but practical calculation method and results obtained by using captured data in a factory.
{"title":"Wireless Capacity Calculation Method for Manufacturing Tools","authors":"T. Osuga, Taketoshi Nakajima, S. Itaya, T. Matsumura","doi":"10.1109/wpmc52694.2021.9700465","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700465","url":null,"abstract":"Recently, the demand for utilizing wireless communication such as Wi-Fi is growing in manufacturing sites because Internet of Things (IoT) and wireless robots are becoming important for improving productivity with factory automation. On the other hand, when too many wireless tools are introduced, communication performance is degraded due to mutual interferences, resulting in less productivity. Thus, for improving productivity, it is important to know how many wireless tools can be stably introduced. To accommodate this demand, we investigate the capacity of radio communication (denoted by wireless capacity) required for wireless tools in manufacturing sites. In this paper, we show a simple but practical calculation method and results obtained by using captured data in a factory.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126856435","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700446
M. Fujii, Naoki Tsuji, Shigemi Masuda
A microwave beam radiation control scheme is described for an on-vehicle vision-sensing microwave power transfer system to provide sufficient power supply while curtailing reflected wave spreads. Multiple receive antennas are mounted with a narrow interval on an inner side wall of a tunnel. These Rx antenna targets can be observed from the vehicle moving at high speed as sequentially passing targets with a short time interval. These targets are detected and tracked within a narrow angle range centered at the direction of the maximum achievable power transfer efficiency. By limiting the microwave incidence angle to near the vertical direction, microwave absorbers installed around the targets are expected to maximally reduce interference to existing wireless systems in adjacent frequency bands. Simulation results demonstrated that our proposed scheme achieved a larger amount of wirelessly transferred energy than a conventional wide-angle beam tracking scheme for a single target and that the radio field strengths were dramatically decreased in the surrounding area of the power supply spot.
{"title":"Narrow Angle Range Radiation Control Scheme for Reflected Wave Reduction in Wirelessly Powered Structural Health Monitoring","authors":"M. Fujii, Naoki Tsuji, Shigemi Masuda","doi":"10.1109/wpmc52694.2021.9700446","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700446","url":null,"abstract":"A microwave beam radiation control scheme is described for an on-vehicle vision-sensing microwave power transfer system to provide sufficient power supply while curtailing reflected wave spreads. Multiple receive antennas are mounted with a narrow interval on an inner side wall of a tunnel. These Rx antenna targets can be observed from the vehicle moving at high speed as sequentially passing targets with a short time interval. These targets are detected and tracked within a narrow angle range centered at the direction of the maximum achievable power transfer efficiency. By limiting the microwave incidence angle to near the vertical direction, microwave absorbers installed around the targets are expected to maximally reduce interference to existing wireless systems in adjacent frequency bands. Simulation results demonstrated that our proposed scheme achieved a larger amount of wirelessly transferred energy than a conventional wide-angle beam tracking scheme for a single target and that the radio field strengths were dramatically decreased in the surrounding area of the power supply spot.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126232009","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700452
T. Okura, H. Tsuji, R. Miura, T. Kan, T. Matsuda, M. Toyoshima, J. Suzuki, Y. Kishiyama
At a time when expectations are high for the rapid realization of broadband communications using HAPS (High-Altitude Platform Station), which can secure redundant routes over the sky, international movement toward commercialization is accelerating, environmental improvement and technological development are advancing, and their popularization is expected to expand. On the other hand, it is necessary to develop a radio system capable of providing high-speed and high-capacity circuits by using the wide-band frequency of the millimeter wave band (Q/V band) using HAPS, and to realize the improvement of frequency utilization efficiency in the millimeter wave band and the practical application of HAPS system. For this purpose, it is necessary to establish a frequency sharing technology to reduce the effect of radio interference with terrestrial mobile communication systems and to realize efficient use of frequencies. In this paper, as one of the research and development of three dimensional non-terrestrial communication network (NTN) using HAPS, the research result of lens antenna of the 38 GHz band ground station antenna system for HAPS is shown.
{"title":"Prototype Evaluation of the 38GHz-band Lens Antenna for High Altitude Platform Station (HAPS) Ground Station System","authors":"T. Okura, H. Tsuji, R. Miura, T. Kan, T. Matsuda, M. Toyoshima, J. Suzuki, Y. Kishiyama","doi":"10.1109/wpmc52694.2021.9700452","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700452","url":null,"abstract":"At a time when expectations are high for the rapid realization of broadband communications using HAPS (High-Altitude Platform Station), which can secure redundant routes over the sky, international movement toward commercialization is accelerating, environmental improvement and technological development are advancing, and their popularization is expected to expand. On the other hand, it is necessary to develop a radio system capable of providing high-speed and high-capacity circuits by using the wide-band frequency of the millimeter wave band (Q/V band) using HAPS, and to realize the improvement of frequency utilization efficiency in the millimeter wave band and the practical application of HAPS system. For this purpose, it is necessary to establish a frequency sharing technology to reduce the effect of radio interference with terrestrial mobile communication systems and to realize efficient use of frequencies. In this paper, as one of the research and development of three dimensional non-terrestrial communication network (NTN) using HAPS, the research result of lens antenna of the 38 GHz band ground station antenna system for HAPS is shown.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114260956","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700462
Hikaru Kawasaki, Kazuo Ibuka, F. Kojima, T. Matsumura
This paper reports the results of the field trials using a testbed based on inter-operator Multipath TCP (MPTCP) communications in a heterogeneous mobile network that provides two subflows with different performances. While the conventional MPTCP implementation is not suitable for such a heterogeneous network due to no consideration for subflows with different performances, the MPTCP implementation in the testbed is enhanced by the state-of-the-art algorithms in congestion control and path scheduler for practical evaluations. The trial results of uplink throughput and round-trip time suggest that a combination of the congestion control and path scheduling algorithms achieves an outstanding low latency performance with a practical throughput performance.
{"title":"Field Trials of Link Aggregation System based on Multipath TCP in Heterogeneous Mobile Network","authors":"Hikaru Kawasaki, Kazuo Ibuka, F. Kojima, T. Matsumura","doi":"10.1109/wpmc52694.2021.9700462","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700462","url":null,"abstract":"This paper reports the results of the field trials using a testbed based on inter-operator Multipath TCP (MPTCP) communications in a heterogeneous mobile network that provides two subflows with different performances. While the conventional MPTCP implementation is not suitable for such a heterogeneous network due to no consideration for subflows with different performances, the MPTCP implementation in the testbed is enhanced by the state-of-the-art algorithms in congestion control and path scheduler for practical evaluations. The trial results of uplink throughput and round-trip time suggest that a combination of the congestion control and path scheduling algorithms achieves an outstanding low latency performance with a practical throughput performance.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114472487","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700418
Masahiro Asano, Tatsuya Abe, Manabu Nakamura
In this paper, we propose a “UAV flight support communication system” that enables flights of UAVs over people beyond visual line of sight. After that, we will report the research results of the adaptive inter-network handover system applied to the proposed system. In conventional communication systems for UAVs, it is common for the pilot and UAV to communicate directly with each other via a single wireless line. Therefore, when operating a UAV using such a communication system, the UAV’s flight range is limited to short distances that allow good wireless communication. In addition, because of the dependence on a single radio communication system, it is difficult to respond to changes in the radio wave environment, making it necessary to improve the reliability of wireless communication for safe UAV operation. This research aims to solve these problems. By using multiple wireless networks simultaneously (multi-route transmission) and performing handover control based on the Make-before-Break procedure, the developed wireless communication system can realize a highly reliable wireless connection between UAVs and ground control stations over a wide area.
{"title":"Development of Adaptive Inter-Network Handover Scheme for Flights of UAVs over People beyond Visual Line of Sight","authors":"Masahiro Asano, Tatsuya Abe, Manabu Nakamura","doi":"10.1109/wpmc52694.2021.9700418","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700418","url":null,"abstract":"In this paper, we propose a “UAV flight support communication system” that enables flights of UAVs over people beyond visual line of sight. After that, we will report the research results of the adaptive inter-network handover system applied to the proposed system. In conventional communication systems for UAVs, it is common for the pilot and UAV to communicate directly with each other via a single wireless line. Therefore, when operating a UAV using such a communication system, the UAV’s flight range is limited to short distances that allow good wireless communication. In addition, because of the dependence on a single radio communication system, it is difficult to respond to changes in the radio wave environment, making it necessary to improve the reliability of wireless communication for safe UAV operation. This research aims to solve these problems. By using multiple wireless networks simultaneously (multi-route transmission) and performing handover control based on the Make-before-Break procedure, the developed wireless communication system can realize a highly reliable wireless connection between UAVs and ground control stations over a wide area.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123232270","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 : 2021-12-14DOI: 10.1109/wpmc52694.2021.9700438
Wei-Shun Liao, Ou Zhao, Keren Li, T. Matsumura, F. Kojima, H. Harada
For beyond 5G wireless communication systems, in-band full-duplex (IBFD) is one of the important candidate technologies due to its capacity and low latency transmissions. However, for IBFD systems, the base station performs uplink (UL) and downlink (DL) processes simultaneously, and hence the system suffers from severe self-interference (SI) because of the simultaneous UL and DL communications. Therefore, to realize the IBFD system, it is necessary to suppress the SI problem. For suppressing SI, adaptive filter could be considered as one of the candidate digital interference cancellation technology. However, using adaptive filter needs to make sure that the adaptive filter is working in convergence status. Therefore, in this paper we propose a novel method to automatically detect if the adaptive filter enters convergence status so that it can make sure that the SI is always optimally suppressed in the system by the adaptive filter. By conducting computer simulations, it can be seen that the proposed method can effectively detect the convergence point of the adaptive filter and provide output with optimally suppressed SI, so that the resultant BER performance of the IBFD system can very closely approach the optimal case without SI, which validates the effectiveness of the proposed method.
{"title":"Automatic Convergence Detection for In-Band Full-Duplex System with Digital Self-Interference Cancellation Using Adaptive Filter","authors":"Wei-Shun Liao, Ou Zhao, Keren Li, T. Matsumura, F. Kojima, H. Harada","doi":"10.1109/wpmc52694.2021.9700438","DOIUrl":"https://doi.org/10.1109/wpmc52694.2021.9700438","url":null,"abstract":"For beyond 5G wireless communication systems, in-band full-duplex (IBFD) is one of the important candidate technologies due to its capacity and low latency transmissions. However, for IBFD systems, the base station performs uplink (UL) and downlink (DL) processes simultaneously, and hence the system suffers from severe self-interference (SI) because of the simultaneous UL and DL communications. Therefore, to realize the IBFD system, it is necessary to suppress the SI problem. For suppressing SI, adaptive filter could be considered as one of the candidate digital interference cancellation technology. However, using adaptive filter needs to make sure that the adaptive filter is working in convergence status. Therefore, in this paper we propose a novel method to automatically detect if the adaptive filter enters convergence status so that it can make sure that the SI is always optimally suppressed in the system by the adaptive filter. By conducting computer simulations, it can be seen that the proposed method can effectively detect the convergence point of the adaptive filter and provide output with optimally suppressed SI, so that the resultant BER performance of the IBFD system can very closely approach the optimal case without SI, which validates the effectiveness of the proposed method.","PeriodicalId":299827,"journal":{"name":"2021 24th International Symposium on Wireless Personal Multimedia Communications (WPMC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127079216","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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