Motivated by the future scenarios of ultra- reliability and low latency communications (URLLC) and integrated access and backhaul (IAB) that are currently discussed in 3GPP, we propose a novel parallelogram-structured constellation design based on minimum distance (MD) criterion for powerdomain uplink NOMA system. In comparison with previous work, which maximizes MD of the superimposition of the usual constellations, such as QPSK and 16 QAM, by inter-constellation rotation, the incorporation of parallelogram- structure into the NOMA constellation design can achieve a much better MD. Since the proposed constellations can be parameterized as a function of the power ratio î±, the signaling overhead for a base station to designate the constellations to be used by each user equipment is minimized. Simulation results show that our proposed constellation design can further improve the symbol error rate, as well as the achievable rate, of the inter-constellation-rotated superposition of usual square constellations.
{"title":"A Minimum Distance Criterion Based Constellation Design for Uplink NOMA","authors":"Hsuan-Po Liu, Shin-Lin Shieh, Chia-Hung Lin, Po-Ning Chen","doi":"10.1109/VTCFall.2019.8891372","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891372","url":null,"abstract":"Motivated by the future scenarios of ultra- reliability and low latency communications (URLLC) and integrated access and backhaul (IAB) that are currently discussed in 3GPP, we propose a novel parallelogram-structured constellation design based on minimum distance (MD) criterion for powerdomain uplink NOMA system. In comparison with previous work, which maximizes MD of the superimposition of the usual constellations, such as QPSK and 16 QAM, by inter-constellation rotation, the incorporation of parallelogram- structure into the NOMA constellation design can achieve a much better MD. Since the proposed constellations can be parameterized as a function of the power ratio î±, the signaling overhead for a base station to designate the constellations to be used by each user equipment is minimized. Simulation results show that our proposed constellation design can further improve the symbol error rate, as well as the achievable rate, of the inter-constellation-rotated superposition of usual square constellations.","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":"76290735","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.2019.8891456
Wen-Che Chang, T. Chang, Y. Su
In this paper, we establish a connection between length-compatible (LC) punctured/shortened polar codes and compound polar codes. Regarding an LC code as a compound code to be transmitted over two different channels, we propose four channel-coded bit mapping rules which generalize some known LC code constructing methods. Performance of the punctured and shortened codes constructed by applying different mapping rules can thus be predicted checking if the Bhattacharyya bound is minimized.
{"title":"Design of Length-Compatible Polar Codes: A Compound Polar Code's Perspective","authors":"Wen-Che Chang, T. Chang, Y. Su","doi":"10.1109/VTCFall.2019.8891456","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891456","url":null,"abstract":"In this paper, we establish a connection between length-compatible (LC) punctured/shortened polar codes and compound polar codes. Regarding an LC code as a compound code to be transmitted over two different channels, we propose four channel-coded bit mapping rules which generalize some known LC code constructing methods. Performance of the punctured and shortened codes constructed by applying different mapping rules can thus be predicted checking if the Bhattacharyya bound is minimized.","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":"72943292","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.2019.8891094
Thomas Deinlein, R. German, Anatoli Djanatliev
Vehicle-to-Infrastructure (V2I) via mobile communication technologies such as Long Term Evolution (LTE) or 5G NR (New Radio) is a current research topic. In the context of the vision of autonomous driving many stakeholders are interested in the capabilities and shortcomings of these technologies. Several simulation frameworks are available which can be used for evaluation in large traffic scenarios. Especially the channel model used on the physical layer is of interest, because it is crucial for the assessment whether messages could be exchanged successfully. In this paper we look into the framework SimuLTE and its provided 4G channel models taken from International Telecommunication Union (ITU) guidelines (M.2135) and compare it with the latest corresponding ITU-guidelines (M.2412) for 5G NR simulating two sample scenarios and analyzing the different outcomes.
{"title":"Simulative Comparison of 4G/5G ITU Channel Models in the Context of V2I","authors":"Thomas Deinlein, R. German, Anatoli Djanatliev","doi":"10.1109/VTCFall.2019.8891094","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891094","url":null,"abstract":"Vehicle-to-Infrastructure (V2I) via mobile communication technologies such as Long Term Evolution (LTE) or 5G NR (New Radio) is a current research topic. In the context of the vision of autonomous driving many stakeholders are interested in the capabilities and shortcomings of these technologies. Several simulation frameworks are available which can be used for evaluation in large traffic scenarios. Especially the channel model used on the physical layer is of interest, because it is crucial for the assessment whether messages could be exchanged successfully. In this paper we look into the framework SimuLTE and its provided 4G channel models taken from International Telecommunication Union (ITU) guidelines (M.2135) and compare it with the latest corresponding ITU-guidelines (M.2412) for 5G NR simulating two sample scenarios and analyzing the different outcomes.","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":"74268596","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}
Antenna arrays can enhance the directivity and save the transmission power of a communication system. Beam pattern optimization for reducing the maximum sidelobe level (SLL) is a classical electromagnetic problem in antenna arrays. In this paper, a novel improved chicken swarm optimization (ICSO) algorithm is proposed to suppress the maximum SLL of the linear antenna array (LAA), the circular antenna array (CAA) and the random antenna array (RAA). Three improved factors that are the global search, the weighting and the local search factors are introduced into the update method of the roosters, the hens and the chicks of the conventional chicken swarm optimization (CSO), respectively, to achieve better optimization results. Simulations are conducted to verify the performance of the proposed ICSO for suppressing the maximum SLL, and the results show that the proposed ICSO can obtain lower maximum SLL in LAA, CAA and RAA cases compared with several benchmark algorithms. Moreover, the stability of ICSO is evaluated and the results show that it outperforms the other algorithms.
{"title":"A Modified Chicken Swarm Optimization Algorithm for Synthesizing Linear, Circular and Random Antenna Arrays","authors":"Geng Sun, Xiaohui Zhao, Shuang Liang, Yanheng Liu, Xu Zhou, Ying Zhang","doi":"10.1109/VTCFall.2019.8891515","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891515","url":null,"abstract":"Antenna arrays can enhance the directivity and save the transmission power of a communication system. Beam pattern optimization for reducing the maximum sidelobe level (SLL) is a classical electromagnetic problem in antenna arrays. In this paper, a novel improved chicken swarm optimization (ICSO) algorithm is proposed to suppress the maximum SLL of the linear antenna array (LAA), the circular antenna array (CAA) and the random antenna array (RAA). Three improved factors that are the global search, the weighting and the local search factors are introduced into the update method of the roosters, the hens and the chicks of the conventional chicken swarm optimization (CSO), respectively, to achieve better optimization results. Simulations are conducted to verify the performance of the proposed ICSO for suppressing the maximum SLL, and the results show that the proposed ICSO can obtain lower maximum SLL in LAA, CAA and RAA cases compared with several benchmark algorithms. Moreover, the stability of ICSO is evaluated and the results show that it outperforms the other algorithms.","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":"74632917","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.2019.8891366
T. Matsumura, Kazuo Ibuka, H. Murakami, K. Ishizu, F. Kojima
Since IEEE 802.11af was standardized in 2013 as one of the standards for TVWS (TV white-spaces) communication, a variety of radio devices such as a high-power radio device al-lowing a transmission power of 1 W and a dongle-type com-pact radio device have been prototyped and demonstrated in field experiments. Meanwhile, since all the reported prototypes were limited to a single channel operation with a channel bandwidth of 6 MHz, achieved throughput was inferior to the commercialized WLAN (Wireless Local Area Network) systems with a channel bandwidth of 20 MHz or more. In this paper, to enhance the throughput of the IEEE 802.11af system, we de-sign and prototype a radio device based on IEEE 802.11af with a channel aggregation function. In addition, we evaluate fun-damental characteristics of the prototype radio device including radio performance and throughput.
{"title":"Implementation and Performance Evaluation of IEEE 802.11af Channel Aggregation","authors":"T. Matsumura, Kazuo Ibuka, H. Murakami, K. Ishizu, F. Kojima","doi":"10.1109/VTCFall.2019.8891366","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891366","url":null,"abstract":"Since IEEE 802.11af was standardized in 2013 as one of the standards for TVWS (TV white-spaces) communication, a variety of radio devices such as a high-power radio device al-lowing a transmission power of 1 W and a dongle-type com-pact radio device have been prototyped and demonstrated in field experiments. Meanwhile, since all the reported prototypes were limited to a single channel operation with a channel bandwidth of 6 MHz, achieved throughput was inferior to the commercialized WLAN (Wireless Local Area Network) systems with a channel bandwidth of 20 MHz or more. In this paper, to enhance the throughput of the IEEE 802.11af system, we de-sign and prototype a radio device based on IEEE 802.11af with a channel aggregation function. In addition, we evaluate fun-damental characteristics of the prototype radio device including radio performance and throughput.","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":"73872038","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.2019.8891233
D. Michelson, Hamed Noori, Quinn Ramsay
Recent proposals to permit Wi-Fi to share the 5.9 GHz spectrum currently reserved exclusively for Dedicated Short Range Communications (DSRC) have elicited strong reactions from both the wireless and connected vehicle communities. A variety of lab-based studies and simulation-based investigations have been conducted in an attempt to resolve the issue but the results have not resolved the issue. One possible solution is to provide DSRC networks with the capability to detect and report interference to a central authority so that appropriate action can be taken by Wi-Fi operators or spectrum regulators to resolve the issue. Here we propose and demonstrate that interference to DSRC networks can be detected simply and inexpensively using capabilities already incorporated into the IEEE 802.11p standard. We further propose that a simple and inexpensive method for reporting interference to DSRC networks would be to clone a second instance of the subsystem used to report untrustworthy digital certificates within the DSRC Security Credential Management System (SCMS) and deliver reports of possible interference events to a Spectrum Misbehavior Authority. Such a combined capability would resolve a longstanding but underappreciated concern that DSRC networks are vulnerable to a variety of short-range interferers but lack the capability to detect or report same. Although our focus is on DSRC, similar considerations apply to related schemes such as C-V2X.
{"title":"Interference Detection and Reporting in IEEE 802.11p Connected Vehicle Networks","authors":"D. Michelson, Hamed Noori, Quinn Ramsay","doi":"10.1109/VTCFall.2019.8891233","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891233","url":null,"abstract":"Recent proposals to permit Wi-Fi to share the 5.9 GHz spectrum currently reserved exclusively for Dedicated Short Range Communications (DSRC) have elicited strong reactions from both the wireless and connected vehicle communities. A variety of lab-based studies and simulation-based investigations have been conducted in an attempt to resolve the issue but the results have not resolved the issue. One possible solution is to provide DSRC networks with the capability to detect and report interference to a central authority so that appropriate action can be taken by Wi-Fi operators or spectrum regulators to resolve the issue. Here we propose and demonstrate that interference to DSRC networks can be detected simply and inexpensively using capabilities already incorporated into the IEEE 802.11p standard. We further propose that a simple and inexpensive method for reporting interference to DSRC networks would be to clone a second instance of the subsystem used to report untrustworthy digital certificates within the DSRC Security Credential Management System (SCMS) and deliver reports of possible interference events to a Spectrum Misbehavior Authority. Such a combined capability would resolve a longstanding but underappreciated concern that DSRC networks are vulnerable to a variety of short-range interferers but lack the capability to detect or report same. Although our focus is on DSRC, similar considerations apply to related schemes such as C-V2X.","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":"73885219","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.2019.8891321
Yu Nakayama, D. Hisano, T. Nishio, K. Maruta
The centralized radio access network (C-RAN) architecture prevails in beyond 5G mobile networks. Along with the cell size reduction, the efficiency of C-RAN architecture is drastically deteriorated by the spatio-temporal fluctuations in mobile traffic demand. To address this problem, we proposed a concept of adaptive C-RAN architecture for smart cities with crowdsourced radio units (CRUs). The advantages of the proposed scheme are high flexibility and low cost, because the distribution of CRUs follows that of mobile users. This paper introduces the experimental results on the performance of radio units mounted on parked vehicles to show the efficacy of the proposed scheme.
{"title":"Experimental Results on Crowdsourced Radio Units Mounted on Parked Vehicles","authors":"Yu Nakayama, D. Hisano, T. Nishio, K. Maruta","doi":"10.1109/VTCFall.2019.8891321","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891321","url":null,"abstract":"The centralized radio access network (C-RAN) architecture prevails in beyond 5G mobile networks. Along with the cell size reduction, the efficiency of C-RAN architecture is drastically deteriorated by the spatio-temporal fluctuations in mobile traffic demand. To address this problem, we proposed a concept of adaptive C-RAN architecture for smart cities with crowdsourced radio units (CRUs). The advantages of the proposed scheme are high flexibility and low cost, because the distribution of CRUs follows that of mobile users. This paper introduces the experimental results on the performance of radio units mounted on parked vehicles to show the efficacy of the proposed scheme.","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":"84460586","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.2019.8891217
Lianqin Li, Kecheng Zhang, J. Jiao, Yunyu Sun, Shaohua Wu, Ye Wang, Qinyu Zhang
Raptor code is the current standard of 4G long term evolution (LTE) evolved multimedia broadcast and multi-cast services (eMBMS), which is viewed as a potential approach in the design of ultra-reliable low latency communications (uRLLC) for 5G. This paper analyzes the performance of finite length non-binary (over finite field of order q, GF(q)) Raptor codes under ordered statistics decoder (OSD) towards uRLLC, where the non-binary Raptor code ensembles by a non-binary low density parity-check (LDPC) code as pre-code and a non-binary inner Luby transform (LT) code. Moreover, by investigating the property of code structure and decoding algorithm, an upper bound of decoding failure probability (DFP) of finite length non-binary Raptor code under OSD is derived. Simulation results validate the accuracy of our derived upper bound, and demonstrate that our non-binary Raptor codes can achieve 10â'5 DFP with block length 128 bits at SNR 3.6 dB.
{"title":"Performance Analysis of Finite Length Non-Binary Raptor Codes under Ordered Statistics Decoder","authors":"Lianqin Li, Kecheng Zhang, J. Jiao, Yunyu Sun, Shaohua Wu, Ye Wang, Qinyu Zhang","doi":"10.1109/VTCFall.2019.8891217","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891217","url":null,"abstract":"Raptor code is the current standard of 4G long term evolution (LTE) evolved multimedia broadcast and multi-cast services (eMBMS), which is viewed as a potential approach in the design of ultra-reliable low latency communications (uRLLC) for 5G. This paper analyzes the performance of finite length non-binary (over finite field of order q, GF(q)) Raptor codes under ordered statistics decoder (OSD) towards uRLLC, where the non-binary Raptor code ensembles by a non-binary low density parity-check (LDPC) code as pre-code and a non-binary inner Luby transform (LT) code. Moreover, by investigating the property of code structure and decoding algorithm, an upper bound of decoding failure probability (DFP) of finite length non-binary Raptor code under OSD is derived. Simulation results validate the accuracy of our derived upper bound, and demonstrate that our non-binary Raptor codes can achieve 10â'5 DFP with block length 128 bits at SNR 3.6 dB.","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":"81675287","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.2019.8891418
Chun-Hung Liu, Di-Chun Liang, Rung-Hung Gau
This paper aims to study how to achieve high transmission security in the physical (PHY) layer of a multi-tier heterogeneous network (HetNet) through a simple device-to- device (D2D) enabling scheme. For the HetNet, we propose a simple D2D-enabling scheme with low complexity for users to opportunistically enable their D2D mode and become either D2D or cellular users by exploiting the diversity of all user association signals from all base stations (BSs). To evaluate whether the proposed D2D enabling scheme improves the PHY-layer security of the HetNet, the secrecy outage probability of the HetNet is defined and analyzed from two different perspectives of BSs and users. We define the BS- centric and user-centric security outage events and derive the explicit lower bound on their probability when the proposed D2D enabling scheme is adopted. Our analytical and numerical results not only show that the proposed D2D-enabling scheme can achieve high PHY-layer security but also reveal how densely the BSs should be deployed in the HetNet in order to achieve the high PHY-layer security from the perspectives of BSs and users.
{"title":"On Achieving High PHY-Layer Security of D2D-Enabled Heterogeneous Networks","authors":"Chun-Hung Liu, Di-Chun Liang, Rung-Hung Gau","doi":"10.1109/VTCFall.2019.8891418","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891418","url":null,"abstract":"This paper aims to study how to achieve high transmission security in the physical (PHY) layer of a multi-tier heterogeneous network (HetNet) through a simple device-to- device (D2D) enabling scheme. For the HetNet, we propose a simple D2D-enabling scheme with low complexity for users to opportunistically enable their D2D mode and become either D2D or cellular users by exploiting the diversity of all user association signals from all base stations (BSs). To evaluate whether the proposed D2D enabling scheme improves the PHY-layer security of the HetNet, the secrecy outage probability of the HetNet is defined and analyzed from two different perspectives of BSs and users. We define the BS- centric and user-centric security outage events and derive the explicit lower bound on their probability when the proposed D2D enabling scheme is adopted. Our analytical and numerical results not only show that the proposed D2D-enabling scheme can achieve high PHY-layer security but also reveal how densely the BSs should be deployed in the HetNet in order to achieve the high PHY-layer security from the perspectives of BSs and users.","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":"79670785","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.2019.8891388
Tomohiro Kikuma, Takuji Mochizuki, Masashi Hirabe, M. Hayakawa, Daisuke Nose
Massive multi input and multi output (MIMO) for use in 5th Generation (5G) radio access network (RAN) systems has drawn attention as a key technology. Our research focuses on utilizing massive MIMO as an active antenna system (AAS) in the low super-high-frequency (SHF) band, which is expected to be used for 5G commercial bands relatively soon, and on enhancing spectrum efficiency by spatial multiplexing. In this paper, we introduce our latest developed massive MIMO system which has flexible AAS unit configuration, a newly embedded high-performance digital pre-distortion (DPD) scheme to maintain high signal quality even in the high transmission power range, and improves the spatial multiplexing performance of two AAS units (128 antenna elements) by comparison with that of one AAS unit (64 antenna elements). We evaluate downlink (DL) multi-user (MU) MIMO performance in an anechoic chamber, connecting up to a maximum of eight user equipment (UEs) with 16 layers, with two different dense UE allocation scenarios. From the results, we confirmed a greater performance improvement for two AAS units, particularly in the case of the "congested" eight UEs allocation scenario, where the DL SINR reaches 22.9 dB, which has a 4.5 dB gain compared to the DPD-disabled case and a 14.9 dB gain compared to one AAS unit with the DPD-enabled case, respectively. We also confirmed that the developed massive MIMO system can optimize the performance with minimum configuration of AAS units, appropriately according to the environment.
{"title":"Experimental Validation of Massive MIMO Linearity Enhancement with DPD in Low-SHF-Band for 5G","authors":"Tomohiro Kikuma, Takuji Mochizuki, Masashi Hirabe, M. Hayakawa, Daisuke Nose","doi":"10.1109/VTCFall.2019.8891388","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891388","url":null,"abstract":"Massive multi input and multi output (MIMO) for use in 5th Generation (5G) radio access network (RAN) systems has drawn attention as a key technology. Our research focuses on utilizing massive MIMO as an active antenna system (AAS) in the low super-high-frequency (SHF) band, which is expected to be used for 5G commercial bands relatively soon, and on enhancing spectrum efficiency by spatial multiplexing. In this paper, we introduce our latest developed massive MIMO system which has flexible AAS unit configuration, a newly embedded high-performance digital pre-distortion (DPD) scheme to maintain high signal quality even in the high transmission power range, and improves the spatial multiplexing performance of two AAS units (128 antenna elements) by comparison with that of one AAS unit (64 antenna elements). We evaluate downlink (DL) multi-user (MU) MIMO performance in an anechoic chamber, connecting up to a maximum of eight user equipment (UEs) with 16 layers, with two different dense UE allocation scenarios. From the results, we confirmed a greater performance improvement for two AAS units, particularly in the case of the \"congested\" eight UEs allocation scenario, where the DL SINR reaches 22.9 dB, which has a 4.5 dB gain compared to the DPD-disabled case and a 14.9 dB gain compared to one AAS unit with the DPD-enabled case, respectively. We also confirmed that the developed massive MIMO system can optimize the performance with minimum configuration of AAS units, appropriately according to the environment.","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":"84669951","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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