Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8287897
Zhiyuan Lin, Wei Chen
In order to achieve high spectral efficiency, considerable attention has been paid to full-duplex (FD) and non-orthogonal multiple access (NOMA) technologies in the past decades. When FD users and half-duplex (HD) users access to the base station simultaneously, however, the rate region is still unknown. In this paper, we investigate hybrid NOMA (H-NOMA) systems, where a multi-antenna FD base station serves both a FD user and a HD uplink user over the same frequency band. The base station adopts successive interference cancellation (SIC) to decode the uplink signals, while the FD user is capable of adopting SIC to decode and cancel the inter-user interference. Given fixed transmission power, the achievable rate region of the H-NOMA system is the convex hull of the union of the rate regions of two alternative schemes with and without SIC at the FD user. Specifically, we derive the explicit expression of the rate region and demonstrate the potential of the proposed switching methods via numerical results.
{"title":"Hybrid Nonorthogonal Multiple Access with Half and Full Duplex Cooperative Users","authors":"Zhiyuan Lin, Wei Chen","doi":"10.1109/VTCFall.2017.8287897","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8287897","url":null,"abstract":"In order to achieve high spectral efficiency, considerable attention has been paid to full-duplex (FD) and non-orthogonal multiple access (NOMA) technologies in the past decades. When FD users and half-duplex (HD) users access to the base station simultaneously, however, the rate region is still unknown. In this paper, we investigate hybrid NOMA (H-NOMA) systems, where a multi-antenna FD base station serves both a FD user and a HD uplink user over the same frequency band. The base station adopts successive interference cancellation (SIC) to decode the uplink signals, while the FD user is capable of adopting SIC to decode and cancel the inter-user interference. Given fixed transmission power, the achievable rate region of the H-NOMA system is the convex hull of the union of the rate regions of two alternative schemes with and without SIC at the FD user. Specifically, we derive the explicit expression of the rate region and demonstrate the potential of the proposed switching methods via numerical results.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131283729","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288135
Afonso Ferreira, Guilherme Gaspar, P. Montezuma, R. Dinis, D. Jayakody
Next generation of mobile communication systems must support astounding data traffic increases, higher data rates and lower latency, among other requirements. All these requirements should be met while assuring energy efficiency for mobile devices and base stations. Most likely, the future 5G systems will include massive MIMO (Multiple Input Multiple Output) schemes with dozen or hundreds of antennas enabling beamforming while operating in the millimeter wave spectrum. As soon as the millimetric wave propagation difficulties are overcome, the full potential of massive MIMO structures can be tapped. This paper presents a transmission system with bi-dimensional antenna arrays, based on a double layer structure combining beamforming with a multi-branch power amplification that achieves simultaneously power efficiency in amplification of multilevel constellations without penalties on system performance when compared with common schemes using only beamforming.
{"title":"A Power Efficient Technique for Double Layer Massive MIMO Schemes","authors":"Afonso Ferreira, Guilherme Gaspar, P. Montezuma, R. Dinis, D. Jayakody","doi":"10.1109/VTCFall.2017.8288135","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288135","url":null,"abstract":"Next generation of mobile communication systems must support astounding data traffic increases, higher data rates and lower latency, among other requirements. All these requirements should be met while assuring energy efficiency for mobile devices and base stations. Most likely, the future 5G systems will include massive MIMO (Multiple Input Multiple Output) schemes with dozen or hundreds of antennas enabling beamforming while operating in the millimeter wave spectrum. As soon as the millimetric wave propagation difficulties are overcome, the full potential of massive MIMO structures can be tapped. This paper presents a transmission system with bi-dimensional antenna arrays, based on a double layer structure combining beamforming with a multi-branch power amplification that achieves simultaneously power efficiency in amplification of multilevel constellations without penalties on system performance when compared with common schemes using only beamforming.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131289016","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288048
T. Kolding, L. Chavarria, K. Pedersen
Radio networks are at the brink of a transformation in order to meet new requirements for high data and device densities expected for the Internet-of-Things (IoT) era. Cloud technology is positioned to be a key element in building effective 5G radio networks, so-called Cloud RANs. In this paper, we focus on Cloud RAN architectural benefits in relation to synchronous handovers without random access; an important enabler for ultra-low latency and ultra-high reliability services for high mobility IoT applications. We analyze the performance of Cloud RAN architectures and introduce a new concept for reducing the handover preparation time. Compared to today's distributed RAN architectures, we show a handover preparation time reduction of up to 60% for a wide range of interface and processing latency assumptions.
{"title":"Optimizing Synchronous Handover in Cloud RAN","authors":"T. Kolding, L. Chavarria, K. Pedersen","doi":"10.1109/VTCFall.2017.8288048","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288048","url":null,"abstract":"Radio networks are at the brink of a transformation in order to meet new requirements for high data and device densities expected for the Internet-of-Things (IoT) era. Cloud technology is positioned to be a key element in building effective 5G radio networks, so-called Cloud RANs. In this paper, we focus on Cloud RAN architectural benefits in relation to synchronous handovers without random access; an important enabler for ultra-low latency and ultra-high reliability services for high mobility IoT applications. We analyze the performance of Cloud RAN architectures and introduce a new concept for reducing the handover preparation time. Compared to today's distributed RAN architectures, we show a handover preparation time reduction of up to 60% for a wide range of interface and processing latency assumptions.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131293868","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288268
Torsten Lorenzen
Densities in Vehicular Ad-Hoc Networks (VANETs) are highly dynamic and the amount of information shared can easily exceed the limited resource capacity. LIMERIC, a state-of-the-art congestion control mechanism, is designed to reduce the network load by adjusting the message rate based on the current resource utilization. However, due to its fixed convergence parameters, it suffers from scalability and fails to provide stability under high densities. In this paper, I introduce Self-Weighted Rate Control (SWeRC) which achieves a scalability- independent, efficient, and fair resource allocation. I analyze the effect of the convergence parameters and subsequently introduce a parameter optimized algorithm. Based on an in-depth numerical evaluation, I investigate the performance of SWeRC and reveal optimal convergence parameters for both convergence speed and stability.
{"title":"SWeRC: Self-Weighted Semi-Cooperative DSRC Congestion Control Based on LIMERIC","authors":"Torsten Lorenzen","doi":"10.1109/VTCFall.2017.8288268","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288268","url":null,"abstract":"Densities in Vehicular Ad-Hoc Networks (VANETs) are highly dynamic and the amount of information shared can easily exceed the limited resource capacity. LIMERIC, a state-of-the-art congestion control mechanism, is designed to reduce the network load by adjusting the message rate based on the current resource utilization. However, due to its fixed convergence parameters, it suffers from scalability and fails to provide stability under high densities. In this paper, I introduce Self-Weighted Rate Control (SWeRC) which achieves a scalability- independent, efficient, and fair resource allocation. I analyze the effect of the convergence parameters and subsequently introduce a parameter optimized algorithm. Based on an in-depth numerical evaluation, I investigate the performance of SWeRC and reveal optimal convergence parameters for both convergence speed and stability.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131325294","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8287900
J. Israel, M. Ait-Ighil
This paper is focused on the characterization of a mobile Radio Frequency (RF) receiver environment. Based on fish-eye images acquired simultaneously with the RF signal, the detection of the sky, the vegetation and the close obstacles is performed. This optical environment characterization exhibits a strong correlation with the direct RF signal classification as recommended by the International Telecommunication Union (ITU).
{"title":"Land Mobile Satellite Propagation Channel Characterization Based on RF Measurements and Fish-Eye Images","authors":"J. Israel, M. Ait-Ighil","doi":"10.1109/VTCFall.2017.8287900","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8287900","url":null,"abstract":"This paper is focused on the characterization of a mobile Radio Frequency (RF) receiver environment. Based on fish-eye images acquired simultaneously with the RF signal, the detection of the sky, the vegetation and the close obstacles is performed. This optical environment characterization exhibits a strong correlation with the direct RF signal classification as recommended by the International Telecommunication Union (ITU).","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131398640","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288266
Yamen Y. Nasrallah, I. Al-Anbagi, H. Mouftah
The Enhanced Distributed Channel Access (EDCA) and the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) algorithms are used in the IEEE 802.11p standard to support Quality of Service (QoS) and reliable communication in Vehicular Ad hoc Networks (VANETs). An essential part of the CSMA/CA process is when a packet in an Access Category (AC) waits for an Arbitrary Inter- Frame Space (AIFS) period of time before engaging in the the backoff phase. According to the standard, AIFS values are fixed and deterministic, they do not guarantee strict priority for ACs especially when these values are combined with the Contention Window (CW) size of the backoff phase. On the other hand, the AIFS values are not adjustable, they do not adapt to the current status of the medium. In this paper, we propose two algorithms for AIFS value assignment, the Strict Priority Algorithm (SPA) and the Adaptive AIFS Algorithm (A3). With SPA, the AIFS values are fixed, but they are determined according to a mathematical formula that ensures strict priority level among the ACs. With A3, the AIFS values are adaptively changing depending on the value of the collision probability. AIFS still maintains a strict priority level assignment among the ACs.
{"title":"Enhanced Algorithms for the IEEE 802.11p Deployment in Vehicular Ad Hoc Networks","authors":"Yamen Y. Nasrallah, I. Al-Anbagi, H. Mouftah","doi":"10.1109/VTCFall.2017.8288266","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288266","url":null,"abstract":"The Enhanced Distributed Channel Access (EDCA) and the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) algorithms are used in the IEEE 802.11p standard to support Quality of Service (QoS) and reliable communication in Vehicular Ad hoc Networks (VANETs). An essential part of the CSMA/CA process is when a packet in an Access Category (AC) waits for an Arbitrary Inter- Frame Space (AIFS) period of time before engaging in the the backoff phase. According to the standard, AIFS values are fixed and deterministic, they do not guarantee strict priority for ACs especially when these values are combined with the Contention Window (CW) size of the backoff phase. On the other hand, the AIFS values are not adjustable, they do not adapt to the current status of the medium. In this paper, we propose two algorithms for AIFS value assignment, the Strict Priority Algorithm (SPA) and the Adaptive AIFS Algorithm (A3). With SPA, the AIFS values are fixed, but they are determined according to a mathematical formula that ensures strict priority level among the ACs. With A3, the AIFS values are adaptively changing depending on the value of the collision probability. AIFS still maintains a strict priority level assignment among the ACs.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"38 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133783014","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288013
Ramiz Sabbagh, Huiling Zhu, Jiangzhou Wang
In distributed massive multi-input multi-output (DM-MIMO) systems, orthogonal pilot sequences are generally utilized to acquire the channel state information (CSI). However, this highly restricts the number of users simultaneously served. In this paper, a pilot reuse within a single cell DM-MIMO system is proposed to serve more users than the available pilot sequences. The reuse in this strategy is applied so that maximum achievable sum-rate is satisfied with the constraint of predefined pilot resource. On this basis, two users in different subcells separated by a large distance and satisfying a specific signal to interference plus noise ratio (SINR) level can share the same pilot sequence. An expression for SINR is derived for any pair of users who use the same pilot. Based on this expression, an algorithm is proposed to choose which pairs of users are able to use the same pilot with the constraint of satisfying the minimum SINR required for these users. The simulation results demonstrate that the uplink achievable sum-rate for the proposed strategy is higher than both cases when no pilot reuse or random pilot reuse are considered.
{"title":"Pilot Allocation and Sum-Rate Analysis in Distributed Massive MIMO Systems","authors":"Ramiz Sabbagh, Huiling Zhu, Jiangzhou Wang","doi":"10.1109/VTCFall.2017.8288013","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288013","url":null,"abstract":"In distributed massive multi-input multi-output (DM-MIMO) systems, orthogonal pilot sequences are generally utilized to acquire the channel state information (CSI). However, this highly restricts the number of users simultaneously served. In this paper, a pilot reuse within a single cell DM-MIMO system is proposed to serve more users than the available pilot sequences. The reuse in this strategy is applied so that maximum achievable sum-rate is satisfied with the constraint of predefined pilot resource. On this basis, two users in different subcells separated by a large distance and satisfying a specific signal to interference plus noise ratio (SINR) level can share the same pilot sequence. An expression for SINR is derived for any pair of users who use the same pilot. Based on this expression, an algorithm is proposed to choose which pairs of users are able to use the same pilot with the constraint of satisfying the minimum SINR required for these users. The simulation results demonstrate that the uplink achievable sum-rate for the proposed strategy is higher than both cases when no pilot reuse or random pilot reuse are considered.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133851740","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288175
Hiroki Nishiyama, Y. Kawamoto, Daisuke Takaishi
Unmanned aerial vehicles (UAVs) can be used for a wide variety of applications, including agriculture, infrastructure maintenance, and disaster response. In this paper, we focus on the use of UAVs for disaster response. Multiple UAVs equipped with communication terminals can be deployed to construct an airborne network connecting isolated areas. Another use is for real-time video transmission from a UAV to a ground station, using multiple UAVs operating simultaneously by different organizations, e.g., rescue teams, fire departments, broadcasting companies, and so forth. In both cases, frequency resources must be shared efficiently among adjacent UAVs. Thus, we describe a radio resource management system for UAVs. The focus of this paper is data communications, rather than the broader issue of command and control communications. First, we present experimental results from field experiments using WiFi communication terminals that do not have centralized radio resource management functionality. Then, we propose a centralized resource allocation technique that assumes an orthogonal frequency division multiplexing (OFDM)-based communication system, using resource blocks consistent with the long-term evolution (LTE) standard.
{"title":"On OFDM-Based Resource Allocation in LTE Radio Management System for Unmanned Aerial Vehicles (UAVs)","authors":"Hiroki Nishiyama, Y. Kawamoto, Daisuke Takaishi","doi":"10.1109/VTCFall.2017.8288175","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288175","url":null,"abstract":"Unmanned aerial vehicles (UAVs) can be used for a wide variety of applications, including agriculture, infrastructure maintenance, and disaster response. In this paper, we focus on the use of UAVs for disaster response. Multiple UAVs equipped with communication terminals can be deployed to construct an airborne network connecting isolated areas. Another use is for real-time video transmission from a UAV to a ground station, using multiple UAVs operating simultaneously by different organizations, e.g., rescue teams, fire departments, broadcasting companies, and so forth. In both cases, frequency resources must be shared efficiently among adjacent UAVs. Thus, we describe a radio resource management system for UAVs. The focus of this paper is data communications, rather than the broader issue of command and control communications. First, we present experimental results from field experiments using WiFi communication terminals that do not have centralized radio resource management functionality. Then, we propose a centralized resource allocation technique that assumes an orthogonal frequency division multiplexing (OFDM)-based communication system, using resource blocks consistent with the long-term evolution (LTE) standard.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115352984","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288022
S. Payami, M. Ghoraishi, M. Dianati
In this paper, a novel hybrid precoding algorithm is proposed for the downlink of a multiantenna multiuser massive multiple-input multiple-output (MIMO) system. Firstly, a modified block diagonalization precoding technique is presented. Then, it is shown that combining the modified block diagonalization with hybrid beamforming can achieve a similar sum-rate as block diagonalization with digital beamforming can. Moreover, the performance of the presented algorithm is comparable to the achievable rate in the single-user scenario where there is a full collaboration among the receivers. In a sparse scattering channel, the proposed technique has significantly higher sum-rate compared to a zero- forcing based hybrid beamformer. When digital phase shifters with 3-bits of resolution are used at the RF beamformer, the proposed algorithm achieves the performance of a hybrid beamforming algorithm with analog phase shifting.
{"title":"Hybrid Beamforming for Downlink Massive MIMO Systems with Multiantenna User Equipment","authors":"S. Payami, M. Ghoraishi, M. Dianati","doi":"10.1109/VTCFall.2017.8288022","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288022","url":null,"abstract":"In this paper, a novel hybrid precoding algorithm is proposed for the downlink of a multiantenna multiuser massive multiple-input multiple-output (MIMO) system. Firstly, a modified block diagonalization precoding technique is presented. Then, it is shown that combining the modified block diagonalization with hybrid beamforming can achieve a similar sum-rate as block diagonalization with digital beamforming can. Moreover, the performance of the presented algorithm is comparable to the achievable rate in the single-user scenario where there is a full collaboration among the receivers. In a sparse scattering channel, the proposed technique has significantly higher sum-rate compared to a zero- forcing based hybrid beamformer. When digital phase shifters with 3-bits of resolution are used at the RF beamformer, the proposed algorithm achieves the performance of a hybrid beamforming algorithm with analog phase shifting.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115354429","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 : 2017-09-01DOI: 10.1109/VTCFall.2017.8288377
Jian Wang, C. Gentile, Jelena Senic, Ruoyu Sun, P. Papazian, Chiehping Lai
To date, we have designed and assembled millimeter-wave channel sounders at 60 GHz and 83 GHz. They can estimate the angle-of-departure and angle-of-arrival of channel multipath components as well as their delay and Doppler frequency shift. In addition, due to the fast acquisition time and because the receiver is mounted on a mobile robot, the systems can collect measurements for hundreds of different transmitter-receiver configurations in just minutes. It follows that channel-model reduction, including the multipath- component clustering process, must be reliable, consistent, and unsupervised. In this paper, we describe a simple clustering process tailored to the properties of millimeter-wave channels that fully exploits the multi-dimensionality of the extracted multipath components and requires only a few tunable parameters. Through extensive experimentation, we have verified that the process is robust and delivers consistent results across five different environments and across both frequency bands investigated. Illustrative examples are provided.
{"title":"Unsupervised Clustering for Millimeter-Wave Channel Propagation Modeling","authors":"Jian Wang, C. Gentile, Jelena Senic, Ruoyu Sun, P. Papazian, Chiehping Lai","doi":"10.1109/VTCFall.2017.8288377","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288377","url":null,"abstract":"To date, we have designed and assembled millimeter-wave channel sounders at 60 GHz and 83 GHz. They can estimate the angle-of-departure and angle-of-arrival of channel multipath components as well as their delay and Doppler frequency shift. In addition, due to the fast acquisition time and because the receiver is mounted on a mobile robot, the systems can collect measurements for hundreds of different transmitter-receiver configurations in just minutes. It follows that channel-model reduction, including the multipath- component clustering process, must be reliable, consistent, and unsupervised. In this paper, we describe a simple clustering process tailored to the properties of millimeter-wave channels that fully exploits the multi-dimensionality of the extracted multipath components and requires only a few tunable parameters. Through extensive experimentation, we have verified that the process is robust and delivers consistent results across five different environments and across both frequency bands investigated. Illustrative examples are provided.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115821551","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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