Pub Date : 2019-09-01DOI: 10.1109/VTCFall.2019.8891391
Ziyang Lu, M. C. Gursoy
Efficient use of spectral and energy resources is critical in wireless networks and has been extensively studied in recent years. In particular, dynamic spectrum access and power control have been addressed primarily via optimization and game-theoretic tools. In this paper, motivated by recent advances in machine learning and, more specifically, the success of reinforcement learning for addressing dynamic control problems, we consider deep reinforcement learning to jointly perform dynamic channel access and power control in wireless interference channels. We propose a deep Q-learning model, develop an algorithm, and evaluate the performance considering different utilities and reward mechanisms. We provide comparisons with the optimal centralized strategies that require complete information and use weighted minimum mean square error (WMMSE) based power control and exhaustive search over all channel selection policies. We highlight the performance improvements with power control.
{"title":"Dynamic Channel Access and Power Control via Deep Reinforcement Learning","authors":"Ziyang Lu, M. C. Gursoy","doi":"10.1109/VTCFall.2019.8891391","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891391","url":null,"abstract":"Efficient use of spectral and energy resources is critical in wireless networks and has been extensively studied in recent years. In particular, dynamic spectrum access and power control have been addressed primarily via optimization and game-theoretic tools. In this paper, motivated by recent advances in machine learning and, more specifically, the success of reinforcement learning for addressing dynamic control problems, we consider deep reinforcement learning to jointly perform dynamic channel access and power control in wireless interference channels. We propose a deep Q-learning model, develop an algorithm, and evaluate the performance considering different utilities and reward mechanisms. We provide comparisons with the optimal centralized strategies that require complete information and use weighted minimum mean square error (WMMSE) based power control and exhaustive search over all channel selection policies. We highlight the performance improvements with power control.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"88 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87456422","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.2019.8891093
Stefan A. Damjancevic, E. Matús, Dmitry Utyansky, P. V. D. Wolf, G. Fettweis
Generalised frequency division multiplexing (GFDM) is a novel multicarrier waveform with reduced out- of-band emission and peak-to-average-power-ratio compared to orthogonal frequency division multiplexing. Due to these properties, GFDM is regarded a candidate waveform for future wireless communication. However, an implementation that addresses operating conditions of handheld devices has not yet been considered. We propose a software programmable GFDM solution for handheld devices. This paper presents necessary capabilities of a vector DSP implementation to efficiently process GFDM in the context of 5G use cases. We investigate structural properties and numerical precision of the GFDM algorithm, propose a scalable vectorised approach for single instruction multiple data processing, and carry out a performance-cost evaluation. We present our key findings to enable GFDM functionality on handheld user equipment.
{"title":"Towards GFDM for Handsets - Efficient and Scalable Implementation on a Vector DSP","authors":"Stefan A. Damjancevic, E. Matús, Dmitry Utyansky, P. V. D. Wolf, G. Fettweis","doi":"10.1109/VTCFall.2019.8891093","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891093","url":null,"abstract":"Generalised frequency division multiplexing (GFDM) is a novel multicarrier waveform with reduced out- of-band emission and peak-to-average-power-ratio compared to orthogonal frequency division multiplexing. Due to these properties, GFDM is regarded a candidate waveform for future wireless communication. However, an implementation that addresses operating conditions of handheld devices has not yet been considered. We propose a software programmable GFDM solution for handheld devices. This paper presents necessary capabilities of a vector DSP implementation to efficiently process GFDM in the context of 5G use cases. We investigate structural properties and numerical precision of the GFDM algorithm, propose a scalable vectorised approach for single instruction multiple data processing, and carry out a performance-cost evaluation. We present our key findings to enable GFDM functionality on handheld user equipment.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"207 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83579691","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.2019.8891265
Lucy Bowen, R. Hulbert, Jason Fong, Zachary Rentz, Bruce DeBruhl
Using the variation in RF signals to estimate what is happening in a room, commonly referred to as radio tomography, is a rapidly evolving field. Radio tomography has found numerous applications ranging from security to elder care. Although radio tomography has many applications and considerable research literature, many previous implementations use expensive, specialized test benches with closed source algorithms. In this paper, we demonstrate that high-accuracy radio tomography can be implemented using inexpensive, commodity WiFi equipment and free open-source algorithms. We call this system democratized radio tomography and show how it can be used by a broad population to explore and develop new tomography algorithms. In our system, we use the Nexmon open source firmware patch on a Nexus~5 smartphone to monitor fluctuations in the 5~GHz Wifi channel state information (CSI) from a WiFi access point. We use this signal to train a neural network for reliable classification and noise suppression. We perform two experiments with our system. In the first, we recognize a person walking through a room and identifies them from a set of known test subjects. In the second, we identify if water is running in a bathroom. Our trained neural network distinguishes an individual from other individuals in our test set with 86% accuracy, and could identify if water was running in a bathroom with 85% accuracy. These results are obtained with a laptop and less than $200 of additional equipment.
{"title":"Democratized Radio Tomography: Using Consumer Equipment to See through Walls","authors":"Lucy Bowen, R. Hulbert, Jason Fong, Zachary Rentz, Bruce DeBruhl","doi":"10.1109/VTCFall.2019.8891265","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891265","url":null,"abstract":"Using the variation in RF signals to estimate what is happening in a room, commonly referred to as radio tomography, is a rapidly evolving field. Radio tomography has found numerous applications ranging from security to elder care. Although radio tomography has many applications and considerable research literature, many previous implementations use expensive, specialized test benches with closed source algorithms. In this paper, we demonstrate that high-accuracy radio tomography can be implemented using inexpensive, commodity WiFi equipment and free open-source algorithms. We call this system democratized radio tomography and show how it can be used by a broad population to explore and develop new tomography algorithms. In our system, we use the Nexmon open source firmware patch on a Nexus~5 smartphone to monitor fluctuations in the 5~GHz Wifi channel state information (CSI) from a WiFi access point. We use this signal to train a neural network for reliable classification and noise suppression. We perform two experiments with our system. In the first, we recognize a person walking through a room and identifies them from a set of known test subjects. In the second, we identify if water is running in a bathroom. Our trained neural network distinguishes an individual from other individuals in our test set with 86% accuracy, and could identify if water was running in a bathroom with 85% accuracy. These results are obtained with a laptop and less than $200 of additional equipment.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"82 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76116521","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.2019.8891169
K. N. R. S. V. Prasad, V. Bhargava
We consider positioning multiple users si- multaneously in a distributed massive multiple-input multiple-output (MIMO) system from the uplink re- ceived signal strength (RSS) information. The trans- mission power of the users, although available from the telecommunication protocol specifications, is con- sidered unknown due to the uncertainty arising from hardware component losses and/or battery voltage fluctuations. The pathloss exponent is also assumed to be unknown due to environmental fluctuations and/or infrequent calibration campaigns. Taking these con- straints into account, we propose a positioning algo- rithm which uses the concept of differential RSS to handle the transmit power uncertainty and derives a linear least squares solution from the ratio-of-distance estimates, which are in turn obtained by assuming that the pathloss exponent is a uniformly distributed random variable. Numerical studies reveal that the proposed positioning algorithm achieves meter-level accuracy even though the transmit power and the pathloss exponent are unknown. The best localization performance is achieved when the differential RSS is calculated using the remote radio head (RRH) with the lowest RSS as the reference. Also, the observed localization performance is consistent across different pathloss exponent values.
{"title":"RSS-Based Positioning in Distributed Massive MIMO under Unknown Transmit Power and Pathloss Exponent","authors":"K. N. R. S. V. Prasad, V. Bhargava","doi":"10.1109/VTCFall.2019.8891169","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891169","url":null,"abstract":"We consider positioning multiple users si- multaneously in a distributed massive multiple-input multiple-output (MIMO) system from the uplink re- ceived signal strength (RSS) information. The trans- mission power of the users, although available from the telecommunication protocol specifications, is con- sidered unknown due to the uncertainty arising from hardware component losses and/or battery voltage fluctuations. The pathloss exponent is also assumed to be unknown due to environmental fluctuations and/or infrequent calibration campaigns. Taking these con- straints into account, we propose a positioning algo- rithm which uses the concept of differential RSS to handle the transmit power uncertainty and derives a linear least squares solution from the ratio-of-distance estimates, which are in turn obtained by assuming that the pathloss exponent is a uniformly distributed random variable. Numerical studies reveal that the proposed positioning algorithm achieves meter-level accuracy even though the transmit power and the pathloss exponent are unknown. The best localization performance is achieved when the differential RSS is calculated using the remote radio head (RRH) with the lowest RSS as the reference. Also, the observed localization performance is consistent across different pathloss exponent values.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"20 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76452721","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.2019.8891486
Chi-Hung Lin, Wei-Che Chien, Jen-Yeu Chen, Chin-Feng Lai, H. Chao
Cloud RAN (C-RAN) where Base Band Units (BBUs) are collocated in a computing/processing center remotely away from their correspondent Remote Radio Heads (RRHs) for the efficient resource sharing is the prevailing RAN (Radio Access Network) design for next generation mobile networks. However, in C- RAN, the possible high latency from a RRH to the centralized Cloud BBU pool is not desirable for some latency critical applications. Thus, several local and smaller BBU pools are necessary to be deployed close to the RRHs to constrain the latency. This RAN architecture is so-call Fog RAN (F-RAN). A Mobile Edge Computing (MEC) center can be deployed beside or nearby a F-RAN BBU pool for timely processing. In this paper, we tackle the BBU resource allocation problem (a modified bin packing problem) between the set of RRHs and the set of BBU pools in F-RAN so that only a minimal number of BBU pools, i.e., the bins in a bin packing problem, will be turned on to serve all RRHs and so to save the energy consumption. Also, for the stability and fault tolerance, in addition to saving energy, the proposed algorithms also perform load balancing amid serving BBU pools. Our extensive simulation results show that the proposed scheme for energy efficient BBU resource allocation is able to achieve the goal of saving energy consumption and load balancing.
云RAN (C-RAN)是下一代移动网络的主流RAN(无线接入网)设计，其中基带单元(BBUs)配置在远离其对应的远程无线电头(RRHs)的计算/处理中心，以实现有效的资源共享。然而，在C- RAN中，从RRH到集中式Cloud BBU池可能存在的高延迟对于某些延迟关键型应用程序来说是不可取的。因此，需要在靠近rrh的地方部署几个较小的本地BBU池，以限制延迟。这种RAN架构就是所谓的Fog RAN (F-RAN)。移动边缘计算(MEC)中心可以部署在F-RAN BBU池旁边或附近，以便及时处理。在本文中，我们解决了在F-RAN中，一组rrh和一组BBU池之间的BBU资源分配问题(一个改进的bin packing问题)，使得只有最少数量的BBU池，即一个bin packing问题中的bin，会被打开来服务所有的rrh，从而节省能源消耗。此外，为了提高系统的稳定性和容错性，除了节能之外，该算法还可以实现BBU池之间的负载均衡。大量的仿真结果表明，所提出的高效BBU资源分配方案能够达到节能和负载均衡的目的。
{"title":"Energy Efficient Fog RAN (F-RAN) with Flexible BBU Resource Assignment for Latency Aware Mobile Edge Computing (MEC) Services","authors":"Chi-Hung Lin, Wei-Che Chien, Jen-Yeu Chen, Chin-Feng Lai, H. Chao","doi":"10.1109/VTCFall.2019.8891486","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891486","url":null,"abstract":"Cloud RAN (C-RAN) where Base Band Units (BBUs) are collocated in a computing/processing center remotely away from their correspondent Remote Radio Heads (RRHs) for the efficient resource sharing is the prevailing RAN (Radio Access Network) design for next generation mobile networks. However, in C- RAN, the possible high latency from a RRH to the centralized Cloud BBU pool is not desirable for some latency critical applications. Thus, several local and smaller BBU pools are necessary to be deployed close to the RRHs to constrain the latency. This RAN architecture is so-call Fog RAN (F-RAN). A Mobile Edge Computing (MEC) center can be deployed beside or nearby a F-RAN BBU pool for timely processing. In this paper, we tackle the BBU resource allocation problem (a modified bin packing problem) between the set of RRHs and the set of BBU pools in F-RAN so that only a minimal number of BBU pools, i.e., the bins in a bin packing problem, will be turned on to serve all RRHs and so to save the energy consumption. Also, for the stability and fault tolerance, in addition to saving energy, the proposed algorithms also perform load balancing amid serving BBU pools. Our extensive simulation results show that the proposed scheme for energy efficient BBU resource allocation is able to achieve the goal of saving energy consumption and load balancing.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"87 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76516563","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.2019.8891163
Hoang D. Le, V. Mai, Chuyen T. Nguyen, A. Pham
This paper studies the error-control protocol design for free-space optical (FSO) burst transmission in satellite communication systems. Specifically, we model and analyze the throughput performance of LEO-to-ground FSO systems over atmospheric turbulence channels when incremental redundancy hybrid automatic repeat request (IR-HARQ) protocols, which combine rate-compatible punctured convolutional (RCPC) code and sliding window ARQ, are employed. For this purpose, the time-varying behavior of atmospheric turbulence channels is first captured by a finite-state Markov chain. Then, the channel model is used to develop the burst loss model for IR-HARQ in order to analytically derive the system throughput. The results quantitatively show the impact of atmospheric turbulence on the throughput performance and support the optimal selection of system parameters. Monte Carlo simulations are also performed to validate the accuracy of theoretical derivations.
{"title":"Throughput Analysis of Incremental Redundancy Hybrid ARQ for FSO-Based Satellite Systems","authors":"Hoang D. Le, V. Mai, Chuyen T. Nguyen, A. Pham","doi":"10.1109/VTCFall.2019.8891163","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891163","url":null,"abstract":"This paper studies the error-control protocol design for free-space optical (FSO) burst transmission in satellite communication systems. Specifically, we model and analyze the throughput performance of LEO-to-ground FSO systems over atmospheric turbulence channels when incremental redundancy hybrid automatic repeat request (IR-HARQ) protocols, which combine rate-compatible punctured convolutional (RCPC) code and sliding window ARQ, are employed. For this purpose, the time-varying behavior of atmospheric turbulence channels is first captured by a finite-state Markov chain. Then, the channel model is used to develop the burst loss model for IR-HARQ in order to analytically derive the system throughput. The results quantitatively show the impact of atmospheric turbulence on the throughput performance and support the optimal selection of system parameters. Monte Carlo simulations are also performed to validate the accuracy of theoretical derivations.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"2 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76908866","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.2019.8891322
Carla Di Paola, K. Zhao, Shuai Zhang, G. Pedersen
This paper presents a new SIW horn antenna with high performance in the mm-wave bands for the next generation mobile devices. The proposed antenna is integrated in a double layer of Rogers RO4003C substrate and requires a clearance of only 3 mm. Air vias are etched in the substrate in a specific portion of the horn aperture, in order to correct the phase of the electromagnetic wave and allow the beam pointing in the desired direction. Moreover, a tapered ladder transition is placed at the horn aperture to improve the impedance matching and enhance the radiation performance. Simulation results prove that the 6 dB bandwidth is wider than 40 GHz in the frequency range 24-64 GHz. In particular, the same beam pointing is guaranteed over the whole bandwidth with realized gain of 6.4, 8.5 and 8.7 dBi at 28, 38 and 60 GHz respectively. Simulations including two symmetric elements pointing opposite directions and a central element show that the angle of 90° can be covered with peak gain of 7.5 dBi at 28 GHz.
{"title":"Wideband SIW Horn Antenna with Phase Correction for New Generation Beam Steerable Arrays","authors":"Carla Di Paola, K. Zhao, Shuai Zhang, G. Pedersen","doi":"10.1109/VTCFall.2019.8891322","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891322","url":null,"abstract":"This paper presents a new SIW horn antenna with high performance in the mm-wave bands for the next generation mobile devices. The proposed antenna is integrated in a double layer of Rogers RO4003C substrate and requires a clearance of only 3 mm. Air vias are etched in the substrate in a specific portion of the horn aperture, in order to correct the phase of the electromagnetic wave and allow the beam pointing in the desired direction. Moreover, a tapered ladder transition is placed at the horn aperture to improve the impedance matching and enhance the radiation performance. Simulation results prove that the 6 dB bandwidth is wider than 40 GHz in the frequency range 24-64 GHz. In particular, the same beam pointing is guaranteed over the whole bandwidth with realized gain of 6.4, 8.5 and 8.7 dBi at 28, 38 and 60 GHz respectively. Simulations including two symmetric elements pointing opposite directions and a central element show that the angle of 90° can be covered with peak gain of 7.5 dBi at 28 GHz.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"16 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79593902","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.2019.8891582
Zhaofeng Liu, Lin Zhang, Zhiqiang Wu, Jing Bian
In this paper, we proposed a novel carrier interferometry (CI) code index modulation aided orthogonal frequency division multiplex (OFDM) differential chaotic shift keying (DCSK) communication system. In our design, we utilize the orthogonality property of CI codes matrix, and propose to transmit more information bits using the index of the CI codes matrix. The input information stream is divided into two subsets. One subset is modulated by the chaotic sequence and then spread by the information-bearing CI codes matrix which carries another information subset. At the receiver, the non-coherent chaotic demodulation and the maximum likelihood detection are respectively performed on these two subsets to retrieve the information. Since more bits can be transmitted while not requiring extra chaotic sequences and remaining the same overall energy, the energy efficiency is improved. Additionally, thanks to the spreading in the frequency domain achieved by the usage of CI codes, the peak to average power ratio (PAPR) can be suppressed. Moreover, theoretical performances including the energy efficiency, the bit error rate (BER) expressions are analyzed. Simulation results are provided to validate the theoretical analysis, and demonstrate the satisfactory PAPR and BER performances achieved by our design.
{"title":"Carrier Interferometry Code Index Modulation Aided OFDM-Based DCSK Communications","authors":"Zhaofeng Liu, Lin Zhang, Zhiqiang Wu, Jing Bian","doi":"10.1109/VTCFall.2019.8891582","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891582","url":null,"abstract":"In this paper, we proposed a novel carrier interferometry (CI) code index modulation aided orthogonal frequency division multiplex (OFDM) differential chaotic shift keying (DCSK) communication system. In our design, we utilize the orthogonality property of CI codes matrix, and propose to transmit more information bits using the index of the CI codes matrix. The input information stream is divided into two subsets. One subset is modulated by the chaotic sequence and then spread by the information-bearing CI codes matrix which carries another information subset. At the receiver, the non-coherent chaotic demodulation and the maximum likelihood detection are respectively performed on these two subsets to retrieve the information. Since more bits can be transmitted while not requiring extra chaotic sequences and remaining the same overall energy, the energy efficiency is improved. Additionally, thanks to the spreading in the frequency domain achieved by the usage of CI codes, the peak to average power ratio (PAPR) can be suppressed. Moreover, theoretical performances including the energy efficiency, the bit error rate (BER) expressions are analyzed. Simulation results are provided to validate the theoretical analysis, and demonstrate the satisfactory PAPR and BER performances achieved by our design.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"29 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77212594","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.2019.8891478
Beomju Kim, Jehyun Heo, D. Hong
In this paper, we consider the user fairness in partial non-orthogonal multiple access (P-NOMA) system which was proposed in our previous work. In the P-NOMA system, the interference of NOMA can be managed by adjusting the overlap ratio between users. In our previous works, we considered the enhancement of sum of achievable rate. In this paper, we investigate the performance of P-NOMA in terms of user fairness. For reflecting user fairness on P-NOMA systems, we first define the metric to represent user fairness and then observe the target performance metric according to overlap ratio. In addition, we propose a feasible operating method to achieve the user fairness.
{"title":"Partial Non-Orthogonal Multiple Access (P-NOMA) with Respect to User Fairness","authors":"Beomju Kim, Jehyun Heo, D. Hong","doi":"10.1109/VTCFall.2019.8891478","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891478","url":null,"abstract":"In this paper, we consider the user fairness in partial non-orthogonal multiple access (P-NOMA) system which was proposed in our previous work. In the P-NOMA system, the interference of NOMA can be managed by adjusting the overlap ratio between users. In our previous works, we considered the enhancement of sum of achievable rate. In this paper, we investigate the performance of P-NOMA in terms of user fairness. For reflecting user fairness on P-NOMA systems, we first define the metric to represent user fairness and then observe the target performance metric according to overlap ratio. In addition, we propose a feasible operating method to achieve the user fairness.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"94 9","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91423219","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.2019.8891119
Jiaman Li, Le Chung Tran, F. Safaei
In this paper, the performance of in-band full- duplex OFDM relaying systems with energy- harvesting and self-interference cancellation in the polarization domain is analyzed. Specifically, we use the time switching-based relaying protocol to implement energy harvesting. The harvested energy is used by the relay to forward the transmitted information from the source. To cancel the self-interference, the polarization-enabled digital self-interference cancellation scheme is deployed at the relay. Our simulation results show that the full-duplex OFDM energy harvesting relaying system almost doubles the throughput, while maintaining the same bit error performance by a modest increase in the signal-to-noise ratio compared to the half-duplex OFDM energy harvesting relaying system. It is also revealed that the optimal time splitting factor should be less than 0.3 to maximize the full-duplex system throughput.
{"title":"Full-Duplex OFDM Relaying Systems with Energy Harvesting in Multipath Fading Channels","authors":"Jiaman Li, Le Chung Tran, F. Safaei","doi":"10.1109/VTCFall.2019.8891119","DOIUrl":"https://doi.org/10.1109/VTCFall.2019.8891119","url":null,"abstract":"In this paper, the performance of in-band full- duplex OFDM relaying systems with energy- harvesting and self-interference cancellation in the polarization domain is analyzed. Specifically, we use the time switching-based relaying protocol to implement energy harvesting. The harvested energy is used by the relay to forward the transmitted information from the source. To cancel the self-interference, the polarization-enabled digital self-interference cancellation scheme is deployed at the relay. Our simulation results show that the full-duplex OFDM energy harvesting relaying system almost doubles the throughput, while maintaining the same bit error performance by a modest increase in the signal-to-noise ratio compared to the half-duplex OFDM energy harvesting relaying system. It is also revealed that the optimal time splitting factor should be less than 0.3 to maximize the full-duplex system throughput.","PeriodicalId":6713,"journal":{"name":"2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)","volume":"20 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87209033","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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