Pub Date : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528528
G. Kobayashi, O. Takyu, K. Adachi, M. Ohta, T. Fujii
In recent years, Low Power Wide Area (LPWA) has been attracting attention as being suitable for utilizing the Internet of Things (IoT). In Japan, LPWA has been standardized as a specific low power radio that uses the 920MHz band, and is a communication standard that enables long-distance communication with low power consumption. In the specific low power radio of the 920MHz band, since multiple radio standards share the same frequency, communication interruption due to the same frequency interference Co-Channel Interference (CCI) becomes a serious problem. Long Range (LoRa), which is one of LPWA, uses chirp modulation (spread spectrum technology) to suppress CCI. This modulation method is resistant to CCI because it expands the desired signal power after demodulation by wideband gain. However, when operating LoRa, it is necessary to determine the necessity of frequency sharing suitable for Signal to Interference Ratio (SIR) in consideration of interference from other systems, and to set the required diffusion rate. The authors have proposed a method for estimating desired signal power and interference power using chirp demodulation. In this paper, we have established a method for estimating the occupancy rate, which is the access ratio of other systems, with high accuracy from the probability distribution of interference power and noise power.
近年来，低功率广域(LPWA)因适合利用物联网(IoT)而备受关注。在日本，LPWA已经被标准化为使用920MHz频段的特定低功率无线电，是一种能够以低功耗进行远距离通信的通信标准。在920MHz频段的特定低功率无线电中，由于多个无线电标准共用同一频率，因此由于同频干扰导致的通信中断成为一个严重的问题。远程(LoRa)是LPWA的一种，它采用啁啾调制(扩频技术)来抑制CCI。这种调制方法可以抵抗CCI，因为它通过宽带增益解调后扩大了所需的信号功率。但是，在操作LoRa时，需要考虑到其他系统的干扰，确定是否需要适合SIR (Signal to Interference Ratio，信号干扰比)的频率共享，并设定所需的扩散速率。提出了一种利用啁啾解调估计期望信号功率和干扰功率的方法。本文从干扰功率和噪声功率的概率分布出发，建立了一种高精度估计占用率(即其他系统的接入比)的方法。
{"title":"Proposal of interference power occupancy estimation method using chirp demodulation","authors":"G. Kobayashi, O. Takyu, K. Adachi, M. Ohta, T. Fujii","doi":"10.1109/ICUFN49451.2021.9528528","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528528","url":null,"abstract":"In recent years, Low Power Wide Area (LPWA) has been attracting attention as being suitable for utilizing the Internet of Things (IoT). In Japan, LPWA has been standardized as a specific low power radio that uses the 920MHz band, and is a communication standard that enables long-distance communication with low power consumption. In the specific low power radio of the 920MHz band, since multiple radio standards share the same frequency, communication interruption due to the same frequency interference Co-Channel Interference (CCI) becomes a serious problem. Long Range (LoRa), which is one of LPWA, uses chirp modulation (spread spectrum technology) to suppress CCI. This modulation method is resistant to CCI because it expands the desired signal power after demodulation by wideband gain. However, when operating LoRa, it is necessary to determine the necessity of frequency sharing suitable for Signal to Interference Ratio (SIR) in consideration of interference from other systems, and to set the required diffusion rate. The authors have proposed a method for estimating desired signal power and interference power using chirp demodulation. In this paper, we have established a method for estimating the occupancy rate, which is the access ratio of other systems, with high accuracy from the probability distribution of interference power and noise power.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122755975","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528690
Daeun Jung, Jungjin Lee, Hyunggon Park
In this paper, we propose a feature expansion approach for the lowest one-dimension (1-D) time series data classification problems, where the expanded features include temporal, frequency, and statistical characteristics. We show that the proposed feature expansion can improve the classification accuracy compared to conventional machine learning algorithms for data classification. This is because the expanded features enable classifiers to consider multiple dimensions which are not feasible for low dimension data. Experiment results show that the proposed feature expansion method can improve the classification performance compared to conventional machine learning algorithms for 1-D actual biosensor data.
{"title":"Feature expansion of single dimensional time series data for machine learning classification","authors":"Daeun Jung, Jungjin Lee, Hyunggon Park","doi":"10.1109/ICUFN49451.2021.9528690","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528690","url":null,"abstract":"In this paper, we propose a feature expansion approach for the lowest one-dimension (1-D) time series data classification problems, where the expanded features include temporal, frequency, and statistical characteristics. We show that the proposed feature expansion can improve the classification accuracy compared to conventional machine learning algorithms for data classification. This is because the expanded features enable classifiers to consider multiple dimensions which are not feasible for low dimension data. Experiment results show that the proposed feature expansion method can improve the classification performance compared to conventional machine learning algorithms for 1-D actual biosensor data.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122119472","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528771
Sunghoon Hong, Daejin Park
The cause of the majority of vehicle accidents is a safety issue due to the driver's inattention, such as drowsy driving. A forward collision warning system (FCWS) can significantly reduce the number and severity of accidents by detecting the risk of collision with vehicles in front and providing an advanced warning signal to the driver. This paper describes a low power embedded system based FCWS for highway safety. The algorithm described in this paper computes time to collision (TTC) through detection, tracking, distance calculation for the vehicle ahead and current vehicle speed information with a single camera. Additionally, in order to operate in real time even in a low-performance embedded system, an optimization technique in the program with high and low levels will be introduced. The system has been tested through the driving video of the vehicle in the embedded system. As a result of using the optimization technique, the execution time was about 170 times faster than that when using the previous non-optimized process.
{"title":"Lightweight Collaboration of Detecting and Tracking Algorithm in Low-Power Embedded Systems for Forward Collision Warning","authors":"Sunghoon Hong, Daejin Park","doi":"10.1109/ICUFN49451.2021.9528771","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528771","url":null,"abstract":"The cause of the majority of vehicle accidents is a safety issue due to the driver's inattention, such as drowsy driving. A forward collision warning system (FCWS) can significantly reduce the number and severity of accidents by detecting the risk of collision with vehicles in front and providing an advanced warning signal to the driver. This paper describes a low power embedded system based FCWS for highway safety. The algorithm described in this paper computes time to collision (TTC) through detection, tracking, distance calculation for the vehicle ahead and current vehicle speed information with a single camera. Additionally, in order to operate in real time even in a low-performance embedded system, an optimization technique in the program with high and low levels will be introduced. The system has been tested through the driving video of the vehicle in the embedded system. As a result of using the optimization technique, the execution time was about 170 times faster than that when using the previous non-optimized process.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122269724","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528646
Dong-Hee Noh, Tae-Hwan Ko, Ahhyeon Hong, K. Kim, Seok-Bong Noh
This paper proposes a faulty node detection scheme in the hydroponics system. A wireless sensor system of seedling hydroponic has to considered distance-dependent bandwidth, poor quality of the links, and propagation delay. In the proposed scheme, the main control sensor node can diagnosis which sensor node are error frequently occurs. Simulation results show that the proposed method can improve the performance of the faulty detection reliability and miss-detection rate for real-time hydroponics wireless sensor systems.
{"title":"A Faulty Node Detection Method in Wireless Sensor Network in Seedling for Hydroponics","authors":"Dong-Hee Noh, Tae-Hwan Ko, Ahhyeon Hong, K. Kim, Seok-Bong Noh","doi":"10.1109/ICUFN49451.2021.9528646","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528646","url":null,"abstract":"This paper proposes a faulty node detection scheme in the hydroponics system. A wireless sensor system of seedling hydroponic has to considered distance-dependent bandwidth, poor quality of the links, and propagation delay. In the proposed scheme, the main control sensor node can diagnosis which sensor node are error frequently occurs. Simulation results show that the proposed method can improve the performance of the faulty detection reliability and miss-detection rate for real-time hydroponics wireless sensor systems.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121070935","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528770
K. Hasan, Seong-Ho Jeong
The repetition of content requests happens frequently in the vehicular networks, and it is increasing depending on the vehicular density in a certain area. On the other hand, information-centric networking (ICN) is being used in the vehicular networks to fulfill the faster content communication requirements, reduce latency, and enhance the network capacity. Although, the ICN-based vehicular networks have many benefits, it has several drawbacks, e.g., interest packet flooding, inefficient content caching, and so on. Moreover, the network scalability is related to the drawbacks of the existing ICN-based vehicular networks. It is also important that the current Internet architecture is considered as a scale-free network. Therefore, the solution of the existing drawbacks can be solved using the concept of the scale-free ICN network. In this paper, we propose a cluster-based mechanism for vehicular networks in the scale-free ICN core networks. We also simulate the various scenarios of a scale-free network and show the comparative analysis of different scenarios in terms of the total number of clusters vs the number of nodes in a cluster. Our simulation result ensures the solution to the interest flooding problem and the efficiency of the content caching mechanism.
{"title":"A Cluster-based Mechanism for Vehicular Networks in the Scale-Free ICN Core Network","authors":"K. Hasan, Seong-Ho Jeong","doi":"10.1109/ICUFN49451.2021.9528770","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528770","url":null,"abstract":"The repetition of content requests happens frequently in the vehicular networks, and it is increasing depending on the vehicular density in a certain area. On the other hand, information-centric networking (ICN) is being used in the vehicular networks to fulfill the faster content communication requirements, reduce latency, and enhance the network capacity. Although, the ICN-based vehicular networks have many benefits, it has several drawbacks, e.g., interest packet flooding, inefficient content caching, and so on. Moreover, the network scalability is related to the drawbacks of the existing ICN-based vehicular networks. It is also important that the current Internet architecture is considered as a scale-free network. Therefore, the solution of the existing drawbacks can be solved using the concept of the scale-free ICN network. In this paper, we propose a cluster-based mechanism for vehicular networks in the scale-free ICN core networks. We also simulate the various scenarios of a scale-free network and show the comparative analysis of different scenarios in terms of the total number of clusters vs the number of nodes in a cluster. Our simulation result ensures the solution to the interest flooding problem and the efficiency of the content caching mechanism.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134545436","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528805
Thenuka Karunathilake, A. Udugama, Anna Förster
The LoRa (Long Range) communication technology has gained a lot of interest recently. Typically, Internet of Things applications would use the complete LoRaWAN stack for their purposes. However, LoRaWAN supports only three types of communication, called classes A, B, and C. Each of these classes addresses a different application scenario and resource usage goals, but all of them target star topologies, where devices communicate only to the gateway. On the other hand, wireless sensor networks (WSNs) have been successfully developing and using the concept of self-organised networks and duty cycling. In this paper, we combine these fields and implement a WSN duty-cycling medium access protocol, known as Contiki-MAC, on LoRa-enabled LoPy4 devices. We experimentally evaluate our implementation and we compare its power consumption with that of LoRaWAN-enabled devices. We show that our implementation is more power-efficient while achieving higher traffic rates and offering the freedom of self-organised networking for various applications.
{"title":"LoRa-DuCy: Duty Cycling for LoRa-Enabled Internet of Things Devices","authors":"Thenuka Karunathilake, A. Udugama, Anna Förster","doi":"10.1109/ICUFN49451.2021.9528805","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528805","url":null,"abstract":"The LoRa (Long Range) communication technology has gained a lot of interest recently. Typically, Internet of Things applications would use the complete LoRaWAN stack for their purposes. However, LoRaWAN supports only three types of communication, called classes A, B, and C. Each of these classes addresses a different application scenario and resource usage goals, but all of them target star topologies, where devices communicate only to the gateway. On the other hand, wireless sensor networks (WSNs) have been successfully developing and using the concept of self-organised networks and duty cycling. In this paper, we combine these fields and implement a WSN duty-cycling medium access protocol, known as Contiki-MAC, on LoRa-enabled LoPy4 devices. We experimentally evaluate our implementation and we compare its power consumption with that of LoRaWAN-enabled devices. We show that our implementation is more power-efficient while achieving higher traffic rates and offering the freedom of self-organised networking for various applications.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134498203","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528555
Jingjing Wang, Jishen Peng, Xianqing Wang, J. Hwang, J. Park
Received Signal Strength Indicators (RSSI)-based indoor positioning technology is widely used in the field of Wi-Fi indoor positioning. However, the propagation of RSSI is still affected by indoor multipath, and we cannot obtain signals in some corner areas. This paper analyzes the distance relationship between the RSSI on each antenna of the receiver and the distance between transmitter and proposes a novel ranging algorithm based on multi-antenna RSSI measurements. This novel algorithm uses a Least Squares Method (LSM) on the basis of a signal attenuation model to optimize, eliminate the noise and redundancy of the original data and reduce the positioning error. Experimental results show that the indoor multi-antenna RSSI ranging based on the single Gaussian model has high fitting accuracy and applicability. The proposed approach achieves significant localization accuracy improvement over using the single antenna RSSI-based ranging method. Meanwhile, the algorithm improves the influence of multiple paths in a complex indoor environment on location, and the method can obtain more accurate ranging results.
{"title":"Distance Estimation Algorithm Based on Multi-Antenna Signal Attenuation Model","authors":"Jingjing Wang, Jishen Peng, Xianqing Wang, J. Hwang, J. Park","doi":"10.1109/ICUFN49451.2021.9528555","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528555","url":null,"abstract":"Received Signal Strength Indicators (RSSI)-based indoor positioning technology is widely used in the field of Wi-Fi indoor positioning. However, the propagation of RSSI is still affected by indoor multipath, and we cannot obtain signals in some corner areas. This paper analyzes the distance relationship between the RSSI on each antenna of the receiver and the distance between transmitter and proposes a novel ranging algorithm based on multi-antenna RSSI measurements. This novel algorithm uses a Least Squares Method (LSM) on the basis of a signal attenuation model to optimize, eliminate the noise and redundancy of the original data and reduce the positioning error. Experimental results show that the indoor multi-antenna RSSI ranging based on the single Gaussian model has high fitting accuracy and applicability. The proposed approach achieves significant localization accuracy improvement over using the single antenna RSSI-based ranging method. Meanwhile, the algorithm improves the influence of multiple paths in a complex indoor environment on location, and the method can obtain more accurate ranging results.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134550042","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528754
Sungwon Lee, J. Ha, Junho Seo, Dongkyun Kim
Recently, methods are studied to overcome various problems for Named Data Networking(NDN). Among them, a new method which can overcome content storm problem is required to reduce network congestion and deliver content packet to consumer reliably. According to the various studies, the content storm problems could be overcame by scoped interest flooding. However, because these methods do not considers not only network congestion ratio but also the number another different paths, the correspond content packets could be transmitted unnecessary and network congestion could be worse. Therefore, in this paper, we propose a new content forwarding method for NDN to overcome the content storm problem. In the proposed method, if the network is locally congested and another paths are generated, an intermediate node could postpone or withdraw the content packet transmission to reduce congestion.
{"title":"Avoiding Content Storm Problem in Named Data Networking","authors":"Sungwon Lee, J. Ha, Junho Seo, Dongkyun Kim","doi":"10.1109/ICUFN49451.2021.9528754","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528754","url":null,"abstract":"Recently, methods are studied to overcome various problems for Named Data Networking(NDN). Among them, a new method which can overcome content storm problem is required to reduce network congestion and deliver content packet to consumer reliably. According to the various studies, the content storm problems could be overcame by scoped interest flooding. However, because these methods do not considers not only network congestion ratio but also the number another different paths, the correspond content packets could be transmitted unnecessary and network congestion could be worse. Therefore, in this paper, we propose a new content forwarding method for NDN to overcome the content storm problem. In the proposed method, if the network is locally congested and another paths are generated, an intermediate node could postpone or withdraw the content packet transmission to reduce congestion.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134557376","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528803
Kyoungtae Ji, Kyoungseok Han
This paper presents an optimal decision-making strategy for a self-driving car using a game-theoretic approach. To ensure the safety of the decision, Stackelberg game's maximin reward strategy, which considers concurrency, is applied. The receding horizon is included to increase the accuracy of the decision, but the computational burden is high. We assume that the follower takes only one prediction time, not the receding horizon, to relieve the computational burden. For an accurate prediction of interacting vehicles, the intention estimation model is suggested. We demonstrate the efficiency of our approach in a simulation environment and various traffic conditions.
{"title":"Optimal Decision-Making Strategies for Self-Driving Car Inspired by Game Theory","authors":"Kyoungtae Ji, Kyoungseok Han","doi":"10.1109/ICUFN49451.2021.9528803","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528803","url":null,"abstract":"This paper presents an optimal decision-making strategy for a self-driving car using a game-theoretic approach. To ensure the safety of the decision, Stackelberg game's maximin reward strategy, which considers concurrency, is applied. The receding horizon is included to increase the accuracy of the decision, but the computational burden is high. We assume that the follower takes only one prediction time, not the receding horizon, to relieve the computational burden. For an accurate prediction of interacting vehicles, the intention estimation model is suggested. We demonstrate the efficiency of our approach in a simulation environment and various traffic conditions.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122277937","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 : 2021-08-17DOI: 10.1109/ICUFN49451.2021.9528667
K. Ohno
This paper discusses the out-of-band emission power reduction technique by window functions and performance improvement scheme for OFDM (Orthogonal Frequency Multiple Access) systems. The windowed OFDM is effective to suppress the out-of-emission band, however, the communication performance is degraded, comparing with the conventional OFDM system. To improve the performance in frequency selective fading channel, the pre-coding using the unitary transform is adopted. Moreover, the performance improvement scheme that data sequence between the unitary transform and IFFT/FFT is interleaved for the pre-coded windowed OFDM system is proposed. The BER (Bit Error Rate) is evaluated to show the effectiveness of the proposed scheme, comparing to the conventional pre-coded windowed schemes and the out-of-band emission power is also reduced.
{"title":"Performance improvement for windowed OFDM using pre-coding and sub-carriers interleaving","authors":"K. Ohno","doi":"10.1109/ICUFN49451.2021.9528667","DOIUrl":"https://doi.org/10.1109/ICUFN49451.2021.9528667","url":null,"abstract":"This paper discusses the out-of-band emission power reduction technique by window functions and performance improvement scheme for OFDM (Orthogonal Frequency Multiple Access) systems. The windowed OFDM is effective to suppress the out-of-emission band, however, the communication performance is degraded, comparing with the conventional OFDM system. To improve the performance in frequency selective fading channel, the pre-coding using the unitary transform is adopted. Moreover, the performance improvement scheme that data sequence between the unitary transform and IFFT/FFT is interleaved for the pre-coded windowed OFDM system is proposed. The BER (Bit Error Rate) is evaluated to show the effectiveness of the proposed scheme, comparing to the conventional pre-coded windowed schemes and the out-of-band emission power is also reduced.","PeriodicalId":318542,"journal":{"name":"2021 Twelfth International Conference on Ubiquitous and Future Networks (ICUFN)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124982183","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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