Y. Li, Minhua Chen, Yang Yang, Ming-Tuo Zhou, Chengxiang Wang
{"title":"Convolutional recurrent neural network-based channel equalization: An experimental study","authors":"Y. Li, Minhua Chen, Yang Yang, Ming-Tuo Zhou, Chengxiang Wang","doi":"10.23919/APCC.2017.8304090","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304090","url":null,"abstract":"In this paper, we revisit the idea of using deep neural network for channel equalization to account for nonlinear channel distortions as well as temporal variations of radio signals. Our insight is leveraging the the shift-invariant properties of the convolutional neural network (CNN) to learn matched filters analogous to the tap weights of conventional equalizer. Then we feed the learned filters into a subsequent recurrent neural network (RNN) with long-short-term-memory (LSTM) cells for temporal modeling of the channel. We train our proposed CNN-RNN (CRNN) equalizer based on real testbed collected data and enlarge the generalization ability of the learned network model as much as we can to adapt to different channel conditions. Experimental results show that the SER performance for our designated single-input single-output (SISO) system which utilises quadrature phase shift keying (QPSK) modulation scheme with the proposed CRNN-based channel equalizer outperforms that of other equalizers by average 2 to 5 dB at low signal-to-noise ratio (SNR).","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114451216","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}
{"title":"Non-orthogonal multiple access systems with wireless energy harvesting","authors":"Jie Gong, Xiang Chen","doi":"10.23919/APCC.2017.8304068","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304068","url":null,"abstract":"Non-orthogonal multiple access (NOMA) is a candidate multiple access scheme in 5G systems for the simultaneous access of tremendous number of wireless nodes. On the other hand, RF-enabled wireless energy harvesting is a promising technology for self-sustainable wireless nodes. In this paper, we consider a NOMA system where the near user harvests energy from the strong radio signal to power-on the information decoder. A generalized energy harvesting framework is proposed by combining the conventional time switching and power splitting scheme, and the achievable rate regions for time switching and power splitting are characterized in closed-form. Numerical results demonstrate the relationship among generalized scheme, time switching scheme and power splitting scheme.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123438651","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}
{"title":"Investigation on optimum frequency bandwidth allocation method among service channels for system throughput maximization","authors":"Shota Mizuno, D. Muramatsu, Y. Yuda, K. Higuchi","doi":"10.23919/APCC.2017.8304037","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304037","url":null,"abstract":"In the fifth generation mobile communication systems, various wireless communication services such as massive machine-type communications (mMTC), ultra-reliable low latency communications (URLLC), and enhanced mobile broadband (eMBB) will be supported. The physical channels (service channels) dedicated to these respective wireless communication services will be multiplexed in a shared system frequency band and these services will have different requirements regarding spectrum efficiency and fairness among terminals. Therefore, appropriate frequency bandwidth assignment to each service channel considering the service requirement, number of terminals, and their channel conditions for all wireless communication services is important to maximize the system performance. In this paper, we define different forms of system throughput for the respective service channels considering different service requirements. Based on a definition of the integrated system throughput that combines the system throughput levels of all service channels, this paper proposes the optimum frequency bandwidth allocation method among service channels to maximize the integrated system throughput. Computer simulation results show the effectiveness of the proposed method.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"277 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117114511","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}
Yishi Xue, Jun Zhang, Yu Han, Shi Jin, G. Zheng, Hongbo Zhu
{"title":"Large system analysis of C-RAN downlink transmission in the presence of phase noise","authors":"Yishi Xue, Jun Zhang, Yu Han, Shi Jin, G. Zheng, Hongbo Zhu","doi":"10.23919/APCC.2017.8304067","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304067","url":null,"abstract":"In this paper, we analyze the effect of phase noise on the downlink ergodic sum-rate of a cloud radio access network. The system comprises of one baseband processing unit (BBU) on the cloud server which coordinates M multi-antenna remote radio heads (RRHs) serving K single-antenna users using regularized zero-forcing precoding. We assume the BBU has all users' data and imperfect channel state information and communicate with RRHs via optical fibers which are referred to as fronthaul links. The effect of phase noise both at RRHs and users is also taken into consideration. A deterministic approximation of downlink ergodic sum-rate is derived based on large dimensional random matrix theory when the numbers of antennas at RRHs and users are asymptotically large with a fixed ratio. From simulation results, it is confirmed that the deterministic approximation is accurate and the effect of phase noise is shown to result in a significant reduction in system performance.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124855028","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}
{"title":"Delay-constrained throughput maximization in UAV-enabled OFDM systems","authors":"Qingqing Wu, Rui Zhang","doi":"10.23919/APCC.2017.8304088","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304088","url":null,"abstract":"The use of unmanned aerial vehicles (UAVs) as aerial base stations (BSs) is of great practical significance in future wireless networks, especially for on-demand deployment during a temporary event and emergency situation. Although prior works have demonstrated the performance improvement brought by the UAV mobility, they mainly focus on the delay-tolerant applications such as file transfer and data collection. As such, it is unknown if the UAV mobility is able to provide performance gain for delay-constrained applications, such as video conferencing and online gaming. Motivated by this, we study in this paper a UAV-enabled downlink orthogonal division multiple access (OFDMA) network where a UAV is dispatched to serve two ground users within a given flight period. By taking into account the delay-specified minimum-rate-ratio constraints of the users, our goal is to maximize the minimum user throughput by jointly optimizing the UAV trajectory and communication resource allocation. We show that the max-min user throughput in general decreases as the minimum-rate-ratio constraints become more stringent, which reveals a fundamental tradeoff between the throughput gain by exploiting the UAV mobility and the user delay requirement. Simulation results verify our theoretical findings and also demonstrate the effectiveness of our proposed design.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129388525","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}
{"title":"An efficient sleep/wake-up protocol for localization in impulse wireless sensor networks","authors":"Haruka Kubota, J. Teramae, N. Wakamiya","doi":"10.23919/APCC.2017.8304059","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304059","url":null,"abstract":"Impulse-radio wireless sensor network is a recently proposed concept of wireless sensor network aiming to sense an extended area with high spatial resolution. Extremely simple architecture of the network enables one to install huge number of sensors to the target area. Users of the network are able to precisely estimate location of event-detecting sensor nodes by measuring time of arrivals of impulse signals at anchor nodes. The localization protocol, however, assumes that sensor nodes keep their radio receiver on all the time, which is the main obstacle to reduce energy consumption of the network. To solve the problem, here, we propose a sleep/wake-up protocol of sensor nodes for the network. We show that the protocol can reduces activity of radio receiver of each node by more than 90 % with keeping precision of localization remain intact. We numerically confirm validity of the proposed sleep/wake-up protocol for various conditions including target area with various shape.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"4674 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128162320","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}
Takahiro Ohtomo, H. Yamada, M. Sawahashi, Keisuke Saito
{"title":"Performance of alternately iterative digital self-interference canceler for OFDM using full duplex","authors":"Takahiro Ohtomo, H. Yamada, M. Sawahashi, Keisuke Saito","doi":"10.23919/APCC.2017.8303989","DOIUrl":"https://doi.org/10.23919/APCC.2017.8303989","url":null,"abstract":"In full duplex (FD), which improves frequency efficiency and achieves flexible resource assignment between the uplink and downlink, self-interference (SI) from a transmitter should be suppressed by using antenna isolation, an analog SI canceler, and digital SI canceler (DSIC) to a level such that the data or control channel satisfies the required block error rate (BLER). This paper proposes an alternately iterative DSIC (AI-DSIC) structure for orthogonal frequency division multiplexing (OFDM) using FD. We first present the required SI suppression level considering SI, quantization noise of an analog-to-digital converter, and nonlinear distortions of a power amplifier and RF receiver circuitries for a direct conversion transceiver using FD. Then, we propose an AI-DSIC structure that iterates alternately the generation of the SI estimate, the downlink symbol estimate, and removal of each from the received signal in the downlink including SI. We investigate the average BLER performance of the AI-DSIC for OFDM using FD based on link-level simulations under the condition that the derived required signal-to-SI ratio is satisfied.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130167899","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}
{"title":"Hardware emulation of IoT devices and verification of application behavior","authors":"Yoshiki Kuwabara, T. Yokotani, H. Mukai","doi":"10.23919/APCC.2017.8304040","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304040","url":null,"abstract":"In recent years, the Internet of Things (IoT) systems have been studied and discussed actively. The performance evaluation of IoT systems using hardware emulation is an important topic in Research and development (R&D), because it is prohibitive in terms of resources to use real devices as traffic sources for a large system evaluation of the IoT network. This study proposes an IoT device with traffic generating functions as a hardware emulation of traffic source in an IoT network. The specifications and implementation of the IoT device are presented. Furthermore, the study also proposes application cases for the proposed device in an Intelligent Transport System (ITS).","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126854481","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}
{"title":"Pilot subcarrier feature detection for multi-carrier signals","authors":"Yonghong Zeng, The-Hanh Pham","doi":"10.23919/APCC.2017.8304044","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304044","url":null,"abstract":"Multi-carrier modulation has been widely used in wireless communications. Thus accurately detecting multi-carrier signal is of great importance to dynamic spectrum access and spectrum sharing. In multi-carrier modulation, a common approach for enabling channel estimation and amplitude/phase compensation is to insert pilots on some subcarriers. In this paper the pilot subcarriers are used for the detection of the signal. Two methods are proposed: the average pilot energy detection (APED) and joint time and frequency processing (JTFP). APED uses the property of boosted power at pilot locations in the signal power spectrum density, while JTFP uses the property of repetition of pilots in signal blocks. Frequency offset is a major obstacle to many detection methods. To handle this problem, we propose a low complexity method to compensate the composite frequency offset in time domain. We also use neighborhood search in frequency domain to handle the pilot location change due to the frequency offset. Furthermore, the methods are extended to multi-slot sensing, where the sensing duration is non-continuous and divided into multiple slots. Extensive simulations have been carried out and the results have shown that the JTFP can achieve superior performance without the requirement of time and frequency synchronization.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123409957","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}
Kei Sakuma, Hiromu Asahina, Shuichiro Haruta, I. Sasase
{"title":"Traceroute-based target link flooding attack detection scheme by analyzing hop count to the destination","authors":"Kei Sakuma, Hiromu Asahina, Shuichiro Haruta, I. Sasase","doi":"10.23919/APCC.2017.8304023","DOIUrl":"https://doi.org/10.23919/APCC.2017.8304023","url":null,"abstract":"Recently, the detection of target link flooding attack which is a new type of DDoS (Distributed Denial of Service) is required. Target link flooding attack is used for disconnecting a specific area from the Internet. It is more difficult to detect and mitigate this attack than legacy DDoS since attacking flows do not reach the target region. Among several schemes for target link flooding attack, the scheme focusing on traceroute is gathering attention. The idea behind that is the attacker needs to send traceroute to investigate the topology around targeted region before attack starts. That scheme detects the attack by finding rapid increase of traceroute. However, it cannot work when attacker's traceroute ratio is low. In this paper, we propose traceroute-based target link flooding attack detection scheme by analyzing hop count to the destination. Since the attacker must choose the link flooded to disconnect the target area, the destinations of attacker's traceroutes are concentrated within several hops from the target link while legitimate user's ones are distributed uniformly. By analyzing the number of traceroutes as per hop counts, the change can be emphasized and the attack symptom might be more easily captured. By computer simulations, we first prove the above hypotheses and show that our scheme has more robustness compared with the conventional scheme.","PeriodicalId":320208,"journal":{"name":"2017 23rd Asia-Pacific Conference on Communications (APCC)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126209763","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}