{"title":"Low-complexity Calibration Scheme of Channel Reciprocity for Massive MIMO-OFDM System with IQ Imbalance","authors":"Jing Sun, Yan Liang, Ting Li, Wei Ji, Fei Li","doi":"10.1109/PIMRC.2019.8904399","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904399","url":null,"abstract":"Massive multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) is one of the promising technology for the fifth generation of wireless communications. As a major radio-frequency impairment, in-phase and quadrature-phase (IQ) imbalance tends to destroy the channel reciprocity and degrade the performance of time division duplex (TDD) massive MIMO-OFDM system. In this paper, a calibration scheme is proposed to restore the channel reciprocity for TDD massive MIMO-OFDM system with IQ imbalance. Two calibration matrices are designed to compensate the uplink and downlink transmission respectively. A low-complexity estimation method of calibration matrices is also proposed in this paper. Numerical results confirm that the proposed scheme can restore the channel reciprocity and provide reliable performance.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"553 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122373514","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}
L. Mohjazi, Lina Bariah, S. Muhaidat, P. Sofotasios, Oluwakayode Onireti, M. Imran
{"title":"Error Probability Analysis of Non-Orthogonal Multiple Access for Relaying Networks with Residual Hardware Impairments","authors":"L. Mohjazi, Lina Bariah, S. Muhaidat, P. Sofotasios, Oluwakayode Onireti, M. Imran","doi":"10.1109/PIMRC.2019.8904444","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904444","url":null,"abstract":"In this paper, we quantify the effect of residual hardware impairments (RHI) on the error rate performance of a relay-based non-orthogonal multiple access (NOMA) system, where the communication between a source node and multiple users is completed via an amplify-and-forward (AF) relay node. In particular, we focus on the pairwise error probability (PEP) analysis and derive an accurate PEP approximation to characterize the performance of NOMA users under Rayleigh fading channels. The derived PEP expression is then exploited to investigate the diversity gain and the union bound on the bit error rate (BER) of the underlying system. Our results demonstrate that the presence of RHI causes an error floor at high signal-to-noise ratio (SNR) values. This error floor yields a detrimental effect on the achievable diversity order of NOMA users, where it is shown that the diversity order of all users converges to zero.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126920285","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":"Filtering for Uplink Non-Orthogonal Multiple Access with Imperfect Received Power Control","authors":"Çağrı Göken, Onur Dizdar, Alptekin Yilmaz","doi":"10.1109/PIMRC.2019.8904411","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904411","url":null,"abstract":"In this work, we propose a low-complexity enhancement for uplink non-orthogonal multiple access (NOMA). The proposed scheme, called Filtered NOMA (F-NOMA) aims to improve the error performance for scenarios in which the received user powers cannot be controlled perfectly at the receiver. The proposed scheme benefits from the uniqueness of the frequency spectrums of the superimposed signals to detect the signals of multiplexed users at the receiver. We demonstrate that the proposed scheme improves the error performance of uplink power-domain NOMA significantly and increases the number of supported users. We also show that the scheme also brings an improvement in the error performance of other uplink NOMA methods, which already benefit from different types of user specific signatures.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130710748","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":"Time Precoding Enabled Non-Orthogonal Frequency Division Multiplexing","authors":"Waseem Ozan, P. Haigh, Bo Tan, I. Darwazeh","doi":"10.1109/PIMRC.2019.8904402","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904402","url":null,"abstract":"In this paper, we propose a time precoding scheme for cancelling inter-carrier interference in non-orthogonal frequency division multiplexing for the first time. Achieving high spectral efficiencies is a recurring and key challenge in wireless communications systems and researchers generally use high order and advanced modulation formats to approach this problem, in particular, non-orthogonal modulation formats are a topic of particular interest. Fast orthogonal frequency division multiplexing (F-OFDM) doubles the throughput of conventional OFDM by violating orthogonality of the quadrature carrier, causing interference in the real and imaginary domains. Here, we propose a precoding scheme that enables self-interference cancellation without the need of the interference level calculation. The proposed scheme is implemented in the context of a narrowband internet-of-things (NB-IoT) system and verified on a software define radio (SDR) testbed with realistic AWGN and multiple path channels from channel emulator for concept proving. By comparing with the standard OFDM transmission, the time precoded F-OFDM outperforms around 3dB by BER with same signal-to-ratio (SNR) level.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132463322","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":"Robust Neighbor Discovery Through SideLink Demodulation Reference Signal for LTE ProSe Network","authors":"Leila Nasraoui, S. Ikki","doi":"10.1109/PIMRC.2019.8904158","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904158","url":null,"abstract":"By introducing the Proximity Services (ProSe) functionalities in its 12th release, the 3rd Generation Partnership Project (3GPP) made possible the ability to perform device-to-device (D2D) communication in Long Term Evolution-Advanced (LTE-A) cellular network. Direct communication between nearby User Equipments (UEs) is then enabled through the newly introduced sidelink. This paper investigates neighbor discovery for D2D communication exploiting Demodulation Reference Signals (DMRS), which are associated with physical sidelink channels for coherent demodulation. By simply listening to its sidelink signal, a ProSe-enabled UE can identify its peers and initiate a direct link without any additional overhead. The study examines the properties of DMRS sequences and proposes a robust neighbor discovery scheme tailored to DMRS structure based on a power normalized correlation process. A reduction in the computational load required to establish a link between two neighbors is proposed and evaluated. Simulation results show that nearby users can be discovered with a reasonable complexity while achieving a high discovery accuracy.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131971094","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":"Robust Spatio-Temporal Partial-Response Signaling over a Frequency-Selective Fading MIMO Channel with Imperfect CSI","authors":"J. Bailleul, L. Jacobs, M. Guenach, M. Moeneclaey","doi":"10.1109/PIMRC.2019.8904263","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904263","url":null,"abstract":"Partial-response signaling is known to facilitate the equalizer design because a controlled amount of residual interference is permitted. The design of the target impulse response of the partial-response precoder often assumes perfect channel state information, which is unfortunately not available at the transmitter in most practical applications. Consequently, this contribution focuses instead on the robust and joint design of a spatio-temporal target impulse response and the equalization coefficients for a frequency-selective fading multiple-input multiple-output communication channel based on current and/or previous noisy channel estimates. More precisely, the error in the channel estimates is statistically modeled, and robustness is achieved by minimizing the mean-squared estimation error averaged over the joint distribution of the actual channel and the available channel estimates. Numerical results of the bit error rate confirm that the proposed robust partial-response signaling not only provides a significant performance gain compared to traditional full-response signaling, but also outperforms the naive approach, which ignores channel estimation errors.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132178451","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}
Ahmad Fadel, Ahmad Nimr, Hsiao-Lan Chiang, Marwa Chafii, Bernard A. Cousin
{"title":"Cross-Layer Multi-User Selection in 5G Heterogeneous Networks Based on Hybrid Beamforming Optimization for Millimeter-Wave","authors":"Ahmad Fadel, Ahmad Nimr, Hsiao-Lan Chiang, Marwa Chafii, Bernard A. Cousin","doi":"10.1109/PIMRC.2019.8904337","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904337","url":null,"abstract":"Lack of coordination between network layers limits the performance of most proposed solution for new challenges posed by wireless networks. To overcome such limitations, cross-layer physical and medium access (PHY-MAC) design for multi-input-multi-output orthogonal frequency division multiple access system in heterogeneous networks (HetNETs) is proposed. In this paper, we formulate an optimization problem for hybrid beamforming, in a multi-user HetNET scenario aiming to maximize the total system throughput. Furthermore, analog beamforming is selected from a codebook containing a limited number of candidates for steering vectors. The proposed problem is non-convex and hard to solve. Thus it is relaxed by transforming it into a subtraction form of two convex funcions. Afterward we apply a group of well-known metaheuristic algorithms to calculate the normalized hybrid beamforming vectors. The optimal solution is obtained using an exhaustive search (ES) algorithm that provides an ideal solution, but with high complexity. In addition, zero-forcing-based approach (ZFA), matched filter (MF), and QR-based approach (QR) are applied to get quick sub-optimal solutions. Hence, we analyze the performance of our systems using the throughput metric. The simulation results show that QR algorithm outperforms ZFA and MF in low and middle signal-tonoise ratio (SNR) regime, while ZFA outperforms QR and MF at higher SNRs. Moreover, QR is close to the optimal solution ES.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132178635","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":"User-Centric Online Learning of Power Allocation in H-CRAN","authors":"Meruyert Makhanbet, Tiejun Lv","doi":"10.1109/PIMRC.2019.8904131","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904131","url":null,"abstract":"In this paper, we investigate a power control of uplink connection in Heterogeneous Cloud-Radio Access Network (H-CRAN). Our main objective is to optimize Online Energy-Efficiency (OEE) from the users’ perspective. Firstly, a realistic and new model of the Long-Term Evolution (LTE) user device’s power consumption is proposed. This model includes the power used for operating modes and signal processing of mobile devices during the uplink data transmission. Secondly, the optimization problem is formulated by maximizing the OEE function subject to each user’s quality-of-service (QoS) and a power constraint. Then, we allocate online power for the OEE by jointly optimizing the Macro Base Station (MBS) users and small cell Radio Remote Heads (RRHs) users. Furthermore, the Online Frank-Wolfe (OFW) method is adopted to obtain the optimal solution for the formulated OEE optimization problem. The regret metric is derived to describe the performance of the OFW. Finally, numerical results validate the accuracy of the proposed power model and demonstrate the superiority of the proposed method compared to the benchmark.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127887974","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":"GFDM-Modulated Full-Duplex Cognitive Radio Networks in the Presence of RF Impairments","authors":"Amirhossein Mohammadian, C. Tellambura","doi":"10.1109/PIMRC.2019.8904423","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904423","url":null,"abstract":"This paper investigates the problem of sum rate maximization for a full-duplex (FD) generalized frequency division multiplexing (GFDM) based secondary user (SU) link, operating in a spectrum hole. The right and left adjacent channels of the spectrum hole have two active primary users (PUs), and thus adjacent channel interference (ACI) on them must be below a threshold. For SU link, radio frequency (RF) impairments including phase noise, in-phase (I) and quadrature (Q) imbalance, and carrier frequency offset (CFO) are considered and analog domain and digital domain self-interference (SI) cancellation techniques are applied. We consider two cases: (1) two independent oscillators for local transmitter and receiver, (2) single shared oscillator between them. We derive the powers of residual SI, desired signal and noise and signal-to-interference-plus noise ratio (SINR). Furthermore, power spectral density (PSD) of FD transmitter is calculated and ACI is formulated. By using successive convex approximation, sum rate maximization problem subject to ACI limits on adjacent PUs is defined and solved. Finally, we show that FD GFDM for the SU link can achieve twice higher sum rate than FD orthogonal frequency division multiplexing (OFDM).","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128998233","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":"Synergetic Node of Edge Computing and Hybrid Fibre-Wireless (FiWi) Access Networks for IoT","authors":"Hongxing Li, Guochu Shou","doi":"10.1109/PIMRC.2019.8904388","DOIUrl":"https://doi.org/10.1109/PIMRC.2019.8904388","url":null,"abstract":"The fast-evolving Internet of Things (IoT) requires reliable and flexible networks and low-latency computing to connect billions or even trillions of edge devices and deal with the vast amount of data generated by them at high speed. This situation poised to induce a significant change to the current network architecture and cloud computing. This paper proposes a new design of fiber-wireless (FiWi) node which integrated with computing, storage for IoT, and virtualization is introduced to manage the networking and computing resources. Analytical results demonstrate that its effectiveness on switching reaches the level of hardware switches and can provide low-latency cloud service for IoT applications based on low-cost and low-power computing devices. Additionally, a use case using the FiWi access networks as a sensor is given to show the advantages of the FiWi ECN.","PeriodicalId":412182,"journal":{"name":"2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)","volume":"1641 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129278920","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}