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| 1 | Energy Efficient MAC Protocol for Wireless Full-Duplex Networks显示文摘The wireless full-duplex(FD) nodes can transmit and receive at the same time using the same frequency-band. Currently, the latest FD media access control(MAC) protocols mainly focus on how to convert the physical layer gains of FD nodes to the throughput gain of wireless FD networks, but pay little attention to the energy consumptions of FD nodes. In this paper, we propose an energy efficient FD MAC protocol. According to the values of self-interference cancellation coefficients corresponding to the nodes of each FD pair and the signal propagation attenuation, the proposed protocol can adaptively select the communication mode of the FD pair between the full-duplex and half-duplex. Also, the minimum transmit power for FD nodes can be obtained to achieve high energy efficiency. We develop an analytical model to characterize the performance of our protocol. The numerical results show that the proposed MAC protocol can optimize the system throughput and reduce the transmission energy consumptions of nodes simultaneously as compared with those of the existing works. | Yu Song Wangdong Qi Wenchi Cheng | 2018 | China Communications2018，15，1： | 2 |
| 2 | Concentric UCAs Based Low-Order OAM for High Capacity in Radio Vortex Wireless Communications显示文摘Due to the potential capacity-boosting for wireless communications,radio vortex wireless communication(RowComm)over orthogonal states/modes of orbital angular momentum(OAM)has been paid much attention to in recent years.A uniform circular array(UCA),as an efficient and convenient antenna structure,can transmit/receive multiple OAM beams with different OAM-modes simultaneously when the transmitter and receiver are aligned.However,for high-order OAMmodes,the OAM beams are divergent accompanied by severe attenuation.Thus,it is difficult to directly use high-order OAM-modes to achieve high capacity for RowComms.To obtain high capacity potentially offered by OAM-modes,in this paper we transform the singular UCA into the concentric UCAs,where high capacity can be achieved using multiple parallel low-order OAM-modes instead of all high-order OAM-modes,to increase the capacity of transmitter-receiver aligned Row-Comms.In particular,we study two cases:1).concentric UCAs based RowComms without co-mode interference;2).concentric UCAs based RowComms with co-mode interference.We propose a co-mode-interference-free and a co-mode-interference-contained mode-decomposition schemes to recover transmitted signals for these two cases,respectively.Additionally,we develop optimal power allocation schemes to maximize the capacity for these two cases.Numerical simulations are presented to validate and evaluate that our developed concentric UCAs based low-order RowComms can significantly increase the capacity as compared with that of singular UCA based RowComms. | Haiyue Jing Wenchi Cheng Zan Li Hailin Zhang | 2018 | Journal of Communications and Information Networks2018，3，4： | 2 |
| 3 | Quality-of-service driven power allocations for wireless full-duplex bidirectional links显示文摘Wireless full-duplex transmission has the potential to double the system throughput compared with the conventional half-duplex transmission.To achieve the maximum potential system throughput,optimal power allocation taking into account quality-of-service(QoS)is urgently needed.In this paper,we propose the QoS driven power allocation schemes for wireless full-duplex bidirectional links.By integrating information theory with the statistical QoS principle,we build two models–local transmit power related self-interference(LTPRS)model and local transmit power unrelated self-interference(LTPUS)model to analyze the wireless full-duplex transmission.For both of these two models,we derive the optimal power allocation schemes,which aim at maximizing the system throughput subject to the given delay-QoS constraint,over wireless bidirectional links with full-duplex transmission.The analyses and numerical results verify that our proposed power allocation scheme can efficiently support diverse QoS requirements over wireless bidirectional links.Our proposed fullduplex QoS driven power allocation schemes can obtain larger effective capacity compared with the conventional half-duplex transmission over wireless bidirectional links. | CHENG WenChi ZHANG HaiLin | 2014 | Science China(Information Sciences)2014，57，4： | 2 |
| 4 | Approximating maximum likelihood performance reduced dimension VBLAST detection algorithm显示文摘SM (spatial multiplexing) can effectively increase the information rate in multiple input multiple output system. BLAST is the typical representation of SM, especially VBLAST, which has some simple de- tection algorithms such as ML, ZF-DFE and ML-DFE, etc. However, the existing algorithms cannot approach ML performance. This paper discusses the effect for detection performance by the correlation of channel ma- trix, proposes a new algorithm-HPML detection algorithm, which can approach ML performance with low complexity. In the new algorithm, we travel the first d layers, and use the DFE procedure for the remaining layers, then perform ML detection for all obtained signals. Simulation results show that HPML can approach ML performance when the traveling numbers are not less than half of the number of transmitting antennas, and the algorithm complexity is smaller than ML. | CHENG WenChi & ZHANG HaiLin State Key Lab of ISN, Xidian University, Xi’an 710071, China | 2010 | Science China(Information Sciences)2010，53，7： | 2 |
| 5 | Fractal Uniform Circular Arrays Based Multi-Orbital-Angular-Momentum-Mode Multiplexing Vortex Radio MIMO显示文摘A radio wave driven by Orbital angular momentum(OAM) is called a vortex radio and has a helical wavefront. The differential helical wavefronts of several vortex radios are closely related to their topological charges or mode numbers. In physics, two or more radio waves with different mode numbers are orthogonal to their azimuth angles. With the development of radio communication technologies, some researchers have been exploring the OAM-based multi-mode multiplexing(multi-OAM-mode multiplexing) technologies in order to enhance the channel spectrum efficiency(SE) of a radio communication system by using the orthogonal properties of vortex radios. After reviewing the reported researches of OAM-based radio communication, we find that some breakthroughs have been made in the combination of OAM and traditional Multi-Input-Multi-Output(MIMO). However, the existing technology is not sufficient to support OAM-based MIMO system to achieve maximum the channel SE. To maximize the spectrum efficiency of OAM-based MIMO system, we present a reused multi-OAM-mode multiplexing vortex radio(RMMVR) MIMO system, which is based on fractal uniform cir-cular arrays(UCAs). The scheme described in this study can effectively combine multiOAM-mode multiplexing with MIMO spatial multiplexing. First, we present the generation of RMMVR MIMO signals. Second, under line-of-sight(LOS) propagation conditions, we derive the channels of the RMMVR MIMO system. Third, we separate the RMMVR MIMO signals using an orthogonal separation method based on full azimuth sampling. Finally, we introduce the method for calculating the channel capacity of the RMMVR MIMO system. Theoretical analysis shows that the scheme proposed in this study is feasible. Moreover, the simulation results show that spatial and mode diversity are obtained by exploiting fractal UCAs. However, to enhance the channel SE of RMMVR MIMO system, an interference cancellation method needs to be introduced for zero-mode vortex radios, and some methods of multi-OAM-mode beams convergence and mode power optimization strategy should be introduced in the future. | Linjun Zhao Hailin Zhang Wenchi Cheng | 2018 | China Communications2018，15，9： | 2 |
| 6 | Heterogeneous Quality of Experience Guarantees Over Wireless Networks显示文摘Quality of experience(Qo E), which is very critical for the experience of users in wireless networks, has been extensively studied. However, due to different human perceptions, quantifying the effective capacity of wireless network subject to diverse Qo E is very difficult, which leads to many new challenges regarding Qo E guarantees in wireless networks. In this paper, we formulate the Qo E guarantees model for cellular wireless networks. Based on the model, we convert the effective capacity maximization problem into the equivalent convex optimization problem. Then, we develop the optimal Qo E-driven power allocation scheme, which can maximize the effective capacity. The obtained simulation results verified our proposed power allocation scheme, showing that the effective capacity can be significantly increased compared with that of traditional Qo E guarantees based schemes. | Jianyu Wang Wenchi Cheng | 2018 | China Communications2018，15，10： | 1 |
| 7 | OAM-Based Hybrid-Duplex Cognitive Frequency Hopping显示文摘In cognitive radio networks,the jamming attacks,which have the same ability with secondary users(SUs)but access the licensed channels without considering the carrier sense multiple access protocol,can disguise a primary user(PU)or SU to occupy the licensed channels,thus resulting in failing to access the licensed channels for PUs and SUs.Employing full/half duplex cognitive frequency hopping(CFH),where users sense the occupancy of licensed channels and then dynamically adjust the hopping parameters,can mitigate the hostile jamming.However,due to the explosive growth of serves and data traffic,it is very difficult to significantly increase the anti-jamming results and achieve high capacities with full/half duplex CFH for both PUs and SUs in cognitive radio networks.To achieve efficient anti-jamming and high capacities for PUs and SUs,in this paper we propose the orbital angular momentum(OAM)-based hybrid-duplex CFH scheme,which jointly uses the half-duplex cooperative sensing and full-duplex transmission modes for PUs and SUs in cognitive radio networks.Using the OAM-based hybrid-duplex CFH scheme,PUs and SUs can identify the occupancy of licensed channels with half-duplex fashion,thus significantly reducing the probability of signals jammed.Then,based on the sensing results,the signals are allowed to be transmitted and received by the same time-slots,carrier frequencies,and OAM-modes.The average capacities of PUs and SUs are derived,respectively.Extensively numerical results show that our proposed OAM-based hybrid-duplex CFH scheme can significantly increase the capacities of PUs and SUs in cognitive radio networks under hostile jamming attacks. | Liping Liang Zan Li Wenchi Cheng Hailin Zhang | 2020 | Journal of Communications and Information Networks2020，5，4： | 0 |
| 8 | Statistical QoS Guarantees for Energy Harvesting Cognitive Radio Networks显示文摘Spectrum and energy resources are very important for the rapidly developing of thefifth generation(5G)wireless communication networks.Cognitive radio and energy harvesting technologies,which focus on the spectrum efficiency and the energy efficiency,respectively,can be jointly used for solving the scarcities of spectrum and energy in energy harvesting cognitive radio networks(EHCRNs),where the energy is absorbed from ambient space and spectrum is licensed to the primary users.However,how to guarantee the quality of service(QoS)for EHCRNs is still a challenging problem.In this paper,we develop the optimal power and rate adaptation scheme under statistical QoS provisioning for EHCRNs.In particular,we analyze the power constraints of EHCRNs.Then,we formulate the effective capacity maximization problem for EHCRNs,solving which we obtain the closedform of the optimal power allocation and rate adaptation scheme under different power constraints.Numerical analyses verify the effective capacity enhancement and validate the relationships among the effective capacity,the QoS exponent,the energy arrival rate,and the average interference power. | Yuquan Xiao Wenchi Cheng | 2020 | Journal of Communications and Information Networks2020，5，1： | 0 |
| 9 | Bifocal-Lens Converging Based OAM Wireless Communications显示文摘Orbital angular momentum(OAM)based radio vortex wireless communications have received much attention recently because it can significantly increase the spectrum efficiency.The uniform circular array(UCA)is a simple antenna structure for high spectrum efficiency radio vortex wireless communications.How-ever,the OAM based electromagnetic waves are vortically hollow and divergent,which may result in the signal loss.Moreover,the divergence of corresponding OAM based electromagnetic wave increases as the order of OAM-mode increases.Therefore,it is difficult to use high-order OAM-mode,because the corresponding received signal-to-noise ratio(SNR)is very small.To overcome the difficulty of high-order OAM modes transmission,in this paper we propose a lens antenna based electromagnetic waves converging scheme,which maintains the angular identification of multiple OAM-modes for radio vortex wireless communications.We further develop a bifocal lens antenna to not only converge the electromagnetic wave,but also compensate the SNR loss on traditional electromagnetic waves.Simulation results show that the proposed bifocal lens can converge the OAM waves into cylinder-like beams,providing an efficient way to in-crease the spectrum efficiency of wireless communications. | Shanghua Gao Wenchi Cheng Hailin Zhang | 2019 | Journal of Communications and Information Networks2019，4，2： | 0 |
| 10 | Caching and D2D Assisted Wireless Emergency Communications Networks with Statistical QoS Provisioning显示文摘Along with natural disasters,the destruction of communication infrastructures leads to the congestion or failure of communication networks.Unmanned aerial vehicles(UAVs),which are with a high flexibility,can be employed as temporary base stations to establish emergency networks.To relieve the backhaul burden of UAVs,some imperative contents can be cached by terrestrial cache-enabled rescuers(CERs)and provide for victims with device-to-device(D2D)transmissions.To support the effectiveness and timeliness of emergency communication,the delay-bounded quality-of-service(QoS)requirement and network throughput are desired to be comprehensively considered,which imposes a new challenge for caching placement and CER deployment.In this paper,we focus on joint caching placement and CER deployment to maximize the effective capacity subject to delay-bounded QoS requirement.The overall non-convex problem is transformed into the caching placement and the CER deployment sub-problems.Then,we develop the QoS-aware caching placement scheme with fixed CER deployment density and obtain the QoS-aware CER deployment density with fixed caching placement.Based on the block-coordinate descent method,we also propose the joint caching placement and CER deployment scheme,which can not only effectively enhance average effective capacity but also guarantee the delay-bounded QoS requirement.Also,numerical simulations are conducted to show the performances of the proposed schemes. | Jianyu Wang Wenchi Cheng Hailin Zhang | 2020 | Journal of Communications and Information Networks2020，5，3： | 0 |
| 11 | RIS-SWIPT for Batteryless Users in Disaster Areas显示文摘For trapped users in disaster areas,the available energy of affected user equipment(UE)is limited due to the breakdown of the ground power system.When complex geographical condition prevents ground emergency vehicles from reaching disaster-stricken areas,unmanned aerial vehicle(UAV)can effectively work as a temporary aerial base station for serving terrestrial trapped users.Simultaneous wireless information and power transfer(SWIPT)system is intriguing for distributed batteryless users(BUs)by transferring data and energy simultaneously.However,how to achieve the maximum energy efficiency(EE)and energy transfer efficiency(ETE)for distributed BUs in UAV-enabled SWIPT systems is not very clear.In this paper,we develop three novel reconfigurable intelligent surface(RIS)-based SWIPT algorithms to solve this nonconvex joint optimization problem using deep reinforcement learning(RL)algorithms.Through the deployment of RIS-assisted UAVs,we aim to maximize the EE along with the ETE via jointly designing the UAV trajectory,the phase matrix,and the power splitting ratio within strict time and energy constraints.The obtained numerical results show that our developed RL-based algorithms can effectively improve the cost time,the average charging rate,data rate,and the EE/ETE performance of the RIS-assisted SWIPT systems as compared with benchmark solutions. | Hanyun Zhang Wenchi Cheng | 2022 | Journal of Communications and Information Networks2022，7，4： | 0 |
| 12 | Statistical QoS Provisioning Architecture for 6G Satellite-Terrestrial Integrated Networks显示文摘The emergence of massive ultra-reliable and low latency communications (mURLLC) as a category of age/time/reliability-sensitive service over 6G wireless networks has received considerable research attention, which has presented unprecedented challenges. As one of the key enablers for 6G,satellite-terrestrial integrated networks (STIN) have been developed to offer more expansive connectivity and comprehensive 3D coverage in space-aerial-terrestrial domains for supporting 6G mission-critical mURLLC applications while fulfilling diverse and rigorous quality of service (QoS) requirements. In the context of these mURLLC-driven satellite services, data freshness assumes paramount importance, as outdated data may engender unpredictable or catastrophic outcomes.To effectively measure data freshness in satellite-terrestrial integrated communications,age of information(AoI)has recently surfaced as a new dimension of QoS metric to support time-sensitive applications. It is crucial to design new analytical models that ensure stringent and diverse QoS metrics bounded by different key parameters,including AoI,delay,and reliability,over 6G satellite-terrestrial integrated networks. However,due to the complicated and dynamic nature of satellite-terrestrial integrated network environments, the research on efficiently defining new statistical QoS provisioning schemes while taking into account varying degrees of freedom has still been in their infancy. To remedy these deficiencies, in this paper we develop statistical QoS provisioning schemes over 6G satellite-terrestrial integrated networks in the finite blocklength regime. Particularly, we firstly introduce and review key technologies for supporting mURLLC.Secondly,we formulate a number of novel fundamental statistical-QoS metrics in the finite blocklength regime.Finally,we conduct a set of simulations to validate and evaluate our developed statistical QoS provisioning schemes over satellite-terrestrial integrated networks. | Jingqing Wang Wenchi Cheng Wei Zhang Hui Liang | 2024 | Journal of Communications and Information Networks2024，9，1： | 0 |
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