A5101974716- Advanced Wireless Communication Techniques
- Wireless Communication Networks Research
- Advanced MIMO Systems Optimization
- PAPR reduction in OFDM
- Advanced Wireless Communication Technologies
- Cooperative Communication and Network Coding
- Advanced Wireless Network Optimization
- Advanced Adaptive Filtering Techniques
- Wireless Communication Security Techniques
- Energy Harvesting in Wireless Networks
- Radio Frequency Integrated Circuit Design
- Power Line Communications and Noise
- Blind Source Separation Techniques
- Quantum Computing Algorithms and Architecture
- Satellite Communication Systems
- Quantum Information and Cryptography
- Microwave Engineering and Waveguides
- Photonic and Optical Devices
- Indoor and Outdoor Localization Technologies
- Semiconductor Quantum Structures and Devices
- Advancements in PLL and VCO Technologies
- Antenna Design and Analysis
- Error Correcting Code Techniques
- Wireless Body Area Networks
- Digital Filter Design and Implementation
Southeast University
2013-2024
Purple Mountain Laboratories
2020-2024
Jimei University
2024
Southeast University
2020-2021
Abstract The fifth generation (5G) wireless communication networks are being deployed worldwide from 2020 and more capabilities in the process of standardized, such as mass connectivity, ultra-reliability, guaranteed low latency. However, 5G will not meet all requirements future 2030 beyond, sixth (6G) expected to provide global coverage, enhanced spectral/energy/cost efficiency, better intelligence level security, etc. To these requirements, 6G rely on new enabling technologies, i.e., air...
Energy efficiency(EE) has caught more and attention in future wireless communications due to steadily rising energy costs environmental concerns. In this paper, we propose an EE scheme with proportional fairness for the downlink multiuser distributed antenna systems (DAS). Our aim is maximize EE, subject constraints on overall transmit power of each remote access unit (RAU), bit-error rate (BER), data rates. We exploit multi-criteria optimization method systematically investigate...
This letter investigates the tradeoff between energy efficiency (EE) and spectral (SE) in downlink multiuser distributed antenna systems (DAS). Given SE requirement maximum power limit, a constrained optimization problem is formulated to maximize EE. Because of multi-dimensional non-convex nature problem, we first transform multicriteria with high complexity into simpler single objective problem. Then novel allocation algorithm proposed achieve Simulation results demonstrate effectiveness...
Cell edge effect has been recently paid much attention in the development of new generation mobile communications systems because it can cause serious performance degradation cell edge. In this paper, effects traditional cellular and distributed are evaluated compared environments with or without inter-cell interference (ICI). Three metrics proposed to quantify systems. A lower bound is derived on location-specific spectral efficiency collocated antenna system (CAS). Both an approximate...
SUMMARY Energy efficiency (EE) is becoming more and important in future wireless communications because of limited battery power mobile terminals. In this paper, we compare EE the distributed MIMO (D‐MIMO) co‐located (C‐MIMO) uplink systems. Taking into account both circuit transmit power, derive an analytical expression for D‐MIMO C‐MIMO systems a composite Rayleigh‐lognormal channel. What more, optimization algorithm proposed to get optimal values while satisfying given spectral...
We present a scheme for teleporting an unknown three-particle entangled W state from sender to either of two receivers. Two partial states are used as the quantum channel. The success probability teleportation depends on entanglement degree shared states, which equals 4/9 channel composed maximally states. proposed can be generalized transmit m-particle any m-1 receiver and will applied long-distance transmission well.
Satellite communication is an important technology for the coverage of open country, and plays a vital role link channel in remote Internet Things (IoT). However, various kinds IoT terminals may suffer from limited battery capacity computing capability. Therefore, this article proposes new multiuser system design, which satellite used to provide service access points (AP), allow download upload data through APs. Then, AP will exploit simultaneous wireless information power transfer (SWIPT)...
As dominating 6G-standard service, massive ultrareliable low-latency communications (mURLLC) strive to meet the strict requirements of users on latency and error rate. Compared with traditional grant-based random access (GBRA), grant-free (GFRA) allows directly transmit data, which avoid heavy signaling overhead reduce delay. However, pilot collision interference resulting from uncoordinated resource selection in GFRA leads serious transmission failure, especially mURLLC scenarios....
This paper investigates the integration of a reconfigurable intelligent surface (RIS) into secure multiuser massive multiple-input multiple-output (MIMO) system in presence transceiver hardware impairments (HWI), imperfect channel state information (CSI), and spatially correlated channels. We first introduce linear minimum-mean-square error estimation algorithm for aggregate by considering impact HWI RIS phase-shift errors. Then, we derive lower bound achievable ergodic secrecy rate...
Coordinated multipoint has been widely introduced to enhance the capacity, especially that of users at cell edge. Recently energy efficient transmission techniques are increasingly important due increase consumption in wireless communication systems. In this paper, an cooperative algorithm using coordinated beamforming is proposed for multi-cell MIMO networks. We formulate problem as a non-convex optimization fractional form. Then we transform into equivalent form and propose iterative solve...
The characteristics of phase difference in a time-varying channel are analyzed then the Doppler shift multi-path is estimated by calculating expectation square coefficient estimates on effective fingers. Also we recommend an improved estimation method to get high accuracy wide range velocity and SNR (signal-to-noise ratio).
This letter presents an ultra-compact two-stage 60-GHz differential bi-directional amplifier (DBA) design in a 65-nm CMOS process. To satisfy the stability and gain requirements, neutralized common-source cell combined with cross-coupled gm-boosting technique is proposed. In addition, layout-symmetrical coupled line transformer used as inter-stage matching network to achieve broadband operation, reducing insertion loss ensuring identical responses both forward/backward modes. The proposed...
To fully support vertical industries, 5G and its corresponding channel coding are expected to meet requirements of different applications. However, for applications beyond (B5G) such as URLLC, the transmission latency is required be much shorter than that in eMBB. Such further reduced upcoming 6G Therefore, resulting code length reduces drastically. In this case, traditional 1-D suffers a lot from performance degradation fails deliver strong reliability with very low latency. remove...
It is supposed that ultra-reliable low latency communication (uRLLC) would continue to evolve in the future sixth generation (6G) network, provide enhanced capability towards extreme connectivity, with aid of well established multiple-input multiple-output (MIMO) technology. Since constraint can be represented equivalently by blocklength a codeword, channel coding theory at finite plays an important role theoretic analysis uRLLC. Based on Polyanskiy’s and Yang’s asymptotic results maximal...
The phase probability density function (PDF) of the channel coefficients is analyzed for general Clarke model, and close-form expressions are obtained under von Mises/Tikhonov distribution. Then simplified Rayleigh Rice channels derived. In addition, these applied to analyze bias a Doppler shift estimator based on difference proposed firstly by Sheng. theoretic simulation results show good performance consistency this estimator.
Fast and efficient beamforming is crucial for providing reliable service users with high mobility in cell-free millimeter wave (mmWave) systems. This letter offers a novel dynamic framework develops location-aware coordinated algorithm mobile (MUs). Specifically, based on the uplink downlink decoupling technique, we employ fingerprint-based localization method to achieve rapid MUs. Following this, design implemented by deep reinforcement learning (DRL), which utilizes information among...
In this paper, we compare EE of the distributed MIMO (D-MIMO) and co-located (C-MIMO) in uplink cellular systems since mobile stations are battery powered. The total energy consumption includes both circuit transmission energy. We get closed-form expression for D-MIMO C-MIMO systems. What's more, an optimization algorithm is proposed to optimal values while satisfying given spectral efficiency (SE) requirement Simulation results show that more efficient than composite fading channel, value...
In partial-data superimposed training (PDST) scheme, pilot signals are to data symbols, which inevitably introduce interferences between them. order reduce these interferences, we propose an enhanced shifts the positions of and adds them onto symbols with lowest power sum. Simulation results identify availability proposed method in improving accuracy channel estimation degrading symbol error rate (SER).
In this letter, a novel timing offset estimation method is presented for orthogonal frequency division multiplexing (OFDM) systems. The proposed developed on the basis of cyclic structure OFDM symbol and uses new noise subspace based metric to estimate offset. Simulation results show that has significantly higher probability correct than other methods in multipath channels.
[1] Since signal-to-noise ratio (SNR) and Doppler shift are two important channel parameters affecting the reception performance in radio propagation channel, we put forward a joint estimator to estimate very low SNR environments systems. The proposed exploits relation between level crossing rate (LCR) SNR, realizes estimation of through double sampling (DSR) signal processing. Extensive simulations conducted under wide range noise corruption clearly show that our algorithm substantially...
This letter investigates the frequency domain pilot multiplexing technique (FDPMT) for channel estimation of single-carrier equalization (SC-FDE) and proposes a simple position detection to blindly estimate positions in by using noise subspace. Simulation results show that proposed is robust multipath fading channels with exponential power delay profile.
In this paper, we propose an optimal scheme for a distributed antenna system (DAS) to maximize energy efficiency (EE) under constraint of overall transmit power each remote access unit (RAU). We exploit the multicriteria optimization method systematically investigate relationship between EE and spectral (SE). Using weighted sum method, first convert function, which is extremely complex, into simpler single objective function. Then algorithm developed allocate available tradeoff SE...
Reconfigurable intelligent surface (RIS) is a promising solution to build programmable wireless propagation environment through reflecting the incident signals with large number of low-cost passive elements. Recently, novel concept simultaneous transmitting and RIS (STAR-RIS) has been proposed, where can be transmitted reflected users located on different sides surface. Therefore, there are two coefficients that needed configured for each element STAR-RIS. One used adjust phase shifts...