Piggybacking communication by illumination LEDs provides additional valuable functionality to LED lighting fixtures as optical transmitters at little cost. However, joint dimming control and high data-rate requires proper supporting protocols under the bandwidth limitation of LEDs. This paper applies overlapping pulse position modulation (OPPM) achieve capacity flexible dimming. It then analyzes both performance in terms range, flicker severity index, cutoff data rate, power efficiencies,...

Analyzing the time-frequency features of seismic traces plays an important role in stratigraphy analysis and hydrocarbon detection. The current popular time-spectrum methods include short-time Fourier transform, continuous wavelet S-transform, matching pursuit (MP), among which MP is most tolerant window/scalar effect. However, algorithms do not consider interfering effects events on estimation optimal wavelets each decomposition iteration. interfered reflection may result inaccurate during...

Color shift key (CSK) modulation method is a new for visible light communication (VLC) system, which transmits information through the light's color property of multi-color source, typically RGB LED. This paper analyzes illumination and performances CSK signals, including flicker effect, dimming range, rendering index (CRI), luminous efficacy rate (LER), variable data error probability, also generates optimized power weights combination group red, green blue emitted from LED, meet current...

Reconfigurable intelligent surfaces (RISs) are regarded as one of the most promising techniques in sixth-generation (6G) mobile communication networks. With feature smartly tuning electromagnetic environment, RISs provide a possibility for ubiquitous and high-precision localization 6G. However, proper system models large indoor RIS-assisted networks algorithms still missing. In this paper, we propose downlink millimeter-wave (mmWave) framework based on segment-by-segment far-field...

With distinguished advantages over radio frequency communication, visible light communication (VLC) has been considered as one of the potential and promising wireless technologies. However, densely deployed emitting diode (LED) lamps introduce severe inter channel interference (ICI), which drastically deteriorates VLC network performance. In addition, limited access capabilities heterogeneous LED lamps, well different data transmission requirements varied user equipments (UEs), will bring...

A new scheme called differential pulse position width modulation (DPPM+PWM) in wireless optical communication is discussed. Compared to (PPM), it does not need symbol synchronization when receiving signals. And effectively solves the problem of narrow transmitting both (DPPM) and PPM. The structure, power efficiency, bandwidth efficiency error performance are analyzed compared with OOK, PPM, DPPM PWM. Basing on given model, stimulation results show that DPPM+PWM achieves greater ability...

With the development of deep learning techniques, combination with image compression has drawn lots attention. Recently, learned methods had exceeded their classical counterparts in terms rate-distortion performance. However, continuous rate adaptation remains an open question. Some use multiple networks for rates, while others one single model at expense computational complexity increase and performance degradation. In this paper, we propose a continuously adjustable framework, Asymmetric...

In this paper, we investigate joint subchannel assignment and power allocation for the energy efficiency (EE) optimization in an indoor visible light communication (VLC)-Internet of Things (IoT) system with simultaneous lightwave information transfer (SLIPT). A mixed-integer fractional nonlinear programming problem that is challenging to solve formulated. To tackle problem, optimal transmission scheme decomposed into allocation. Firstly, a virtual cell formation (VCF-SA) proposed, which...

This letter presents a model of an indoor light positioning system (LPS) based on white LEDs and camera. The position LPS receiver is determined through both its relative to according their images captured by the camera LEDs' absolute information in navigation frame, obtained visible communication (VLC) link. error performance proposed analyzed. mean square (MSE) estimated using least squares (LS) weighted (WLS) estimators are derived presence non-uniform measurement bias Gaussian noise....

Combining L-level pulse-position modulation (LPPM) and pulse-width (L-PWM), this paper describes a new hybrid scheme, Pulse-Position-Pulse-Width Modulation (PPMPWM), which has relatively low bit error rate, improved power bandwidth efficiencies compared to PPM. The properties of the PPMPWM scheme are investigated thoroughly through simulation show that is effective in these respects.

This paper introduces a convergence scheme for digital video/audio broadcasting (BCT) network and broadband wireless access (BWA) network. supports the architecture based on both PMP topology mesh topology. It works in mode of time division with full spectrum multiplexing. Its frame length, BCT time-slot length BWA are adaptive to arrival traffic whole performance. Then transmission process delay token performance were analyzed. The main method used is M/G/l queue vacation time-limited...

Solar light noise, as the main part of channel noise in outdoor visible communication (VLC) system, would easily saturate photon-detector, and dramatically decrease VLC system performance. A Hilbert-Huang Transformation based solar suppression method is proposed this paper. measurement also designed implemented to verify method's And result shows that it could effectively reduce improve system's stability reliability.

Visible Light Communication (VLC) heterogeneous network (HetNet) combines VLC technology with high data rate and radio frequency wide coverage, has emerged as a highly competitive candidate for future indoor wireless network. However, HetNet often faces resource conffict problem caused by the varied light sources user equipment (UEs). Simultaneously, practical implementation of is further complicated diverse transmission needs various UEs. These have become an obstacle successfully deploying...

The channel model of indoor visible light communication (VLC) is primarily influenced by the receiver's position and orientation. In this study, we decouple effects receiver orientation, treating them as independent random variables. This decoupling enables a clearer understanding how each factor independently influences model. Specifically, focus on impact azimuth angle, critical component VLC channel. We present simplified for systems based partial orientation information. Theoretical...

Wireless communication and broadcasting convergence networks provide a potential solution to greater traffic throughput in the future. In this paper, of network is analyzed based on standardization project for specific requirements local metropolitan area China, referred as broadband wireless multimedia systems. The modeled combination channel multi-access with interference. then given function time resource allocation by calculating capacity maximum optimal are determined delay constraint...