In this paper, the problem of outer beamformer design based only on channel statistic information is considered for two-stage beamforming multi-user massive MIMO downlink, and approached signal-to-leakage-plus-noise ratio (SLNR). To eliminate dependence instantaneous state information, a lower bound average SLNR derived by assuming zero-forcing (ZF) inner beamforming, an method that maximizes proposed. It shown proposed SLNR-based reduces to trace quotient (TQP), which often encountered in...

In this paper, the outage probability and outage-based beam design for multiple-input multiple-output (MIMO) interference channels are considered. First, closed-form expressions in MIMO derived under assumption of Gaussian-distributed channel state information (CSI) error, asymptotic behavior as a function several system parameters is examined by using Chernoff bound. It shown that decreases exponentially with respect to quality CSI measured inverse mean square error CSI. Second, based on...

In this paper, the pilot signal design for massive MIMO systems to maximize training-based received signal-to-noise ratio (SNR) is considered under two channel models: block Gauss-Markov and independent identically distributed (i.i.d.) models. First, it shown that model, optimal problem reduces a semi-definite programming (SDP) problem, which can be solved numerically by standard convex optimization tool. Second, i.i.d. an solution obtained in closed form. Numerical results show proposed...

Omnidirectional videos capture environmental scenes effectively, but they have rarely been used for geometry reconstruction. In this work, we propose an egocentric 3D reconstruction method that can acquire scene with high accuracy from a short omnidirectional video. To end, first estimate per-frame depth using spherical disparity network. We then fuse estimates into novel binoctree data structure is specifically designed to tolerate estimation errors. By subdividing the space binary tree and...

In this paper, the filter-and-forward (FF) relay design for orthogonal frequency-division multiplexing (OFDM) transmission systems is considered improving system performance over simple amplify-and-forward (AF) relaying. Unlike conventional OFDM relays performing demodulation and remodulation, to reduce processing complexity, proposed FF directly filters incoming signal in time domain with a finite impulse response (FIR) forwards filtered destination. Three criteria are optimizing filter....

Recent differentiable rendering techniques have become key tools to tackle many inverse problems in graphics and vision. Existing models, however, assume steady-state light transport, i.e., infinite speed of light. While this is a safe assumption for applications, recent advances ultrafast imaging leverage the wealth information that can be extracted from exact time flight In context, physically-based transient allows efficiently simulate analyze transport considering indeed finite. paper,...

Dual-pixel photography is monocular RGB-D with an ultra-high resolution, enabling many applications in computational photography. However, there are still several challenges to fully utilizing dual-pixel Unlike the conventional stereo pair, dual pixel exhibits a bidirectional disparity that includes positive and negative values, depending on focus plane depth image. Furthermore, capturing wide range of requires shallow field, resulting severely blurred image, degrading estimation...

The objective of polarization rendering is to simulate the interaction light with materials exhibiting polarization-dependent behavior. However, integrating into challenging and increases computational costs significantly. primary difficulty lies in efficiently modeling computing complex reflection phenomena associated polarized light. Specifically, frequency-domain analysis, essential for efficient environment lighting storage interactions, lacking. To reproduce interactions using...

In this paper, the filter-and-forward (FF) relay design for multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems is investigated. Due to considered MIMO structure, FF investigated in framework of joint together with linear transceiver. As criterion, first, minimization weighted sum mean square error (MSE) considered. The case approached based on alternating optimization that iterates between optimal given precoding and decoding matrices a filter....

In this paper, adaptive pilot beam sequence design for channel estimation in large millimeter-wave (mmWave) MIMO systems is considered. By exploiting the sparsity of mmWave channels with virtual representation and imposing a Markovian random walk assumption on physical movement line-of-sight (LOS) reflection clusters, it shown that sparse problem reduces to sequential detection finds locations values non-zero-valued bins two-dimensional rectangular grid, optimal can be cast into framework...

The research detailed in this paper scrutinizes Principal Component Analysis (PCA), a seminal method employed statistics and machine learning for the purpose of reducing data dimensionality. Singular Value Decomposition (SVD) is often as primary means computing PCA, process that indispensably includes step centering - subtraction mean location from set. In our study, we delve into exploration influence critical yet ignored or downplayed step. Our meticulously investigates conditions under...

Reactive distillation (RD) provides notable advantages over conventional processes, regarding reduced energy requirements and CO2 emissions. However, as the benefits of RD may not be universally applicable, a comprehensive feasibility assessment is necessary. This study introduced an automated evaluation procedure for column using AI-based region recognition approach, reducing reliance on expert knowledge heuristics in graphical methods. Through k-means clustering-based image segmentation,...

An automatic top-view transformation method is presented for a vehicle backup rear-view camera. The proposed consists of two steps: i) corresponding points estimation based on the lens specification and ii) view direct linear transform algorithm. Major contribution this work that optimized rear camera system. can be applied to various imaging systems, such as automotive intelligent surveillance cameras.

We propose a Scene Text Recognition (STR) system for recognizing text contained in natural images. The is comprehensive of all three steps STR - localization, extraction and recognition making it easily applicable to mobile devices. methods each step are adopted tuned from previous works be more suitable STR. Since computationally intensive, order give faster results the user, we seek utilize computing power multicore processors. A multigrain parallelism method proposed which varies level...

Acquisition and modeling of polarized light reflection scattering help reveal the shape, structure, physical characteristics an object, which is increasingly important in computer graphics. However, current polarimetric acquisition systems are limited to static opaque objects. Human faces, on other hand, present a particularly difficult challenge, given their complex structure reflectance properties, strong presence spatially-varying subsurface scattering, dynamic nature. We new method for...

In this paper, the weighted sum outage-rate maximization for time-invariant multiple-input multiple-output (MIMO) interference channels is considered. The cumulative distribution function (CDF) of outage events in MIMO characterized under assumption Gaussian channel uncertainty. Based on derived expression probability an iterative beam design algorithm maximizing constraints newly proposed. Numerical results show that proposed shows good performance.

In this paper, the filter-and-forward (FF) relay design for orthogonal frequency-division multiplexing (OFDM) transmission systems is considered to improve system performance over simple amplify-and-forward (AF) relaying. Unlike conventional OFDM relays performing demodulation and remodulation, reduce processing complexity, proposed FF directly filters incoming signal in time domain with a finite impulse response (FIR) forwards filtered destination. Three criteria are optimize filter. The...

초박형 라이트필드 카메라 시스템은이미지 센서 위에 렌즈 어레이를 부착하는 방식으로 만들어진다. 이러한 라이트 필드 카메라는 하나의이미지 센서를 여러 개의 sub-aperture가 나눠쓰는 되어있어 개별 이미지의 분해능이 낮으며, sub-aperture 이미지들을 융합해 추가적인 분해능 향상이 수행되어야 한다. 본 연구에서는 시스 템을 개발했으며, 개발된 시스템을위한 실시간 향상 알고리즘을 개발, 실험을 통해 검증했다. 두께 2mm, 24개(6 × 4)의 551 해상도의 sub-aperture로 구성되어 있으며, 임베디드 컴퓨팅 보드를 사용해 휴대가가능하도록 제작되었다. 알고리즘은임베디드 보드의 GPU에서 병렬처리를 라플라시안 피라미드 기반의이미지 융합 수행한다. 검증한 결과로, 개발 시스템은 MTF50값이 평균 35% 정도 개선되었으며, 10.65fps의 처리속도로 처리가가능함을 확인했다.