Spatial multiplexing techniques send independent data streams on different transmit antennas to maximally exploit the capacity of multiple-input multiple-output (MIMO) fading channels. Most existing are based an idealized MIMO channel model representing a rich scattering environment. Realistic channels corresponding clusters exhibit correlated and can significantly compromise performance such techniques. In this paper, we study design spatial virtual representation realistic Since...

The dramatic linear increase in ergodic capacity with the number of antennas promised by multiple-input multiple-output (MIMO) wireless communication systems is based on idealized channel models representing a rich scattering environment. Is such scaling sustainable realistic scenarios? Existing physical models, although realistic, are intractable for addressing this problem analytically due to their complicated nonlinear dependence propagation path parameters, as angles arrival and delays....

Mobile data networks such as 3G and LTE exhibit properties that are fundamentally different from those of fixed networks. These differences result in severe performance bottlenecks current Transmission Control Protocol (TCP) implementations, which the foundation for most today's mobile applications. This work addresses this challenge by developing a transparent protocol optimization device to perform on-the-fly improve TCP's throughput while maintaining full compatibility with end-host TCP...

Fueled by the emerging short video applications (e.g., TikTok), streaming short-form videos nowadays is ubiquitous among mobile users. During viewing, one common action to scroll screen switch videos, which a handy operation for viewers quickly search content of interest. However, our empirical measurements reveal that frequent switching can result in nearly half data quota being used transferring never watched. This problem called loss this work. Given immense cost network infrastructure,...

Most client hosts are equipped with multiple network interfaces (e.g., WiFi and cellular networks). Simultaneous access of can significantly improve the users' quality experience (QoE) in video streaming. An intuitive approach to achieve it is use Multi-path TCP (MPTCP). However, deployment MPTCP, especially link preference, requires OS kernel update at both server side, a vast amount commercial content providers do not support MPTCP. Thus, this paper, we realize multi-path streaming...

Abstract Presently, Radar Target Simulator (RTS) has become a key instrument in the research and development process of automotive millimeter-wave radar. However, amplitude-phase distortion resulting from non-ideal electronic components can impact its accuracy simulating real traffic targets. This paper analyzes individual effects amplitude phase on range profile simulated targets RTS. Results be used for design RTS systems.

Enabling multiple paths in datacenter networks is a common practice to improve the performance and robustness. Multi-path TCP (MPTCP) explores by splitting single flow into subflows. The number of subflows MPTCP determined before connection established, it usually remains unchanged during lifetime that connection. While improves both bandwidth efficiency network reliability, more incur additional overhead, especially for small (so-called mice) Additionally, difficult choose appropriate each...

Memory disaggregation is a promising direction to mitigate memory contention in datacenters. To make practical, prior efforts expose remote applications transparently via virtual subsystem's swapping interface. However, due the semantic gap between OS and – cannot know accessing sequences of an application but page faults. This approach has two limitations. First, it learns little from faults' access history, which leads sub-optimal prefetching predictions. Second, fault can still occur even...

Mobile video streaming is now ubiquitous among mobile users. This work investigates a less studied and yet significant problem in – data wastage, i.e., some downloaded may not be played back but discarded by players due to early departure or skip, thus the bandwidth consumed transferring them wasted. Our measurements show that wastage practice, e.g., 25.2 percent∼51.7 percent of are fact Moreover, substantial exists only current commercial platforms, also state-of-the-art adaptive systems...

Two-dimensional cross-phase grating (CPG), diffracting the incident wave into (+1,+1 ), (+1,−1 (−1,−1 and (−1,+1 ) orders diffraction light, is used as a wavefront shearing element in lateral interferometer. However, manufacture errors always exist, they produce unwanted process of CPG manufacture. The appearance will increase background noise interferogram may affect accuracy analysis. So, it necessary to analyze influences determine tolerances remove effect. A method based on Fourier...

Fueled by emerging short video applications (e.g., TikTok), streaming videos is now ubiquitous among mobile users. A major problem in data wastage, i.e., the downloaded not watched but discarded due to switching, so bandwidth consumed transferring wasted. Our measurements show that 45.2% of wasted practice, which a significant proportion can lead tremendous financial loss. To tackle problem, this work develops novel algorithm called Wastage Aware Streaming (WAS) learns viewing behaviors and...

This paper investigates the performance of TCP in mobile data networks and proposes a novel approach to address problem optimizing transport protocol for these - network-centric approach. We propose realize optimizations within network by means deploying network-layer device called accelerator, which performs on-the-fly improve performance, without requiring any modification server or client implementations OS. Our extensive experiments conducted production 3G/HSPA LTE show that proposed...

Recently, a large number of studies have concentrated on aging transition, but they so far been restricted to coupled integer-order oscillators. Here, we report the first study transition in mixed active and inactive fractional-order It has demonstrated that while heterogeneity is caused by distance parameter, both coupling strength derivative can modulate critical ratio at which occurs. In addition, small may ruin ability oscillation and, thus, reduce globally Stuart-Landau Remarkably,...

Software reliability testing refers to various software activities that are driven achieve a quantitative goal given priori or lead assessment for the under test. In this paper we develop modeling framework process, comprising simplifying model and generalized model. both models action selection process defect removal mechanism explicitly described. Both discrete-time domain continuous-time involved. The is more accurate realistic than since former avoids assumption defects equally...

East-ADL is an architectural description language dedicated to safety-critical automotive embedded system design. We have previously modified East-adl include energy constraints and transformed energy-aware real-time behavioral in into analyzable Uppaal models. In this paper, we extend our previous work by including support for Stateflow, which used design event-driven systems via hierarchical state machines flow charts. However, Stateflow provides limited formal analysis often suffers from...

For extreme ultraviolet lithography (EUVL) targeting 45 nm technology generation and beyond, thermal absorption is the main source of multilayer-coated mirror structural deformation, which will finally cause degradation lithographic performance. It becomes necessary to consider issue in design phase volume production tool. Utilizing several commercial in-house software packages, we have performed a complete transient thermo-mechanical analysis such effects its impact on optical performance...

To realize in-situ wavefront aberration measurement of hypernumerical aperture projection optics, a cross-phase grating lateral shearing interferometer (HNA-CPGLSI) is proposed. achieve high-wavefront accuracy, accurate alignment HNA-CPGLSI essential. Misalignments include collimation grating, and CCD. Misalignment optics mainly produces defocus aberration. After the CPGLSI formed by CCD accurately aligned, easy to measuring controlling So misalignments effects analysis are focused. Using...

With significant advantages in capacity, power consumption, and price, solid state disk (SSD) has good potential to be employed as an extension of DRAM (memory), such that applications with large working sets could run efficiently on a modestly configured system. While initial results reported recent works show promising prospects for this use SSD by incorporating it into the management virtual memory, frequent writes from write-intensive programs quickly wear out SSD, making idea less...