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Wireless Access in Vehicular Environments (WAVE) is designed for VANETs to provide safety services and infotainment services through contention-based medium access control (MAC) mechanism. However, the collision probability may increase dramatically in the case of high density of vehicles, due to the contention-based MAC mechanism. To address this issue, we propose a spectrum penetration (i.e., transmit...
In this paper, we present a measurement campaign of indoor massive MIMO channels by using a wideband channel sounder and a rectangular large-scale array with 256 elements. The measurements are conducted at 11 GHz, with a bandwidth of 200 MHz, and the light-of-sight (LOS) scenario is considered. Some basic channel parameters, including shadow fading, delay spread and coherence bandwidth, are extracted...
This paper identifies two energy saving opportunities of Wi-Fi interface emerged during smartphone's screen-off periods. Exploiting the opportunities, we propose a new power saving strategy, BackPSM, for screen-off Wi-Fi communications. BackPSM regulates client to send and receive packets in batches and coordinates multiple clients to communicate at different slots (i.e., beacon interval). The core...
In this paper, we focus on the statistical characteristics of 3D channel propagation in indoor scenario with dense users. Measurements were performed at 3.5 and 6 GHz with 100 MHz by using an uniform cross-polarized rectangular transmitter (Tx) with 32 antennas and a cylindric cross-polarized receiver with 56 antennas. Placing the Tx at two different positions, against the wall which radiates signals...
In this paper, we investigate the statistical characteristics of the three dimensional (3D) multiple- input multiple-output (MIMO) channels and their dependency on the dynamic range in channel impulse responses (CIRs). Our study is based on empirical results obtained from the 3D MIMO channel measurement campaigns at 6 GHz in a typical urban macrocell outdoor-to-indoor scenario. The space-alternating...
The post-silicon tuning introducing programmable delay elements (PDEs) to mitigate the manufacturing variability on the delay is promising. This work presents a novel PDE based on the channel-length decomposition, and reveals that it contributes to the low-power and low-variability comparing with a conventional inverter-chain-type. In addition, in a model of a clock tree along with the PDEs, we propose...
Due to good electrical characteristics and controllability, 3D-FinFET is proved to be a promising substitution of planar poly-gate devices for 20nm technology node and beyond. One of the greatest challenges is to fabricate the Fin and Poly-gate to meet device requirement. This paper describes the photolithography process as one of key solutions to form Fin and Poly-gate structure in 14nm FinFET devices...
This paper gives a brief introduction of a high-speed playback board which has multi-channel synchronization function. FPGA is controller and AD9739 is playback chip. By choosing hardware and configuring software, the board can be used as single-channel, dual-channel, three-channel and four-channel data playback board. When the operating mode is selected as a channel with four paths, playback rate...
Demand response has been recognized as an essential element of the smart grid. Frequency response, regulation and contingency reserve functions performed traditionally by generators are now starting to involve demand side resources. Additional benefits from demand response include peak reduction and load shifting, which will defer new infrastructure investment and improve generator operation efficiency...
The purpose of this paper is to investigate the impulsive exponential stabilization for the positive equilibrium points of a class of discrete population growth models with time delays. By using Lyapunov functionals, some new exponential stability criteria are given. It is shown that impulses can indeed make unstable equilibrium points exponentially stable, and when the impulses are employed to stabilize...
In this paper, stability of delay discrete impulsive systems in which the state variables on the impulses are related to the time delay is investigated. And a number of stability criteria are obtained by using Lyapunov functions and Razumikhin technique. Two examples are also presented to illustrate the efficiency of the obtained results.
This paper focused on the research on one-step-delay effect of the stability of digital control PWM Inverter. Discrete stability criterion is used to research the stability of discrete system with/without one-step-delay control respectively. The research results are shown that the one-step-delay control degrades the stability system in the high sample frequency while it may increase the stability...
Compared with analog control, digital control adopted in PWM inverter possesses the evident advantages but the traditional PID control strategy which is realized in digital method often can't achieve better performance than in analog control. In past references, there is hardly quantitative analysis on the effect of digital process on the performance of PWM inverter. This paper did a creative research...
In this paper, a parallel interpolation structure for all-digital receiver is proposed. Unlike the existing serial interpolation method, which makes timing-adjustment for one sample at a time, the single-symbol parallel interpolation makes timing adjustment for one symbol at a time. This trait lightens the hardware-constraint to the processing rate of the interpolator, and in turn, improves the processing...
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