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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...
360-degree video is on the cusp of going mainstream. Such videos have a large size (4-5⌉ the size of a regular one). Since each viewer has to wear Head-Mounted Display (HMD), screen sharing is impossible when a group is watching the same content. Multiple parallel video-streams will be required to serve a group of viewers along the last mile (think of a family or a group of friends watching...
The parameter estimation for linear parameter varying (LPV) system with dual-rate sampled data in presence of unknown measurement delays is considered in this paper. The local identification approach is adopted and the global LPV model is constructed by synthesizing several local models by using the probability functions. The identification problem is formulated in the scheme of expectation-maximization...
This paper presents a 12.77-MHz low power, RC on-chip relaxation oscillator with self-compensation technique. A digital feedback loop is implemented to maintain the frequency stability. A replica comparator is added to generate a reference pulse width for the compensation. After compensation, the frequency is tuned by a digitally controlled delay element. The proposed design is fabricated in 0.18-μm...
Broadcasting is the most common operation of data transmission in mobile Ad Hoc networks. The conventional blind flooding algorithm incurs the broadcast storm problem. Moreover, energy is critical for the life and the performance of Ad Hoc networks. In order to alleviate the broadcast storm, balance the node energy in network and provide broadcast reliability, a reliable broadcasting algorithm based...
This paper presents a novel Current-Mirror (CM) based Master-Slave Level Conversion Flip Flop (MS-LCFF) to perform data latching and level shifting from sub-threshold voltage, to near-threshold voltage, and up to super-threshold voltage. The CM-based MS-LCFF enables energy-efficient ultra-low-voltage operation by applying dual-supply and multi-supply designs into sub/near-threshold regions. Simulation...
In this paper, we propose a resource allocation scheme for interference management in heterogeneous networks. We particularly consider downlink interference from a Home eNB (HeNB) to macrocell user equipments (MUEs) in the coverage of the traditional macrocell basestation (MBS). By overhearing uplink feedback information from MUEs and Home User Equipments (HUEs) together with downlink control information...
Opportunistic scheduling of delay-tolerant traffic has been shown to substantially improve spectrum efficiency. To encourage users to adopt delay-tolerant scheduling for capacity-improvement, it is critical to provide guarantees in terms of completion time. In this paper, we study application-level scheduling with deadline constraints, where the deadline is pre-specified by users/applications and...
Storage clouds, such as Amazon S3, are being widely used for web services and Internet applications. It has been observed that the delay for retrieving data from and placing data into the clouds is quite random, and exhibits weak correlations between different read/write requests. This inspires us to investigate a key problem: can we reduce the delay by transmitting data replications in parallel or...
Coexistence of various on-body and intra-body biomedical ICs call for the need of inter-device data communication at high speeds with ultra lower power consumption and smaller footprint. To address these needs, this work presents an injection locked clock and data recovery (CDR) circuit in 65 nm CMOS for body channel communication transceivers that employ direct digital transmission. The CDR utilizes...
Three-Dimensional (3D) FPGA as a promising design trend, achieves significant performance improvement over conventional 2D-based FPGA. The maturity of the uni-directional routing architecture design, which achieves 25% area saving in area-delay-product (ADP) over bi-directional routing architectures, has driven major vendors such as Xilinx and Altera to switch to such architecture in their 2D-based...
Many data applications in the next generation cellular networks, such as content precaching and video progressive downloading, require flow-level quality of service (QoS) guarantees. One such requirement is deadline, where the transmission task needs to be completed before the application-specific time. To minimize the number of uncompleted transmission tasks, we study laxity-based scheduling policies...
This paper considers the controlled synchronization of delayed weighted complex dynamical network consisting of heterogeneous nodes. By adding controllers to nodes of the second kind in the model presented consisting of two kinds of nodes, both delay-independent and delay-dependent stability criteria for the controlled synchronization state of the network are derived. It is shown that the stability...
Open-loop unstable systems with time delay are difficult to control using routine control methods. To solve this problem, an improved internal model control scheme, which adds a PD controller to traditional IMC structure, is proposed. Set point tracking performance and robustness can be designed independently. The tuning formula of PD controller is confirmed by a new performance index function. Fuzzy...
In this paper, a class of linear switched systems with time delays is investigated. At the same time, the impulsive effects and parametric uncertainty assumed to be norm-bounded are considered. Some novel exponentially stable criteria are obtained by constructing appropriate Lyapunov-Krasovskii functional. The validity of the results is shown by one numerical example.
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