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HTTP Adaptive Streaming (HAS) is rapidly becoming a key video delivery technology for fixed and mobile networks. However, today there is no solution that allows network operators or CDN providers to perform network-based QoE monitoring for HAS sessions. We present a HAS QoE monitoring system, based on data collected in the network, without monitoring information from the client. To retrieve the major...
An adaptive Recursive algorithm based on a simple two sensor system for accurate estimation of the incident angle of a radar reflecting object or alternatively an active emitter is proposed. The overall objective is to find a low complexity method, which provides high resolution estimates and which is capable of adapting to a time varying scenario. Time delay estimation is followed by calculation...
This paper proposes a novel technique to measure temperature and voltage on-chip in field test. It consists of three types of NBTI-tolerant ring oscillator and counters constructed with a standard cell library. Temperature and voltage are estimated with high accuracy and in a short time.
This paper presents a practical channel estimation algorithm based on cyclic orthogonal training sequence for relay-assisted cooperative communication system. In this algorithm, the relay nodes receive the cyclic orthogonal training sequence and circularly shift them to ensure the orthogonality before retransmitting them. It is in low complexity and the destination node can be in a good condition...
In this work, we present an empirical support of an analytical approach which employs a frequency domain analysis for estimating end-to-end delay in multi-hop networks. The proposed analytical results of the end-to-end delay distribution are validated through simulation and compared with queueing based analysis by defining two concrete scenarios. Our results demonstrate that an analytical prediction...
In this paper, we propose a low speed built-in-self-test (BIST) scheme for testing static parameters of high-speed digital-to-analog converter (DAC). Based on under-sampling technique, the DAC output signal is modulated into low speed pulse signal by pulse-width-modulation (PWM) with two sinusoidal carriers. The nonlinearity errors of DAC hence represents on duty ratio of converted pulse signal. In...
Conventional adaptive notch filter based on an infinite impulse response (IIR) filter is well known. However, the IIR adaptive notch filter has a problem of stability due to an IIR filter and bias error due to disturbance. The adaptive notch filter using Fourier sine series (ANFF) is therefore proposed as a stable adaptive notch filter with bias free adaptive algorithm. However, there are problems...
The optimal filtering problem is studied for network control systems subject to random measurement delays without time stamps. With the given probability distribution of the delay, a new measurement model is proposed subject to one measurement only received once and more than one measurement can received at one time. The delayed measurements are written as multiple channel measurements that contain...
To combat Inter-Carrier Interference (ICI) in mobile OFDM systems, ICI can be reconstructed and removed from the received signal with the aid of channel estimation and decision-feedback. Successful ICI cancellation hinges on accurate channel estimation, which includes both the channel gains and ICI gains, the multiplicative coefficients to the neighbor subcarrier signals representing their power leakage...
Efficient bandwidth estimation is significant for Quality of Service (QoS) of multimedia services in IEEE 802.11 WLANs. Many bandwidth estimation solutions have been developed such as probing-based technique and cross-layer scheme. However, these solutions either introduce additional traffic or require modification to the standard protocols. This paper develops a model based bandwidth estimation algorithm...
Detection of Small Delay Defects (SDDs) is a major concern in modern circuits using nanometer technologies. They are difficult to test and an important source of test escapes, and even when SDDs do not produce functional failures, they represent a reliability risk. The detection of these defects aggravates in the presence of process variations. In this paper, a methodology to detect SDDs in the presence...
As the number of frequency domains aggressively grows in today's SOCs, the delivery of high delay test quality across numerous frequency domains while meeting test budgets is crucial. This goal necessitates not only the consideration of fault coverage but also the distinct characteristics of each domain such as frequency and the distribution of path lengths and, additionally, the delay test quality...
This paper deals with the Hybrid Cramer-Rao bound (HCRB) for the estimation of Rayleigh channel and carrier frequency offset (CFO) in data-aided (DA) and non-data-aided (NDA) OFDM systems. The random part (channel) and the deterministic part (CFO) of the hybrid vector to be estimated are statistically independent. The channel estimation function is based on the equivalent discrete-time channel taps...
This work analyzes the impact of medium access control (MAC) layer on the performance of real-time cooperative positioning in ad-hoc mobile wireless networks. The probability mass function (pmf) of the latency introduced by the MAC layer is here derived to assess the influence of MAC parameters on the latency and then operate on those to improve the positioning performance while reducing the number...
Several future wireless communication systems will exploit multiple frequency channels simultaneously to reduce delay, enhance throughput and/or improve robustness. Nevertheless, the impact of multi-channel communications on different applications has not been comprehensively studied even though it is of significant importance to understand the interdependencies between the communication and application...
Field Programmable Gate Arrays (FPGAs) provides fast and low cost implementation of DSP systems. The increasing popularity of FPGAs and lack of experience of the DSP algorithm designers on HDLs, makes the High Level Synthesis tools vital for design, early performance estimation, prototyping, testing and verification. In this paper, we present a high-level design-time verifiable Register-Transfer Level...
Delay mismatch between the input and output signals of power amplifiers (PAs) may lead to an erroneous assumption of memory effects. In adaptive digital predistortion (DPD) system, the delay mismatch affects the accuracy of coefficients estimation and degrades performance of the DPD system. In this paper, we reveal the impact of fractional delay mismatch, and analyze the relationship between delay...
In this paper, we propose an algorithm for timing synchronization that attains fundamental bounds derived by Weiss and Weinstein. These bounds state that, in addition to improving with time-bandwidth product and signal-to-noise ratio (SNR), timing accuracy also improves as the carrier frequency gets larger, if the SNR is above a threshold. Our algorithm essentially follows the logic of the Weiss-Weinstein...
A sensitive receiver operation in multi-access reception is to detect the presence of training signals and identify sources from which the signals are sent, with a certain physical delay and center frequency. This is typically a sequential search, where the receiver tests the presence of specific signals and then acquires synchronization parameters (delays, Dopplers), for each component. In this paper,...
This paper studies the correlogram spectrum estimation method for the case that only a subset of the Nyquist samples is available. The method is able to estimate the spectrum from undersampled data. The bias and variance of the estimator are derived. We also show that there is a tradeoff between the accuracy of the estimation and the frequency resolution. The asymptotic behavior of the estimator is...
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