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A maximum likelihood-based code-aided joint carrier phase estimation and ambiguity resolution algorithm is proposed for coded amplitude and phase shift keying (APSK) signals. The proposed estimator iteratively uses the a posteriori probability of coded bits obtained from the channel decoder to improve the performance of phase estimation and ambiguity resolution. Two initialization schemes are employed...
Licensed-Assisted Access (LAA) which allows LTE to be deployed in unlicensed spectrum is a promising technique currently under standardization in 3GPP Rel-13. To guarantee a peaceful coexistence of LAA with the incumbent systems such as WiFi, listen-before-talk (LBT) which requires the node to sense the medium before data transmission is introduced. On the other hand, LBT also prevents simultaneous...
As a kind of auxiliary facility, countdown display units for traffic lights have been widely used in China. It can display the remaining time of the corresponding traffic light, so that road users can know the real-time change of the traffic signals. However, since the old national standard for countdown display units lacks unified setting requirements for countdown display units, the setting of countdown...
In this paper, we study the time of arrival (TOA)-based distributed passive localization in asynchronous wireless network. Performing synchronization between receivers before target localization is possible but costs extra energy and bandwidth. To this end, We propose an expectation maximization (EM) algorithm to locate the passive target in the presence of receivers' clock offsets. To improve the...
We consider an asynchronous sensor network where target sensors aim to locate themselves unambiguously. Timing information is a vital requirement for time-based localization. Joint localization and synchronization estimation can improve position accuracy and reduce both communication overhead and power cost. In this paper, a novel distributed cooperative joint localization and synchronization algorithm...
This paper proposes a novel wide area back-up protection algorithm that measures synchronized information from different buses in region. The amplitude of voltage fault component from different buses is compared, and the bus with maximum magnitude will be selected. Hence, suspected fault line set could be established according to the sub-graph and complete incidence matrix of selected buses. Then,...
In this paper, the acquisition performances of different detectors are investigated and evaluated for frame acquisition in DVB-S2 system. Mean acquisition time in both single-dwell and multi-dwell procedures are derived based on a Markov chain model. Since it is quite complicated to analyze some parameters in close formula, a semi-analytical method is adopted to simplify the analysis. Performance...
By making use of the characteristic of the cost function MSSO (Mean of the Square Soft Outputs), a new method of carrier phase synchronization and decoding for the turbo-coded systems is presented. Firstly, a short training sequence is used to achieve the initial phase estimation and to narrow the phase searching range. Secondly, three decoding sequences with the largest MSSO values are chosen by...
In this paper, we consider the effect of different rules of symbol decision on the performance of decision-directed synchronizers for LDPC-coded systems. Different from the conventional hard symbol decision based on the Maximum-A- Posteriori (MAP) criterion, soft symbol decision can be considered as the Minimum-Mean-Square-Error (MMSE) estimation of the transmitted symbol. By whether or not the coding...
For the symbol timing recovery techniques which are susceptible to carrier phase offset, clockless phase recovery is necessary in advance. In this paper, we propose a clockless nondata-aided (NDA) feedback phase error detector (PED) for M-ary phase-shift keying (MPSK) signal. Its derivation is given based on maximum likelihood (ML) criterion. The clockless NDA (Mthpower)PED can also be generalized...
In this paper, we apply those Hindmarsh-Rose(HR) neural networks, which add time-lag. By numerical simulations, based on the same stimulating parameters, we conclude that the network developed into de-synchronization more quickly and easily. Furthermore, we find it exits an optimal stimulation interval as well as other stimulating parameters. Those phenomena are important to guide us to understand...
An improved data-aided (DA) frequency error detector (FED) and a frequency lock detector are proposed under large frequency offset for Digital Video Broadcasting Satellite Second Generation (DVB-S2) system. Computer simulations results show that the proposed error detector can increase the frequency acquisition range and decrease the acquisition time without complexity increase. Its closed-loop normalized...
In this paper, we propose a new feedback decision-directed (FB-DD) phase error detector for quadratic phase-shift keying (QPSK) signal and a self-normalizing FB-DD detector for M-PSK signal. The self-normalizing detector can be used in the hybrid carrier recovery loop as discussed by Linn, while its open loop characteristic is independent of the imperfection of automatic gain control (AGC). Moreover,...
We study the multi-robot synchronization on a segment. The goal is for each robot to move along a subsegment of equal length in equal time interval with potential impacts. To achieve the synchronization, we propose a decentralized algorithm by designing impact law, which does not depend on the position of the robot, but on the time information. Specifically, ??the time interval between two consecutive...
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