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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,...
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...
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...
A modified M&M frequency estimation algorithm for DVB-S2 system is proposed in this paper. This estimator provides a larger estimation range compared to the well known Fitz and L&R methods and achieves CRB in the whole SNR operation range of DVB-S2, with a little increase in computational complexity. The enlarged estimation range will reduce the acquisition time of the coarse frequency synchronizer...
In this paper we introduce a kind of wireless TDMA network. Active synchronization mode and passive synchronization mode are supported in this TDMA network. In the network the system time is provided by time reference (TR) which is a special node. TR transmits a special message called initial entry at the first slot of each frame. The other node which receives the initial entry will adopt different...
TDMA structure has been implemented in many communication systems to allow multiple users to access. Proper system operation requires all users to have precise knowledge of system time. With pseudo noise (PN) spreading techniques, there are accurate time of arrival (TOA) measurements between the transmitting terminals. The Global Positioning System (GPS) is a satellite navigation system capable of...
In this paper we analyze the joint performance of time synchronization and relative navigation of a kind of wireless TDMA network. The network is based on spread spectrum communication system and can support relative navigation service by continuously receiving and parsing the navigation information in position information (PI) messages. By the calculation of the relative position of other users according...
Round Trip Timing (RTT) and PPLI message are two ways of time synchronization in the Joint Tactical Information Distribution System (JTIDS) network. The former is a kind of active time synchronization, which could make the user have high timing level directly. The latter is completely passive and could provide low level time synchronization as a byproduct of navigation. This paper begins with the...
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