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This paper concerns time synchronization of MIMO systems. The current most powerful receiver is a generalized likelihood ratio test (GLRT) receiver, and assumes unknown, stationary, circular, and spatially colored Gaussian noise. However, this receiver is more complex than its non-GLRT counterparts, which, unfortunately, do not perform as well in most cases. As the complexity is an important issue...
In this paper, we describe time synchronization for D2D communication in heterogeneous networks. The transmission time and the detection time for D2D communication are considered in the case that each node basically has the uplink transmission time which is used for time synchronization with the base station. The analysis shows that the suitable transmission and detection times are generally the frame...
Physical-layer network coding (PNC) is a natural extension of network coding in wireless communication networks. PNC utilizes the addition characteristic of the electromagnetic wave rationally and improves the throughout in wireless networks significantly. This paper focuses on a key issue in PNC: the effect of pulse shaping on the performance of time synchronization errors. Analysis and simulation...
In this paper, we propose a gradual time synchronization scheme for wireless mesh networks (WMNs) based on orthogonal frequency division multiple access (OFDMA). For distributed time synchronization in WMNs, each node controls its transmission time and fast Fourier transform (FFT) starting time within the possible range according to the requests of neighbor nodes. The possible range is determined...
This letter analyzes the impact of imperfect timing synchronization of cellular base stations on feasibility of almost blank subframes, an interference management concept for heterogeneous networks. We claim that the most significant impact of timing synchronization mismatch lays in potential disturbance of a control channel that is located in the beginning of the subframe. We use stochastic geometry...
The practical applications of wireless sensor networks require robust time synchronization. In this paper we describe the Flooding Time Synchronization Protocol (FTSP) that provides time synchronization service in such networks. We found there are Key nodes and Non-key nodes when using FTSP in the case of temperature interference. This protocol was designed to utilize low communication bandwidth,...
This paper presents Glossy, a novel flooding architecture for wireless sensor networks. Glossy exploits constructive interference of IEEE 802.15.4 symbols for fast network flooding and implicit time synchronization. We derive a timing requirement to make concurrent transmissions of the same packet interfere constructively, allowing a receiver to decode the packet even in the absence of capture effects...
In this paper we study energy detection for primary user signals in the case of distributed Cognitive Radio (CR) networks. We concentrate on the effects of interference caused by other CR users due to timing misalignments and propose a novel mathematical model for calculating the effects of interfering nodes on energy detection and derive closed-form solutions for the probabilities of detection and...
This paper presents part of the experimental results obtained during the French national research project GRACE, which deals with opportunistic cognitive radio and spectrum management. The consortium, composed by French big- and small-size companies and research institutes, proposes a cognitive orthogonal frequency division multiplexing (OFDM) signal based on IEEE 802.16e standard, with time-windowing...
Time synchronization is a major challenge and a rich area of study in chirp ultra-wideband (UWB) communication systems. Since the pulse compressed by the matched filter is very short, the performance of chirp receivers is closely relative to precise timing acquisition. However, the existent method is very sensitive to noise. In this paper, we propose an improved synchronization method that allows...
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