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Direct device-to-device (D2D) communication is considered as a key technology and enabler for a multitude of new services in future fifth generation (5G) networks. Especially safety and emergency applications will require fast and reliable handover, seamless D2D connectivity and proper radio access to the cellular network. This paper proposes a novel handover scheme, which takes advantage of the D2D...
Direct device-to-device (D2D) communication is considered to be part of fifth generation (5G) networks, while embodying vehicle-to- anything (V2X) communication into the recently defined Long Term Evolution (LTE) sidelink is already on the way. Coexistence of in-band D2D and cellular transmissions requires time synchronization between multiple links to prevent from interference and avoid using longer...
Time synchronization is of great significance in underwater acoustic (UWA) networks. Many functions, such as network protocol stack, sleep-scheduling, and localization, are based on time synchronization. Because underwater sound speed is comparatively slow, synchronization protocols encounter a long propagation latency problem, which differs from those in terrestrial sensor networks. As a result,...
Quick detection and accurate measurement of multiple cells surrounding the user equipment (UE) are essential to ensure the mobility and QoS of end users. In LTE and LTE-A, multiple cells are often time synchronized or quasi-synchronized so that weak cells “eclipsed” by strong interfering cells are difficult to detect. In this study, we present a novel neighbor cell search and measurement method in...
In order to provide the passive and active array with replica vector for achieving transmitting and receiving focusing on proud and burried targets, the time reversal mirror-virtual source array-refracted spherical wave beamforming (TRM-VSA-RSBF) method is proposed. The original idea is from the work of S.C. Walker et.al. We develop their work in two aspects. First, we generalizes the method to the...
We address the issues related to implementation of baseband signal processing algorithms on an SDR platform with multiple parallel processors, such as the Intel's X-GOLD™ SDR20 baseband processor. The basic idea is to reformulate the baseband signal processing algorithms such that they can be efficiently implemented on a parallel architecture. A hierarchical LTE initial synchronization scheme is taken...
This paper addresses problems related to time and frequency synchronization as well as blind CP (cyclic prefix) type identification in 3GPP LTE system. We start with a general framework based on maximum likelihood (ML) parameter estimation. Then, simplified practical algorithms for estimating time and frequency offset as well as blind CP length are described. Finally, a robust hierarchical scheme...
In this paper we investigate the time and frequency synchronization as well as the sector and cell search for the 3GPP long term evolution (LTE) downlink. The proposed algorithms rely on the synchronization and cell-specific reference signals and are hence compliant to most recent 3GPP specifications. Time and (fractional) frequency offset coarse synchronization are performed in the time domain with...
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