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Next generation long term evolution (LTE) systems evolve towards small cell networks to boost spectrum efficiency through extreme frequency reuse. To mitigate the impact of the resulting tremendous co-channel interference, advanced receivers supporting network assisted interference cancellation and suppression (NAICS) represent a promised technique to meet the ubiquitous cell edge free experience...
Small cells are low power nodes, which have lower transmit power than the macro eNodeB. They are regarded as one of the important solutions in long term evolution advanced (LTE-A) to deal with the dramatically increased mobile data traffic. Small cells deployments in LTE-A release 12 with 4 small cells in a cluster suffer from stronger inter-cell interference than heterogeneous network (HetNet) in...
Wireless power transfer (WPT) is widely used in portable devices with the advantage of flexibility and convenience. This paper proposes a cooperative multiple coil matrix transmitter (CMCM) structure. This design allows the mobile device receiver coil to be freely placed above the wireless charging pad which can select the appropriate transmitter coils to activate according to the location of the...
Coordinated multipoint (CoMP) transmission is a key technique in 4G long term evolution (LTE) systems to provide the ubiquitous broadband communication with cell edge free experience at the user equipment (UE). However, as the transmit signals will reach the UE at several and varying delays, practical CoMP networks might experience large timing offsets (TOs), imposing a significant performance loss...
Small cell transmission is a promised technique to enable the tremendous data growth in next generation long term evolution (LTE) networks. However, emerging inter-cell interference is the dominant limiting factor achieving higher network capacities. In this paper we focus on cooperative interference mitigation techniques in interfering heterogeneous network (HetNet) deployments to assist the cell...
Wireless power transfer (WPT) is widely used in portable devices with the advantage of flexibility and conveniences. This paper aims to design a cube transmitter structure, which generates a spatially focused magnetic field providing effective power transfer. The phase shift in multiple coils has been optimized for maximum power transfer efficiency and free positioning in the charging spatial domain...
The fundamental frequency (F0) is an ubiquitous and crucial feature of music signals. However, due to nonstationary noise, missing harmonics, nonideal, i.e., Undesired, physical vibration of the musical instruments, etc., the estimation of F0 represents a considerable challenge when desiring to obtain robust and reliable results. In this paper, a novel harmonic pattern match (HPM) algorithm for F0...
Next generation long term evolution (LTE) systems evolve towards small cell networks (SCNs) to enable the tremendous data growth through extreme frequency reuse. However, shrinking the cell size to boost the spectral efficiency comes at the expense of increased co-channel interference (CCI) and is the dominant limiting factor from achieving higher network capacities. Consequently, downlink (DL) scenarios...
Next generation long term evolution (LTE) systems evolve towards small cell transmission to enable the tremendous data growth. However, emerging interference is the dominant limiting factor achieving higher network capacities. In this paper we focus on cooperative implicit feedback generation in interfering heterogeneous networks (HetNets) to assist the cell edge user equipment (UE) suffering from...
Inductive Power Transfer (IPT) techniques are gaining more and more interest in wireless power systems. The knowledge of the coupling factor of transmitter (TX) and receiver (RX) coil is a crucial, but mostly during operation not available parameter for such systems. In this manuscript a novel method to determine the coupling factor by measuring the self-resonating frequency of the postringing signal...
Spectrum sensing is one of key technologies in cognitive radio to obtain radio environment knowledge. However, the regular correlator detector suffers from the inference of multipath fading channel on the primary signal. In this paper we propose a theoretically simple, yet effective and implementation-friendly spectrum sensing scheme called multi-peak values (MPV) detector. Based on the criterion...
Wireless power transfer (WPT) system is to provide power transmission via near field magnetic resonant coupling between the transmitter and the receiver with the same frequency. In WPT system the most important parameter is efficiency. This paper proposes different cooperative transmitter matrixes with multiple coils. This design enables receiver coil to be freely placed and charged above the wireless...
Coordinated multipoint (CoMP) transmission is a promised candidate in long term evolution advanced (LTEA) systems to assure coverage and broadband communication for cell edge user equipments (UEs). However, the presence of timing offsets (TOs) between the received signals from multiple transmitters might limit the performance of CoMP transmission. The promised advantages of closed-loop CoMP transmission...
Coordinated multipoint (CoMP) transmission is a key technique in 4G long term evolution (LTE) systems to enable broadband communication and coverage for user equipments (UEs) at the cell edge. However, as the transmit signals will reach the UE at several and varying delays, unsynchronized CoMP transmission might experience large timing offsets (TOs), imposing a significant performance loss. In this...
Coordinated multipoint (CoMP) transmission is one of key technologies to provide broadband communication and coverage for cell edge user equipments (UEs) in long term evolution (LTE) systems. The basic concept behind CoMP transmission are geographically distributed transmitters working jointly in coordinated manner. As the transmit signals reach the UE at different times, CoMP networks might experience...
Coordinated Multipoint (CoMP) transmission is a promising technology in 4G Long Term Evolution (LTE) systems to enable coverage and high data rates for cell edge User Equipments (UEs). However, the presence of Timing Offset (TO) between the received signals from multiple transmitters at the UE could prove prohibitive for CoMP transmission. Such TO affects the estimation of the transmit covariance...
In order to develop a high power transmission efficiency for an Inductive Power Transfer (IPT) system especially the parameters of the receiver (RX) coil have to be analyzed in detail. This becomes essential, when the RX coil is part of a medical implant and dramatically limited in size. The parameters, which completely describe a coil, are its inductance and ohmic losses. Both values are just dependent...
Wireless ad hoc networks have been of significant interest in the communications engineering field within the last decades. Due to their flexibility and relatively low infrastructure and front end expenses, wireless ad hoc networks promise a wide application spectrum. To understand their expected performance, interference limited scenarios must be considered and an interference analysis based on the...
The concept of heterogeneous networks (HetNets) has been introduced in LTE-Advanced systems in order to improve overall capacity and cell-edge user performance. However, such uncoordinated deployments sharing the same spectrum present new interference issues that are difficult to combat with conventional interference management schemes. In this paper interference issues in a macro-femto scenario in...
The contactless charging system has a wide application range and many advantages for portable consumer electronic products. Wireless power transfer (WPT) includes both the transmitter and the receiver which are in the state of resonance to achieve high efficiency. This paper presents a new multiple overlapping coil transmitter structure which enables the receiver has high efficiency within transmitter...
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