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Oversampling combined with low quantization resolutions has been shown to be a viable option when aiming for energy efficiency in multigigabit/s communications systems. This work considers the case of 1-bit quantization combined with oversampling and shows how the performance of such a system can be improved by using matched pulse shaping filters and faster than Nyquist signaling. The channel is considered...
Small cell is an attractive and promising technology for improving capacity in traffic hotspots using cell densification. We consider the traffic load balancing problem for small cells under the enhanced Local Area (eLA) architecture utilizing the flexible 3-dimensional (3D) beamforming facilitated by the adoption of the active antenna system (AAS) at base stations (BSs). Different load balancing...
In heterogeneous networks (HetNets), due to transmit power disparity between macro and pico base stations (BSs), the conventional strongest downlink (DL) reference signal received power (RSRP) based user association results in high uplink (UL) interference. Such interference degrades the UL performance especially in terms of energy efficiency. In this paper, we propose Joint Uplink and Downlink User...
The multiple-input multiple-output relay broadcast channel with one source, one relay, and two destinations is studied. It is assumed that the source and the relay cooperatively serve one of two destinations, which may have a weaker channel from the source (due to, for example, being located far from the source), while the source alone serves the other destination that has a stronger channel. Given...
System level analytical models and simulations usually use analytical propagation models for estimating received signal power. These propagation models are typically based on statistical properties. Consequently, they are very well suited for general assessment of communication technologies and protocols. However, their universality lets them produce unrealistic results in situations where the concrete...
Due to the tremendous growth of mobile data traffic, some technologies from small cell deployment are still ongoing as nominated solutions. Without enlarged wired backhaul capacity, however, the performance of small cell techniques are inevitably degraded. The approach employing the storage capacity in order to off-load the backhaul capacity, as known as femto-caching, has been proposed to minimize...
This paper presents the design and implementation of high frequency resonant converter based on the Class F/sub 2/ inverter for inductive power transfer. MHz frequency operation can allow for higher power density than conventional switching frequencies. The converter is based on the Class F/sub 2/ inverter, reducing the voltage stress across the switch compared to other resonant topologies. A prototype...
In contrast to synthetic user mobility models, user movements in real-world scenarios are restricted and typically conform to location-specific street layouts. Further in urban areas, user movements depend on traffic laws and behavior of other users. For example, vehicular users are said to stop at red traffic lights or should brake, if a vehicle ahead suddenly stops. Moreover, cellular users moving...
Ultra-dense small cells are foreseen to play an essential role in the 5th generation (5G) of mobile radio access technology, which will be operating over different bands with respect to established systems. The natural step for exploring new spectrum is to look into the centimeter-wave bands as well as exploring millimeter-wave bands. This paper presents our vision on the technology components for...
This paper investigates a scheme for deriving feedback information for the interference rejection combining (IRC) receiver, which can suppress inter- cell interference, in order to perform adaptive modulation and coding (AMC), user scheduling, and transmission precoding at the serving eNodeB appropriately in the LTE/LTE-Advanced downlink. In this paper, we evaluate the negative impact of inappropriate...
In the presence of co-channel interference in cellular networks, interference mitigation by detecting the desired signal jointly with the interference promises considerable gain over the conventional way of handling the interference as colored Gaussian. Even though such interference-aware detection can improve the performance, it requires some information on the interference. In particular, the modulation...
This paper proposes an iterative decoding algorithm for network coding HARQ (NC-HARQ) retransmission scheme in LDPC system. Including two erroneous codewords and one retransmitted network coded word, a larger Tanner graph is applied in the decoding algorithm. We modify the process of iterative decoding and separate the external information into two parts which come from channel coding and network...
Due to high system capacity requirement, 3GPP Long Term Evolution (LTE) is likely to adopt frequency reuse factor 1 at the cost of suffering severe inter-cell interference (ICI). One of combating ICI strategies is network cooperation of resource allocation (RA). For LTE uplink RA, requiring all the subcarriers to be allocated adjacently complicates the RA problem greatly. This paper investigates the...
In this paper, we propose a filter-and-forward (FF)beamforming strategy in the secondary relays for the one-way cognitive relay network with frequency selective fading channels. Our aim is to optimize the beamforming coefficients and the secondary transmitted power to maximize the SINR at the secondary destination, while satisfying the interference constraint on the primary network and the total relays'...
The performance of multi-user multiple-input multiple-output (MU-MIMO) systems is not only affected by multi-path fading, but also by shadowing and path-loss. In this paper, we concentrate on the sum rate distribution of MU-MIMO systems employing linear zero-forcing receivers, accounting for both multi-path fading and shadowing effects, as well as spatial correlation at the transmit and receiver sides...
This paper investigates the energy efficiency of base station sleep scheduling strategies in 1-D infrastructure-based wireless communication networks formed by vehicles traveling on a highway. In certain scenarios, vehicular speeds and locations can be measured with a high degree of accuracy, and this information can be exploited to reduce the energy consumption of base stations. This paper considers...
This paper investigates inter-cell interference mitigation of non-orthogonal multiple access (NOMA) in the cellular downlink. A novel adaptive power and frequency resource allocation algorithm in the NOMA system is proposed for performance enhancement. The objective of the algorithm is to improve both the average cell throughput and cell-edge throughput through adaptive resource allocation in the...
The operation of wireless cellular networks can be efficiently supported by secondary small cells that are deployed on-demand in traffic hotspots within the coverage area of primary network cells. In view of the growing traffic demand and the limited spectrum available, the objective of this study is to examine the conditions under which the secondary base stations can share the same communication...
Mobile relay stations (MRSs) which are mounted in a high-speed train (HST) is popular system architecture for high-speed mobile communications. However, sharing spectrums between the macro cell and the MRS cell, interference exists in this hybrid system. In this paper, we investigate the downlink of a multi-cellular decode and forward (DF) relayed orthogonal frequency division multiple access (OFDMA)...
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