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Small cells will play an important role in the fifth generation mobile networks. As recent works pointed out, a significant improvement in energy efficiency can be obtained if small base stations (SBSs) are provided with storage capabilities. In this paper, we study the problem of caching optimization in the presence of interference with and without cooperation between the SBSs. We consider a setup...
The increasing demand for high-rate broadcast and multicast services over satellite networks has pushed for the development of High Throughput Satellite (HTS) characterized by a large number of beams (e.g., more than 100). Moreover, the variable distribution of data traffic across beams and over time has called for the design of a new generation of satellite payloads, able to flexibly allocate bandwidth...
This paper studies the sum throughput maximization of the return-link in multi-beam satellite systems. Considering bursty communication scenarios with different users' data request probabilities, we develop an efficient scheduling scheme using genetic algorithms (GAs). Moreover, we consider co-channel interference (CCI) and adjacent channel interference (ACI). We consider a receiver with and without...
We study a queueing system operated with packet level coding. More specifically, we derive a closed form upper bound on the queueing delay as well as an expression for the decoding delay of a system operated with systematic network coding. Unlike previous works, the delay is considered on a per-packet basis rather than per-block, thus taking into account the low-latency property of systematic codes...
We present a novel random multiple access scheme that combines joint multiuser detection (MUD) with physicallayer network coding (PLNC) over extended Galois fields (EGF). We derive an analytical bound on the throughput at the system level and present simulation results for the decoding at the physical level in both fast fading and block fading channels. We adopt a cross layer approach in which a non-binary...
We present a novel decoding scheme for slotted ALOHA which is based on concepts from physical-layer network coding (PNC) and multi-user detection (MUD). In addition to recovering individual user packets from a packet collision as it is usually done with MUD, the receiver applies PNC to decode packet combinations that can be used to retrieve the original packets using information available from other...
In a streaming application video packets are required to be decoded and displayed in the order they are transmitted as the transmission continues. This results in perpacket delay constraints, and in the wireless setting the resulting channel can be modeled as a physically degraded fading broadcast channel with as many virtual users as the number of packets. Two important quality of user experience...
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