196 research outputs found
On the Performance and Optimization for MEC Networks Using Uplink NOMA
In this paper, we investigate a non-orthogonal multiple access (NOMA) based
mobile edge computing (MEC) network, in which two users may partially offload
their respective tasks to a single MEC server through uplink NOMA. We propose a
new offloading scheme that can operate in three different modes, namely the
partial computation offloading, the complete local computation, and the
complete offloading. We further derive a closed-form expression of the
successful computation probability for the proposed scheme. As part of the
proposed offloading scheme, we formulate a problem to maximize the successful
computation probability by jointly optimizing the time for offloading, the
power allocation of the two users and the offloading ratios which decide how
many tasks should be offloaded to the MEC server. We obtain the optimal
solutions in the closed forms. Simulation results show that our proposed scheme
can achieve the highest successful computation probability than the existing
schemes.Comment: This paper has been accepted by IEEE ICC Workshop 201
Heterogeneous Power-Splitting Based Two-Way DF Relaying with Non-Linear Energy Harvesting
Simultaneous wireless information and power transfer (SWIPT) has been
recognized as a promising approach to improving the performance of energy
constrained networks. In this paper, we investigate a SWIPT based three-step
two-way decode-and-forward (DF) relay network with a non-linear energy
harvester equipped at the relay. As most existing works require instantaneous
channel state information (CSI) while CSI is not fully utilized when designing
power splitting (PS) schemes, there exists an opportunity for enhancement by
exploiting CSI for PS design. To this end, we propose a novel heterogeneous PS
scheme, where the PS ratios are dynamically changed according to instantaneous
channel gains. In particular, we derive the closed-form expressions of the
optimal PS ratios to maximize the capacity of the investigated network and
analyze the outage probability with the optimal dynamic PS ratios based on the
non-linear energy harvesting (EH) model. The results provide valuable insights
into the effect of various system parameters, such as transmit power of the
source, source transmission rate, and source to relay distance on the
performance of the investigated network. The results show that our proposed PS
scheme outperforms the existing schemes.Comment: This article has been accepted by IEEE GLOBECOM201
Random Integer Lattice Generation via HNF
Lattices used in cryptography are integer lattices. Defining and generating a random integer lattice are interesting topics. A generation algorithm for random integer lattice can be used to serve as a random input of all the lattice algorithms. In this paper, we recall the definition of random integer lattice given by G.Hu et al. and present an improved generation algorithm for it via Hermite Normal Form. It can be proved that with probability >= 0.99, this algorithm outputs an n-dim random integer lattice within O(n^2) operations
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