Cooperative water filling (CoopWF) algorithm for small cell networks

Abstract

This paper proposes a new power allocation algorithm with precoding in cooperative small cell networks (SCNs). A power allocation algorithm based on cooperative water-filling (CoopWF) is proposed and block diagonalization (BD) precoding is adopted to cancel the inter-user interferences. The proposed scheme is easily implementable to SCNs such as femto-cell, metrocell, and pico-cell. Simulation results show that the proposed CoopWF algorithm provides better mean capacity compared to the existing power allocation algorithm.

A Study on the Fire Detection and Smoke Removal in Underground Utility Tunnel Using CFD

“…This was selected only for the scale and cases that could occur in the underground utility tunnel. It was also assumed that the smoke spread of a fire is similar to the high-temperature spread trend [55][56][57]. The location of the fire source was analyzed, as shown in Figure 6.…”

“…In addition, a study on the heat distribution characteristics related to fire in an underground facility, which is an environment similar to an underground utility tunnel, was conducted. Several underground facilities were targeted as follows: cabin [18], subway [19], tunnel [20][21][22][23][24], platforms [25], mines [26], railways [27], parking lots [28]. These studies aimed to analyze fire risk and design response scenarios by predicting heat flow, temperature distribution, and gas diffusion when a fire breaks out.…”

Interference Management using Power Control for Device-to-Device Communication in Future Cellular Network

“…In this system, P T M .G T M means the received signal power at the distance d. Since this paper does not consider the ef-fect of small scale fading, G T M could be denoted as a propagation model. This paper adopts the propagation model formulated in [9] and [15]. This formula describes the path-loss link between pieces of user equipment, which calculates the propagation loss from D2D UE/D2DT of D2DR and MUE to the macro cell or vice versa:…”

“…One of the solutions adopted to manage interference-related problems is to separate the frequency allocation for D2D communications and macro cell communications, as presented in [7], [8]. However, limitation of the frequency spectrum is a common and serious problem, because of numerous devices staying on within a macro cell cellular network [9]. One of the solutions is to use a different frequency for each device, but this scheme is less effective, because in areas in which D2D communication is not used frequently, frequency domain allocated to D2D communications will be wasted.…”