جستجوی مقالات مرتبط با کلیدواژه « C-RAN » در نشریات گروه « برق »

In this paper, downlink user association, codebook assignment, and power allocation for a Sparse Code Multiple Access (SCMA)-based communication in Cloud Radio Access Network (C-RAN) are interrogated. The main aim of this paper is to accomplish a three-step resource allocation algorithm to achieve the maximum total sum rate subject to SCMA, user association, minimum user power, total available power in Radio Remote Head (RRH), and fronthual constraints with low complexity. To solve the recommended problem an iterative algorithm considering Successive Convex Approximation is utilized. The main problem is separated into three subproblems of user association, codebook assignment, and power allocation. The user association and codebook assignment subproblems are Integer Linear Programming and solved with CVX toolbox. Furthermore, to solve the power allocation subproblem, Successive Convex Approximation with Low Complexity is applied. In the simulation results, the effectiveness of the recommended resource allocation method is shown and compared to OFDMA.

This paper considers the power-efficient resource allocation problem in a cloud radio access network (C-RAN). The C-RAN architecture consists of a set of base-band units (BBUs) which are connected to a set of radio remote heads (RRHs) equipped with massive multiple input multiple output (MIMO), via fronthaul links with limited capacity. We formulate the power-efficient optimization problem in C-RANs as a joint resource allocation problem in order to jointly allocate the RRH and transmit power to each user, and fronthaul link and BBU assign to active RRHs while satisfying the minimum required rate of each user. To solve this non-convex optimization problem we suggest iterative algorithm with two-step based on the complementary geometric programming (CGP) and the successive convex approximation (SCA). The simulation results indicate that our proposed scheme can significantly reduce the total transmission power by switching off the under-utilized RRHs.

To address the continuously increasing demand for high data rates, beside air interface technologies, there are requirements to introduce new and effective ways to design architecture of networks. This paper proposes several technologies which can be used as promising candidates to change the future of wireless communication architecture especially in Fifth generation (5G) wireless network. In this article, we discuss various promising cellular architectures such as full duplex communication, device-to-device communication, mobile femtocell, visible light communication and visualization in 5G.