Distributed Resource Allocation Assisted by Intercell Interference Mitigation in Downlink Multicell MC DS-CDMA Systems

Abstract

This paper investigates the allocation of resources including subcarriers and spreading codes, as well as intercell interference (ICI) mitigation for multicell downlink multicarrier direct-sequence code division multiple-access (MC DS-CDMA) systems, which aim to maximize the system's spectral efficiency (SE). The analytical benchmark scheme for resource allocation and ICI mitigation is derived by solving or closely solving a series of mixed integer non-convex optimization problems. Based on the optimization objectives same as the benchmark scheme, we propose a novel distributed resource allocation assisted by ICI mitigation scheme referred to as RAIM, which requires very low implementation complexity and demands little backhaul resource. Our RAIM algorithm is a fully distributed algorithm, which consists of the subcarrier allocation (SA) algorithm named RAIM-SA, spreading code allocation (CA) algorithm called RAIM-CA and the ICI mitigation algorithm termed RAIM-IM. The advantages of the RAIM include that, its CA only requires limited binary ICI information of intracell channels, and it is able to make mitigation decisions without any knowledge of ICI information. Our simulation results show that, the proposed RAIM scheme with very low complexity required achieves significantly better SE performance than other existing schemes, and its performance is very close to that obtained by the benchmark scheme.

Analysis and comparison of different cooperative cellular networks

“…The main issue which restricts achieving great system performance in cellular networks (CNs) is the cochannel interference (CCI) matter . Therefore, fractional frequency reuse (FFR) technique is addressed to resolve this problem.…”

Adequate spreading codes to reduce MAI in quasi‐synchronous MC‐DS‐CDMA system

“…With the increasing demand for high data rate communications and bandwidth efficiency, multicarrier (MC) modulation was introduced into DS-CDMA systems. MC-DS-CDMA can be a promising solution for supporting ubiquitous wireless communications in diverse environments, such as indoor, rural, and urban areas [6]. Furthermore, it has the potential to be adopted in 5G networks due to their improved spectrum efficiency and robustness against channel frequency selectivity [7].…”

“…Furthermore, it has the potential to be adopted in 5G networks due to their improved spectrum efficiency and robustness against channel frequency selectivity [7]. However, MC-DS-CDMA systems are interference limited; hence an improvement of system capacity is obtained by mitigation of interferences [6].…”

Analysis and Comparison of Different Cooperative Cellular Networks

“…Co-Channel Interference (CCI) problem restricts achieving high system performance in cellular networks [1]. Therefore, Fractional Frequency Reuse (FFR) technique is addressed to solve this problem.…”