Spectral efficiency analysis of subcarrier and link incorporation for optimizing the resource allocation in 4G LTE cellular systems

Abstract

Neighbouring cells deteriorates the performance of Orthogonal Frequency Division Multiplexing Access (OFDMA) cellular networks particularly for edge users due to Inter Cell Interference (ICI). In this paper, subcarrier integration with suitable links is proposed for minimizing ICI after Self Organized Resource Allocation (SORA) and Link Grouping Algorithm (LGA) is used to selects the satisfactory links between the terminals i.e. eNodes (eNB) and User Equipments (UEs). In this paper, Subcarrier Grouping Algorithm (SGA) is used to choose the best available resources to the selected links and Particle Swarm Optimization (PSO) is used to find the best incorporation of Subcarriers — Link from the results of grouping algorithm. The combination of SGA and LGA without consideration of any optimization techniques is referred as Subcarrier-Link Grouping Resource allocation (SLGRA) algorithm. Proposed algorithm is compared with existing methods such as Low Interference Subcarrier Allocation (LISA) and Greedy Subcarrier Allocation (GSA). SLGRA with optimization technique is referred as Subcarrier Link Integration Optimized Resource Allocation (SLIORA). Improvement of proposed method is calculated in terms of percentage for scenarios with different user densities.