POWER ALLOCATION ON 5G HETROGENEOUS NETWORK

Abstract

Wireless communications providing very high system throughput, extremely increase system capacity, number of mobile terminal has exponexially increase in 5G wireless network. how to effectively improve the users throughput challenging concept without considering additional bandwidth ,variety technology including new multiplexing technique and heterogeneous network implement on 5G mobile generation. Non orthogonal multiple access is one of promising multiplexing technique on 5G heterogeneous scenario, in a heterogeneous cellular network (HetNet), consider that a base station in the HetNet is able to simultaneously schedule and serve K users in the downlink by performing the power allocation on non-orthogonal multiple access scheme on intra subcarrier. This research primarily focus on power-domain non-orthogonal multiple access that utilizes superposition coding (SC) at the transmitter and successive interference cancellation (SIC) at the receiver on HetNet downlink coverage, multiple users and the proposed different power allocation scheme. First, achievable rate and link throughput of N users in each subcarriers and number of available subcarrier to build a single cell and multi-cell create HetNet, show that the effect of different power allocation on single frequency band on multi users N and link throughput can be largely reduced, if transmit power allocations among the K users do not satisfy the edge users achievable rate. Next, evaluate different power allocation scheme fixed power allocation scheme, fractional transmit power allocation scheme and full search power allocation scheme, to find suboptimal power allocation scheme and low computational power allocation scheme. Finally numerical simulations are conducted to validate the performance proposed optimal downlink power allocation scheme that maximize the average throughput individual to achieve better achievable rate on different users on placed on variety of channel gain users on single subcarriers performance metric transmit power and achievable rate. Results show that the total throughput of the system has been significantly improved