Research On Resource Allocation Mechanism Based On Energy Efficiency In Sparse Code Multiple Access System

In recent years,a new round of scientific and technological revolution is accelerating the global evolution.The traditional Orthogonal Frequency Division Multiple(OFDM)technology can no longer meet the requirements of massive connections,high-speed,and low-latency connections in future networks.For this reason,a new multiple access multiplexing method of non-orthogonal multiple access has been proposed in the industry.Sparse Code Multiple Access(SCMA)technology is one of a variety of non-orthogonal multiple access technologies.It can not only effectively improve the spectrum utilization and system throughput,but also can flexibly adjust the resource block size.Adapting to a variety of business needs is a multi-site technology with great development potential.With the explosive growth of user access in the future,energy loss is an unavoidable problem.Advocating green communication in the future,how to improve the energy efficiency of future communication networks is a matter of great research significance.In this paper,starting from the study of SCMA energy efficiency optimization,the rational allocation of subcarriers,codebooks and power in the SCMA system is studied.The main research contents and the results obtained are as follows:1.Research on energy efficiency optimization of single-cell multi-user uplink cellular mobile communication system based on sparse code multiple access technology.On the premise of guaranteeing the user's Qo S(Quality of Service)requirements,with the goal of maximizing the system's uplink energy efficiency,a resource allocation mechanism is proposed,which mainly includes codebook and power allocation.In order to reduce the load of the base station and reduce the signaling overhead in the network,a distributed and weakly centralized allocation mechanism,that is,a method based on microeconomics,is adopted.First,in the case of fixed power allocation,maximizing energy efficiency is equivalent to maximizing throughput,and the auction mechanism of maximizing throughput criterion is used to allocate codebooks;then,in the case of fixed codebook allocation,users use non-cooperative Game to obtain their own maximum energy efficiency.Simulation shows that the proposed resource allocation mechanism can effectively improve system energy efficiency and reduce system power consumption compared with other schemes.2.Incorporating the relay technology into the SCMA system and combining it with it,under the protection of the minimum rate requirements of each user,a seed carrier sequence pairing and codebook and power joint allocation algorithm are proposed to optimize the energy efficiency of the system.Since the objective function is a mixed integer optimization problem,it is divided into two independent sub-problems.First,preset the codebook and power allocation,and pair the sub-carriers based on energy efficiency;then,in the case of fixed sub-carrier pairing,use the optimal channel selection allocation method based on the energy efficiency codebook to transform the power problem into parameterized Concave function,construct Lagrangian function for iterative solution,and finally iteratively optimize codebook allocation and power allocation alternately until the objective function converges.The simulation shows that the energy efficiency of the system obtained by the proposed algorithm is better than other schemes.