Satellite network capacity improvement method based on network coding

【 pick   want 】 The analysis and improvement of satellite network capacity has always been a matter of great concern , therefore , The capacity enhancement method of satellite network based on network coding is studied . First , The dynamic satellite network is abstracted by the method of time expansion graph , secondly , For network coding and non network coding , The corresponding mathematical problems are put forward respectively , Again , In the case of network coding , The capacity optimization problem is decomposed into multiple single source single destination maximum flow problems , For the case of non network coding , The coupling of constraints is difficult to solve , Therefore, we use dichotomy to get the optimal network capacity . Last , Simulation results show that network coding can significantly improve the capacity of Satellite Networks .

【 key word 】 Satellite networks ; Network coding ; Capacity improvement ; Dichotomy

0    introduction

Spatial dynamic network [1-3] It is developing with the increasing service demand of people , The growth of network users 、 Diversification of node types 、 A series of characteristics, such as the high quality requirements of data transmission and the limitation of network resources, make the spatial dynamic network expand in the network 、 Resource sharing 、 Integrated networking and network transmission capacity are facing greater challenges . therefore , Without increasing the number of satellite network nodes 、 Frequency band 、 Storage 、 Power and other resources , Exploring network transmission methods that can effectively improve network transmission capacity and quality of service is a hot issue in the field of satellite research at home and abroad , It is also the key to the development of Spatial Dynamic Networks .

There are also some researches on network capacity in satellite communication system , The literature [4] For multi beam satellites - An adaptive power control method is proposed for ground communication system , Reduce interference between systems by optimizing transmission power , It can increase the total capacity of the system . The literature [5] According to the location of the load concentration area , The power resources are allocated by combining the launch power of the satellite and the peak gain of the satellite point beam , Trade off between transmit power and beam directivity , Compared with the traditional allocation method, it can accommodate more traffic . The literature [6] In the multi beam satellite communication system, the traditional iterative water injection algorithm has the problems of high computation and complexity , An improved power allocation algorithm with low complexity is proposed , Sure