With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in ...With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in the system,the scenario includes multiple source stations,multiple relay stations,multiple destination stations,and eavesdroppers.To analyze the optimal relay selection in the system,we begin with the performance analysis for a single source station and a single destination station.By applying two cooperative models,the amplify-andforward（AF） mode and decode-and-forward（DF）mode,the secrecy capacity is derived.Then,we apply the derived results to the considered environment to find the optimal relay assignment.By the way,the relay selection can be obtained by the exhaustive search algorithm.However,there are a lot of steps needed if the number of source stations is large.Hence,applying the characters of the cooperative modes in the relay selection,the pre-selection step is proposed with a mathematical derivation.It could be used for the practical situation without a long-time calculation.展开更多
In 2020,the issue of absolute poverty has been solved,and China is building a well-off society in an all-round way.The issue of relative poverty is an important content of poverty reduction.Based on a survey data from...In 2020,the issue of absolute poverty has been solved,and China is building a well-off society in an all-round way.The issue of relative poverty is an important content of poverty reduction.Based on a survey data from Danba County in October 2020,this paper uses the AF method to calculate the incidence of multidimensional poverty and the multidimensional poverty index.The results showed that 44.65%of the farmers have multidimensional deprivation of any three indicators of relative poverty,and 2.79%of the farmers have serious multidimensional deprivation;the incidence of one-dimensional poverty in terms of“educational level index of head of household,”“per capita non-transfer income of households in 2019,”and“per capita household income in 2019”is the highest;at the same time,the contribution rate of the three indicators to the multidimensional poverty index is also higher than other indicators.Therefore,several suggestions have been put forward to alleviate the multidimensional relative poverty in the region from the aspects of industry development and education.展开更多
文摘With the low cost and low hardware complex considerations,cooperative systems are a tendency in the future communications.This work considers the secure cooperative communications systems.For a practical situation in the system,the scenario includes multiple source stations,multiple relay stations,multiple destination stations,and eavesdroppers.To analyze the optimal relay selection in the system,we begin with the performance analysis for a single source station and a single destination station.By applying two cooperative models,the amplify-andforward（AF） mode and decode-and-forward（DF）mode,the secrecy capacity is derived.Then,we apply the derived results to the considered environment to find the optimal relay assignment.By the way,the relay selection can be obtained by the exhaustive search algorithm.However,there are a lot of steps needed if the number of source stations is large.Hence,applying the characters of the cooperative modes in the relay selection,the pre-selection step is proposed with a mathematical derivation.It could be used for the practical situation without a long-time calculation.
文摘In 2020,the issue of absolute poverty has been solved,and China is building a well-off society in an all-round way.The issue of relative poverty is an important content of poverty reduction.Based on a survey data from Danba County in October 2020,this paper uses the AF method to calculate the incidence of multidimensional poverty and the multidimensional poverty index.The results showed that 44.65%of the farmers have multidimensional deprivation of any three indicators of relative poverty,and 2.79%of the farmers have serious multidimensional deprivation;the incidence of one-dimensional poverty in terms of“educational level index of head of household,”“per capita non-transfer income of households in 2019,”and“per capita household income in 2019”is the highest;at the same time,the contribution rate of the three indicators to the multidimensional poverty index is also higher than other indicators.Therefore,several suggestions have been put forward to alleviate the multidimensional relative poverty in the region from the aspects of industry development and education.
