Efficient energy utilization in covert communication sustains covertness while assuring communication quality and efficiency.This paper investigates covert communication energy efficiency(EE)in direct uplink satellite...Efficient energy utilization in covert communication sustains covertness while assuring communication quality and efficiency.This paper investigates covert communication energy efficiency(EE)in direct uplink satellite-ground communications,focusing on enhancing system EE via optimized transmit beamforming and satellite orbit altitude selection.This paper first establishes an optimization problem to maximize system EE in a direct uplink satelliteground covert communication scenario.To solve this non-convex optimization problem,it is decomposed into two subproblems and solved using the successive convex approximation(SCA)method.Based on the above methods,this paper proposes an overall iterative optimization algorithm.Simulation results demonstrate that the proposed algorithm surpasses the conventional baseline algorithms in terms of system EE.Furthermore,they elucidate the correlation between the amount of information received by the receiver and the variations in the satellite’s orbital altitude.展开更多
以覆盖类别为状态变量建立了窄带物联网(NB-IoT, narrow-band internet of things)覆盖类别更新机制的马尔可夫链模型,给出了平均接入失败概率和平均功耗的优化模型及求解办法,分析了前导码重复次数、系统负载、全局最大传输次数对各覆...以覆盖类别为状态变量建立了窄带物联网(NB-IoT, narrow-band internet of things)覆盖类别更新机制的马尔可夫链模型,给出了平均接入失败概率和平均功耗的优化模型及求解办法,分析了前导码重复次数、系统负载、全局最大传输次数对各覆盖类别最大传输次数最优取值的影响。数值分析表明:常规覆盖类别和扩展环境覆盖类别的最大传输次数对系统性能影响较大,最大传输次数取值范围应分别控制在[1,5]和[1,7]之间;极端环境覆盖类别的最大传输次数对系统性能影响不大,可取[1,10]之间的任意值,建议取值为1;所提的引入覆盖类别回退机制的覆盖类别更新机制的平均功耗比协议模型低约95%。展开更多
基金supported in part by the National Natural Science Foundation of China under Grants 62025110,62271093sponsored by Natural Science Foundation of Chongqing,China,under Grant CSTB2023NSCQ-LZX0108.
文摘Efficient energy utilization in covert communication sustains covertness while assuring communication quality and efficiency.This paper investigates covert communication energy efficiency(EE)in direct uplink satellite-ground communications,focusing on enhancing system EE via optimized transmit beamforming and satellite orbit altitude selection.This paper first establishes an optimization problem to maximize system EE in a direct uplink satelliteground covert communication scenario.To solve this non-convex optimization problem,it is decomposed into two subproblems and solved using the successive convex approximation(SCA)method.Based on the above methods,this paper proposes an overall iterative optimization algorithm.Simulation results demonstrate that the proposed algorithm surpasses the conventional baseline algorithms in terms of system EE.Furthermore,they elucidate the correlation between the amount of information received by the receiver and the variations in the satellite’s orbital altitude.
文摘以覆盖类别为状态变量建立了窄带物联网(NB-IoT, narrow-band internet of things)覆盖类别更新机制的马尔可夫链模型,给出了平均接入失败概率和平均功耗的优化模型及求解办法,分析了前导码重复次数、系统负载、全局最大传输次数对各覆盖类别最大传输次数最优取值的影响。数值分析表明:常规覆盖类别和扩展环境覆盖类别的最大传输次数对系统性能影响较大,最大传输次数取值范围应分别控制在[1,5]和[1,7]之间;极端环境覆盖类别的最大传输次数对系统性能影响不大,可取[1,10]之间的任意值,建议取值为1;所提的引入覆盖类别回退机制的覆盖类别更新机制的平均功耗比协议模型低约95%。
