摘要
考虑认知用户传输功率受限,两认知用户与授权用户之间相对位置在三维空间任意分布,受到地理信息、射频环境和环境背景等多维因素影响,研究了一种无线环境下的判别协同感知性能优劣的模型,并通过相应的数值仿真验证所提的优化方案。研究结果表明:协同感知性能受到路径损耗指数、衰减因子、用户间相对位置变化和用户传输功率等多维参数的相互制约,但是在满足一定条件时存在优化的可能,甚至有很大优化空间。
Taking into account the constrained cognitive user transmission power,the random distribution of relative positions between two cognitive users and the licensed user in the three-dimensional space,the context effects of geographical information,the RF environment and the environmental background,a model is proposed capable of evaluating the performance of collaborative spectrum sensing under the wireless environment.The feasibility of the model is well explained and supported by extensive simulations.The study results indicate that the collaborative spectrum sensing performance is affected by multiple factors including path loss exponent,fading factor,the relative position changes between users and user transmission power.Optimization can be achieved under certain conditions,maybe with great improvement in some cases.
出处
《南京邮电大学学报（自然科学版）》
2011年第4期19-23,28,共6页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家自然科学基金(60872003)
苏州市应用基础研究计划(SYJG0925)
博士学科点专项科研基金(20093201110005)资助项目
关键词
认知无线电
多维度优化
协同感知
概率增益
时间灵敏度
cognitive radio
multi-dimension optimization
collaborative sensing
probability gain
time agility
