In this paper,potential use of perfect but delayed channel estimates for variable-power discrete-rate adaptive modulation is explored.Research is concentrated on block by block adaptation.At first,a new quantity-TAUD(...In this paper,potential use of perfect but delayed channel estimates for variable-power discrete-rate adaptive modulation is explored.Research is concentrated on block by block adaptation.At first,a new quantity-TAUD(Tolerable Average Use Delay)is defined,it quantifies the performance of an adaptation scheme in tolerating the delay of channel estimates.Then,the research on TAUD shows that the delay tolerating performance declines with the increase in average power,the scheme working with more modulation modes can tolerate a longer delay,and such improvement will be more significant with the increase of average power.Finally,it shows that,as the delay tolerating performance determines the maximum block length,it has a great effect on the maximum spectral efficiency.The criterion for determining the block length appropriate for the target BER is described and a simple method of calculating the maximum block length is presented.展开更多
为提高无线自组网的传输距离,提升其市场应用价值,引进5G通信技术,设计研究无线自组网自适应调制方法。首先,假定无线自组网下每一个节点都有一个唯一的身份标识号码(Identity Document,ID),根据节点的传输与通信能力,建立无线自组网节...为提高无线自组网的传输距离,提升其市场应用价值,引进5G通信技术,设计研究无线自组网自适应调制方法。首先,假定无线自组网下每一个节点都有一个唯一的身份标识号码(Identity Document,ID),根据节点的传输与通信能力,建立无线自组网节点信息传输函数,设定5G通信下无线自组网节点信息传输协议与格式;其次,引进Xilinx IP Core,进行节点的调制编码;最后,进行自由空间传输时,计算无线自组网单跳链路对于信号的接收功率,以此为依据,设计无线自组网传播信号信噪比计算与自适应调制。实验结果证明,使用设计的方法进行无线自组网自适应调制可以有效提高无线自组网的通信与信号传输范围。展开更多
基金supported by National Natural Science Foundation of China(No.61071087)Chun Lei 2009BWZ037 from SDUST,China
文摘In this paper,potential use of perfect but delayed channel estimates for variable-power discrete-rate adaptive modulation is explored.Research is concentrated on block by block adaptation.At first,a new quantity-TAUD(Tolerable Average Use Delay)is defined,it quantifies the performance of an adaptation scheme in tolerating the delay of channel estimates.Then,the research on TAUD shows that the delay tolerating performance declines with the increase in average power,the scheme working with more modulation modes can tolerate a longer delay,and such improvement will be more significant with the increase of average power.Finally,it shows that,as the delay tolerating performance determines the maximum block length,it has a great effect on the maximum spectral efficiency.The criterion for determining the block length appropriate for the target BER is described and a simple method of calculating the maximum block length is presented.
文摘为提高无线自组网的传输距离,提升其市场应用价值,引进5G通信技术,设计研究无线自组网自适应调制方法。首先,假定无线自组网下每一个节点都有一个唯一的身份标识号码(Identity Document,ID),根据节点的传输与通信能力,建立无线自组网节点信息传输函数,设定5G通信下无线自组网节点信息传输协议与格式;其次,引进Xilinx IP Core,进行节点的调制编码;最后,进行自由空间传输时,计算无线自组网单跳链路对于信号的接收功率,以此为依据,设计无线自组网传播信号信噪比计算与自适应调制。实验结果证明,使用设计的方法进行无线自组网自适应调制可以有效提高无线自组网的通信与信号传输范围。
