搜索结果: 1-15 共查到“知识库 CDMA”相关记录306条 . 查询时间(0.109 秒)
Analysis of Belief Propagation for Non-Linear Problems: The Example of CDMA (or: How to Prove Tanaka’s Formula)
Binary signal and white gaussian noise spread sequence scheme of linear time
2015/8/21
We consider the CDMA (code-division multipleaccess) multi-user detection problem for binary signals and additive white gaussian noise. We propose a spreading sequences scheme based on random sparse si...
Simutaneous rate and power control in multirate CDMA systems
Wireless multimedia terminal transmission data rate and transmission rate optimize the data transfer rate
2015/8/11
We consider a wireless multimedia CDMA system, where the different mobiles transmit at different rates. We devise a method of simultaneously optimizing the power and rate at which the different termin...
Simultaneous routing and resource allocation in CDMA wireless data networks
Routing wireless networks data network transmission and network performance
2015/8/11
The optimal routing of data in a wireless network depends on the link capacities, which, in turn, are determined by the allocation of transmit powers across the network. Thus, the optimal network perf...
Simultaneous Rate and Power Control in Multirate Multimedia CDMA Systems
Simultaneous Rate Power Control Multirate Multimedia CDMA Systems
2015/7/10
We consider a wireless multimedia CDMA system, where the different mobiles transmit at different rates. We devise a method of simultaneously optimizing the power and rate at which the different termin...
Simultaneous Routing and Resource Allocation in CDMA Wireless Data Networks
Simultaneous Routing Resource Allocation CDMA Wireless Data Networks
2015/7/10
The optimal routing of data in a wireless network depends on the link capacities, which, in turn, are determined by the allocation of transmit powers across the network. Thus, the optimal network perf...
Optimal Link Adaptation in Wideband CDMA Systems
Optimal Link Adaptation Wideband CDMA Systems
2015/7/8
We develop a general framework for optimizing link adaptation for multiuser CDMA systems in the wideband limit. The framework is then used to solve for the optimal power control policy that minimizes ...
Optimal Power Control for CDMA Systems in the Wideband Limit
Optimal Power Control CDMA Systems Wideband Limit
2015/7/8
Traditional methods for solving multiuser control problems in CDMA systems do not scale well as the number of users in the system increases. To address this problem we develop a wideband limit approxi...
针对具有空时分组码的多载波CDMA(Space Time Block Coding Multi Carrier Code Division Multiple Access,STBC-MC-CDMA)信号扩频码及信息序列的联合估计问题,结合序贯蒙特卡罗(Sequential Monte Carlo,SMC)算法和卡尔曼滤波技术,充分利用STBC和OFDM(Orthogonal Frequency D...
基于CDMA的油井信息监控技术研究
CDMA监控技术 单边带信号 动态分配
2017/1/6
油田企业多采用CDMA信息监控技术对传输信号进行单边带信号的调整。这种信息监控技术能够保证传输数据在幅值上进行反比的转化,同时在波形周期上满足传输信道之间的时间间隙。并且CDMA监控技术利用了动态带宽分配技术,在信道空闲状态下,完成其他各传输信道内数据的传递,使接收设备在有效时间内完成信息的对接。对CDMA油井信息监控技术的分析,对其抽样、量化、编码原理及功能全面解析,可得知单边带信号的调制能够对...
DS-CDMA是在扩频技术上发展起来的多址接入方式,但在用户接入数量过载时难以保证高质量的通信性能。基于此,提出了一种基于稀疏图的DS CDMA系统。该系统以低密度二分图的形式来描述扩频码片和用户之间的关系,使得参与通信的每个用户只在少量码片上进行非零位扩频调制,最大限度地减少了用户间的相互干扰。借助图模型的相关理论,把适合于稀疏图的置信度传播算法应用于该系统,进行多用户检测,通过码片与用户之间的...
DS-CDMA是在扩频技术上发展起来的多址接入方式,但在用户接入数量过载时难以保证高质量的通信性能。基于此,提出了一种基于稀疏图的DS CDMA系统。该系统以低密度二分图的形式来描述扩频码片和用户之间的关系,使得参与通信的每个用户只在少量码片上进行非零位扩频调制,最大限度地减少了用户间的相互干扰。借助图模型的相关理论,把适合于稀疏图的置信度传播算法应用于该系统,进行多用户检测,通过码片与用户之间的...
基于RJ-MCMC的DS-CDMA信号扩频码与信息序列盲估计
直扩码分多址 可逆跳跃 马尔科夫链蒙特卡罗 后验分布
2014/4/11
针对非合作低信噪比环境下的DS-CDMA信号参数估计问题,在分析信号模型的基础上,提出一种基于可逆跳跃的马尔科夫链蒙特卡罗(RJ-MCMC)扩频序列和信息序列联合估计算法。该算法通过建立信号参数和用户个数的联合后验分布模型,迭代抽样得到待估分布的样本,并有效地在不同维数的子空间中跳转,从而构造一条马尔科夫链,使其平稳分布为待估参数的后验分布。仿真结果表明,该算法在功率相同和不同的条件下均能适应较低...
卫星认知无线电CDMA上行链路功率控制
动态频谱租赁 码分多址 纳什均衡 系统容量
2013/5/28
功率控制和动态频谱接入是提高卫星通信中频谱利用率的关键技术。非注册用户以频谱租赁方式可对注册用户付出的代价进行补偿,亦可完成自身通信需求。针对注册用户和非注册用户给出不同的效用函数,对由两种用户作为参与者建立的博弈模型进行纳什均衡求解,之后通过最大化系统容量条件完成效用占优选择,得到最优化功率分配策略。该策略可满足两种用户自身需求,亦可使系统通信容量最大。对于其性能,给出了两种用户数量和发送功率的...
通过分析Multi-Rate DS/CDMA信号特性,建立的Multi-Rate DS/CDMA系统模型与线性混合的盲源分离模型一致,针对异、同步信号的不同特性,提出不同循环分段降维方法:对异步系统而言,采用2倍扩频周期为间隔对接收信号进行分割,利用Fast-ICA算法盲估计同一扩频周期用户的扩频序列,基于矢量2范数基础上估计各用户失步时间,并依此截取得到各用户的实际扩频序列,然后,循环至次大扩频...