Most existing overlay multicast approaches refuse to consider any network layer support no matter whether it is available or not. This design principle greatly increases the complexity of the routing algorithms and ma...Most existing overlay multicast approaches refuse to consider any network layer support no matter whether it is available or not. This design principle greatly increases the complexity of the routing algorithms and makes the overlay topologies incompatible with the underlying network. To address these issues, topology-aware overlay multicast over IP multicast networks (TOMIMN) was proposed as a novel overlay multicast protocol, which exploits the cooperation between end-hosts and IP multicast routers to construct a topology-aware overlay tree. Through a little modification to protocol independent multicast sparse mode (PIM-SM), a multicast router is able to receive registration from nearby group members and redirect passing-by join requests to them. Due to the multicast router's support, TOMIMN organizes its group members into an overlay multicast tree efficiently, which matches the physical network topology well.展开更多
在协作多点传输(coordinated multiple points transmission,CoMP)系统中,为了提高小区边缘用户传输速率和系统总吞吐量,提出了一种联合天线选择和功率分配的优化算法。在基于信道容量增量的天线选择策略(antenraselection lased on cap...在协作多点传输(coordinated multiple points transmission,CoMP)系统中,为了提高小区边缘用户传输速率和系统总吞吐量,提出了一种联合天线选择和功率分配的优化算法。在基于信道容量增量的天线选择策略(antenraselection lased on capacity increment,CIAS)中,推导了当用户端采用最大比合并时用户信道容量的表达式,并根据所设定的信道容量增量选择出所有满足条件的天线;在最优功率分配算法(optimal power allocation,OPA)中,推导了协作多点多用户系统中用户传输速率的表达式,在总功率受限的情况下通过采用优化的迭代功率分配算法,得到了最优的功率分配。理论分析和仿真结果表明,与等功率分配策略(equal power allocation,EPA)和功率与信道增益成正比的功率分配策略(proportion to channel gain,PCG)相比,联合了天线选择和功率分配的算法不仅能最大提升对边缘用户的传输速率,而且能更好地提高系统的信道容量。展开更多
现在的我们知道以太网是在1972年由xerox PARC计算机科学实验室创建的。PARC(The Palo AIto Re—searchce Cener，帕洛阿尔托研究中心)是由施乐(Xerox)公司在1970年建立的，当时被定义为“office of the Future(未来的办公室)”。在197...现在的我们知道以太网是在1972年由xerox PARC计算机科学实验室创建的。PARC(The Palo AIto Re—searchce Cener，帕洛阿尔托研究中心)是由施乐(Xerox)公司在1970年建立的，当时被定义为“office of the Future(未来的办公室)”。在1970年到1980年之间,Xerx PARC是一个只有数十名成员的小实验室。展开更多
文摘Most existing overlay multicast approaches refuse to consider any network layer support no matter whether it is available or not. This design principle greatly increases the complexity of the routing algorithms and makes the overlay topologies incompatible with the underlying network. To address these issues, topology-aware overlay multicast over IP multicast networks (TOMIMN) was proposed as a novel overlay multicast protocol, which exploits the cooperation between end-hosts and IP multicast routers to construct a topology-aware overlay tree. Through a little modification to protocol independent multicast sparse mode (PIM-SM), a multicast router is able to receive registration from nearby group members and redirect passing-by join requests to them. Due to the multicast router's support, TOMIMN organizes its group members into an overlay multicast tree efficiently, which matches the physical network topology well.
文摘在协作多点传输(coordinated multiple points transmission,CoMP)系统中,为了提高小区边缘用户传输速率和系统总吞吐量,提出了一种联合天线选择和功率分配的优化算法。在基于信道容量增量的天线选择策略(antenraselection lased on capacity increment,CIAS)中,推导了当用户端采用最大比合并时用户信道容量的表达式,并根据所设定的信道容量增量选择出所有满足条件的天线;在最优功率分配算法(optimal power allocation,OPA)中,推导了协作多点多用户系统中用户传输速率的表达式,在总功率受限的情况下通过采用优化的迭代功率分配算法,得到了最优的功率分配。理论分析和仿真结果表明,与等功率分配策略(equal power allocation,EPA)和功率与信道增益成正比的功率分配策略(proportion to channel gain,PCG)相比,联合了天线选择和功率分配的算法不仅能最大提升对边缘用户的传输速率,而且能更好地提高系统的信道容量。
文摘现在的我们知道以太网是在1972年由xerox PARC计算机科学实验室创建的。PARC(The Palo AIto Re—searchce Cener，帕洛阿尔托研究中心)是由施乐(Xerox)公司在1970年建立的，当时被定义为“office of the Future(未来的办公室)”。在1970年到1980年之间,Xerx PARC是一个只有数十名成员的小实验室。
