摘要：在数字通信中,传输速率和传输可靠性是两个重要指标,也是互相制约的指标,他们遵循通信原理的重要基本理论——奈奎斯特(Nyquist)准则。在很多教科书上,对于该准则的证明比较繁琐,在教学中造成困难。用简单的方法改变了该准则的传统证明,先证明一个命题,进一步分析了克服码元串扰的一般条件,并从这一点出发,提出对实际滤波器的要求,提出数字通信中的滤波器的具体设计方法,也就是互补对称的滚降方法,可以消除码间串扰,提高通信系统的可靠性。最后,对“Nyquist”准则作了通俗的描述。

摘要：Low Earth Orbit (LEO) satellites provide short round-trip delays and are becoming in- creasingly important. One of the challenges in LEO satellite networks is the development of specialized and efficient routing algorithms. To satisfy the QoS requirements of multimedia applications, satellite routing protocols should consider handovers and minimize their effect on the active connections. A distributed QoS routing scheme based on heuristic ant algorithm is proposed for satisfying delay bound and avoiding link congestion. Simulation results show that the call blocking probabilities of this al- gorithm are less than that of Shortest Path First (SPF) with different delay bound.

摘要：《电信科学》是由中国通信学会和人民邮电出版社共同主办的电信工程技术刊物,创刊于1956年。《电信科学》以报道通信科技的最新成果,介绍新的通信理论和技术知识,交流科研、设计、施工、生产和维护方面的实用技术和先进经验。