We provide a broad look at the field of limited feedback in wireless communication.We review works of limited feedback with various combinations of single antenna,multiple antenna,single-user and multiuser technology ...We provide a broad look at the field of limited feedback in wireless communication.We review works of limited feedback with various combinations of single antenna,multiple antenna,single-user and multiuser technology and provide a synopsis of the role of limited feedback in wireless communication systems.We also study how the feedback rate can be minimized without losing the gains due to adaptive transmission and multiuser diversity.It seems that the best possible feedback scheme is not invented yet.As another conclusion is that there are still many issues to study before the scheme can be used in practice.展开更多
We analyze the development of quantum cryptography communication,including analyze the problems lie in the existent literatures and give the resolve methods according to these problems.Then discuss the quantum cryptog...We analyze the development of quantum cryptography communication,including analyze the problems lie in the existent literatures and give the resolve methods according to these problems.Then discuss the quantum cryptography communication for wireless networks and also point out the shortcoming of current research and the future of quantum wireless networks.展开更多
This paper focuses on the applications of the support vector machines in solving the problem of blind recovery in digital communication systems.We introduce the technique of support vector machines briefly,the develop...This paper focuses on the applications of the support vector machines in solving the problem of blind recovery in digital communication systems.We introduce the technique of support vector machines briefly,the development of blind equalization and analyze the problems which need to be resolved of the blind problems.Then the applicability of support vector machines in blind problem is highlighted and deduced.Finally,merit and shortage of blind equalization using support vector machines which is already exist to be discussed and the direction of further research is indicated.展开更多
As a new type optical fiber,because of its particular optical properties,photonic crystal fibers(PCFs) have attracted the academic and industrial field widespread attention.So,the researches about PCFs have made great...As a new type optical fiber,because of its particular optical properties,photonic crystal fibers(PCFs) have attracted the academic and industrial field widespread attention.So,the researches about PCFs have made great progress in recent decade.In this paper,two kinds of PCFs constructions are numerically investigated and its leakage-loss properties are simulated.Based on the results of calculations,both the two types of PCFs are fabricated using glass capillary tube stacking.And the process of fiber drawing is described in this paper.展开更多
基金supported by the National Natural Science Foundation of China (No. 60972041, 60572130)Natural Science Fundamental Research Pro-gram of Jiangsu Universities (No. 08KJD510001)+4 种基金PH. D. Program Foundation of Ministry of Education (No. 20080293004)National Special Project(2009ZX03003-006)National Basic Research Program of China (No. 2007CB310607)Graduate Innovation Program (No.CX09B-146Z)the pro-ject of NJUPT (NY206061)
文摘We provide a broad look at the field of limited feedback in wireless communication.We review works of limited feedback with various combinations of single antenna,multiple antenna,single-user and multiuser technology and provide a synopsis of the role of limited feedback in wireless communication systems.We also study how the feedback rate can be minimized without losing the gains due to adaptive transmission and multiuser diversity.It seems that the best possible feedback scheme is not invented yet.As another conclusion is that there are still many issues to study before the scheme can be used in practice.
基金supported by the National High Technology Research and Development Program of China(863 Program)(No. 2006AA01Z208)Nataral Sci-ence Foundation of Jiangsu Province(No. BK2007236)Six Projects Sponsoring Talent Summits of Jiangsu Province(No. SJ207001)
文摘We analyze the development of quantum cryptography communication,including analyze the problems lie in the existent literatures and give the resolve methods according to these problems.Then discuss the quantum cryptography communication for wireless networks and also point out the shortcoming of current research and the future of quantum wireless networks.
基金supported in part by the National Natural Science Foundation of China(No.60772060 )the project of NJUPT(No.NY207056)
文摘This paper focuses on the applications of the support vector machines in solving the problem of blind recovery in digital communication systems.We introduce the technique of support vector machines briefly,the development of blind equalization and analyze the problems which need to be resolved of the blind problems.Then the applicability of support vector machines in blind problem is highlighted and deduced.Finally,merit and shortage of blind equalization using support vector machines which is already exist to be discussed and the direction of further research is indicated.
文摘As a new type optical fiber,because of its particular optical properties,photonic crystal fibers(PCFs) have attracted the academic and industrial field widespread attention.So,the researches about PCFs have made great progress in recent decade.In this paper,two kinds of PCFs constructions are numerically investigated and its leakage-loss properties are simulated.Based on the results of calculations,both the two types of PCFs are fabricated using glass capillary tube stacking.And the process of fiber drawing is described in this paper.
