随着人们对通信容量需求的不断增长,设计具有互相关旁瓣小,数目众多的扩频序列成为研究的热点。将混沌映射引入扩频序列的设计,具有保密能力强,序列数目众多等优点。设计一种新型的基于T an t映射量化的二值混沌序列,给定不同的初值,就...随着人们对通信容量需求的不断增长,设计具有互相关旁瓣小,数目众多的扩频序列成为研究的热点。将混沌映射引入扩频序列的设计,具有保密能力强,序列数目众多等优点。设计一种新型的基于T an t映射量化的二值混沌序列,给定不同的初值,就可以产生不同的扩频序列,它具有良好的负自相关特性,相对于高斯白序列可以提高14.3%的系统容量。仿真结果显示,仿真结果与理论值接近,非常适合作系统的扩频码。展开更多
In this letter, the detection of asynchronous DS-CDMA signal with multipath fading and interference from neighboring cells is studied. A novel multiuser detector based on Gibbs sampler is proposed, in which Gibbs samp...In this letter, the detection of asynchronous DS-CDMA signal with multipath fading and interference from neighboring cells is studied. A novel multiuser detector based on Gibbs sampler is proposed, in which Gibbs sampler is employed to perform the Bayesian multiuser detection according to the linear group-blind decorrelator output. Since Gibbs sampler is dependent of parameter estimation that can be improved by the output of the detector, an enhanced Gibbs sampler based detector using the improved parameter estimation is put forward. The novel multiuser detection technique has the advantages of high performance and wide applications. Computer simulations show its effectiveness.展开更多
文摘随着人们对通信容量需求的不断增长,设计具有互相关旁瓣小,数目众多的扩频序列成为研究的热点。将混沌映射引入扩频序列的设计,具有保密能力强,序列数目众多等优点。设计一种新型的基于T an t映射量化的二值混沌序列,给定不同的初值,就可以产生不同的扩频序列,它具有良好的负自相关特性,相对于高斯白序列可以提高14.3%的系统容量。仿真结果显示,仿真结果与理论值接近,非常适合作系统的扩频码。
文摘In this letter, the detection of asynchronous DS-CDMA signal with multipath fading and interference from neighboring cells is studied. A novel multiuser detector based on Gibbs sampler is proposed, in which Gibbs sampler is employed to perform the Bayesian multiuser detection according to the linear group-blind decorrelator output. Since Gibbs sampler is dependent of parameter estimation that can be improved by the output of the detector, an enhanced Gibbs sampler based detector using the improved parameter estimation is put forward. The novel multiuser detection technique has the advantages of high performance and wide applications. Computer simulations show its effectiveness.
