海面的红外被动成像

本文在研究海面的红外成像特性中,建立了基于刚体的双尺度成像模型,从被动成像方面讨论了海面辐射特性的变化规律.该模型仿真结果很好地说明了风向对海面红外被动成像特性的影响.

Novel Multiuser Interference Canceling Scheme in TDD-CDMA Systems

Conventional multiuser interference canceling is always done in the uplink.In this paper,a novel multiuser processing scheme used in the downlink of TDD CDMA (Time division dupler code division multiple access) systems is proposed.In TDD CDMA systems,the downlink multipath channel parameter can be estimated from the uplink.In this paper,we use the instantaneous channel parameter to calculate the spreading spectrum code and despreading code for different users.We present the optimal criterion of the generation of the spreading code and despreading code,so that the multiple access interference can be greatly reduced.Numerical results show that our scheme can geratly increase the signal to interference and noise ratio,compared with conventional CDMA systems which use Gold sequence as the spreading code.