基于LDPC的MIMO卫星扩频通信系统

MIMO即多输入多输出通信技术,因其可以增大信道容量,而被广泛应用于各类通信系统中。在卫星通信系统中应用MIMO技术,主要面临同道干扰和噪声两个问题。文中介绍了克服同道干扰的MIMO卫星通信线性检测系统,并为解决上述问题,在输入端引入扩频技术和接近香农极限的LDPC编码,而在输出端进行解扩和译码,既减小了同道干扰,又明显削弱了噪声,从而实现了良好的性能。

LDPC-Based MIMO Satellite Spreading Communication Systems

MIMO technique,namely the multiple-input-multiple-output technique,is widely used in various communication systems as it can enlarge channel capacity.In satellite communication systems,there are mainly two problems,co-channel interruption and noise,confronting MIMO application.In this paper,the MIMO linear detection system used in satellite communications aiming at overcoming co-channel interruption is introduced.Spreading and the Shannon-limitation-approaching LDPC encoding are introduced at input,while at output dispreading and decoding are done.Thus,both the co-channel interference and noise are significantly reduced and a good performance for this system is reached.