ժҪ �ڽ���ɢ����ֵ�ƶɢ�价����,MIMO(Multiple In Multiple Out)ϵͳ���ŵ�������������ֵ�ֲ�������,����ϵͳ�����½�.���������������һ����λ���뼼��.ͨ����Ϊ������ྶ,��ƶɢ�价���µĲ�̬��ؾ������Ϊ��̬����,�Ӷ�ʹMIMO�����ܹ�������ռ�����Ժ�ǿ��ƽ̹˥���ŵ�������Ӧ��,��չ��MIMO������Ӧ�÷�Χ;�����ڷ���û���ŵ���Ϣ���������Ȼ�ܹ���MIMO�ŵ���ЧΪ���������ŵ�,ʡȥ��Ԥ������ŵ���Ϣ�ķ���,������ϵͳ���Ӷ�.�������Ϸ����ͽ�����λ���뼼���Ļ���ԭ��,����������,���������۷���һ��.
In non-rich scattering propagation environment due to lack of angular spreading, non-uniform distribution of singular values of multiple in multiple out(MIMO) system transmission matrix causes a degradation of system capacity. To solve this problem a technology called phase coding was proposed. Phase coding transformed original singular channel transmission matrix to the non-singular matrix by creating multi-path deliberately. Distribution of transmission matrix singular values was improved and system capacity was improved as well. Using phase coding MIMO technology can be applied in the flat fading channel environment which has a very strong spatial correlation. So the application range of MIMO technology is expanded. Furthermore, MIMO channel can be transformed into parallel sub-channels without pre-coding at transmitter and feedback channel information from receiver, so system complexity is reduced. First theoretical analysis and basic principle of phase coding was discussed, followed with simulation results which verify theoretical analysis.