在SM (空间调制)系统中, 基于差分编码思想对4根发射天线情况提出了一种新的DSM (差分空间调制)方案。在接收端解调时采用差分直接检测法, 即根据前后相邻两时刻的接收信号差进行解调。该方法只需测定初始的信道参数, 后续接收端与发送端均不需要知道信道状态信息, 通信过程中可以抵抗信道参数变化。对DSM方案进行了性能仿真, 结果表明, 该四进制DSM方案能够实现通信, 并且具有较好的抗信道参数变化性能。

In the spatial modulation system, a new differential spatial modulation scheme is proposed for four transmitting antennas based on differential coding. The scheme adopts the differential detection in the receiver. The differential detection is according to the difference of received signal in adjacent time,and only the initial channel parameters are required. The channel state information is not required at the transmitter and receiver sides.The change of channel parameters can be ignored in the process of communication. The simulation results show that the quaternary differential spatial modulation can not only realize communication, but also has good ability to resist the change of channel parameters.