多用户MIMO下行系统中的仿射投影解码方法

Affine projection based decoder in a multiuser MIMO downlink system

针对多用户下行MIMO系统,基站端有M根传输天线,用户端有1根接收天线的情况,该文提出了一种名为仿射投影译码器的译码方法.该方法采用对角空时码,在发送端不知道信道状态信息的情况下同时给所有用户发送信息.应用仿射投影技术,用户端可以完全地消除用户间的干扰.该文还对这个新译码器的性能,包括可达速率域和自由度进行了分析.最后,仿真证实了分析结果.

For the downlink of a multiuser（MU） multiple-input multiple-output（MIMO） system with M transmitting antennas at the base station and single receiving antenna at each user, new decoding methods, calledaffine projection decoders, are proposed in this paper and illustrated based on a diagonal space-time block code,under the assumption that the transmitter does not have channel state information（CSI） and transmits signals simultaneously to each user. In these decoders, the techniques for affine projection are applied, and user interference can be eliminated completely. In addition, the performances of these new decoders, such as the achievable rate regions and regions of degree of freedom（Do F）, are analyzed. Simulations confirm our analysis.