In the fifth generation (5G) new radio (NR) wireless communication system, using Multiple Input Multiple Output (MIMO) system for signal transmission and reception of the millimeter wave frequency band can effectively improve the data rate performance and the received signal quality. Besides, precoding is an important method of beamforming in MIMO transmission. With the properly selected precoding matrices, transmitter and receiver can adjust the transmitting and receiving behaviors in accordance with the changes of the current channel state to reduce the interferences between users and increase the received signal strength. In this paper, a low complexity precoding selection method is proposed based on the steering angle characteristics of the precoding matrices of 5G NR. Besides, we used the software defined radio to implement the precoding selection following the requirement of the specifications of 5G. With this implementation, both transmitter and receiver can determine the suitable precoding matrices according to different precoding selection methods. Results showed that with a little error vector magnitude performance degradation, the proposed precoding selection method can reduce at least 50% of the required computational complexity of the full search method.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.