In the large-scale MU-MISO system, this paper studied the spectral efficiency affected by the channel and power allocation in spatially correlated channels. Firstly, it derived the transmit correlation matrix of the user from steering matrix which was determined by the wave path difference of the transmission signal. Then it established spatial correlation channel under the large-scale shadow fading and the scattering environment with Gaussian distribution. Based on the spatial correlation channel, it simulated the precoding which could reduce the interference between multiple users for the spectral efficiency performance. Finally, this paper proposed a power allocation algorithm that made the spectrum efficiency maximized in the scenario where the transmit power was limited and signal to interference plus noise ratio of each user was limited in receive signal. The simulation shows that the spectral efficiency of RZF precoding in spatially correlated channels is better than that of MRT precoding. And compared with the average power allocation, the spectral efficiency with the proposed algorithm which has strong theoretical and practical significance has the improvement.

[2020-01-05] Printed Article /doc/2018.07.0467/v2