MMSE channel estimation for two-port demodulation reference signals in new radio

Two-port demodulation reference signals (DMRS) have been employed in new radio (NR) recently. In this paper, we firstly propose a minimum mean square error (MMSE) scheme with full priori knowledge (F-MMSE) to achieve the channel estimation of two-port DMRS NR. When two ports are assigned different users, is not easy be obtained for one user. Then, present MMSE partial (P-MMSE). Finally, numerical results show that proposed schemes satisfactory performance. Moreover, both and bit ratio metrics, can better performance compared classical discrete Fourier transform based estimation. Particularly, P-MMSE delivers almost same F-MMSE by small amount prior knowledge.