Patent Document ID: 8787482
Application ID: 13635905
Patent Flag: 1

Claim One:
1. A method for selecting a pre-coding matrix in a closed loop Multi-Input Multi-Output (MIMO) system, comprising (A) traversing all pre-coding matrices and respectively calculating a Carrier to Interference Noise Ratio (CINR) corresponding to each pre-coding matrix; (B) obtaining a Modulation Coding Scheme (MCS) according to a CINR corresponding to a pre-coding matrix, calculating a spectral efficiency corresponding to the MCS, and selecting a pre-coding matrix with a largest spectral efficiency, wherein the Step B comprises: (B1) mapping CINRs to MCS initial values (MCSinits) according to a CINR-MCSinit mapping relation table, and filtering the MCSinits; (B2) calculating a modification value ΔMCS of a filtered MCSinit; (B3) modifying the filtered MCSinit with the modification value ΔMCS to obtain the MCS; (B4) calculating the spectral efficiency corresponding to the MCS, selecting the pre-coding matrix with the largest spectral efficiency, converting the MCS into a corresponding Channel Quality Indicator (CQI), and recording a Rank (RI) corresponding to the selected pre-coding matrix.