CODE BOOK CREATION METHOD, CODE BOOK CREATION DEVICE, AND INITIAL CODE BOOK CREATION METHOD

摘要

Disclosed are a code book creation method and device and an initial code book creation method, for a wireless communications system. The code book creation method includes: a step in which the amplitude or power for channel status information for channels between a plurality of transmission antennas and a reception antenna is obtained; and a step in which elements of a codeword for an initial code book are dynamically mapped to the plurality of transmission antennas and a first code book is generated, on the basis of the amplitude or the power. The initial code book creation method includes: a step in which prescribed elements of the codeword are set to have a prescribed phase resolution; and a step in which the other elements of the codeword are set so as to be arranged in order of gradually increasing or gradually decreasing phase resolution. The order of arrangement between elements having the same phase resolution is arbitrary and the phase resolution is the number of phases possible for all elements in the same position for all codewords in the initial code book. As a result, the accuracy of the code book and the performance of the system are improved.