Patent ID: 9048914
Filing Date: 2015-06-02
Classification: H04B,H04J,H04L

Abstract:
1. A radio base station device wirelessly communicating with a mobile station device, the radio base station device comprising: a plurality of transmission antennas; a reference signal generator for generating orthogonal downlink reference signals, the orthogonal downlink reference signals using radio resources allocated in two dimensions of frequency direction and time direction, and radio resources that are of same frequency and allocated in the time direction being mapped with orthogonal code for orthogonalization between transmission layers; a multiplexer for multiplexing transmission data and the orthogonal downlink reference signals; and a transmitter for transmitting transmission signals obtained by multiplexing the transmission data and the orthogonal downlink reference signals at the multiplexer, via the transmission antennas in the transmission layers, which the mobile station device having: wherein a mapping direction of the orthogonal codes mapped to the radio resources for the orthogonal downlink reference signals adjacent in the time direction is reversed between the radio resources adjacent in the frequency direction.