公开(公告)号：US20130243132A1

公开(公告)日：2013-09-19

申请号：US13889614

申请日：2013-05-08

Applicant: HARRIS CORPORATION

Inventor： KIYOTAKA KOBAYASHI ,  YUTAKA MURAKAMI ,  MASAYUKI ORIHASHI

IPC: H04L27/26

CPC classification number: H04L27/2649 ,  H04W52/42

Abstract: A radio transmitting apparatus that has a plurality of antennas and changes the number of modulated signals transmitted simultaneously according to the propagation environment and so forth. A transmission power changing section 12 of a radio transmitting apparatus of the present invention adjusts the pilot symbol signal level so as to match the data symbol composite signal level according to the number of transmit modulated signals set by a modulated signal number setting section 11. By this means, the operating range of received pilot symbols and the operating range of received data symbols become approximately the same on the receiving side, enabling pilot symbol quantization error to be reduced. As a result, the precision of radio wave propagation environment estimation, time synchronization, and frequency offset estimation using pilot symbols improves, and consequently data reception quality improves.

Abstract translation: 具有多个天线的无线发送装置，根据传播环境等改变同时发送的调制信号的数量。 本发明的无线发送装置的发送功率变更部12根据由调制信号编号设定部11设定的发送调制信号的数量来调整导频符号信号电平，使其符合数据符号合成信号电平。通过 这意味着接收到的导频符号的操作范围和接收数据符号的操作范围在接收侧变得大致相同，从而能够降低导频符号量化误差。 结果，使用导频符号的无线电波传播环境估计，时间同步和频率偏移估计的精度提高，因此提高了数据接收质量。