| 摘要 |
PROBLEM TO BE SOLVED: To provide 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, in which reception quality is improved by reducing pilot symbol and data symbol quantization errors. SOLUTION: A transmission power changing section 12 adjusts a pilot symbol signal level so as to match a 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, thereby 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. COPYRIGHT: (C)2007,JPO&INPIT
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