Radio transmitting apparatus and radio transmission method

Details Radio transmitting apparatus and radio transmission method Radio transmitting apparatus and radio transmission method

2008-01-29

2008-01-29

Nguyen, Duc M. (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S349000, C455S101000, C455S103000

Reexamination Certificate

active

07324481

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 section12of 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 section11.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.

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