| 摘要 |
PROBLEM TO BE SOLVED: To improve demodulation precision of a plurality of modulated signals, transmitted simultaneously, on a receiver side. SOLUTION: A transmit signal generating method or a transmit signal generating apparatus is provided for transmitting a modulated signal generated using an OFDM system, to a plurality of terminals using a plurality of antennas. A transmit frame having a preamble section wherein a control symbol group is arranged and a data section wherein data symbols are arranged is used; and a symbol 103 for MIMO channel estimation for separating a plurality of modulated signals transmitted from the plurality of antennas are arranged successively in a specified period of the preamble section in a frequency axis direction over a plurality of subcarriers, and a pilot symbol 1801 is inserted in the data section for at least one or more subcarriers. COPYRIGHT: (C)2009,JPO&INPIT
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