| 摘要 |
Improving the accuracy of estimation of channel responses in receiving signals from a plurality of antennas is disclosed. A transmitting device of a base station includes a preamble A generating unit 010 , a preamble B generating unit 011 , phase rotating units 012 and 013 , multiplexing units 014 and 015 , an forward error correction coding unit 016 , an S/P converting unit 017 , a mapping unit 018 , a changeover switch 019 , IDFT (or IFFT) units 020 and 026 , P/S converting units 021 and 027 , GI (Guard Interval) inserting units 022 and 028 , D/A converting units 023 and 029 , radio transmitting units 024 and 030 and antenna units 025 and 031 . In the preamble A generating unit 010 and the preamble B generating unit 011 , a preamble A and a preamble B (see the packet format in FIG. 1 ) are generated, respectively. The preamble A is outputted to the multiplexing units 014 and 015 , while the preamble B is outputted to the phase rotating units 012 and 013 . The phase rotating units 012 and 013 to which the preamble B has been inputted give continuous phase rotation to subcarriers of the preamble B. In the transmitting device of the base station according to this embodiment, the phase rotating unit 012 does not give phase rotation, but only the phase rotating unit 013 gives phase rotation to the preamble B.
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