Abstract
PROBLEM TO BE SOLVED: To improve accuracy in propagation path estimation when receiving signals from a plurality of antennas.
SOLUTION: A preamble A generator 010 and a preamble B generator 011 generate a preamble A and a preamble B respectively. The preamble A is output to multiplex units 014 015 and the preamble B is output to phase rotation units 012 013. In the phase rotation units 012 013 having the preamble B input thereto continuous phase rotation is given to each subcarrier of the preamble B. In the phase rotation unit 012 phase rotation is not given and phase rotation is given to the preamble B in only the phase rotation unit 013. To the two preamble signals each time shift amount different from the other is added.
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