| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an OFDM transmitter capable of estimating a propagation path precisely on multiple access using an OFDMA method without changing the number of pilot symbols per resource block. <P>SOLUTION: An OFDM signal transmitter includes a plurality of mapping patterns each of which has the same number of pilot symbols per resource block and different frequency spacing of pilot symbol allocation depending on delay spread of a transmission path. A pilot insertion pattern control circuit 6 stores a delay spread value and a corresponding mapping pattern, chooses a mapping pattern associated with a delay spread of an input transmission path, directs the chosen mapping pattern to a mapping circuit 1 and a pilot insertion circuit 3. The mapping circuit 1 allocates data to resource blocks according to the mapping pattern, and the pilot insertion circuit 3 inserts the pilot symbols. <P>COPYRIGHT: (C)2012,JPO&INPIT |
