| 摘要 |
An OFDM transmitter and receiver realizing high-speed cell search and having a reducible circuit scale. A base station device (100) serving as an OFDM transmitter comprises an SCH inserting section (125) for constructing a frame where a synchronization sequence in a predetermined position from the head of a first sub-frame is arranged and a synchronization sequence composed of the symbols of the former synchronization sequence and the symbols whose I, Q components are interchanged is arranged in a predetermined position from the head of a second sub-frame adjacent in the time-axis direction to the former sub-frame, an IFFT section (130), a P-SCH conversion section (135), and an RF transmitting section (150) for transmitting this frame. ; Thus, the receiving end of the frame can locate the position of either of the synchronization sequences and determine the frame timing from the position, thereby increasing the speed of the cell search. Though the P-SCH sequences placed in the sub-frames are different from one another, the multiplier used for correlation operation can be shared since only the I, Q components are interchanged. Therefore, the circuit scale of the receiving side can be decreased.
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