| 摘要 |
A data communication apparatus and method based on OFDMA are provided. In a first user transmitting unit through which a user transmits user information to a base station in units of first symbol blocks each including M symbols, a first encoder generates a first sub-block composed of M<SUB>u </SUB>user symbols for a u-th user by encoding the user information. A first block repeater repeats the first sub-block L<SUB>u </SUB>times to generate M symbols. A first multiplier multiplies the M symbols by gamma<SUB>u </SUB>exp(j2pikm<SUB>u</SUB>/M) and outputs a u-th user signal. A first cyclic extension symbol inserter inserts a cyclic extension symbol into the u-th user signal and generates a single complete first symbol block. Accordingly, data transmission speed can be freely changed, a very small PAR can be provided, influence of the signal interference is greatly reduced, interference occurring between received blocks due to channels can be prevented, and distortion between channels can be effectively compensated for.
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