| 摘要 |
A method and apparatus for transmitting a preamble for frame synchronization and channel estimation in a MIMO-OFDM communication system are provided. An OFDM communication system using Q transmit antennas generates a base preamble sequence including a CP and an orthogonal sequence. If Q<=a predetermined number M, a preamble sequence for a kth antenna is S(t-(k-1)T/Q). If Q>M and k<=M, the preamble sequence transmitted for the kth antenna is S(t-(k-1)T/Q). If Q>M and k>M, the preamble sequence for the kth antenna is (-1)<SUP>(ps-1)</SUP>S(t-(k-1)T/Q). Here, S(t) is the orthogonal sequence, T is the period of the orthogonal sequence, and PS is an index indicating a transmission period of the preamble sequence. The preamble sequences are at least twice transmitted from the Q transmit antennas.
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