1. An apparatus for transmitting data, comprising: an orthogonal frequency division multiplexing (OFDM) encoder for loading: a first data on a sub-carrier of an OFDM symbol associated with an antenna; a second data on a sub-carrier of an another OFDM symbol associated with the antenna; said first and said second data on sub-carriers of OFDM symbols associated with an another antenna according to at least one mapping rule, wherein said at least one mapping rule is a conjugate mapping rule; said antenna transmits said first data; said antenna transmits said second data; and said another antenna transmits said first and said second data; wherein said transmission of said first data with said another antenna is transmitted subsequent to said transmission of said first data with said antenna; and said transmission of said second data with said antenna is transmitted subsequent to said transmission of said second data with said another antenna.