A method of transmitting data symbols via Orthogonal Frequency Division Multiplexed (OFDM) symbols, that includes forming data symbols into pairs, generating a first pair of modulation symbols for each of the pairs of data symbols, forming a first version of the OFDM symbols by modulating the sub-carriers allocated for carrying the data with the first and second modulation symbols, and modulating the one or more pilot carriers of the first version of the OFDM symbol. The method also includes generating a second pair of modulation symbols for each of the pairs of data symbols, forming a second version of the OFDM symbol by modulating the sub-carriers allocated for carrying the data with the third and fourth modulation symbols, modulating the one or more pilot carriers of the second version of the OFDM symbols and transmitting the first version of the OFDM symbol, and the second version of the OFDM symbol.