A communication device, comprising: a processor configured to: process a plurality of bits to generate a modulation symbol sequence based on one or more profiles that specify variable bit loading of bits per symbol over at least some modulation symbols of the modulation symbol sequence, wherein the modulation sequence includes first, second, third and fourth modulation symbols, and wherein the first and second modulation symbols are separated by an interleaver depth within the modulation symbol sequence, and wherein the third and fourth modulation symbols are separated by more than the interleaver depth and less than twice the interleaver depth within the modulation symbol sequence; and interleave the modulation symbol sequence to generate an orthogonal frequency division multiplexing, OFDM, symbol that includes the first modulation symbol within a first sub-carrier, the second modulation symbol within a second sub-carrier that is located adjacently to the first sub-carrier, the third modulation symbol within a third sub-carrier, and the fourth modulation symbol within a fourth sub-carrier that is located adjacently to the third sub-carrier; and a communication interface configured to transmit the OFDM symbol. a processor configured to: process a plurality of bits to generate a modulation symbol sequence based on one or more profiles that specify variable bit loading of bits per symbol over at least some modulation symbols of the modulation symbol sequence, wherein the modulation sequence includes first, second, third and fourth modulation symbols, and wherein the first and second modulation symbols are separated by an interleaver depth within the modulation symbol sequence, and wherein the third and fourth modulation symbols are separated by more than the interleaver depth and less than twice the interleaver depth within the modulation symbol sequence; and interleave the modulation symbol sequence to generate an orthogonal frequency division multiplexing, OFDM, symbol that includes the first modulation symbol within a first sub-carrier, the second modulation symbol within a second sub-carrier that is located adjacently to the first sub-carrier, the third modulation symbol within a third sub-carrier, and the fourth modulation symbol within a fourth sub-carrier that is located adjacently to the third sub-carrier; and process a plurality of bits to generate a modulation symbol sequence based on one or more profiles that specify variable bit loading of bits per symbol over at least some modulation symbols of the modulation symbol sequence, wherein the modulation sequence includes first, second, third and fourth modulation symbols, and wherein the first and second modulation symbols are separated by an interleaver depth within the modulation symbol sequence, and wherein the third and fourth modulation symbols are separated by more than the interleaver depth and less than twice the interleaver depth within the modulation symbol sequence; and interleave the modulation symbol sequence to generate an orthogonal frequency division multiplexing, OFDM, symbol that includes the first modulation symbol within a first sub-carrier, the second modulation symbol within a second sub-carrier that is located adjacently to the first sub-carrier, the third modulation symbol within a third sub-carrier, and the fourth modulation symbol within a fourth sub-carrier that is located adjacently to the third sub-carrier; and a communication interface configured to transmit the OFDM symbol.