A method in a transmitter for use in multi-carrier broadband wireless communications, said method comprising: receiving, from an intended receiver of a transmission, information that includes the following: - a chunk index that identifies a locally preferred chunk comprising a first group of carrier frequencies that the intended receiver of the transmission has selected for use in said transmission, - communication quality information indicative of communication quality associated with transmitting on said first group of carrier frequencies, and - a distance value indicative of another locally preferred chunk comprising a further group of carrier frequencies that said intended receiver has identified as preferred for transmission, wherein said distance value is indicative of a difference between a chunk index associated with said another locally preferred chunk comprising said further group of carrier frequencies and the chunk index associated with said locally preferred chunk comprising said first group of carrier frequencies; and based on said communication quality information, selecting a modulation and coding scheme for use in transmitting on said first group of carrier frequencies and said further group of carrier frequencies, assuming that the same channel quality is associated with said first and further groups of carrier frequencies. receiving, from an intended receiver of a transmission, information that includes the following: - a chunk index that identifies a locally preferred chunk comprising a first group of carrier frequencies that the intended receiver of the transmission has selected for use in said transmission, - communication quality information indicative of communication quality associated with transmitting on said first group of carrier frequencies, and - a distance value indicative of another locally preferred chunk comprising a further group of carrier frequencies that said intended receiver has identified as preferred for transmission, wherein said distance value is indicative of a difference between a chunk index associated with said another locally preferred chunk comprising said further group of carrier frequencies and the chunk index associated with said locally preferred chunk comprising said first group of carrier frequencies; and - a chunk index that identifies a locally preferred chunk comprising a first group of carrier frequencies that the intended receiver of the transmission has selected for use in said transmission, - communication quality information indicative of communication quality associated with transmitting on said first group of carrier frequencies, and - a distance value indicative of another locally preferred chunk comprising a further group of carrier frequencies that said intended receiver has identified as preferred for transmission, wherein said distance value is indicative of a difference between a chunk index associated with said another locally preferred chunk comprising said further group of carrier frequencies and the chunk index associated with said locally preferred chunk comprising said first group of carrier frequencies; and based on said communication quality information, selecting a modulation and coding scheme for use in transmitting on said first group of carrier frequencies and said further group of carrier frequencies, assuming that the same channel quality is associated with said first and further groups of carrier frequencies.