Adaptively selecting fewer sub-carriers in poor quality multicarrier links

摘要

A wireless communication system (eg. OFDM) comprises a multiple-carrier system in which the number of sub-carriers is selected by an allotment control unit 107 according to the line quality. A signal to noise ratio (SNR) as measured by a subcarrier disposition determining unit (208, fig. 2) determines which M sub-carriers (from a total N) are selected for use in the next transmission via an adaptive feedback to the control unit 107 (R next to S cin ). A smaller number of subcarriers is used when the line quality is unsatisfactory or noisy, and those in the same group of K similar sub-carriers are preferably selected.