Data transmission in multi-user systems with adaptive modulation OFDM

摘要

The invention relates to a method for processing information (DS) to be sent via radio, according to which first bits (DS1) represent a first number of N-tuples and second bits (DSN) represent a second number of N-tuples. The first bits are to be sent using a first group of sub-bands of a frequency band (CHUNK 1), and the second bits are to be sent using a second group of sub-bands of the frequency band (CHUNK N). A first modulation method (MOD X) is used for the first bits and a second modulation method (MOD X) is used for the second bits. The first bits are rearranged, forming M-tuples, and a symbol is formed from each M-tuple according to the first modulation method. The second bits are rearranged, forming P-tuples, and a symbol is formed from each P-tuple according to the second modulation method, and M ? P. The invention also relates to a corresponding method for processing information received by radio, and base stations and mobile radio stations for carrying out the method.