FIELD: radio engineering, communication.
SUBSTANCE: invention discloses a transmitting apparatus (400), having a modulator (410) for modulating each of a plurality of data streams at subcarrier frequencies of the corresponding frequency band in one group from one or more frequency channels; each frequency band occupies not more than a given maximum bandwidth which is less than or equal to the channel bandwidth; a bandwidth information generator (420) for generating bandwidth information which defines frequency bands corresponding to all data streams conveyed by said frequency channel; the bandwidth information includes a tuning frequency indicator which indicates tuning frequency, and a tuning frequency type indicator which indicates the type of tuning frequency indicated by said tuning frequency indicator, where said type is selected from a group comprising at least a first type which indicates bandwidth tuning frequency, and a second type which indicates the centre frequency of the frequency channel, and a transmitter (430) for transmitting said data streams modulated at subcarrier frequencies, and one or more copies of said bandwidth information in corresponding frequency positions in each frequency channel.
EFFECT: obtaining the required information for tuning to the required frequency.
23 cl, 14 dwg
