METHOD AND SYSTEM OF ORTHOGONALIZING SIGNAL TRANSMITTED FROM BS APPLIED TO OFDM ACCESS

摘要

A method of orthogonalizing signals transmitted from a BS in an OFDMA system, at a transmitting end, includes a) performing encoding, interleaving and modulation on information bits; b) allocating sub-carriers with equivalent intervals to a sub-channel, and dividing channels into two parts of a cell edge user channel and a center area channel; c) mapping modulated information symbols to the corresponding sub-carriers; d) orthogonalizing on the two parts of channels; e) for a cell edge user, according to result of step b), dividing an OFDM symbol into subsections of equal length; f) multiplying the subsections obtained from step e) by a corresponding orthogonalizing sequence of the cell; g) adding the OFDM symbols of the two parts together to form a whole OFDM symbol; h) adding a cyclic prefix; and i) performing D/A conversion, RF processing and feedback over a transmitting antenna on a base-band signal.