METHOD, DEVICES AND COMPUTER PROGRAM PRODUCT FOR MODULATION AND DEMODULATION DELIVERING OFDM/OQAM SYMBOLS

摘要

A method is provided for modulating a real data stream grouped into blocks of nb.M real data, where M is the number of carriers and nb is an integer greater than or equal to 2. The method includes, for a block of real data: a first modulation by a first modulator of the first M/2 data, delivering a first set of modulated carriers; a second modulation by a second modulator of the following (nb−1).M data, delivering a second set of (nb−1).M modulated carriers; a third modulation by a third modulator of the last M/2 data, delivering a third set of modulated carriers; and a superposition of the first, second and third sets, forming a block of OFDM/OQAM symbols of length nb.M/2, the first set being superposed with the start of the second set and the third set being superposed with the end of the second set.

主权项

1. A method comprising:
modulating a stream of real data, implementing a prototype filter of a length smaller than or equal to M and delivering blocks of OFDM/OQAM symbols, wherein pieces of said real data are grouped together in blocks of data of nb.M real data where M is the number of carriers of one of said blocks of OFDM/OQAM symbols and nb is an integer greater than or equal to 2, and wherein modulating comprises, for a real data block: first modulation by a first modulator of the M/2 first pieces of data of said real data block, delivering a first set of modulated carriers; second modulation by a second modulator of the (nb−1).M following pieces of data of said real data block, delivering a second set of (nb−1).M modulated carriers; third modulation by a third modulator of the M/2 last pieces of data of said real data block delivering a third set of modulated carriers; superimposition of said first, second and third sets of modulated carriers after application of time shifts so as to form a block of OFDM/OQAM symbols with length nb.M/2, said first set being temporally superimposed on the start of a second set and said third set being temporally superimposed on the end of the second set.