Patent ID: 9166858
Filing Date: 2015-10-20
Classification: H04L

Abstract:
1. A method of modulation delivering an OQAM type multicarrier signal, comprising: implementing by a modulator device a step of transformation, from the frequency domain to the time domain, of a set of M real data symbols delivering a set of M transformed symbols, called a complete transformation step, said complete transformation step comprising the following sub-steps performed by the modulator device: applying a partial Fourier transform to the set of M real data symbols delivering a first subset of C transformed symbols of said set of M transformed symbols with C being strictly smaller than M; and obtaining, from said first subset, a second subset of (M-C) transformed symbols of said set of M transformed symbols, said second subset of (M-C) transformed symbols being the subset complementary to said first subset of C transformed symbols of said set of M transformed symbols, wherein obtaining determines a first part of said second subset from a first part of said first subset, in using a first mathematical relationship, and determines a second part of said second subset from a second part of said first subset, in using a second mathematical relationship, and wherein said first and second parts of said first subset, and said second subset respectively are complementary, wherein, for a prototype filter with a length L equal to qM+2p, with q and p being integers such that q≧0 and 0≦p≦M/2−1 and M divisible by 4, if 0≦p≦M/4−1, then said first mathematical relationship is expressed in the form u said second mathematical relationship is expressed in the form u else if M/4≦p≦M/2−1, then said first mathematical relationship is expressed in the form u said second mathematical relationship is expressed in the form u M−k−1,n =(−1) n u 2p−M/2+k,n *, for an integer k such that 0≦k≦3M/4−p−1, with: u * the conjugate operator.