| 摘要 |
A method for multi-carrier transmission of a signal including OFDM blocks formed from N carriers modulated by a constellation symbol. The method includes, for at least one OFDM block: a phase of prebuilding M prebuilt complex time samples representative of the N carriers of the OFDM block, and a phase of correcting the constellation symbols modulating the N carriers, including the following acts, repeated for each carrier: detection of P samples having a power higher than a predefined threshold, delivering the P samples and M-P zero samples, forming M complex time samples to be corrected, correcting the constellation symbol on the basis of the M complex time samples to be corrected, delivering an item of complex correction data, building M complex time samples associated with the item of complex correction data, and updating the M prebuilt complex time samples. |
| 主权项 |
1. A method for transmitting a multi-carrier signal representing a source signal comprising blocks each constituted by N carriers, called OFDM blocks, each carrier being modulated by a constellation symbol and being identified by an index n, n being an integer such that 0≦n≦N−1, wherein the method comprises the following acts for at least one OFDM block:
an act of pre-processing implemented in the frequency domain comprising:
a phase of pre-building complex time samples delivering M pre-built complex time samples representing N carriers of said OFDM block, M being an integer, anda phase of correcting constellation symbols that modulate the carriers of said OFDM block, said phase of correcting delivering a corrected OFDM block and comprising the following acts, repeated for each carrier:
detecting P samples, P being an integer, from among said M pre-built complex time samples coming from said phase of pre-building when n=0, or from among M complex time samples coming from an act for updating implemented for a previous carrier when 0<n≦N−1, having power above a predetermined threshold, said act for detecting delivering P samples and M-P zero samples, constituting M complex time samples to be corrected,correcting the constellation symbol modulating said carrier according to said M complex time samples to be corrected, delivering a piece of complex correction data for correcting said constellation symbol,building M complex time samples associated with said piece of complex correction data,updating said M pre-built complex time samples, said updating implementing an accumulation associating, in sets of two, said M complex time samples associated with said piece of complex correction data, with said M pre-built complex time samples coming from said pre-building phase when n=0 or with said M complex time samples coming from an updating phase implemented for a previous carrier when 0<n≦N−1, delivering M complex time samples used for the following carrier: an act of modulation implementing a transformation, from the frequency domain to the time domain, of a signal comprising at least said corrected OFDM block, coming from said phase of correcting said pre-processing act; an act of transmission and/or storage of a signal coming from said act of modulation. |
