摘要:
The method comprises suppressing (30) in each symbol the sub-carriers corresponding to the part of said transmission band to be notched, and suppressing (31) in each symbol a chosen part of the remaining sub-carriers to be modulated.
摘要:
Le signal incident impulsionnel du type à bande ultra large véhicule des informations numériques codées en utilisant des impulsions de forme théorique connue. Le dispositif de décodage comprend des moyens d'entrée ANT pour recevoir le signal incident et délivrer un signal de base, des moyens de prétraitement CMP recevant le signal de base et aptes à délivrer un signal intermédiaire représentatif du signe du signal de base par rapport à une référence, des moyens d'échantillonnage MECH du signal intermédiaire aptes à délivrer un signal numérique, et des moyens numériques MTN de traitement comportant des moyens de synchronisation et des moyens de décodage MDCD aptes à effectuer une corrélation du signal numérique avec un signal de corrélation de référence correspondant à un signal de base théorique issu de la réception d'une impulsion théorique ayant ladite forme théorique connue.
摘要:
The incident signal contains a preamble including a training sequence having a series of pulses whose polarity and time shifts are defined by respective polarity code and time-hopping code. The method comprises a digital cross-correlation of the received signal with said training sequence, said cross-correlation step (101) including algebraically summing in accordance with said polarity code (a j ), windows of said received signal, the starting points of said windows being determined by said time-hopping code (c j ), and a detection step for detecting the end point (n synchro ) of the preamble from the result of said cross-correlation step. When the size of the receiving buffer, i.e. the size of the window is smaller than the number N of samples of each replica of the training sequence, it is particularly advantageous that said digital cross-correlation step be performed iteratively in a block-by-block fashion, the computation of each block being split into M slices which are computed by algebraically summing windows N/M samples long.
摘要:
The calibration is performed tone per tone during interframe spacing. A peak detection is used for measuring (42) the level of the corresponding signal and a gain correction coefficient (GCCFi) is stored for correcting the digital complex modulation coefficients provided by the mapping means.
摘要:
The method of notching the transmission band of an analog signal to be transmitted and including sub-carriers to be modulated from digital modulation coefficients respectively associated to said sub-carriers, said method comprises providing (30) an initial digital signal from successive frequency-domain groups each containing said digital modulation coefficients respectively associated to said sub-carriers, filtering (31) said initial signal with a frequency resolution greater than the frequency resolution of said frequency-domain groups in order to remove frequencies corresponding to said sub-carriers to be removed and windowing (32) said filtered signal using a windowing mask (WMSK) having a representation in the frequency-domain including a main lobe and secondary lobes, the power spectrum of said lobes decreasing faster than the inverse of the frequency squared.