Apparatus, and associated method, for communicating a data...

H - Electricity – 04 – J

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H04J 11/00 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2676385

Apparatus, and an associated method, for sending a data block in an OFDM, or other MCM, communication system with reduced PAPR is provided. The data block is combined with a random scrambling sequence. An IDFT operation is performed upon the combined sequence, and its PAPR, peak-to-average power ratio, is calculated. The PAPR is compared against a threshold. If the PAPR is smaller than a threshold, the transformed, combination sequence is transmitted. Otherwise, a different scrambling sequence, if available, is used to form a new combination sequence, and the process iterates until either a PAPR smaller than the threshold is obtained, or a pre-defined maximum number of iterations is reached. If the maximum number of iterations is reached and no combination sequence is created that leads to an acceptable PAPR, then the transformed, combination sequence that exhibits the smallest PAPR level is selected for transmission.

La présente invention concerne un appareil et un procédé associé d'envoi de bloc de données dans un système de communication OFDM, ou autre MCM, à PAPR réduit. On combine le bloc de données à une séquence d'embrouillage aléatoire. On prend la séquence combinée et on la soumet à une transformée de Fourier discrète inverse, puis en en calcule le rapport "valeur de crête / valeur moyenne" de la puissance, rapport que l'on compare à un seuil. Si ce rapport est inférieur au seuil, on transmet la séquence combinée transformée. Sinon, on utilise une séquence d'embrouillage différente, si on en dispose, pour former une nouvelle séquence combinée, et on recommence le traitement jusqu'à obtenir un rapport "valeur de crête / valeur moyenne" de la puissance inférieur au seuil ou jusqu'à atteindre un nombre maximum prédéfini d'itérations. Si on atteint le nombre maximum d'itérations sans création de séquence combinée aboutissant à un rapport acceptable, on prend pour transmission la séquence combinée transformée dont le rapport est le plus petit.

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