Apparatus and method for assigning subchannels in an ofdma...

H - Electricity – 04 – L

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H04L 27/26 (2006.01)

Patent

CA 2540889

A wireless communication system that divides an entire frequency band into a plurality of subcarrier bands and includes a plurality of subchannels, each of which includes a number of subcarrier bands. The number of subcarrier groups is equal to the number of the base stations included in the system and are generated by classifying the subcarrier bands in a period. For a particular base station, corresponding subcarrier bands are detected from each of the groups according to a sequence. The subcarrier bands detected from each of the groups are assigned as a subchannel for the particular base station. Further, the indexes of the subcarrier groups to which each of subcarriers constituting a subchannel belongs are changed whenever the subchannel is assigned, so as to acquire the desired diversity gain.

Cette invention se rapporte à un système de communication sans fil qui divise une bande de fréquence entière en plusieurs bandes de sous-porteuses et qui comprend plusieurs sous-canaux, contenant chacun un certain nombre de bandes de sous-porteuses. Le nombre des groupes de sous-porteuses est égal au nombre des stations de base incluses dans le système et ces sous-porteuses sont produites par classement des bandes de sous-porteuses dans une période. Pour une station de base particulière, des bandes de sous-porteuses correspondantes sont détectées à partir de chacun des groupes selon une séquence. Les bandes de sous-porteuses détectées à partir de chacun des groupes sont attribuées sous la forme d'un sous-canal à la station de base particulière. En outre, les index des groupes de sous-porteuses auxquels appartient chacune des sous-porteuses constituant un sous-canal sont modifiés chaque fois que le sous-canal est attribué, pour permettre l'acquisition du gain de diversité souhaité.

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