Radio telephone system for minimizing co-channel...

Details Radio telephone system for minimizing co-channel... Radio telephone system for minimizing co-channel...

H - Electricity

04

Q

H04Q 7/22 (2006.01) H04B 1/713 (2006.01) H04B 7/005 (2006.01)

Patent

CA 2156071

A system for minimizing co-channel interference between transmission sectors at their common periphery. The system exploits the geographic separation of potentially interfering mobile transmitters (12) and utilizes transmission power control. The system employs sectored antennas in a combined frequency hopping, TDMA system wherein each subscriber in a particular sector is assigned a time slot in the system based upon that subscriber's geographic location within that sector. The transmission power in the sector is reduced during certain predetermined time slots and subscribers who are remote from the fringe of the sector are assigned to these power reduced time slots. During up-link the transmission power for subscribers located proximal to the fringe are reduced to cause less co-channel interference between their signals and the signals from other subscribers in different sectors having the same time slot.

Un système permêt de minimiser les brouillages co-canal survenant à la périphérie commune de secteurs d'émission. Ce système permet d'exploiter la séparation géographique d'émetteurs (12) mobiles éventuellement brouilleurs et d'utiliser la maîtrise de la puissance d'émission. Il comporte des antennes sectorielles dans un système AMRT et à sauts de fréquences combiné où chaque utilisateur d'un secteur donné reçoit un créneau temporel propre au système inventé en fonction de sa position géographique dans ce secteur. La puissance d'émission dans ce secteur est réduite pendant certains crénaux temporels pré-déterminés qui sont attribués aux utilisateurs éloignés des bords dudit secteur. Sur la liaison montante, la puissance d'émission destinée aux utilisateurs proches du bord est réduite pour provoquer moins de brouillage co-canal entre leurs signaux et ceux d'autres utilisateurs utilisant le même créneau temporel dans d'autres secteurs.

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