Impairment determination for a diversity antenna selection...

H - Electricity – 04 – B

Patent

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H04B 7/08 (2006.01)

Patent

CA 2219228

A diversity selection process which tests to determine whether poor reception is caused by co-channel interference or multipath fading is disclosed. The impairment is determined by first testing the quality over several frames. Unless the quality is poor over these several frames, the system tests for multipath fading by selecting the antenna with the greater signal strength, provided no hold condition exists. However, if poor quality has been present over the several frame period, the system selects the other antenna if its RSSI is greater. However, the system also tests the RSSI received on the current antenna and determines the impairment was co-channel interference if the signal of quality was sufficiently high. In which case a hold condition is set for a number of frames to prevent excessive switching.

Processus de sélection en diversité permettant de déterminer par des tests si une mauvaise qualité de réception est due au brouillage dans le même canal ou à l'évanouissement par trajets multiples. Premièrement, des tests sont faits sur plusieurs trames pour déterminer la dégradation. € moins que la qualité soit mauvaise sur ces différentes trames, le système teste ensuite l'évanouissement par trajets multiples en choisissant l'antenne ayant la plus grande intensité de signal, s'il n'y a pas d'états de maintien. Toutefois, si une mauvaise qualité a été décelée sur les différentes périodes de trame, le système choisit l'autre antenne si son RSSI est supérieur. Toutefois, le système teste également le RSSI sur l'antenne en usage et attribue la dégradation au brouillage dans le même canal si le signal de qualité est assez élevé, auquel cas un état de maintien est établi pour un certain nombre de trames afin d'empêcher une commutation excessive.

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