Wireless communication network with extended coverage range

H - Electricity – 03 – D

Patent

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H03D 1/00 (2006.01)

Patent

CA 2611775

A wireless communication network supports 802.11b/g and a range extension mode, which supports at least one data rate lower than the lowest data rate in 802.11b/g. A transmitting station (which may be an access point or a user terminal) includes first and second processors. The first processor performs differential modulation and spectral spreading for a first set of at least one data rate (e.g., 1 and 2 Mbps) supported by 802.11b/g. The second processor performs forward error correction (FEC) encoding, symbol mapping, and spectral spreading for a second set of at least one data rate (e.g., 250, 500, and 1000 Kbps) supported by the range extension mode. The transmitting station can send a transmission at a data rate supported by either 802.11b/g or the range extension mode, e.g., depending on the desired coverage range for the transmission. A receiving station performs the complementary processing to recover the transmission.

L'invention concerne un réseau de communication sans fil compatible 802.11b/g ainsi qu'un mode d'amplification compatible avec au moins un débit binaire inférieur au débit binaire le plus faible de la norme 802.11b/g. Une station émettrice (pouvant être un point d'accès ou un terminal d'utilisateur) comprend des premier et second processeurs. Le premier processeur applique une modulation différentielle ainsi qu'un étalement spectral à un premier ensemble d'au moins un débit binaire (par exemple, 1 et 2 Mbps) compatible 802.11b/g. Le second processeur applique un codage de correction d'erreurs sans circuit de retour (FEC), un mappage de symboles ainsi qu'un étalement spectral à un second ensemble d'au moins un débit binaire (par exemple, 250, 500, et 1000 Kbps) compatible avec le mode d'amplification. La station émettrice peut transmettre avec un débit binaire compatible soit avec 802.11b/g soit avec le mode d'amplification, par exemple, conformément à la plage de couverture souhaitée pour la transmission. Une station réceptrice applique le traitement complémentaire pour relancer la transmission.

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