Tema 2: Factores que Afectan la Transmisión. Profesora Maria Elena Villapol [email protected] Factores que afectan la transmisi ó n LOS. Atenuaci ó n y distorsi ó n de atenuaci ó n P é rdida en el espacio libre ( Free space loss ) Ruido Absorci ó n atmosf é rica
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d y tienen las mismas unidades (e.g., metros)
- Consiste en proporcionar múltiples canales lógicos entre el transmisor y el receptor y enviar la señal sobre cada canal.
S = Ga – Pna + Gaa – Pp + Gab – Pnb –Pcb.
The Swedish Space Corporation (SSC) announced 12 December 2002 that they have transmitted information via a broadband wireless link over a distance of 310km. They believe that this is the longest distance achieved using wireless connectivity.
The link was made between a stratospheric balloon that was launched from Esrange near the town of Kiruna in northern Sweden and a base station located near Esrange. Onboard the balloon was a 2.4 meters antenna and radio supplied by Alvarion, with a 6 watts power amplifier, a camera and a server. Automatic tracking of the antenna using GPS technology was employed.
The information between the balloon and the base station was transmitted over the 2.4GHz spectrum with a stable signal strength of -68 dBm. The round trip ping response at 300 km was 300-500 ms