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A weighted sum of the photocurrents emanating from N photodetectors would then give the received electrical signal. The SNR obtained by this technique is given by [11]: N SN R = i=1 2 R2 PRX,j σi2 (1) where R is the detector responsivity; PRX,i and σi are the respective average detected signal and noise power at the ith photodetector. Assuming that the incoming beam subtends an angle φ with respect photodetector surface normal and if this angle is less than the reciever acceptance angle φa then the received signal power is A PRX,i = IT X e−αL 2 TF TC,φ Fφ,i cos φ .
In other words, there is a bidirectional link between A 1 TORA includes a recovery technique, but it is based on link reversal and therefore it is not applicable in networks with unidirectional links 26 Ionut¸ D. S. Gupta and W and between W and B or W and C. Hence, W can help bypass the link A → B (and possibly the link B → C) in the original route, replacing it with the sub-path A → W → B (or with A → W → C respectively). Active witnesses of host A are entitled to act on A’s behalf for routing purposes.
An interesting and important aspect of mobile computing in multiple cell environments is roaming. In order to facilitate wireless roaming, base stations have to negotiate with each other to ensure continuous service to a user moving across cells. Whenever a mobile user moves into a new cell, his mobile computer registers with the base station in charge of that cell. This registration process usually involves communication between the old base station and the new base station to hand-off information associated with the mobile user and computer.