#### yeahboy

##### Newbie level 6

the same size: 100 bytes.

(a) Draw a two-dimensional graph that (approximately) indicates the region in which the frame error rate of communication with access point is at least 10%.

(b) Suppose the mobile decides to switch from one access point to another whenever the signal from the newer access point is at least 25% stronger than from the first one. Draw a two dimensional graph that indicates the points at which a mobile will switch from AP1 to AP2.

(c) Repeat part (b) for the case when the mobile decides to switch whenever the signal from the newer access point is at least 25% stronger than from the first one and the frame error rate for communication with the new access point is at most 10%. An approximate curve will suffice.

You may adopt a free-space loss model for idealized isotropic antenna (ignoring gains) and may use the following formula for the Bit-Error-Rate (BER) of BPSK modulation

(To calculate the above numerically, you can use the complement of the error function used in statistical analysis { e.g., the ERFC function in Excel.)[/img]