Erlang

(See attached files for full problem descriptions)

Propagation Fundamentals- Cellular Systems

1. A cell is located over smooth, flat terrain. The system operates in the 1900 MHz band and the base station antenna is located 15 m above the ground. The mobile terminal is 250 m away from the base and its antenna is 1.5 m above the ground. (Use 1920 MHz in your computations.) (a) Compute the propagation loss. (b) What is the free space propagation loss? Does it apply here? (c) Plot the propagation loss from 250 to 400 m. How many dB does it vary by over this range? (d) Approximately how "smooth" does the terrain have to be for these computations to be valid? 2. In the cell of problem 1, there is one building located 125 m from the base. (a) Approximately what building heig... click for more

Multipath and Fading

(See attached file for full problem description) --- 1. The GSM system uses a 4.615 ms frame partitioned into 8 slots as shown below. A mobile user is traveling on a high-speed train at 200 km/hr and operating at a frequency of 900 MHz. ---------------------------------------- 4.615 ms ---------------------------------- 0 1 2 3 4 5 6 7 (a) What is the maximum Doppler, fd? (b) What is the coherence time, Tcoh? (c) Will a measurement of the channel path loss made in slot 0 of the current frame be useful in the next frame? (d) Will the channel path loss change significantly during a slot? 2. A mobile link that exhibits Rayleigh fading can tolerate a 9-dB fade (relat... click for more

IS-95

(See attached file for full problem descriptions)

Impulse response

Two discrete time systems are connected in series. Their input-output difference equations are: T1[.]: w[k] = 0.25x[k-2] and T2[.]: y[k] = 0.5w[k-1] + 0.5w[k-2] Determine the overall input-output difference equation relating y[k] to x [k] and determine the impulse response of the overall system using convolution.