[Solved]Q2 Pure Aloha Network 100 Stations Transmission Time 1 S Number Frames S Station Send Achi Q37127633

Q2. (a) (i) We have a pure ALOHA network with 100 stations. If the transmission time is 1 μs, what is the number of frames/s each station can send to achieve the maximum efficiency? Repeat this exercise for slotted ALOHA. [6 marks] (ii One hundred stations on a pure ALOHA network share a l-Mbps channel. If frames are 1000 bits long, find the throughput if each station is sending 10 frames per second. Repeat this exercise for slotted ALOHA. [4 marks] (b) A (15,7) Hamming codeword is sent over a channel with a bit error rate of 6 x 102. Calculate the probability of 3 or more errors occurring in any codeword. [4 Marks] (c) Most TCP algorithms assume that timeouts are caused by congestion. Why is this a problem when transmitting TCP connections over wireless channels? [4 Marks] (d) We consider a cellular network with a transmit power of 1.5W. The transmit and receive antenna gains are equal to 2.5, while the operating carrier frequency is 6 GHz. If the receiver bandwidth is 30KHz and the noise figure is 8 (linear scale), determine the maximum distance to support a SNR of 10dB (Hint: Assume free-space propagation, no error losses and that the reference distance is 1km) [9 Marks] Show transcribed image text Q2. (a) (i) We have a pure ALOHA network with 100 stations. If the transmission time is 1 μs, what is the number of frames/s each station can send to achieve the maximum efficiency? Repeat this exercise for slotted ALOHA. [6 marks] (ii One hundred stations on a pure ALOHA network share a l-Mbps channel. If frames are 1000 bits long, find the throughput if each station is sending 10 frames per second. Repeat this exercise for slotted ALOHA. [4 marks] (b) A (15,7) Hamming codeword is sent over a channel with a bit error rate of 6 x 102. Calculate the probability of 3 or more errors occurring in any codeword. [4 Marks] (c) Most TCP algorithms assume that timeouts are caused by congestion. Why is this a problem when transmitting TCP connections over wireless channels? [4 Marks] (d) We consider a cellular network with a transmit power of 1.5W. The transmit and receive antenna gains are equal to 2.5, while the operating carrier frequency is 6 GHz. If the receiver bandwidth is 30KHz and the noise figure is 8 (linear scale), determine the maximum distance to support a SNR of 10dB (Hint: Assume free-space propagation, no error losses and that the reference distance is 1km) [9 Marks]

Expert Answer

---

Answer to Q2. (a) (i) We have a pure ALOHA network with 100 stations. If the transmission time is 1 μs, what is the number of fra… . . .