On multiple Access, assuming user 1's signal represented by A, user2's by B and user3's by...
On multiple Access, assuming user 1's signal represented by A, user2's by B and user3's by C. Select 3 orthogonal codes with length of 8 to illustrate how CDMA ( Code Division Multiple Access ) works ?
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On multiple Access, assuming user 1's signal represented by A,
user2's by B and user3's by...
Consider the following chip sequences for a Code Division Multiple Access (CDMA) with chip length m...
Consider the following chip sequences for a Code Division Multiple Access (CDMA) with chip length m = 4. Do these sequences meet the requirement of CDMA? A: +1 +1 -1 -1 B: -1 -1 +1 +1
Consider three hosts A, B, and C using Code Division Multiple Access (CDMA) with chip length...
Consider three hosts A, B, and C using Code Division Multiple Access (CDMA) with chip length m = 4. Their chips are the following: A: +1 - 1 +1 -1; B: +1 +1 - 1 -1; C: +1 - 1 - 1 + 1 Show the resulting signal S when C transmits a 1 and B transmits a 0. Discuss and show how we can infer from S that A did not transmit. Please include details and explanations. I'm aware...
(c) Consider a Frequency Hoping (FH) binary orthogonal FSK system carrying speech signal with a cut-off...
(c) Consider a Frequency Hoping (FH) binary orthogonal FSK system carrying speech signal with a cut-off frequency of 3.4 kHz for transmission after undergoing analog- digital conversion process. The following chip sequences for 4 code-division multiple access (CDMA) transmitters are given: A: (-1-1 -1 +1 +1 -1+1+1) B:(-1-1 +1 -1 +1 +1+1-1) C: (-1 +1 -1 +1 +1 +1-1-1) D: (-1 +1 -1-1-1-1+1-1) Assuming A, B and C are simultaneously sending 0, determine the resulting chip sequence in the channel?...
Draw a diagram and briefly explain the multiple access techniques, (1) Frequency Division Multiple Access (2)...
Draw a diagram and briefly explain the multiple access techniques, (1) Frequency Division Multiple Access (2) Time Division Multiple Access (3) Code Division Multiple Access Subject: Mobile Communications Engineering
Problem 6 a) State two approaches of avoiding collision in a carrier sense multiple access with...
Problem 6 a) State two approaches of avoiding collision in a carrier sense multiple access with collision avoidance based network. Give two reasons why collisions cannot be eliminated in a network whose nodes perform carrier sensing prior to transmitting a packet b) For the slotted ALOHA protocol used on the random access channel in cellular systems, show that the theoretical maximum throughput, Smax = '36%. Hint: For slotted ALOHA, the throughput S is given by: S=Ge-, where G is the...
Question 27 (1 point) Which of the following is not correct for Frequency Division Multiple Access...
Question 27 (1 point) Which of the following is not correct for Frequency Division Multiple Access FDMA? Each FDMA user is assigned a sub-channel If the number of users is less than the number of sub-channels, spectrum resource is wasted OFDMA requires synchronization OFDMA requires guard bands Multiple Selection Question 28 (2 points) Select correct statements about CSMA/CA Frame size must be 2 minimum size, which is a property of the network Before transmitting a frame, a station need make...
(a) Distinguish between simplex, half-duplex, and duplex links in a computer network. (b) Disting...
(a) Distinguish between simplex, half-duplex, and duplex links in a computer network. (b) Distinguish between three multiple access mechanisms used in present day wireless networks (1 (1 Marks) Marks) 3. (c) Two users like to communicate their 4-bit messages 1011 and 1110 to the cell tower by spreading their messages using the orthogonal Walsh codes 1111 and 1010, respectively. Verify the mutual orthogonality of these Walsh codes using the property that their exclusive OR sum contains number of 1s and...
If the volts/division is set at 0.5, the largest signal that can fit on an oscilloscope...
If the volts/division is set at 0.5, the largest signal that can fit on an oscilloscope display screen (assuming an 8 horizontal x 10 vertical division screen) is: a. 62.5 millivolts peak-to-peak. b. 8 volts peak-to-peak. c. 5 volts peak-to-peak. d. 0.5 volts peak-to-peak. If the seconds/division is set at 0.1 ms, the amount of time represented by the width of the screen (assuming an 8 horizontal x 10 vertical division screen) is: a. 0.1 ms b. 0.8 ms c....
below is a direct sequence code division multiple access Q1 A LTE system employs orthogonal frequency division mult...
below is a direct sequence code division multiple access
Q1 A LTE system employs orthogonal frequency division multiple30 access (OFDMA) transmission for downlink transmission, in which users are allocated a specific number of subcarriers for a predetermined amount of time, referred to as physical resource blocks (PRBs) in the LTE specifications. A PRB is defined as consisting of 12 consecutive subcarriers for one slot in duration. Given that the subcarrier spacing is 15 KHz, and transmission bandwidth over a 2.7GHz...
Given a signal g(t) = 20 cos(140πt): a. Calculate the signal bandwidth. b. Can the Signal...
Given a signal g(t) = 20 cos(140πt): a. Calculate the signal bandwidth. b. Can the Signal be recovered if sampled at a rate (fs) of 200 samples per second? Justify your answer mathematically. c. With fs = 200 samples per sec and quantization levels (L) = 8, calculate the first 3 samples, first 3 quantized samples, and the binary codes of the first 3 samples. Assume sampling starts at t=0 and natural binary code is used.
(c) Consider a Frequency Hoping (FH) binary orthogonal FSK system carrying speech signal with a cut-off frequency of 3.4 kHz for transmission after undergoing analog- digital conversion process. The following chip sequences for 4 code-division multiple access (CDMA) transmitters are given: A: (-1-1 -1 +1 +1 -1+1+1) B:(-1-1 +1 -1 +1 +1+1-1) C: (-1 +1 -1 +1 +1 +1-1-1) D: (-1 +1 -1-1-1-1+1-1) Assuming A, B and C are simultaneously sending 0, determine the resulting chip sequence in the channel?...
Problem 6 a) State two approaches of avoiding collision in a carrier sense multiple access with collision avoidance based network. Give two reasons why collisions cannot be eliminated in a network whose nodes perform carrier sensing prior to transmitting a packet b) For the slotted ALOHA protocol used on the random access channel in cellular systems, show that the theoretical maximum throughput, Smax = '36%. Hint: For slotted ALOHA, the throughput S is given by: S=Ge-, where G is the...
Question 27 (1 point) Which of the following is not correct for Frequency Division Multiple Access FDMA? Each FDMA user is assigned a sub-channel If the number of users is less than the number of sub-channels, spectrum resource is wasted OFDMA requires synchronization OFDMA requires guard bands Multiple Selection Question 28 (2 points) Select correct statements about CSMA/CA Frame size must be 2 minimum size, which is a property of the network Before transmitting a frame, a station need make...
(a) Distinguish between simplex, half-duplex, and duplex links in a computer network. (b) Distinguish between three multiple access mechanisms used in present day wireless networks (1 (1 Marks) Marks) 3. (c) Two users like to communicate their 4-bit messages 1011 and 1110 to the cell tower by spreading their messages using the orthogonal Walsh codes 1111 and 1010, respectively. Verify the mutual orthogonality of these Walsh codes using the property that their exclusive OR sum contains number of 1s and...
below is a direct sequence code division multiple access
Q1 A LTE system employs orthogonal frequency division multiple30 access (OFDMA) transmission for downlink transmission, in which users are allocated a specific number of subcarriers for a predetermined amount of time, referred to as physical resource blocks (PRBs) in the LTE specifications. A PRB is defined as consisting of 12 consecutive subcarriers for one slot in duration. Given that the subcarrier spacing is 15 KHz, and transmission bandwidth over a 2.7GHz...
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