If the vehicle speed is 180 km/hrat 900 MHz, a) What is the coherence time (for...
If the vehicle speed is 180 km/hrat 900 MHz, a) What is the coherence time (for correlation of 0.5)? b) What is the corresponding minimum symbol rate for no significant distortion
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If the vehicle speed is 180 km/hrat 900 MHz, a) What is the
coherence time (for...
1) a) What is the maximum Doppler for a vehicle speed of 140 km/hr at 900...
1) a) What is the maximum Doppler for a vehicle speed of 140 km/hr at 900 MHz? b) What is the minimum (most negative) Doppler for this case? c) For this range of Doppler, what is the corresponding speed at 1800 MHz? 2) What is the probability that a Rayleigh faded signal is at least 15 dB lower than its mean power? 3) a) If a vehicle is moving at 140 km/hr and using a 900 MHz carrier, how long...
8.9 An automobile with four wheels is about to pass over a speed bump as shown in the insert in Eigure 8.35a. The velocity of the vehicle at that time is 10 km/h. The vehicle is supported by a suspen...
8.9 An automobile with four wheels is about to pass over a speed bump as shown in the insert in Eigure 8.35a. The velocity of the vehicle at that time is 10 km/h. The vehicle is supported by a suspension system that consists of one coilover per wheel (a coilover is a combination of a shock absorber, or a damper, enclosed by a coil spring). The analytical model of the suspension system is illustrated in Figure 8.35b. The mass of...
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...
5.1 Determine the maximum and minimum spectral frequencies received from a stationary GSM transmitter that has...
5.1 Determine the maximum and minimum spectral frequencies received from a stationary GSM transmitter that has a center frequency of exactly 1950.000000 MHz, assuming that the receiver is traveling at speeds of: (a) 1 km/hr; (b) 5 km/hr; (C) 100 km/hr; and (d) 1000 km/hr. 5.5 Given that the coherence bandwidth is approximated by Equation (5-39), show that a flat fading channel occurs when T, 2 10 04. Hint: Note that B is an RF bandwidth, and assume that Ts...
An airplane maintains a heading due west at an air speed of 900 km/h. It is...
An airplane maintains a heading due west at an air speed of 900 km/h. It is flying through a hurricane with winds of 300 km/h, from the northeast. (a) (b) In which direction is the plane moving relative to the ground? What is the plane's ground speed?
Assume a propagation speed of 200 km/hour. a. Suppose the caravan travels 180 km, beginning in...
Assume a propagation speed of 200 km/hour. a. Suppose the caravan travels 180 km, beginning in front of one tollbooth, passing through a second tollbooth, and finishing just after a third tollbooth. What is the end-to-end delay? b. Repeat (a), now assuming that there are twelve cars in the caravan instead of ten.
A driver operating a vehicle at a speed of 25.0 m/s intends to pass a second...
A driver operating a vehicle at a speed of 25.0 m/s intends to pass a second vehicle 2.00 km ahead traveling in the same direction with a speed of 30.0 m/s. The driver of the first vehicle accelerates at a uniform rate to pass the second vehicle, and does so after traveling 4.00 km. Thus, whereas the first (rear) vehicle traverses 4.00 km, the second (front) car only travels 2.00 km, when it is passed. If the driver of the...
A VHF radar at 220 MHz has a maximum unambiguous range of 180 nmi. (a) What...
A VHF radar at 220 MHz has a maximum unambiguous range of 180 nmi. (a) What is its first blind speed (in knots)? (b) Repeat, but for an L-band radar at 1250 MHz. (c) Repeat, but for an X-band radar at 9375 MHz. (d) What would be the unambiguous range (nmi) of the X-band radar of part (c) in order to give the same blind speed you found in part (a) for the VHF radar? (e) If you needed to...
The average speed of a vehicle on a stretch of Route 134 between 6 A.M. and...
The average speed of a vehicle on a stretch of Route 134 between 6 A.M. and 10 A.M. on a typical weekday is approximated by the function f(t) = 13t − 26 t + 36 (0 ≤ t ≤ 4) where f (t) is measured in miles per hour, and t is measured in hours, with t = 0 corresponding to 6 A.M. At what time of the morning commute is the traffic moving at the slowest rate? A.M. What...
The speed limit in a school zone is 45 km/h. A driver traveling at this speed...
The speed limit in a school zone is 45 km/h. A driver traveling at this speed sees a child run onto the road 20 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 11.0 m/s2. If the driver's reaction time is 0.55 s, will the car stop before hitting the child?What is the stopping distance of the vehicle?
8.9 An automobile with four wheels is about to pass over a speed bump as shown in the insert in Eigure 8.35a. The velocity of the vehicle at that time is 10 km/h. The vehicle is supported by a suspension system that consists of one coilover per wheel (a coilover is a combination of a shock absorber, or a damper, enclosed by a coil spring). The analytical model of the suspension system is illustrated in Figure 8.35b. The mass of...
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...
5.1 Determine the maximum and minimum spectral frequencies received from a stationary GSM transmitter that has a center frequency of exactly 1950.000000 MHz, assuming that the receiver is traveling at speeds of: (a) 1 km/hr; (b) 5 km/hr; (C) 100 km/hr; and (d) 1000 km/hr. 5.5 Given that the coherence bandwidth is approximated by Equation (5-39), show that a flat fading channel occurs when T, 2 10 04. Hint: Note that B is an RF bandwidth, and assume that Ts...
An airplane maintains a heading due west at an air speed of 900 km/h. It is flying through a hurricane with winds of 300 km/h, from the northeast. (a) (b) In which direction is the plane moving relative to the ground? What is the plane's ground speed?
A driver operating a vehicle at a speed of 25.0 m/s intends to pass a second vehicle 2.00 km ahead traveling in the same direction with a speed of 30.0 m/s. The driver of the first vehicle accelerates at a uniform rate to pass the second vehicle, and does so after traveling 4.00 km. Thus, whereas the first (rear) vehicle traverses 4.00 km, the second (front) car only travels 2.00 km, when it is passed. If the driver of the...
A VHF radar at 220 MHz has a maximum unambiguous range of 180 nmi. (a) What is its first blind speed (in knots)? (b) Repeat, but for an L-band radar at 1250 MHz. (c) Repeat, but for an X-band radar at 9375 MHz. (d) What would be the unambiguous range (nmi) of the X-band radar of part (c) in order to give the same blind speed you found in part (a) for the VHF radar? (e) If you needed to...
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