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كاتب الموضوع :
NueVo
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بنات شباب بليز بليز ابي مساعدتكم لي ,,انا تخصصي هندسة كمبيوتر لكن الكليه اللي انا فيها ماناخذ اي شي عن الوايرلس وهالبروبلم عن الوايرلس الدكتور عطانياهم وقال سألوا اي احد بجامعة ويعلمكم الحل ,,بليييز ساعدوني مالي غيركم ,,أنا سمعت عن منتداكم وتوني مشتركه فيه وهذا اول موضوع وطلب لي ,,بليز لاتردوني ,,ساعدوني لو سمحتوا بأقرب وقت ممكن,,وانا شاكره لكم
الدكتور معطينا 6 مسائل وانا كتبت لكم 3 مسائل
1) Atotal of 24 MHz of bandwidth is allocated to a particular FDD cellular telephone system that uses two 30 KHz simplex channels to provide full duplex voice and control channels.
Assume each cell phone user generates 0.1 Erlangs of traffic. Assume Erlang B is used.
a) Find the number of channels in each cell for a four-cell reuse system.
b) If each cell is to offer capacity that is 90% of perfect scheduling,find the maximum number of users that can be supported per cell where omnidirectional antennas are used at each base station.
c) What is the blocking probability of the system in (b) when the maximum number of users are available in the user pool?
d) If each new cell now uses 120 sectoring instead of omnidirectional for each base station, what is the new total number of users that can be supported per cell for the same blocking probability as in (c) ?l
e) If each cell covers five square kilometers, then how many subscribers could be supported in an urban market that is 50 km x 50 km for the case of omnidirectional base station antennas?
f) If each cell covers five square kilometers, then how many subscribers couls be supported in an urban market that is 50km x 50 km for the case of 120 sectored antennas?
2)
A certain area is covered by acellular radio system with 84 cells and a cluster size N. 300 voice channels are available for the system. Users are uniformly distributed over the area covered by the cellular system, and the offered traffic per user is 0.04 Erlang. Assume that blocked calls are cleared and the designated blocking probability is Pb=1%
a) Determine the maximum carried traffic per cell if cluster size N=4 is used. Repeat for cluster sizes N=7 and 12
b) Determine the maximum number of users that can be served by the system for a blocking probability of 1% and cluster size N=4. Repeat for cluster sizes N=7 and12
3)
Determine the noise floor ( in dBm) for mobile receivers which
implement the following stadards: (a) AMPS, (b GSM, (c USDC, (d DECT, (e IS-95, and(f CT2. Assume all receivers have a noise figure of 10dB
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