a cellular system uses fdma with a spectrum allocation of 12:5mhz. a guard band
ID: 2990043 • Letter: A
Question
a cellular system uses fdma with a spectrum allocation of 12:5mhz. a guard band of 10khz at both edges of the allocated spectrum is enabled to avoid interfering with other systems/service providers. each frequency channel has a bandwidth of 30khz. (a) what is the total number of available frequency channels? (b) suppose that each channel is equally shared by 8 users using tdma and that each user has a receive signal-to-interference-plus-noise ratio (sinr) of 255. what is the maximum transmission rate of each user?
Explanation / Answer
Please rate:
a) Total bandwidth = 12.5 x 2 M Hz
Guard band = 10 x 2 k Hz
Therefore, Number of Duplex Channels= (12.5x2 M Hz-10x2 kHz)/30*2 kHz = 208
Or, 416 simplex channels
b)
Total bandwidth of rach frequency channel=30*2=60 KHz
Total users for each channel=8
Bandwidth for each user=60kHz/8=7.5 kHz
SINR=255
Maximum transmission rate of each user=Blog2(1+255)
=7.5 kHz*8
= 60 kbits/sec
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.