A metropolitan area is to be given wireless digital telephone service. Throughout this area there is...
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A metropolitan area is to be given wireless digital telephone service. Throughout this area there is approximately uniform service demand. Assume that the frequency is allocated in two blocks of 4 MHz with a separation of 50 MHz, one block for the uplink and the other for the downlink, which constitutes a frequency-division duplex (FDD) operation. The system uses the hybrid frequency- division/time-division multiple access (FD/TDMA) scheme as follows: The frequency band is divided into 500 kHz "channels" (which is the frequency division part), and on each of those "channels" a total 40 high-quality digital voice circuits are multiplexed in a TDMA manner. a) Draw the time-frequency plane and partition that plane appropriately for this FDD FD/TDMA system. b) The modulation scheme used is 8-QAM which is implemented with the square-root- raised cosine pulses with a roll-off factor, a of 0.25. Find the bit rate for each user. W Hint: Rs = /1+ a where R, is the rate and w is the bandwidth A metropolitan area is to be given wireless digital telephone service. Throughout this area there is approximately uniform service demand. Assume that the frequency is allocated in two blocks of 4 MHz with a separation of 50 MHz, one block for the uplink and the other for the downlink, which constitutes a frequency-division duplex (FDD) operation. The system uses the hybrid frequency- division/time-division multiple access (FD/TDMA) scheme as follows: The frequency band is divided into 500 kHz "channels" (which is the frequency division part), and on each of those "channels" a total 40 high-quality digital voice circuits are multiplexed in a TDMA manner. a) Draw the time-frequency plane and partition that plane appropriately for this FDD FD/TDMA system. b) The modulation scheme used is 8-QAM which is implemented with the square-root- raised cosine pulses with a roll-off factor, a of 0.25. Find the bit rate for each user. W Hint: Rs = /1+ a where R, is the rate and w is the bandwidth
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Answer rating: 100% (QA)
ANSWER A FDD Frequency Division Duplex is a technique in mobile networks that uses separate frequency bands for uplink and downlink communication TDD ... View the full answer
Related Book For
Mathematical Applications for the Management Life and Social Sciences
ISBN: 978-1305108042
11th edition
Authors: Ronald J. Harshbarger, James J. Reynolds
Posted Date:
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