The distance between cell centers with the same frequency band is required to be more than 6 km. What is the cell radius for the cluster size of 12.
Q2.
Using the NxSxK notation, label the frequency re-use patterns below:
(a)
(b)
(c)
(d)
Q3.
Consider a cluster size of 7 for fractional frequency re-use in hexagonal cellular networks. Assume that each cell is allocated an identical set of 7 frequencies, F1 to F7, to be used within the cell. Draw a cluster of 7 cells showing the frequency use in the centers and borders of the cells.
Q4.
A particular cellular system has the following characteristics: cluster size =9, uniform cell size, user density=100 users/sq km, allocated frequency spectrum = 900-945 MHz, bit rate required per user = 10 kbps uplink and 10 kbps downlink, and modulation code rate = 2 bps/Hz. Answer the following questions.
(a) Using FDMA/FDD:
1. How much bandwidth is available per cell using FDD?
2. How many users per cell can be supported using FDMA?
3. What is the cell area
4. What is the cell radius assuming circular cells?
(b) If the available spectrum is divided in to 100 channels and TDMA is employed within each channel:
1. What is the bandwidth and data rate per channel?
2. How many time slots are needed in a TDMA frame to support the required number of users?
3. If the TDMA frame is 10ms, how long is each user slot in the frame?
4. How many bits are transmitted in each time slot?
