For the TDMA frame of Figure 9.13, assume the following parameters. The frame length is 2 ms. Data are encoded using OPSK with a signal element rate of 60.136 Mbaud. All traffic bursts are of equal length of 16,512 bits The reference burst has length 576 bits, the preamble is 560 bits, and the guard interval is 24 bits. Assume that there are two partici- pating reference stations, so that two reference bursts are required. a. Determine the maximum number of earth stations the system can serve. b. What is the frame efficiency (fraction of frame carrying user data rather than overhead bits)? Frame period Station 1Statio 2Station 3 N-1 Guard time Carrier and Coordina bit timingtion data recovery Reference borst Station data burst Preamble Information Carrier andStationNetwork control, bit timing Unique recovery word dentiiNetwork co requests cation Figure 9.13 Example of TDMA Frame Format For the TDMA frame of Figure 9.13, assume the following parameters. The frame length is 2 ms. Data are encoded using OPSK with a signal element rate of 60.136 Mbaud. All traffic bursts are of equal length of 16,512 bits The reference burst has length 576 bits, the preamble is 560 bits, and the guard interval is 24 bits. Assume that there are two partici- pating reference stations, so that two reference bursts are required. a. Determine the maximum number of earth stations the system can serve. b. What is the frame efficiency (fraction of frame carrying user data rather than overhead bits)? Frame period Station 1Statio 2Station 3 N-1 Guard time Carrier and Coordina bit timingtion data recovery Reference borst Station data burst Preamble Information Carrier andStationNetwork control, bit timing Unique recovery word dentiiNetwork co requests cation Figure 9.13 Example of TDMA Frame Format