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Burst-mode transmission linking two continuous-mode streams.
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This is also referred to as the burst rate, but note that this means the instantaneous bit rate within a burst (not the number of bursts per second, which is simply equal to 1/TB). It will be seen that the average bit rate for the burst mode is simply M/TF, which is equal to the input and output rates. The frame time TF will be seen to add to the overall propagation delay. For example, in the simple system illustrated in Fig. 14.11, even if the actual propagation delay between transmit and receive buffers is assumed to be zero, the receiving side would still have to wait a time TF before receiving the first transmitted burst. In a geostationary satellite system, the actual propagation delay is a significant fraction of a second, and excessive delays from other causes must be avoided. This sets an upper limit to the frame time, although with current technology other factors restrict the frame time to well below this limit. The frame period is usually chosen to be a multiple of 125 s, which is the standard sampling period used in pulse-code modulation (PCM) telephony systems, since this ensures that the PCM samples can be distributed across successive frames at the PCM sampling rate. Figure 14.12 shows some of the basic units in a TDMA ground station, which for discussion purposes is labeled earth station A. Terrestrial links coming into earth station A carry digital traffic addressed to destination stations, labeled B, C, X. It is assumed that the bit rate is the same for the digital traffic on each terrestrial link. In the units labeled terrestrial interface modules (TIMs), the incoming continuous-bit-rate signals are converted into the intermittent-burst-rate mode. These individual burst-mode signals are time-division multiplexed in the time division multiplexer (MUX) so that the traffic for each destination station appears in its assigned time slot within a burst. Certain time slots at the beginning of each burst are used to carry timing and synchronizing information. These time slots collectively are referred to as the preamble. The complete burst containing the preamble and the traffic data is used to phase modulate the radiofrequency (rf) carrier. Thus the composite burst which is transmitted at rf consists of a number of time slots, as shown in Fig. 14.13. These will be described in more detail shortly. The received signal at an earth station consists of bursts from all transmitting stations arranged in the frame format shown in Fig. 14.13. The rf carrier is converted to intermediate frequency (IF), which is then demodulated. A separate preamble detector provides timing information for transmitter and receiver along with a carrier synchronizing signal for the phase demodulator, as described in the following section. In many systems, a station receives its own transmission along with the others in the frame, which can then be used for burst-timing purposes. A reference burst is required at the beginning of each frame to provide timing information for the acquisition and synchronization of bursts
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Some of the basic equipment blocks in a TDMA system.
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(these functions are described further in Sec. 14.7.4). In the INTELSAT international network, at least two reference stations are used, one in the East and one in the West. These are designated primary reference stations, one of which is further selected as the master primary. Each primary station is duplicated by a secondary reference station, making four reference stations in all. The fact that all the reference stations are identical means that any one can become the master primary. All the system timing is derived from the high-stability clock in the master primary,
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which is accurate to 1 part in 1011 (Lewis, 1982). A clock on the satellite is locked to the master primary, and this acts as the clock for the other participating earth stations. The satellite clock will provide a constant frame time, but the participating earth stations must make corrections for variations in the satellite range, since the transmitted bursts from all the participating earth stations must reach the satellite in synchronism. Details of the timing requirements will be found in Spilker (1977). In the INTELSAT system, two reference bursts are transmitted in each frame. The first reference burst, which marks the beginning of a frame, is transmitted by a master primary (or a primary) reference station and contains the timing information needed for the acquisition and synchronization of bursts. The second reference burst, which is transmitted by a secondary reference station, provides synchronization but not acquisition information. The secondary reference burst is ignored by the receiving earth stations unless the primary or master primary station fails.
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