microcells - Maxwell
microcells - Maxwell
microcells - Maxwell
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• The data rate available for each voice channel is<br />
260 bits/20 ms = 13 kb/s.<br />
• The voice is actually encoded at 7.95 kb/s and the<br />
remaining bits are used for error correction. The<br />
half-rate system will use 4 kb/s for voice coding.<br />
• The frames are synchronized for the forward and<br />
reverse channels, but the timing is offset so that a<br />
frame starts 90 bits (1.85 ms) earlier at the mobile.<br />
• Each time slot contains 324 bits for both forward<br />
and reverse channels.<br />
• The allocation of these bits is different for the<br />
forward and reverse links, however.<br />
• Figure 3.15 illustrates the TDMA voice time slots.