microcells - Maxwell

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TDMA Voice Channel • Figure 3.14 shows how the RF voice channel is divided in the TDMA system. • There are 25 frames per second so each frame is 1/25 s =40 ms in length. • Each frame has 1944 bits so the total bit rate for the RF signal is 1944 x 25=48.6 kb/s. • Phase-shift keying with four levels (pai/4 QPSF) is used, so there are two bits per symbol and the baud rate is 24.3 kbaud. This is a data of 48.6/30=1.6b/s per hertz of bandwidth.
Fig. 10.14 TDMA frame [1] • Each frame has six time slots lasting 40 ms/6=6.67 ms containing 1944/6 = 324 bits each. • For full-rate TDMA, each voice signal is assigned to two time slots as shown. Six voice signals, occupying one slot each, can be accommodated with half-rate TDMA.
Page 1 and 2: 3.6. Cell-Site Equipment • Traffi
Page 3 and 4: Fig. 3. 7 Cellular base station [1]
Page 5 and 6: • Fig. 3.8 Cellular radio system
Page 7 and 8: Traffic and Cell Splitting • The
Page 9 and 10: • Phone traffic is defined in erl
Page 11 and 12: Microcells, Picocelles and Repeater
Page 13 and 14: Fig. 3.9 Microcell site [1]
Page 15 and 16: • A microcell is often under the
Page 17 and 18: • The main cell site up-converts
Page 19 and 20: • Sometimes the problem is not ex
Page 21 and 22: 3.7. Fax and Data Communication Usi
Page 23 and 24: • The greater robustness results
Page 25 and 26: Cellular Digital Packet Data (CDPD)
Page 27 and 28: • When overhead is taken into acc
Page 29 and 30: • Recent advances in data compres
Page 31 and 32: • They lend themselves to time-an
Page 33: • In the last two lines of Table
Page 37 and 38: • The data rate available for eac
Page 39 and 40: TDMA Control Channels • The IS-13
Page 41 and 42: Privacy and Security in Digital Cel
Page 43 and 44: Data Communication with Digital Cel
Page 45: References • [1] R. Blake, "wirel

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