microcells - Maxwell

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Dual-Mode Systems and Phones • One of the most important features of the TDMA digital cellular radio system is its backward compatibility with AMPS. • Figure 3.17 is a block diagram for a typical dualmode TDMA cell phone. • A duplexer is required for analog operation. • The fact that the channel bandwidth and frequencies are the same for analog and digital systems simplifies the RF design. For instance, only one receiver IF filter is needed.
Data Communication with Digital Cellular Systems • Circuit-switched data communication can be accomplished with the digital system by inputting the data directly to the voice time slots without using the vocoder. • The data rate is limited to 9600 b/s to allow for additional error correction and still fit within the 13 kb/s allocated for voice data. • Of course, the system has to be told about this, so that the data can be output properly at the other end.
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 and 34: • In the last two lines of Table
Page 35 and 36: Fig. 10.14 TDMA frame [1] • Each
Page 37 and 38: • The data rate available for eac
Page 39 and 40: TDMA Control Channels • The IS-13
Page 41: Privacy and Security in Digital Cel
Page 45: References • [1] R. Blake, "wirel

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