Module 5 (1)
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This document discusses different channelization protocols for sharing bandwidth in wireless networks, including Frequency-Division Multiple Access (FDMA), Time-Division Multiple Access (TDMA), and Code-Division Multiple Access (CDMA). It explains that in FDMA the bandwidth is divided into frequency bands separated by guard bands. In TDMA the bandwidth is timeshared between stations. And in CDMA all transmissions occur simultaneously on one channel using unique code assignments. Diagrams and figures are included to illustrate each protocol.
Module 5 (1)
- 1. 12.1 Module-5 Multiple Access Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
- 2. 12.2 Figure 12.1 Data link layer divided into two functionality-oriented sublayers
- 3. 12.3 Figure 12.2 Taxonomy of multiple-access protocols discussed in this chapter
- 4. 12.4 12-3 CHANNELIZATION12-3 CHANNELIZATION ChannelizationChannelization is a multiple-access method in whichis a multiple-access method in which the available bandwidth of a link is shared in time,the available bandwidth of a link is shared in time, frequency, or through code, between different stations.frequency, or through code, between different stations. In this section, we discuss three channelizationIn this section, we discuss three channelization protocols.protocols. Frequency-Division Multiple Access (FDMA) Time-Division Multiple Access (TDMA) Code-Division Multiple Access (CDMA) Topics discussed in this section:Topics discussed in this section:
- 5. 12.5 Figure 12.21 Frequency-division multiple access (FDMA)
- 6. 12.6 In FDMA, the available bandwidth of the common channel is divided into bands that are separated by guard bands. Note
- 7. 12.7 Figure 12.22 Time-division multiple access (TDMA)
- 8. 12.8 In TDMA, the bandwidth is just one channel that is timeshared between different stations. Note
- 9. 12.9 In CDMA, one channel carries all transmissions simultaneously. Note
- 10. 12.10 Figure 12.23 Simple idea of communication with code
- 11. 12.11 Figure 12.24 Chip sequences
- 12. 12.12 Figure 12.25 Data representation in CDMA
- 13. 12.13 Figure 12.26 Sharing channel in CDMA
- 14. 12.14 Figure 12.27 Digital signal created by four stations in CDMA