1. Multiple Access Protocols
Chapter 7

2. Channelization

3. Topics discussed in this section:
CHANNELIZATION
Channelization is a multiple-access method in which the available bandwidth of a link is shared in time, frequency, or through code, between different stations. In this section, we discuss three channelization protocols.
Topics discussed in this section:
Frequency-Division Multiple Access (FDMA) Time-Division Multiple Access (TDMA)
Code-Division Multiple Access (CDMA)

4. Frequency-division multiple access (FDMA)

5. Note
In FDMA, the available bandwidth of the common channel is divided into bands that are separated by guard bands.

6. Time-division multiple access (TDMA)

7. Note
In TDMA, the bandwidth is just one channel that is timeshared between different stations.

8. In CDMA, one channel carries all transmissions simultaneously.
Note
In CDMA, one channel carries all transmissions simultaneously.

9. Simple idea of communication with code

10. Chip sequences

11. Data representation in CDMA

12. Sharing channel in CDMA

13. Digital signal created by four stations in CDMA

14. Decoding of the composite signal for one in CDMA

15. AMPS is used in North America
Note
AMPS (Advanced Mobile Phone Service) is an analog cellular phone system using FDMA.
AMPS is used in North America

16. Second-generation cellular phone systems
Interim Standard 95 (IS-95) is the first CDMA-based digital cellular standard by Qualcomm (CDMAOne).
IS-136 (TDMA technology) is the alternative to Digital (D)-AMPS, which has been supplanted by IS-2000 (CDMA2000).

17. Samsung cdmaOne mobile phone disassembled

18. Huawei CDMA2000 EVDO USB wireless modem (3G Technology)