Code Division Multiple Access — Lesson 5

This lesson covers the different types of multiple access techniques used in satellite communication. It delves into the details of Code Division Multiple Access (CDMA). The lesson also explains the concept of space division multiple access (SDMA) and how it can be combined with other techniques to enhance the capacity of satellite multiple access. It further discusses the importance of bandwidth, power, and synchronization in these techniques. For instance, the lesson uses the example of the Iridium satellite constellation to illustrate the practical application of these techniques.

Video Highlights

00:18 - Code Division Multiple Access (CDMA) and its advantages
05:44 - Importance of code selection in CDMA
08:11 - Two types of CDMA: Direct Sequence and Frequency Hopping
08:55 - Calculation of Processing Gain in CDMA
11:02 - Energy to noise power density after dispreading
16:15 - Random Access and its advantages
17:48 - Demand Assigned Multiple Access (DAMA)
26:04 - Practical uses of SDMA in Iridium satellite constellation and Global star

Key Takeaways

- Each multiple access technique has its own advantages and disadvantages, and the choice depends on the specific requirements of the communication system.
- SDMA can be combined with other techniques to enhance the capacity of satellite multiple access.
- Bandwidth, power, and synchronization are crucial factors in these techniques.
- Practical applications of these techniques can be seen in systems like the Iridium satellite constellation.