SEW Day 6

Question 1

• Common nodes in a communication network (such as satellites) must be interconnected with all types of users as flexibly as possible
• Google: techniques that allow multiple users to share the same communication channel simultaneously

Answer 1

Multiple Access

Question 2

Types of Multiple Access

Answer 2

• Frequency Division Multiple Access
• Time DMA
• Code DMA

Question 3

Assigned bandwidth is divided into segments. User operate at the same time, using different frequencies.

Answer 3

Frequency Division Multiple Access (FDMA)

Question 4

Advantages & Disadvantages of FDMA

Answer 4

o Advantages: simple and easy to set up
o Disadvantages: once set up, it’s difficult to change, uses up a lot of the spectrum

Question 5

Allocation of specific time slots for transmission. Users operate on same frequencies, different times.

frequency stays the same, time changes

Answer 5

Time Division Multiple Access (TDMA)

Question 6

All users transmit signals simultaneously on the multiple access channel.

time and frequency stays the same, code changes

Answer 6

Code Division Multiple Access (CDMA)

Question 7

Advantages + Disadvantages Time Division Multiple Access (TDMA)

Question 8

Advantages + Disadvantages Code Division Multiple Access (CDMA)

Question 9

The process of combining signals into a composite baseband to modulate on to a single carrier

Answer 9

Multiplexing

Question 10

What stays the same? What Changes

Answer 10

FDMA - Time stays the same, frequency changes