What's the difference between spreading and scrambling

1. What is the difference between spreading and scrambling?
2. What is scrambling in 5g?
3. Why scrambling is used in LTE?
4. What does scrambling code mean?
5. Does the scrambling code spread the signal further?
6. What is the purpose of a scrambling code in UMTS?

What is the difference between spreading and scrambling?

Spreading is used in combination with scrambling. Scrambling is used on top of spreading to separate mobile terminals or cells from each other. Scrambling does not change the chip rate nor the bandwidth.

What is scrambling in 5g?

The function of the scrambling is to remove long string of ones (1s) and zeros (0s) from the digital binary data. Scrambler is used in physical layer transmitter where as descrambler is used at receiver. The scrambling does not increase or decrease the bit rate i.e. the input and output bits are same in size.

Why scrambling is used in LTE?

By using the scrambling code, NodeB can separate signals coming simultaneously from many different UEs and UE can separate signals coming simultaneously from many different NodeB.

What does scrambling code mean?

Scrambling Codes are used to identify and distinguish cells from one another in WCDMA networks. These SCs are reported by the mobile users to the network to declare which cells they are able to connect to.

Does the scrambling code spread the signal further?

Because scrambling is used on top of spreading as shown Figure 1, it does not change the bandwidth of the signal, but only makes the signals from different users separable from each other [3].

What is the purpose of a scrambling code in UMTS?

Each base station in the UMTS mobile communication systems has a unique scrambling code called “primary scrambling code” that is used to allow terminals to differentiate each base station from other base stations in the system.