What is channelisation code?
What is channelisation code?
The channelization codes are Orthogonal Variable Spreading Factor (OVSF) codes. They are used to preserve orthogonality between different physical channels. They also increase the clock rate to 3.84 Mcps. The OVSF codes are defined using a code tree.
How codes are used in UMTS?
The channelisation codes used in Universal Mobile Telecommunications System (UMTS) belong to the family of OVSF codes. They are organised according to a code tree structure. OVSF codes are primarily used to preserve orthogonality between different channels.
How many scrambling codes are there in UMTS?
15.6 Spreading and Scrambling in UMTS
| Synchronization codes | Scrambling codes, downlink | |
|---|---|---|
| Length | 256 chips | 38,400 chips |
| Duration | 66.67 μs | 10 ms |
| Number of codes | 1 primary code/16 secondary codes | 512 primary/15 secondary for each primary code |
| Spreading | No, does not change bandwidth | No, does not change bandwidth |
What is a scrambling code?
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.
What is UMTS network?
UMTS (Universal Mobile Telecommunications Service) is a third-generation (3G) broadband, packet-based transmission of text, digitized voice, video, and multimedia at data rates up to 2 megabits per second (Mbps).
How long is WCDMA frame?
radio frame structure of WCDMA is shown in Figure 1 [15]. Frame structure has an overall length of 10 ms, comprising 15 time-slots. … a SDR- based channel data recorder is developed.
What is scrambling in LTE?
It is “Scrambling Code”. 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. A specific bit sequence which is used for scrambling is called ‘Scrambling code’.
Why scrambling is used in 5g?
There are two main reasons why scrambling is used: To enable accurate timing recovery on receiver equipment without resorting to redundant line coding.
What does WCDMA mean for phones?
Wideband Code Division Multiple Access
WCDMA (Wideband Code Division Multiple Access) UMTS standard for 3G digital mobile networks, using CDMA technology.
Is UMTS 3G or 4G?
UMTS is already 3G. GSM is 2G and 2.5G. 2. It is mainly CDMA-based.
What is a channelization code?
The channelization codes are Orthogonal Variable Spreading Factor (OVSF) codes. They are used to preserve orthogonality between different physical channels. They also increase the clock rate to 3.84 Mcps. The OVSF codes are defined using a code tree.
What are channelization codes in WCDMA?
Channelization codes are generated recursively to form a binary tree structure. In a WCDMA system, isolation between users in the downlink is accomplished through the combination of user-specific channelization codes and cell-specific scrambling codes.
What is the difference between OVSF code and channelization code?
Channelization uses OVSF code, for keeping the orthogonality of different subscriber physical channels. OVSF can be defined as the code tree illustrated in the diagram. Channelization code is defined as Cch SF, k,, where, SF is the spreading factor of the code, and k is the sequence of code, 0?k?SF-1.
What is the UMTS World?
The UMTS World is an 3G mobile system news and information provider. Comprehensive coverage of UMTS / 3G news, licensing, business developments, 3G WCDMA telecommunication technology, multi media mobile phones and future communications.
