CDMA Write for us
CDMA: Code Division Multiple Access CDMA is the abbreviation of Code Division Multiple Access. This is a channel access method used by some radio communications technologies. This is a digital mobile technology and an example of multiple access. They were generally used for mobile communications.
Multiple access means multiple transmitters can transmit information simultaneously over one communication channel. In this system, different CDMA codes are assigned to different users, and users can access the entire bandwidth for the entire duration. This optimizes available bandwidth when transmitting the entire frequency range and does not limit the user’s frequency range.
Thus, CDMA allows multiple users to share a frequency band without undue interference between users. It is used as an access method in many mobile phone standards.
CDMA: Code Division Multiple Access
CDMA technology was developed during World War II. British allies developed it to protect their wireless transmissions from interference. When the war ended, Qualcomm patented this technology and made it available commercially. The first CDMA system was launched in September 1995 in Hong Kong by Hutchison Telephone Co.
Use
- It is used in Global Positioning Systems (GPS).
- It is used by some mobile phone companies (for example, the Qualcomm IS-2000 standard, also known as CDMA2000)
- W-CDMA is used in the UTMS 3G cellular telephone standard.
- CDMA has been used in the OmniTRACS satellite system for transportation.
- CDMA Category
- Synchronous CDMA (orthogonal code)
- Asynchronous CDMA (pseudo-random code)
Difference between CDMA and GSM
The main differences between CDMA and GSM are given below.
CDMA GSM Criteria: CDMA technology is based on spread-spectrum technology, which optimizes available bandwidth. GSM operates on a wedge spectrum. It uses time division multiple access (TDMA) and frequency division multiple access (FDMA). TDMA provides multi-user access by cutting the channel into different time slices, and FDMA provides multi-user access by separating the frequencies used.
CDMA security is safer than GSM. GSM is less secure than CDMA.
CDMA’s global coverage is used in the US, Canada, and Japan. CDMA is only used by 24% of users worldwide. GSM is used in over 80% of the world’s networks in more than 210 countries.
GSM is used by 76% of users worldwide.
Data Transfer Speed CDMA has faster data transfer compared to GSM. GSM has slower data transfer compared to CDMA.
Radiation exposure CDMA phones emit less radiation than GSM phones. GSM phones emit continuous wave pulses and almost 28 times more radiation than CDMA phones.
How does CDMA work?
Cell clusters form the cellular architecture of a wireless CDMA network. Each cell has a transceiver with the required transmission power in a cell cluster, and mobile units are distributed around the cell’s coverage area. Each cellular unit has a transceiver, which consists of a sensitive receiver and a low-power transmitter that operates in a wireless cellular environment. Access interference, fading, and multipath propagation are some of the features of the cellular environment.
New 5g technology
Older protocols will be replaced by 5G cellular technology, and CDMA will increasingly lose its significance as 5G wireless systems develop. Data transfer speeds on mobile networks are expected to increase significantly with 5G, making them competitive.
With a fiber optic network. Beyond what can be achieved with 4G, this technology provides better broadband capacity, reliability, and bandwidth. 5G is primarily supported by millimeter wave (MM wave) bands at 26, 28, 38, and 60 GHz. This frequency range enables data transport speeds of up to 20 gigabits per second (Gbps). The 64-256 Massive Multiple Input, Multiple Output (MIMO) antennas enable 5G to deliver at least ten times faster than those offered by 4G networks.
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