CDMA: what it is, how it works and what it does
Code Division Multiple Access technology used in 2G cellular networks, operating in 800 and 1900 MHz bands.
Definition
CDMA (Code Division Multiple Access) is a multiple access technology employed in cellular communication systems. In the context of 2G connectivity, it allows multiple users to share the same frequency channel by assigning unique codes to each signal.
Architecture and Principles
CDMA operation is based on spread spectrum, where the data signal is multiplied by a pseudo-random noise code. This allows signals from different users to overlap in the frequency domain without significant interference, provided the receiver knows the specific code to decode the desired signal.
Applications and Scope
According to the provided evidence, this technology is implemented specifically in 800 MHz and 1900 MHz frequency bands. These bands are standard for second-generation cellular network coverage, offering a balance between range and transmission capacity in urban and rural environments.
Interpretation in Products
The presence of the specification CDMA 800 / 1900 in a device indicates that the equipment is compatible with 2G cellular networks using this technology in these bands. This ensures basic voice and data connectivity in regions where operators deploy CDMA infrastructure at these specific frequencies.
Limitations
As a 2G technology, CDMA offers lower data speeds than subsequent generations (3G, 4G, 5G). Its use is limited mainly to basic services and compatibility with legacy networks still operating in these frequency bands.