FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies: TDMA, GSM and code-division multiple access (CDMA).

Detailed explanation-2: -CDMA and GSM were the most commonly used phone bands and most popular mobile communication standards between 1990-2010. CDMA and GSM are not new radio technologies; they both belong to the second generation of digital mobile standards otherwise known as 2G, which replaced the first-generation analog 1G.

Detailed explanation-3: -CDMA uses spread spectrum technology to transmit data. This technology permits several phones to send and receive through a single channel. Each part of these separate conversations is labeled with a specific digital code. The carriers that use CDMA technology include Sprint, Verizon, Alltel, and NEXTEL.

Detailed explanation-4: -Code Division Multiple Access (CDMA) is a sort of multiplexing that facilitates various signals to occupy a single transmission channel. It optimizes the use of available bandwidth. The technology is commonly used in ultra-high-frequency (UHF) cellular telephone systems, bands ranging between the 800-MHz and 1.9-GHz.

Detailed explanation-5: -GSM uses a version of time division multiple access (TDMA) to divide up frequencies in the electromagnetic spectrum for multiple users to access the mobile system [5]. In its implementation, CDMA utilizes a version of frequency division multiplexing.