Third generation (3G) system & CDMA technology || EC Academy

Summary

This lecture introduces third generation (3G) systems, highlighting their advancements over 2G networks, including faster data transfer and improved voice quality. It discusses key 3G technologies like UMTS and CDMA 2000, emphasizing their role in enabling both data and voice communication. The lecture also covers CDMA technology, detailing its bandwidth optimization, frequency range, and advantages such as lower radiation emissions and effective error control. Overall, it underscores the transformative impact of 3G on mobile communications, paving the way for smartphone innovation and enhanced multimedia experiences.

Takeaways

• 📱 Third generation (3G) systems are an upgrade over 2G, 2.5G (GPRS), and 2.75G (EDGE), offering faster data transfer and better voice quality.
• ⚡ 3G systems support high-speed packet-switched data up to 2 Mbps, significantly improving performance compared to previous generations.
• 🌐 Smartphones were first introduced with 3G technology, marking a major advancement in mobile communication.
• 📡 3G operates on frequency bands ranging from 400 MHz to 3 GHz, allowing for diverse communication capabilities.
• 📊 The two main 3G networks are UMTS (Universal Mobile Telecommunications System) and CDMA 2000, both utilizing CDMA technology.
• 🗣️ 3G systems enable both data and voice communication, with packet-switched domains for data and circuit-switched for voice.
• 🎶 Applications of 3G include music streaming, video conferencing, internet access, and global roaming, which were not possible with 2G.
• 🔄 CDMA (Code Division Multiple Access) technology optimizes bandwidth usage, enhancing overall system efficiency.
• 🌍 Approximately 24% of mobile users worldwide use CDMA technology, although it is less prevalent than GSM.
• 📉 CDMA phones emit less radiation compared to GSM phones, contributing to a potential health benefit for users.

Q & A

What is the main purpose of third generation (3G) systems?

The main purpose of 3G systems is to enable both data and voice communication, offering faster data transfer and better voice quality compared to previous generations.

What are the frequency bands used by 3G systems?

3G systems operate on frequency bands ranging from 400 megahertz to 3 gigahertz.

What are the two primary 3G networks mentioned in the transcript?

The two primary 3G networks mentioned are UMTS (Universal Mobile Telecommunications System) and CDMA 2000.

How does CDMA technology differ from TDMA?

CDMA (Code Division Multiple Access) differs from TDMA (Time Division Multiple Access) by optimizing the use of available bandwidth, allowing multiple users to occupy the same time and frequency channel.

What is the significance of packet-switched and circuit-switched domains in 3G?

The packet-switched domain is used for data communication, while the circuit-switched domain is used for voice communication, enabling the simultaneous handling of both types of traffic.

What are some applications of 3G technology?

3G technology supports applications such as music streaming, movie watching, internet access, video conferencing, and universal global roaming.

What percentage of users worldwide utilize CDMA technology?

Approximately 24 percent of users worldwide utilize CDMA technology, which is less compared to GSM technology.

What are the frequency ranges for CDMA technology?

CDMA technology operates within frequency bands ranging from 800 megahertz to 1.9 gigahertz.

What are the advantages of CDMA technology mentioned in the script?

The advantages of CDMA technology include error control coding, spectrum spreading for maximum frequency utilization, soft handoff, and power control.

How does CDMA technology compare to GSM in terms of radiation emissions?

CDMA technology emits less radiation compared to GSM phones.