cellular technology

Summary in slides

1. Start of the cellular technology, the need for new commercial applications of wireless

2. the bottleneck of capacity

3. Examine capacity of FDMA, TDMA, and CDMA

• TDMA:FDMA 7(theoretically), 3(practically)
• CDMA:FDMA 40(theoretically), 10 (practically)

4. Why cellular is better than broadcast?

5. Digital wireless with TDMA, CDMA

• advanced of digital ICs
• price drop

6. Major issues with CDMA

near-far field effect

hand-off

7. and their solutions

• Power control
• soft handoff

8. Make use of dead time in telephone conversations, about 65% of the time

• variable-rate coder

reference: Chap. 1~Chap. 6, Dave Mock, the Qualcomm Equation, AMACOM, 2005

Homework 9-27-2008

1. Install Google Browser Google Chrome and Firefox 3.0, try a few websites and compare their performance. For example, youtube, blogspot, msn, and yahoo.
2. Subscribe to our course website by Google reader, put the Google reader block on your iGoogle.

3. Comment on the article Serious potential in Google's Browser

4. Watch the video recording of Larry Page's "Broadband for the future."

Due 10-4-2008

Notice

On Oct 11, Oct 18 there will be no class meetings. I will present papers at ACM ASSETS 2008 in Halifax, Canada.

Discussions for Sep. 27, 2008

It would be great if you can read the following materials before class meets.

Evolutions of Cellular Phones (continued from last week), Cloud Computing

latest stuff:

• Google Browser Google Chrome
• Serious potential in Google's Browser
• Browser market share
• Google's dream, Apple's nightmare?
• Gordon's summary of Lee's talk on cloud computing
• Edgar's questions for cloud computing

Homework 9-20-2008

1. Write a 200-word summary for today's discussion.
2. Watch the video recording of KF Lee's keynote speech on WWW 2008 Beijing on Cloud computing. Feel free to write what you think.

Due 9-27-2008


Notes:
Weekly homework is presented on your own blog. See instructions about how to create blogs. You may take a look at some examples of homework.

Sep. 20, 2008 slides download address

Evolutions of Cellular Phones by Nokia