Color Division Multiple Access (CDMA) ?

  • Thread starter Swamp Thing
  • Start date
  • #1
Swamp Thing
Insights Author
908
576
And also polarization division multiple access!...

The quest to maximize channel capacity is older than we may realise.

 
Science news on Phys.org
  • #2
Swamp Thing said:
And also polarization division multiple access!...

The quest to maximize channel capacity is older than we may realise.


In the old days paper was so expensive they left out spaces and vowels. Nspcsrvwls!
 
  • #3
Interesting video but I dispute his 19th Century limit on cursive cross-writing.

Several famous "Beat" authors including Jack Kerouac and William S. Burroughs, when writing in notebooks instead of using typewriters, played with cross writing as their notebooks became filled. A lesser known collaborative novel entitled "And the Hippos Were Boiled in Their Tanks" published in book form in 2008 had both authors writing over each other in manuscript including cursive over collage from newspaper accounts of the subject of the novel.

Author and English professor Samuel R. Delany featured cross-writing throughout his epic 1975 SF novel "Dhalgren". Mysterious stranger Kid receives a notebook from his (future) lover filled with prose but only on one side of each page. Deciding to write poetry describing his surroundings, Kid covers blank sections of the notebook with cursive writing, fitting it where he can including writing over previous text.

This cross-writing and cross-fertilization of ideas becomes so central to Delany's notions of communication and discourse that excepts from Kid's notebook appear in an Appendix titled Anathemata. This final chapter displays text versions of cursive writing two and even three levels deep spanning different times in the long novel including (possibly) before "Dhalgren" begins and even after the action ends due to the time digression inherent in cross-writing (new text written across and beside previous text).
 
  • Like
Likes Swamp Thing

Related to Color Division Multiple Access (CDMA) ?

1. What is Color Division Multiple Access (CDMA)?

CDMA is a digital cellular technology that uses spread spectrum techniques to allow multiple users to share the same frequency band simultaneously. It assigns a unique code to each user to differentiate their signals, allowing for more efficient use of the available bandwidth.

2. How does CDMA differ from other multiple access technologies?

CDMA differs from other multiple access technologies, such as Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA), by allowing multiple users to transmit simultaneously on the same frequency band. This is achieved by using unique spreading codes to differentiate between users, rather than dividing the frequency band into separate time slots or frequency channels.

3. What are the advantages of CDMA?

Some of the advantages of CDMA include increased capacity, improved call quality, enhanced security, and better resistance to interference and fading. CDMA also allows for seamless handoffs between cells and supports a wide range of data rates, making it suitable for both voice and data transmission.

4. What are the limitations of CDMA?

Some of the limitations of CDMA include the need for complex signal processing algorithms, which can increase the cost and complexity of the system. CDMA also requires careful planning and coordination to avoid interference between users, and it may not be as efficient in certain deployment scenarios compared to other multiple access technologies.

5. How is CDMA used in modern communication systems?

CDMA is used in modern communication systems, such as 3G and 4G cellular networks, to provide reliable and efficient wireless communication services. It is also used in satellite communication, wireless LANs, and other wireless applications where multiple users need to share the same frequency band. CDMA continues to evolve with advancements in technology, such as the introduction of LTE and 5G networks.

Similar threads

Replies
22
Views
2K
  • Programming and Computer Science
Replies
1
Views
703
Replies
2
Views
863
  • Engineering and Comp Sci Homework Help
Replies
11
Views
907
Replies
1
Views
879
  • General Math
Replies
16
Views
2K
Replies
3
Views
295
  • Set Theory, Logic, Probability, Statistics
Replies
1
Views
1K
  • Quantum Interpretations and Foundations
Replies
15
Views
276
  • Math Proof Training and Practice
Replies
25
Views
2K
Back
Top