Telecommunications cdma means code division multiple access. The full English name is Code Division Multiple Access. It is a technology used in wireless communications. CDMA allows all users to use the entire frequency band 1.2288Mhz at the same time and excludes other users. The signal is regarded as noise, and there is no need to consider the signal collision problem at all.
1. The so-called CDMA, its full English name is Code Division Multiple Access, and its Chinese meaning is Code Division Multiple Access. It is a technology used in wireless communications. CDMA All users are allowed to use all frequency bands (1.2288Mhz) at the same time, and signals from other users are regarded as noise, without having to consider the problem of signal collision.
2. The voice coding technology provided in CDMA has better call quality than the current GSM, and can reduce the noise in the surrounding environment during the user's conversation, making the call clearer.
3. In terms of security performance, CDMA not only has a good authentication system, but also uses codes to distinguish users due to its transmission characteristics, and its ability to prevent eavesdropping is greatly enhanced.
4. Wideband CDMA (WCDMA) wideband code division multiple access transmission technology is an important basic technology of IMT-2000 and will be one of the third-generation digital wireless communication system standards.
5. CDMA2000 is the latest network and belongs to the 3G network.
6. Generally speaking, CDMA is a better communication network than GSM. Compared with GSM, its disadvantages are the following points: 1. Clearer call quality and background noise blocking function (even If you are in an entertainment venue such as a KTV with high decibels, the other party will not be able to hear your ambient noise during the call).
7. 2. High confidentiality. It adopts the third generation encryption technology of the US military. Even if your call information is intercepted, it will take several weeks for the other party to decrypt it using the fastest computer available. Let alone an ordinary computer.
8. 3. The radiation is ultra-low, 1/843 of GSM mobile phones. Therefore, CDMA mobile phones are also called green mobile phones.
9. 4. The base station has large bandwidth capacity and can easily complete high-speed Internet access, up to 153K, which is much faster than GSM’s 56K.
10. 5. CDMA’s unique soft handover technology can make handovers between base stations more stable and enable high-speed movement without losing the line (the experiment on the Shanghai Maglev in 2005 can prove that at a speed of 450 kilometers per hour will not be lost).
11. 6. It has a wider communication frequency band than GSM and can realize multiplexing technology at the same time to achieve the highest utilization rate of the network. China Unicom and China Netcom merged and moved to China Telecom sells CDMA services, so now Telecom also has CDMA mobile services. The new CDMA numbers are still mainly 133 and 153, but there will soon be new numbers starting with 189, called Telecom Tianyi.
12 and 189 numbers are the new mobile phone number segments of China Telecom’s mobile business Tianyi brand. It allows you to enjoy healthy and low-cost calls while also allowing you to access wireless high-speed Internet anytime, anywhere, and experience a super value mobile Internet business.
13. The 189 number is a new mobile phone number segment of the Tianyi brand of China Telecom’s mobile business. It allows you to enjoy healthy and low-cost calls while also allowing you to access wireless high-speed Internet anytime, anywhere, and experience a super value mobile Internet business.
14. Number reservation is a long-term activity carried out by China Telecom to meet the special needs of customers for mobile phone numbers.
15. You can choose the number you are satisfied with at any time through the China Telecom online business hall, No. 10000, the counter of each business hall, or directly contact your account manager.
16. When reserving a number, please provide your real ID card and other relevant information. In principle, each ID card can reserve 1-2 numbers. My e-home and business pilot customers can reserve 2-3 numbers. number. During the process of registering the reservation number, you are required to provide the certificate information of the final customer.
17. After reserving a number, you need to go to the China Telecom business hall and other places to complete the network access procedures within the agreed time. After the processing time is exceeded, the number you reserved will be withdrawn for other customers to choose from.
18. The reservable numbers provided by China Telecom include the same numbers as the fixed-line or mobile phone numbers you are currently using, consecutive numbers or similar numbers (such as couple serial numbers, family serial numbers, etc.) , numbers with special meanings such as 521 (I love you), and popular numbers (such as numbers ending in 6, 8, 9, etc. that are easy to remember and have good meanings), etc.
19. Of course, any number you like and think is meaningful is a good number.
20. Have you thought of your favorite number now? Do you want your and your family’s mobile phone numbers to be connected... Hurry up and join the number reservation activity launched by China Telecom. Your favorite number is now available Waiting for you! For details, please consult your local China Telecom business office, No. 10000, or online business office.
21. China Telecom Tianyi 189 is worth looking forward to, so please make an appointment! Telecom’s card is called UIM card, and CDMA is the standard. Telecom’s card must be used with CDMA mobile phones, which means that China Mobile and China Unicom’s mobile phones use Can't accept telecom card.
22. Code Division Multiple Access (CDMA) is a new and mature wireless communication technology developed on spread spectrum communication technology, a branch of digital technology.
23. The principle of CDMA technology is based on spread spectrum technology, that is, the information data that needs to be transmitted with a certain signal bandwidth is modulated with a high-speed pseudo-random code with a bandwidth much larger than the signal bandwidth, so that the bandwidth of the original data signal is expanded. Then it is modulated by the carrier and sent out.
24. The receiving end uses exactly the same pseudo-random code to perform related processing with the received bandwidth signal, and replaces the broadband signal with a narrowband signal of the original information data, that is, despreading, to achieve information communication.
25. CDMA refers to a spread spectrum multiple access digital communication technology that establishes channels through unique code sequences and can be used for any protocol in second- and third-generation wireless communications.
26. Hello: Telecom CDMA (Code Division Multiple Access), also known as Code Division Multiple Access, is a technology used in telecom wireless communications.
27. All mobile phones that support CDMA can use China Telecom mobile phone cards.
28. I hope my answer will be helpful to you. If you have any questions, please feel free to continue to consult us.
29. Hello, first of all, thank you for your support to China Telecom.
30. According to your description, CDMA is the network standard used by China Telecom’s mobile phones. It is green and environmentally friendly and has low radiation. In addition, China Telecom’s CDMA 3G network achieves full coverage. You can enjoy China Telecom’s high-quality 3G wherever you go. network.
31. If you need to check the bill or pay the phone bill, please log in to the Anhui Telecom Online Business Hall.
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