The advantages of CDMA

(1) system capacity
In theory, using the same frequency resources, CDMA mobile network than the analog network capacity 20 times more than in the actual use of large analog network 10 times larger than 4-5 times that of GSM.
(2) capacity of the system configuration flexibility
In the CDMA system, the increase in the number of users is equivalent to an increase in background noise, resulting in a decline in voice quality. However, There is no limit on the number of users, operators can be among the capacity and voice quality to consider a compromise. In addition, the small number of traffic between and interference based on auto-balance.
The characteristics of CDMA and the relevant mechanism. CDMA is a disturbance from the system, all mobile users occupy the same frequency and bandwidth, an analogy, the bandwidth will be thought of a big house and all the people who will be the only big house. If they use a completely different language, they can clearly hear his voice only be from some other people's interference. Here, the room air can be thought of as broadband carrier, and different languages were used as codes, we can increase user constant background noise until the entire restrict us. If the user can control the signal strength, while maintaining high-quality calls at the same time, we will be able to accommodate more users.
(3) better call quality
TDMA channel structure can only support 4Kb voice encoder, it can not support more than 8Kb voice encoder. CDMA and the structure can support voice 13kb encoder. Can provide better call quality. CDMA vocoder system can dynamically adjust the data transfer rate, and in accordance with the appropriate threshold choose a different grade level launch. At the same time, according to background noise threshold of change and change so that even in the larger background noise, can get a better call quality. In addition, TDMA uses a hard-handed manner, the user can clearly feel the call of the interruption in user-intensive, base stations in the city, especially on the continuity of this, because in such areas occur every 2 minutes to 4 transfer. The CDMA system, "dropped calls" significant reduction, CDMA system uses a soft-switch technology, "and then connect to disconnect," so hard to switch completely to overcome the shortcomings of dropped calls easily.
(4) simple frequency planning
By the user to distinguish between different code sequences, it is not the same CDMA carrier in the adjacent residential use, flexible network planning, expansion simple.
(5) low-cost network
CDMA cellular technology in each and every part of the same frequency, to simplify the planning system as a whole, without lowering traffic situations to reduce the number of sites needed to reduce the deployment and operation costs. CDMA network coverage, high-capacity system required a small base station, reduces the cost of network building.
CDMA digital mobile technology and is now well-known GSM digital mobile systems. Simulation technology, known as the first generation of mobile phone technology, GSM is a second-generation, CDMA is a second-generation mobile communication technology and a half, more advanced than GSM.