What are the characteristics and advantages of CDMA technology?

Features:

1. Strong anti-interference ability. This is the basic feature of spread spectrum communication, which is incomparable to all communication methods.

2, broadband transmission, strong anti-fading ability.

3. Because broadband transmission is adopted, the power of the useful signal transmitted in the channel is much lower than that of the interference signal, so the signal seems to be hidden in the noise; That is, the power density is relatively low, which is beneficial to signal concealment.

4. Using the correlation of spreading codes to obtain the information of users has strong anti-interception ability.

5. Multiple users receive and send at the same time.

Advantages:

1. Large system capacity

Theoretically, the capacity of CDMA mobile network is 2 times larger than that of analog network, 1 times larger than that of analog network in actual use and 4-5 times larger than that of GSM.

2. Flexible configuration of system capacity

In CDMA system, the increase of the number of users is equivalent to the increase of background noise, resulting in the decline of voice quality. However, there is no limit to the number of users, and operators can compromise between capacity and voice quality. In addition, multiple cells can be distinguished by different sequence codes according to traffic

3 and simple frequency planning < P >, so different CDMA carriers can be used in adjacent cells, and the network planning is flexible and easy to expand.

4. Low network construction cost

CDMA technology simplifies the planning of the whole system by using the same frequency in each part of each cell, and reduces the number of required stations without reducing the traffic, thus reducing the deployment and operation costs. CDMA network has large coverage, high system capacity and few base stations, which reduces the network construction cost.

Extended materials:

Development direction

CDMA is the development direction of mobile communication technology. In the 2G stage, CDMA enhanced IS95A and GSM are in the same generation of products in terms of technical system, providing roughly the same services.

however, CDMA technology has its unique features, such as good call quality, less dropped calls, low radiation, health and environmental protection. At the 2.5G stage, CDMA21XRTT is obviously different from GPRS in technology, with 1XRTT higher than GPRS in transmission rate and more mature than GPRS in new service bearer, which can provide more new services with medium and high speed.

in the transition from 2.5G to 3G, the transition from CDMA21.X to CDMA23.X is smoother than that from GPRS to WCDMA.

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