CDMA occupied frequency band

CDMA 1X uses a spreading rate of SR1, which means that the forward channel and the reverse channel use a single-carrier direct series spread spectrum with a chip rate of 1.2288 Mbit/s. So it can be backward compatible with IS-95 (A/B) conveniently, realize the smooth transition. Because CDMA 1X uses new technologies such as reverse coherent demodulation, fast forward power control, transmit diversity, and Turbo coding, its capacity is much higher than that of IS-95. Under the same conditions, the capacity for the plain voice service is roughly twice that of the IS-95 system. The CDMA 1X network can serve as a bearer platform for voice services, and can also serve as a wireless access Internet packet data platform, which can provide users with traditional voice services, and can also provide users with end-to-end packet transmission mode data services.

CDMA 800MHZ

When China Unicom first built a CDMA network, it was handed over to the Unicom by the telecommunications Great Wall, which made Unicom easily obtain bi-directional 10M frequency resources on the 800 MHz frequency band, which enabled Unicom to have valuable frequency resources. Therefore, Unicom has established a CDMA network using its resources in the 800 MHz band.

The CDMA network is constructed and operated by Unicom, and the market space that this exclusive operating right can bring is also obvious. With the support of CDMA network, Unicom can realize many new value-added data services, which may win more CDMA users.