Frequency

Using spread-spectrum CDMA 1X SR1 rate for namely, to channel and reverse channel with 1.2288 chip rate Mbit/s single carrier direct way. Spread series, Therefore it can be easily and IS - 95 (A/B), backward compatibility, smooth transition. Because of using reverse 1X CDMA coherent demodulation, rapid prior to work, transmit diversity, Turbo coding techniques, the capacity of more than 95 - IS greatly improved. In the same condition, the average voice business, in roughly 95 - ahead for the capacity of the system. CDMA network can be used as a voice business 1X bearing platform, also can be used as a wireless access Internet packet data load platform, can provide users with the traditional voice business, also can provide end-to-end packet transmission mode of data.CDMA 800MHZUnicom CDMA network in the main telecoms handed unicom, make great 800MHz won easily unicom bi-directional frequency band on resources, which 10M is made with the frequency of precious China unicom. Therefore, China unicom is using its resources in 800MHZ frequency established CDMA network.By China unicom CDMA network construction and operation of unity, the exclusive right to the market space is very obvious. Has the support of China unicom CDMA network, many new value-added data can be realized, which is likely to win business users more code division multiple access (CDMA).2000MHZ CDMACDMA2000 is used to refer to the standard organization TIA for CDMA name. Applicable to 3G CDMA TIA norms IS called the technology itself - 2000, called CDMA2000.The first phase of the   CDMA2000 1x also called, with existing 95 - IS that the communication can be the whole system capacity doubled, and will be increased to $614kbps data rate. 1x higher than  CDMA2000 technology progress include 1xEV (high speed data rate).  QCT launched by MSM5000 ® chipset CDMA2000 solution decentralization cdmaOne (CDMA) IS - 95.By 3GPP2 CDMA2000 standards group, including Release 0, Release version, ev-do and EV - Release DV the main characteristic is used 0-41D core based on the ANSI, in the wireless network access and core business of increasing support group, this version has network entity. Unicom CDMA will be opening phase ii project using this version, single carrier rate can reach the highest downlink 153.6 kbit/s. Release A Release is strengthened, single carrier of 0 307.2 can reach the highest rate kbit/s, and support the voice business and grouping of business concurrently. Ev-do using single carrier to support data business, can be in the standard carrier of 125 MHz, meanwhile, we also provide voice and data services, the highest rate of grouping can reach 3.1 Mbit/s

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