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3G systems are much more taxing on components and modules than their 2G predecessors. One reason for this is the ever expanding set of requirements put forth by the 3GPP standards committees. W-CDMA differs from GSM in its frequency bands, modulation schemes, channel bandwidth, duplex spacing, power control, and on and on. Each of these system parameters comes with their own RF performance requirements and characteristics, such as sensitivity, higher order intercept points, phase noise, oscillator leakage, adjacent channel power leakage, and others.
Today, most of the 1G, 2G, 2.5G, and 3G technologies have a share of the market and there is a strong need for integration. Consequently, manufacturers need to produce mobiles that can operate on different networks in different parts of the world, which means user equipment (UE) must be able to operate in several different formats. The UE being produced today for global use must be able to cover a wide range of voice and high-speed data operations. For example, when a 3G network isn’t present, the UE must be able to connect to a 2G or 2.5G network.
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