A LOOK INSIDE A 3G CELL PHONE
Figure 8.14 shows the insides of a modern 3G cell phone. This one uses the WCDMA/HSPA 3G technology, but is also backward compatible with GSM/ EDGE if an area does not have 3G yet. There is a separate radio transceiver (XCVR) for each. All of the baseband functions like modulation and demodulation and handset management are handled by one or more processors. One processor may be DSP. This handset also has a Bluetooth radio for the head- set (not shown) and a Wi-Fi transceiver for Internet access via a wireless LAN access point or hot spot. These technologies will be covered in the next chapter. A GPS radio provides navigation as well as fulfills the E911 requirement. Note that all radios have separate antennas. A camera in included. The CCD is the charge-coupled device that converts the light and color variations in the scene into electrical signals. The stereo headphones are for the MP3 music player.
