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Chapter 8. Cell Phones > Digital Modulation and Wireless Transmission Methods - Pg. 191

Chapter | 8 Cell Phones 191 Long-Term Evolution --Long-Term Evolution (LTE) is the next or fourth- generation (4G) cell phone technology. It is just now being implemented. It is appearing in Europe first and the United States later. It uses an entirely different radio technology called orthogonal frequency division multiplexing (OFDM) to give even higher data rates up to 100 Mbps. More on that later. How can you tell which of the above phone technologies you have? You cannot tell by the manufacturer, such as RIM BlackBerry, Samsung, LG, Motorola, Nokia, Sony Ericsson, and so on, because they all make multiple types. However, a few clues follow. Carriers AT&T and T-Mobile provide GSM/WCDMA phones. Most also have some form of HSPA. These carriers will eventually morph their systems to LTE. Carriers Sprint and Verizon use cdma2000 phones. Most phones today are also what we call multimode phones in that they incorporate two or more dif- ferent technologies. The most common combination is GSM/WCDMA/HSPA. DIGITAL MODULATION AND WIRELESS TRANSMISSION METHODS In Chapter 7, basic digital modulation methods ASK/OOK and FSK were cov-