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Improving power amplifier efficiency in CDMA & WiMAX systems: efficient design and implementation of crest factor reduction and PA linearization solutions.(code-division multiple-access, Worldwide lnteroperability for Microwave Access)
Wireless Design & Development, January, 2007 by Chan, Clinton
WiMAX is an acronym for Worldwide lnteroperability for Microwave Access, a certification mark for products that pass conformity and interoperability tests for the IEEE 802.16 standards. The WiMAX Forum, formed in 2001, describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL".
The orthogonal frequency division multiplexing (OFDM)-based WiMAX 802.16e standard is expected to offer higher data rates compared to the current 3G technologies. To achieve this goal, the transmitter chain must transmit with high fidelity and power to cover a large area utilizing only a few cell sites. This puts high demand on power amplifier (PA) performance. However, the nature of code-division...
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