Designing digital radios always has been a challenge for com-munications systems. As the demand for higher and higher data rates from triple play (voice, video, and data) applications have made their way into the mainstream, radio design requirements also have greatly increased. Network providers are looking to increase reliability and quality of service (QoS) of mobile communications using diversity, or multiple-input/multiple-out put (MIMO). These concepts are not new, but the advances made in analog-to-digital (ADC) and digital-to-analog (DAC) converters, as well as radio frequency (RF) semiconductor design technologies, make implementing these techniques feasible.
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