The advent of powerful multicore processors has enabled this approach to SDR. With a multicore processor, the software flexibility required by SDR can be pushed inside the main application processor, where one core can be dedicated to each standard. This simplifies the radio design and reduces cost by more efficiently utilizing the multicore application processor already present in the system.
Flexibility and scalability
The proposed WBR architecture makes a true SDR possible and is highly flexible and scalable. In the example below (Figure 4) a typical car radio employees three WBR tuner integrated circuits (ICs): one for the main station, one for background scan (searching for alternate frequencies), and one for phase diversity.
MAX2175 World Band Radio receiver
The MAX2175 IC is an advanced RF to Bits automotive radio tuner. This highly integrated tuner uses direct conversion for digital audio broadcast (DAB) and digital multimedia broadcast (DMB) applications, covering VHF Band-III and L-Band. Reception of FM, DRM+, FM-HD, and Weather-Band is supported using a Low-IF and digital conversion to baseband. AM (LW, MW, and SW) and DRM reception is supported using direct sampling and digital conversion to baseband (Figure 5).