SDR Baseband Processing - Flexible and Cost-Effective
Software Defined Radio (SDR) performs baseband processing in software, enabling a single radio platform to receive various radio standards. This approach is essential for systems like intelligent multimedia touchscreen systems in automobiles. In contrast, traditional radio receivers require as many radio receiver chips as there are radio standards.
The SDR methodology can be used to implement all signal processing that occurs after the Analog-to-Digital Converter (ADC). To simplify design and improve efficiency, certain functions can be implemented in hardware within the front end. For simpler interfaces, you can implement decimation, which reduces the bandwidth required for the interface between the front-end device and the SDR processor. However, any signal processing assigned to the front end must be sufficiently adaptable so as not to compromise the flexibility of the SDR back end. Ideally, in an SDR implementation, signal processing specific to a particular standard should be realized using SDR technology. This allows a single radio front end to be used with various broadcast standards through SDR software.
Although baseband processing can be implemented in software with SDR, the software must still run on a hardware platform. In one possible approach, two baseband signal processing cores, each with its own front end for AM and FM, could be placed on the same chip. However, since there are far more standards than just these two, this type of architecture does not fully support the SDR strategy. To fully realize the intent of SDR, a more flexible architecture is required.
SDR Baseband Processing - Flexible and Cost-Effective
by mario.wang@sdruav.com | Classroom
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