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Radio Frequency (RF) subsampling can be used by radio receivers to directly down-convert and digitize RF signals. A goal of a Cognitive Radio/Software Defined Ratio (CR/SDR) receiver design is to place the Analog-to-Digital Converter (ADC) as near the antenna as possible. Based on this, a band-pass sampling (BPS) frontend for CR/SDR is proposed and verified. The authors present a receiver architecture based second-order BPS and signal processing techniques for a digital RF frontend. This paper is focused on the benefits of the second-order BPS architecture in spectrum sensing over a wide frequency band range and in multiband receiving without modification of the RF hardware.
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