Direct Up-conversion Using an Fpga-based Polyphase Modem
نویسنده
چکیده
1. ABSTRACT Performance requirements for broadband modems continue to push the limits of analog technology. Fortunately, today’s digital–to-analog converters (DACs) are approaching sampling rates in the gigahertz range. These DACs allow broadband modems to implement multichannel solutions completely in the digital domain. To fully utilize the available bandwidth of these DACs, new techniques in modem design must be considered. Using polyphase decomposition and sub-sampling, a field programmable gate array (FPGA)-based modem can provide frequency synthesis for the full Nyquist bandwidth of the DAC. This paper describes an FPGA-based modem implementation using these techniques.
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