Single-frequency measurements using undersampling methods
Chia, Eng S.
Pace, Phillip E.
Schleher, D. Curtis
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The objective of this study is to verify the Symmetrical Number System (SNS) undersampling receiver architecture using software and to investigate implementation issues using digital signal processing (DSP) hardware. In the software design, a MATLAB program is written to determine a single sinusoidal input frequency using this receiver architecture. Each channel of the SNS undersampling receiver consists of a low speed ADC, a discrete Fourier transform followed by a constant threshold device to detect the signal's frequency bin. The detected frequency bins are then recombined in a SNS-to-decimal algorithm to recover the frequency of the signal. Error rate performance in a Gaussian noise environment at the input stage is evaluated. In the hardware design, a sinusoidal waveform is digitized, discrete Fourier transformed and converted from the SNS format to a decimal value using a single channel digital signal processor. Implementation difficulties and design issues are discussed
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