Sub-Nyquist Sampling OFDM Radar With a Time-Frequency Phase-Coded Waveform
arxiv(2024)
摘要
This paper presents a time-frequency phase-coded sub-Nyquist sampling
orthogonal frequency division multiplexing (PC-SNS-OFDM) radar system to reduce
the analog-to-digital converter (ADC) sampling rate without any additional
hardware or signal processing. The proposed radar divides the transmitted OFDM
signal into multiple sub-bands along the frequency axis and provides
orthogonality to these sub-bands by multiplying phase codes in both the time
and frequency domains. Although the sampling rate is reduced by the factor of
the number of sub-bands, the sub-bands above the sampling rate are folded into
the lowest one due to aliasing. In the process of restoring the signals in
folded sub-bands to those in full signal bands, the proposed PC-SNS-OFDM radar
effectively eliminates symbol-mismatch noise while introducing trade-offs in
the range and Doppler ambiguities. The utilization of phase codes in both the
frequency and time domains provides flexible control of the range and Doppler
ambiguities. It also improves the signal-to-noise ratio (SNR) of detected
targets compared to an earlier sub-Nyquist sampling OFDM radar system. This is
validated with simulations and experiments under various sub-Nyquist sampling
rates.
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