System and method for performing orthogonal frequency-division multiplexing (OFDM) based radar detection
AssigneeImec Vzw
InventorsAndre Bourdoux, Marc Bauduin, Claude Desset
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Abstract
An orthogonal frequency-division multiplexing (OFDM) based radar signal comprising Q sub-carriers adapted to push an IQ-imbalance component out of a subset of L contiguous range bins of range profiles derived out of the received radar signal and wherein L is at most Q/2, is disclosed.
Claims15
An orthogonal frequency-division multiplexing (OFDM) based radar system, comprising:
- a transmit circuit configured to transmit an OFDM based radar signal comprising Q sub-carriers adapted to push an IQ-imbalance component out of a subset of L contiguous range bins of range profiles derived out of the received radar signal, wherein L is at most Q/2;
- and
- a receive circuit configured to receive a reflected radar signal based on the transmitted OFDM based radar signal, and
- a circuitry configured to perform an inverse Fourier transform to obtain the range profiles in a time domain (TD).
An OFDM based radar system comprising:
- a transmit circuit configured to transmit an OFDM based radar signal comprising Q sub-carriers adapted to push an IQ-imbalance component out of a subset of L contiguous range bins of range profiles derived out of the received radar signal, wherein L is at most Q/2;
- and
- a receive circuit configured to receive a reflected radar signal based on the transmitted OFDM based radar signal, wherein a Hadamard product of:
- a) an inverse or complex conjugate transpose of a sequence of the Q sub-carriers represented in a frequency domain (FD) sequence and b) a complex conjugate of the FD sequence, wherein the order of subcarriers of the FD sequence is reversed,
- is orthogonal to 2L-1 subcarriers centered around a direct current (DC) subcarrier of a Fourier transformation matrix indicative of a relationship between a time domain (TD) and FD representation of the OFDM based radar signal.
A method for generating the OFDM based radar signal, which comprises Q sub-carriers adapted to push an IQ-imbalance component out of a subset of L contiguous range bins of range profiles derived out of the received radar signal, wherein L is at most Q/2, the method comprising:
- providing a sequence of Q frequency domain (FD) OFDM subcarriers such that a Hadamard product of a) an inverse or complex conjugate transpose of a sequence of the Q sub-carriers represented in a FD sequence and b) a complex conjugate of the FD sequence wherein the order of subcarriers of the FD sequence is reversed, is orthogonal to the 2L-1 subcarriers centered around a direct current (DC) subcarrier of a Fourier transformation matrix indicative for the relation between a time domain (TD) and FD representation of the OFDM radar signal;
- and
- transforming the sequence from the FD to the TD based on the Fourier transformation matrix, thereby obtaining the radar signal.
Dependencies are inferred from the claim text.