A METHOD OF PROCESSING WIRELESS COMMUNICATION SIGNALS FOR USE IN RADAR SENSING
Wireless communication signals are used in radar sensing. Wireless communication signals are processed by receiving a reflected communication signal, the reflected communication signal being a sent communication signal including a sent preamble part and a sent data payload, that is reflected off of at least one object. Accordingly, the reflected communication signal includes a corresponding reflected preamble part and a reflected data payload. The method further includes determining a first radar ambiguity function for the reflected preamble part of the reflected communication signal, and determining a second radar ambiguity function for the reflected data payload of the reflected communication signal. The first and the second radar ambiguity functions are combined, using a point-wise minimum selection, for obtaining a combined radar ambiguity function.
1 . A method of processing wireless communication signals for use in radar sensing, comprising:
receiving a reflected communication signal, wherein the reflected communication signal is a reflection of a sent communication signal comprising a sent preamble part and a sent data payload, reflected off of at least one object, wherein the reflected communication signal comprises a corresponding reflected preamble part and a reflected data payload,
determining a first radar ambiguity function for the reflected preamble part of the reflected communication signal,
determining a second radar ambiguity function for the reflected data payload of the reflected communication signal,
combining the first and the second radar ambiguity functions using a point-wise minimum selection, for obtaining a combined radar ambiguity function.
2 . The method of claim 1 , wherein the wireless communication signal is an OFDM transmission frame having a single-carrier preamble comprising a short training field and a channel estimation field, wherein the first radar ambiguity function for the reflected preamble part of the reflected communication signal is determined based on both the short training field and the channel estimation field of the single-carrier preamble.
3 . The method of claim 1 , wherein the wireless communication signal is an OFDM transmission frame having a plurality of OFMD data transmission blocks, each OFDM data transmission block having a cyclic prefix, wherein, for determining the second radar ambiguity function for the reflected data payload of the reflected communication signal, the cyclic prefix of the reference signal is set to zero.
4 . The method of claim 1 , wherein the squares of the respective absolute values of the first radar ambiguity function and the second radar ambiguity function are subjected to the point-wise minimum selection, for obtaining the combined radar ambiguity function.
5 . The method of claim 1 , wherein determining the first radar ambiguity function for the reflected preamble part of the reflected communication signal comprises setting the data payload in a delayed and Doppler-shifted copy of the sent communication signal to zero, prior to comparing it with the reflected preamble part of the reflected communication signal.
6 . The method of claim 1 , wherein determining the second radar ambiguity function for the reflected data payload of the reflected communication signal comprises setting the preamble part in a delayed and Doppler-shifted copy of the sent communication signal to zero, prior to comparing it with the reflected data payload of the reflected communication signal.
7 . The method of claim 1 , wherein determining the first and/or the second radar ambiguity function comprises applying a matched filter or a bank of correlators.
8 . The method of claim 1 , further comprising extracting a delay information and/or a velocity information of the at least one object from the combined radar ambiguity function.
9 . The method of claim 1 , wherein the frequency of the sent communication signal is within a radar frequency range, including a frequency range between 30 GHz and 300 GHz, particularly between 50 and 150 GHz, for instance between 57 GHz and 71 GHz.
10 . (canceled)
11 . A non-transitory computer-readable storage medium having stored thereon computer-executable instructions that, when executed, cause performance of operations comprising:
receiving a reflected communication signal, wherein the reflected communication signal is a reflection of a sent communication signal comprising a sent preamble part and a sent data payload, reflected off of at least one object, wherein the reflected communication signal comprises a corresponding reflected preamble part and a reflected data payload,
determining a first radar ambiguity function for the reflected preamble part of the reflected communication signal,
determining a second radar ambiguity function for the reflected data payload of the reflected communication signal,
combining the first and the second radar ambiguity functions using a point-wise minimum selection, for obtaining a combined radar ambiguity function.
12 . A receiver for a joint radar and wireless communication, JRC, configured for performing operations comprising:
receiving a reflected communication signal, wherein the reflected communication signal is a reflection of a sent communication signal comprising a sent preamble part and a sent data payload, reflected off of at least one object, wherein the reflected communication signal comprises a corresponding reflected preamble part and a reflected data payload,
determining a first radar ambiguity function for the reflected preamble part of the reflected communication signal,
determining a second radar ambiguity function for the reflected data payload of the reflected communication signal,
combining the first and the second radar ambiguity functions using a point-wise minimum selection, for obtaining a combined radar ambiguity function.
13 . The receiver of claim 12 , wherein the receiver is co-located to a transmitter configured for sending the communication signal.
14 . The receiver of claim 13 , wherein the receiver comprises a low noise amplifier, LNA, and/or a mixer configured for building an intermediate frequency, particularly the same oscillator signal as the transmitter.
15 . (canceled)
16 . (canceled)
17 . (canceled)
18 . The non-transitory computer-readable storage medium of claim 11 , wherein the wireless communication signal is an OFDM transmission frame having a single-carrier preamble comprising a short training field and a channel estimation field, wherein the first radar ambiguity function for the reflected preamble part of the reflected communication signal is determined based on both the short training field and the channel estimation field of the single-carrier preamble.
19 . The non-transitory computer-readable storage medium of claim 11 , wherein the wireless communication signal is an OFDM transmission frame having a plurality of OFMD data transmission blocks, each OFDM data transmission block having a cyclic prefix, wherein, for determining the second radar ambiguity function for the reflected data payload of the reflected communication signal, the cyclic prefix of the reference signal is set to zero.
20 . The non-transitory computer-readable storage medium of claim 11 , wherein the squares of the respective absolute values of the first radar ambiguity function and the second radar ambiguity function are subjected to the point-wise minimum selection, for obtaining the combined radar ambiguity function.
21 . The receiver of claim 12 , wherein the wireless communication signal is an OFDM transmission frame having a single-carrier preamble comprising a short training field and a channel estimation field, wherein the first radar ambiguity function for the reflected preamble part of the reflected communication signal is determined based on both the short training field and the channel estimation field of the single-carrier preamble.
22 . The receiver of claim 12 , wherein the wireless communication signal is an OFDM transmission frame having a plurality of OFMD data transmission blocks, each OFDM data transmission block having a cyclic prefix, wherein, for determining the second radar ambiguity function for the reflected data payload of the reflected communication signal, the cyclic prefix of the reference signal is set to zero.
23 . The receiver of claim 12 , wherein the squares of the respective absolute values of the first radar ambiguity function and the second radar ambiguity function are subjected to the point-wise minimum selection, for obtaining the combined radar ambiguity function.