Coexistence schemes for wireless communication and sensing
Techniques are described for transmission and/or reception of signal structure designs for joint communications and sensing. An example wireless communication method includes transmitting, by a wireless device, a waveform that includes a signal structure having one or more time resources or one or more frequency resources, where the signal structure includes a plurality of data signals, where the signal structure includes a plurality of sensing signal configured to reflect from an object in an area where the wireless device is operating, and where, before the transmitting, the plurality of data signals are spread using different spreading codes than that used to spread the plurality of sensing signals.
1 . A wireless communication method, comprising:
transmitting, by a wireless device, a waveform that includes a signal structure,
wherein the signal structure includes a plurality of data signals,
wherein the signal structure includes a plurality of sensing signals configured to reflect from an object in an area where the wireless device is operating resulting in a reflected waveform that comprises at least some of the plurality of sensing signals to be received by the wireless device, and
wherein the plurality of data signals are spread using different spreading codes than that used to spread the plurality of sensing signals;
receiving, by the wireless device, the reflected waveform; and
determining, by processing the reflected waveform, one or more parameters of the object.
2 . The method of claim 1 , wherein the one or more parameters of the object include a distance between the object and the wireless device, a speed of the object, a motion period of the object, or an image of the object.
3 . The method of claim 1 ,
wherein the signal structure comprises a plurality of sub-carriers, and
wherein a first spreading code selected for a sensing signal is different than a second spreading code selected for a data signal.
4 . The method of claim 1 , wherein a plurality of spreading codes used to spread the plurality of data signals and the plurality of sensing signals are orthogonal.
5 . The method of claim 1 , wherein a plurality of spreading codes used to spread the plurality of data signals and the plurality of sensing signals include a discrete Fourier transform (DFT) matrix, a Hadamard code, a discrete Hartley transform matrix, a discrete cosine transform matrix, or a diagonal matrix.
6 . The method of claim 1 , wherein a plurality of spreading codes used to spread the plurality of data signals and the plurality of sensing signals are non-orthogonal.
7 . The method of claim 1 , wherein a set of spreading codes used to spread the plurality of sensing signals in a plurality of symbols are same.
8 . The method of claim 1 , wherein at least one symbol for a sensing signal is associated with a first spreading code that is different than a second spreading code associated with another sensing signal in at least one other symbol.
9 . The method of claim 1 , wherein a number of spreading codes used to spread the plurality of sensing signals in a plurality of symbols is same.
10 . The method of claim 1 , wherein at least one symbol for a sensing signal is associated with a first number of spreading codes that are different than a second number of spreading codes associated with another sensing signal in at least one other symbol.
11 . The method of claim 1 , wherein the plurality of sensing signals include frequency modulated continuous wave (FMCW), a pulse signal, or low-correlation sequences.
12 . The method of claim 11 , wherein the low-correlation sequence includes an m-sequence, a pseudo-noise sequence, a gold sequence, or a Zadoff-Chu sequence.
13 . The method of claim 1 , wherein the wireless device includes a network device or a communication device.
14 . An apparatus for wireless communication comprising at least one processor, configured to implement a method, the at least one processor configured to:
transmit, by a wireless device, a waveform that includes a signal structure,
wherein the signal structure includes a plurality of data signals,
wherein the signal structure includes a plurality of sensing signals configured to reflect from an object in an area where the wireless device is operating resulting in a reflected waveform that comprises at least some of the plurality of sensing signals to be received by the wireless device, and
wherein the plurality of data signals are spread using different spreading codes than that used to spread the plurality of sensing signals;
receive, by the wireless device, the reflected waveform; and
determine, by processing the reflected waveform, one or more parameters of the object.
15 . The apparatus of claim 14 , wherein the one or more parameters of the object include a distance between the object and the wireless device, a speed of the object, a motion period of the object, or an image of the object.
16 . The apparatus of claim 14 ,
wherein the signal structure comprises a plurality of sub-carriers, and
wherein a first spreading code selected for a sensing signal is different than a second spreading code selected for a data signal.
17 . The apparatus of claim 14 , wherein a plurality of spreading codes used to spread the plurality of data signals and the plurality of sensing signals are orthogonal.
18 . The apparatus of claim 14 , wherein a plurality of spreading codes used to spread the plurality of data signals and the plurality of sensing signals include a discrete Fourier transform (DFT) matrix, a Hadamard code, a discrete Hartley transform matrix, a discrete cosine transform matrix, or a diagonal matrix.
19 . The apparatus of claim 14 , wherein a plurality of spreading codes used to spread the plurality of data signals and the plurality of sensing signals are non-orthogonal.
20 . The apparatus of claim 14 , wherein a set of spreading codes used to spread the plurality of sensing signals in a plurality of symbols are same.