Measurement signals for sensing
A method is disclosed of a transmitter configured to transmit a physical layer packet comprising a plurality of measurement signals for channel estimation. The method includes configuring the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation, and transmitting the physical layer packet. In some embodiments, at least one of the plurality of measurement signals for channel estimation occurs outside of a preamble of the physical layer packet (e.g., in a midamble). A method of a corresponding receiver is also disclosed. Corresponding apparatuses, wireless communication device, and computer program product are also disclosed.
1. A method of a transmitter configured to transmit a physical layer packet comprising a plurality of measurement signals for channel estimation, the method comprising:
configuring the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation; and
transmitting the physical layer packet;
the physical layer packet including a preamble and a data field, the data field including a plurality of midambles, each midamble including at least one measurement signal of the plurality of measurement signals for channel estimation, the different precoding settings being used for at least two midambles of the plurality of midambles, each one of the at least two midambles in the data field of the physical layer packet being different from each other and corresponding to a different beam characteristic.
2. The method of claim 1 , wherein the transmitter is configured to use different precoding settings for at least three of the plurality of measurement signals for channel estimation.
3. The method of claim 1 , wherein at least one of the plurality of measurement signals for channel estimation is included in the preamble of the physical layer packet.
4. The method of claim 3 , wherein a precoding setting used for at least one other measurement signal that occurs outside of the preamble differs from all precoding settings used for measurement signals comprised in the preamble.
5. The method of claim 1 , wherein at least one other measurement signal of the plurality of measurement signals for channel estimation occurs outside of the preamble of the physical layer packet.
6. The method of claim 1 , wherein at least one of the plurality of measurement signals for channel estimation is comprised in a packet extension of the physical layer packet.
7. The method of claim 1 , wherein configuring the different precoding settings for at least two of the plurality of measurement signals for channel estimation comprises configuring the precoding settings in accordance with a precoding setting pattern.
8. The method of claim 7 , wherein the precoding setting pattern provides uniform selection from the collection of precoding settings for WLAN sensing.
9. The method of claim 7 , wherein the precoding setting pattern provides non-uniform selection from the collection of precoding settings for WLAN sensing.
10. The method of claim 1 , wherein the different precoding settings are selected from a collection of precoding settings for wireless local area network (WLAN) sensing.
11. The method of claim 1 , further comprising transmitting a precoding setting announcement.
12. The method of claim 11 , wherein the precoding setting announcement is indicative of one or more of:
configured precoding settings;
the configured precoding settings for one or more of the measurement signals for channel estimation; and
which measurement signals for channel estimation have a same precoding setting.
13. The method of claim 11 , wherein the precoding setting announcement is comprised in one or more of: a broadcast signal, a beacon signal, a receiver-dedicated signal, a header field of the physical layer packet, and a medium access control header field associated with the physical layer packet.
14. The method of claim 1 , further comprising receiving a precoding setting request for measurement signals for channel estimation, and selecting the different precoding settings based on the request.
15. The method of claim 1 , wherein the physical layer packet is a physical layer (PHY) protocol data unit (PPDU), or a high efficiency (HE) PPDU, or an extremely high throughput (EHT) PPDU.
16. The method of claim 1 , wherein the measurement signal for channel estimation comprises one or more of: a long training field (LTF), a HE-LTF, and a EHT-LTF.
17. The method of claim 1 , wherein the transmitter is configured to transmit the physical layer packet in accordance with a listen-before-talk procedure.
18. A method of a receiver, the method comprising:
receiving a physical layer packet, the physical layer packet including a plurality of measurement signals for channel estimation, a preamble, and a data field, different precoding settings being used for at least two of the plurality of measurement signals for channel estimation, the data field including a plurality of midambles, each midamble including at least one measurement signal of the plurality of measurement signals for channel estimation, the different precoding settings being used for at least two midambles of the plurality of midambles, each one of the at least two midambles in the data field of the physical layer packet being different from each other and corresponding to a different beam characteristic; and
performing channel estimation based on the measurement signals for channel estimation.
19. An apparatus for a transmitter configured to transmit a physical layer packet comprising a plurality of measurement signals for channel estimation, the apparatus comprising controlling circuitry configured to cause:
configuration of the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation; and
transmission of the physical layer packet;
the physical layer packet including a preamble and a data field, the data field including a plurality of midambles, each midamble including at least one measurement signal of the plurality of measurement signals for channel estimation, different precoding settings being used for at least two midambles of the plurality of midambles, each one of the at least two midambles in the data field of the physical layer packet being different from each other and corresponding to a different beam characteristic.