Increasing the robustness of channel estimates derived through sounding for WLAN
View Patent ↗A plurality of training signal sets are transmitted. Each training signal set includes information sufficient to determine a channel estimate corresponding to a communication channel from a first station to a second station. A refined channel estimate is determined based on reception of the plurality of training signal sets.
1. An apparatus comprising:
a hardware device configured to
generate a plurality of individual channel estimates based on a plurality of received training signal sets received from a first wireless transceiver, wherein each received training signal set includes information sufficient to determine a channel estimate corresponding to a first communication channel from the first wireless transceiver to a second wireless transceiver, and
determine a refined channel estimate based on a mathematical combination of the plurality of individual channel estimates.
2. An apparatus according to claim 1 , wherein the refined channel estimate is an estimate of a second communication channel from the second wireless transceiver to the first wireless transceiver, and wherein the hardware device is configured to:
determine, based on the plurality of received training signal sets, an intermediate refined channel estimate of the first communication channel; and
determine the estimate of the second communication channel based on the intermediate refined channel estimate.
3. An apparatus according to claim 1 , wherein the hardware device is configured to determine the refined channel estimate based on a weighted combination of the plurality of individual channel estimates.
4. An apparatus according to claim 3 , wherein the hardware device is configured to weight the plurality of individual channel estimates with a plurality of different weights.
5. An apparatus according to claim 1 , wherein the hardware device is configured to determine the refined channel estimate iteratively after each received training signal set is received.
6. An apparatus according to claim 5 , wherein the hardware device is configured to utilize, after each training signal set is received, the iteratively determined refined channel estimate to process a wireless communication signal.
7. An apparatus according to claim 1 , wherein the hardware device is configured to utilize, only after the plurality of received training signal sets has been received, the refined channel estimate to process a wireless communication signal.
8. An apparatus according to claim 1 , wherein the hardware device is configured to cause a packet to be transmitted to the first wireless transceiver, wherein the packet includes a request to transmit the plurality of training signal sets.
9. An apparatus according to claim 1 , wherein the hardware device is configured to cause a plurality of packets to be transmitted to the first wireless transceiver, wherein each packet in the plurality of packets includes a request to transmit a respective one of the plurality of training signal sets.
10. An apparatus according to claim 1 , wherein the hardware device is configured to cause the refined channel estimate to be transmitted to the first wireless transceiver.
11. An apparatus according to claim 1 , wherein the hardware device is configured to utilize the refined channel estimate to perform at least one of (i) beamsteering or (ii) selecting a modulation and coding scheme for transmitting a signal.
12. An apparatus according to claim 11 , wherein the hardware device is configured to utilize the refined channel estimate to perform equalization of a received signal.
13. An apparatus comprising:
a hardware device configured to
cause a plurality of training signal sets to be transmitted from a first wireless transceiver to a second wireless transceiver, wherein each training signal set includes information sufficient to determine a channel estimate corresponding to a communication channel from the first wireless transceiver to the second wireless transceiver; and
generate a refined channel estimate based on a mathematical combination of a plurality of respective individual channel estimates received from the second wireless transceiver in response to each of the plurality of training signal sets.
14. An apparatus according to claim 13 , wherein the hardware device is configured to determine the refined channel estimate based on a weighted combination of the plurality of individual channel estimates.
15. An apparatus according to claim 14 , wherein the hardware device is configured to weight the plurality of individual channel estimates with a plurality of different weights.
16. An apparatus according to claim 13 , wherein the hardware device is configured to determine the refined channel estimate iteratively after each individual channel estimate is received.
17. An apparatus according to claim 16 , wherein the hardware device is configured to utilize, after each individual channel estimate is received, the iteratively determined refined channel estimate to process a wireless communication signal.
18. An apparatus according to claim 13 , wherein the hardware device is configured to utilize, only after the plurality of individual channel estimates has been received, the refined channel estimate to process a wireless communication signal.
19. An apparatus according to claim 13 , wherein the hardware device is configured to
determine a signal-to-noise ratio (SNR) associated with the communication channel, and
cause the plurality of training signal sets to be transmitted only if it is determined that the SNR meets a criterion.
20. An apparatus according to claim 13 , wherein the hardware device is configured to utilize the refined channel estimate to perform at least one of (i) beamsteering or (ii) selecting a modulation and coding scheme for transmitting a signal.