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US 8,913,515 B2Granted
Measuring and improving multiuser downlink reception quality in wireless local area networks
AssigneeMediaTek Singapore Pte. Ltd.
InventorsRavishankar H. Mahadevappa, Thomas E. Pare, Jr., Kiran Uln
Life of this patent
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Abstract
Embodiments for improving multi-user downlink reception quality in WLANS are disclosed. In one embodiment, a method includes receiving, at a station, at least one multi-user sounding packet from an access point. The method also includes determining a sum of desired signal strengths from the at least one received sounding packet. The method also includes determining a sum of interference signal strengths from the at least one received sounding packet. The method also includes generating link quality metrics based on a ratio of the sum of desired signal strengths to the sum of interference signal strengths.
Claims17
A method comprising:
- receiving, at a plurality of stations, at least one multi-user sounding packet from an access point;
- determining a sum of desired signal strengths from the at least one received multi-user sounding packet by each of the plurality of stations;
- determining a sum of interference signal strengths from the at least one received multi-user sounding packet by each of the plurality of stations;
- and
- generating multi-user multiple-input and multiple-output link quality metrics based on a ratio of the sum of desired signal strengths to the sum of interference signal strengths,
- wherein the generating of the link quality metrics is based on the following equation:
- MLQ
- k
- ,
- i
-
- (
- n
- )
- =
- 10
-
-
- log
- 10
-
- (
- ∑
- p
- ∈
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- ∑
- p
- ∉
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- )
- wherein MLQk,i is a multi-user (MU) multiple-input and multiple-output (MIMO) link quality for a subcarrier k, NSTS,i is a number of receiver antennas, and wherein Ŝ is a signal strength.
67 more elements
A method comprising:
- receiving, at a plurality of stations, at least one multi-user sounding packet from an access point;
- determining a sum of desired signal strengths from the at least one received multi-user sounding packet by each of the plurality of stations;
- determining a sum of interference signal strengths from the at least one received multi-user sounding packet by each of the plurality of stations;
- and
- generating multi-user multiple-input and multiple-output link quality metrics based on a ratio of the sum of desired signal strengths to the sum of interference signal strengths,
- wherein the generating of the link quality metrics is based on the following equation:
- MLQ
- i
-
- (
- n
- )
- =
- 10
-
-
- log
- 10
-
- (
- ∑
- k
- =
- 1
- N
- sc
-
- ∑
- p
- ∈
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- ∑
- k
- =
- 1
- N
- sc
-
- ∑
- p
- ∉
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- )
- wherein MLQi is a multi-user (MU) multiple-input and multiple-output (MIMO) link quality for user i, NSTS,i is a number of receiver antennas, and wherein Ŝ is a signal strength.
79 more elements
A method comprising:
- transmitting, from an access point, at least one multi-user sounding packet to each station of a plurality of stations;
- and
- receiving multi-user multiple-input and multiple-output link quality metrics from each of the stations, wherein the multi-user multiple-input and multiple-output link quality metrics are based on a ratio of a sum of desired signal strengths to a sum of interference signal strengths,
- wherein the link quality metrics are generated based on the following equation:
- MLQ
- k
- ,
- i
-
- (
- n
- )
- =
- 10
-
-
- log
- 10
-
- (
- ∑
- p
- ∈
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- ∑
- p
- ∉
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- )
- wherein MLQk,i is a multi-user (MU) multiple-input and multiple-output (MIMO) link quality for a subcarrier k, NSTS,i is a number of receiver antennas, and wherein Ŝ is a signal strength.
65 more elements
A method comprising:
- transmitting, from an access point, at least one multi-user sounding packet to each station of a plurality of stations;
- and
- receiving multi-user multiple-input and multiple-output link quality metrics from each of the stations, wherein the multi-user multiple-input and multiple-output link quality metrics are based on a ratio of a sum of desired signal strengths to a sum of interference signal strengths, wherein the link quality metrics are generated based on the following equation:
- MLQ
- i
-
- (
- n
- )
- =
- 10
-
-
- log
- 10
-
- (
- ∑
- k
- =
- 1
- N
- sc
-
- ∑
- p
- ∈
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- ∑
- k
- =
- 1
- N
- sc
-
- ∑
- p
- ∉
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- )
- wherein MLQi is a multi-user (MU) multiple-input and multiple-output (MIMO) link quality for user i, NSTS,i is a number of receiver antennas, and wherein Ŝ is a signal strength.
76 more elements
An system comprising:
- a processor;
- and
- a storage device storing one or more stored sequences of instructions which when executed by the processor cause the processor to:
- transmit, from a transmission device, a plurality of multi-user sounding packets to a plurality of stations;
- and
- receive multi-user multiple-input and multiple-output link quality metrics from each of the stations, wherein the multi-user multiple-input and multiple-output link quality metrics are based on a ratio of a sum of desired signal strengths to a sum of interference signal strengths,
- wherein the link quality metrics are generated based on the following equation:
- MLQ
- k
- ,
- i
-
- (
- n
- )
- =
- 10
-
-
- log
- 10
-
- (
- ∑
- p
- ∈
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- ∑
- p
- ∉
- STS
-
- (
- i
- )
-
-
- S
- ^
- k
- ,
- i
-
- (
- n
- ,
- p
- )
-
- 2
- )
- wherein MLQk,i is a multi-user (MU) multiple-input and multiple-output (MIMO) link quality for a subcarrier k, NSTS,i is a number of receiver antennas, and wherein Ŝ is a signal strength.
68 more elements
Dependencies are inferred from the claim text.