Communication devices for generating and using a matrix-mapped sequence
A communication device for generating a matrix-mapped sequence is described. The communication device includes sequence generation circuitry. The communication device also includes mapping circuitry coupled to the sequence generation circuitry. The mapping circuitry applies a first matrix with at least one column multiplied by −1 to a sequence. The communication device also includes a transmit block coupled to the mapping circuitry.
1. A communication device for generating a matrix-mapped sequence, comprising:
mapping circuitry applying a first matrix to a sequence, wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j2
π
6
)
;
and
a transmit block coupled to the mapping circuitry for transmitting the sequence.
2. The communication device of claim 1 , wherein the first matrix is a discrete Fourier transform (DFT) matrix.
3. The communication device of claim 1 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.
4. The communication device of claim 1 , wherein the first matrix is applied to six sequences on five or six streams.
5. The communication device of claim 1 , wherein the mapping circuitry applies a second matrix to a pilot sequence, wherein the second matrix comprises a number of replicas of a first row of the first matrix.
6. The communication device of claim 1 , wherein the communication device is an access point.
7. The communication device of claim 1 , wherein the communication device is a station.
8. A communication device for using a matrix-mapped sequence, comprising: a receive block; wherein the receive block receives a sequence that is mapped according to a first matrix, wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j
2
π
6
)
;
channel estimation circuitry coupled to the receive block and configured only to receive a first signal that corresponds to the sequence, to estimate a channel from the first signal, and to produce a second signal that includes information about the estimate of the channel.
9. The communication device of claim 8 , wherein the first matrix is a discrete Fourier transform (DFT) matrix.
10. The communication device of claim 8 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.
11. The communication device of claim 8 , wherein the receive block receives six sequences that are mapped according to the first matrix with at least one column multiplied by −1.
12. The communication device of claim 8 , wherein the receive block receives a pilot sequence that is mapped according to a second matrix, wherein the second matrix comprises a number of replicas of a first row of the first matrix.
13. The communication device of claim 8 , wherein the communication device is an access point.
14. The communication device of claim 8 , wherein the communication device is a station.
15. The communication device of claim 8 , wherein the channel estimation circuitry estimates a channel based on the sequence.
16. The communication device of claim 8 , further comprising transmitter circuitry coupled to the channel estimation circuitry, wherein the transmitter circuitry transmits a channel estimate based on the sequence.
17. A method for generating a matrix-mapped sequence on a communication device, comprising:
applying, via a circuit, a first matrix to a sequence, wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j2
π
6
)
;
and
transmitting, via the circuit, the sequence.
18. The method of claim 17 , wherein the first matrix is a discrete Fourier transform (DFT) matrix.
19. The method of claim 17 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.
20. The method of claim 17 , wherein the first matrix is applied to six sequences on five or six streams.
21. The method of claim 17 , further comprising applying, via the circuit, a second matrix to a pilot sequence, wherein the second matrix comprises a number of replicas of a first row of the first matrix.
22. The method of claim 17 , wherein the communication device is an access point.
23. The method of claim 17 , wherein the communication device is a station.
24. A method for using a matrix-mapped sequence on a communication device, comprising:
receiving, via a circuit, a sequence that is mapped according to a first matrix, wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j
2
π
6
)
;
and estimating, via the circuit, a channel, wherein the circuit includes circuitry configured only to receive a first signal that corresponds to the sequence, to estimate a channel from the first signal, and to produce a second signal that includes information about the estimate of the channel.
25. The method of claim 24 , wherein the first matrix is a discrete Fourier transform (DFT) matrix.
26. The method of claim 24 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.
27. The method of claim 24 , wherein six sequences are received that are mapped according to the first matrix with at least one column multiplied by −1.
28. The method of claim 24 , further comprising receiving, via the circuit, a pilot sequence that is mapped according to a second matrix, wherein the second matrix comprises a number of replicas of a first row of the first matrix.
29. The method of claim 24 , wherein the communication device is an access point.
30. The method of claim 24 , wherein the communication device is a station.
31. The method of claim 24 , wherein the channel is estimated based on the sequence.
32. The method of claim 24 , further comprising transmitting, via the circuit, a channel estimate based on the sequence.
33. A computer-program product for generating a matrix-mapped sequence, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:
code for causing the communication device to apply a first matrix to a sequence, wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j2
π
6
)
;
and
code for causing the communication device to transmit the sequence.
34. The computer-program product of claim 33 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.
35. An apparatus for generating a matrix-mapped sequence, comprising:
means for applying a first matrix to a sequence, wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j2
π
6
)
;
and
means for transmitting the sequence.
36. The apparatus of claim 35 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.
37. An apparatus for using a matrix-mapped sequence, comprising: means for receiving a sequence that is mapped according to a first wherein the first matrix is given according to an equation
P
6
×
6
=
[
1
-
1
1
1
1
-
1
1
-
w
1
w
2
w
3
w
4
-
w
5
1
-
w
2
w
4
w
6
w
8
-
w
10
1
-
w
3
w
6
w
9
w
12
-
w
15
1
-
w
4
w
8
w
12
w
16
-
w
20
1
-
w
5
w
10
w
15
w
20
-
w
25
]
,
wherein P 6×6 is the first matrix and
w
=
exp
(
-
j2
π
6
)
;
and means for estimating a channel, wherein the means for estimating the channel includes circuitry configured only to receive a first signal that corresponds to the sequence, to estimate a channel from the first signal, and to produce a second signal that includes information about the estimate of the channel.
38. The apparatus of claim 37 , wherein the sequence is a Very High Throughput Long Training Field (VHT-LTF) sequence.