US 8,971,439 B2Granted

Precoding method, precoding device

AssigneePanasonic Intellectual Property Corporation of America

InventorsYutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi

Life of this patent

Estimating the term…

Abstract

Disclosed is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals that are transmitted in the same frequency bandwidth at the same time. According to the precoding method, one matrix is selected from among matrices defining a precoding process that is performed on the plurality of baseband signals by hopping between the matrices. A first baseband signal and a second baseband signal relating to a first coded block and a second coded block generated by using a predetermined error correction block coding scheme satisfy a given condition.

Claims4

Dependent claims

A transmission method for generating a plurality of transmission signals and transmitting the plurality of transmission signals from a plurality of antennas in the same frequency at the same time, the transmission method comprising, in the generation of the plurality of transmission signals, the steps of:

selecting one matrix from among N matrices F[i] by hopping between the matrices, for each of a plurality of slots, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, the N matrices F[i] each defining a precoding process that is performed on a plurality of baseband signals;
generating a first coded block and a second coded block from transmission data by using a predetermined error correction block coding scheme;
performing a precoding process that corresponds to the selected matrix on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in the first coded block, thereby generating a first precoded signal z1 and a second precoded signal z2;
and
performing a precoding process that corresponds to the selected matrix on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in the second coded block, thereby generating a first precoded signal z1 and a second precoded signal z2, wherein
the first precoded signals z1 and the second precoded signals z2 satisfy (z1, z2)T=F[i] (s1, s2)T,
the N matrices F[i] satisfy:
F
⁡
[
i
]
=
1
α
2
+
1
⁢
(
ⅇ
jθ
11
⁡
(
i
)
α
×
ⅇ
j
⁡
(
θ
11
⁡
(
i
)
+
λ
)
α
×
ⅇ
jθ
21
⁡
(
i
)
ⅇ
j
⁡
(
θ
21
⁡
(
i
)
+
λ
+
π
)
)
where λ represents an arbitrary angle, α represents a positive real number other than 1, θ11(i) and θ21(i) satisfy:
ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
where x and y are any integers no less than 0 and no more than N−1 satisfying x≠y, and
a matrix selected for the first slot in the first coded block is the same as a matrix selected for the first slot in the second coded block.

68 more elements

A transmission apparatus for generating a plurality of transmission signals and transmitting the plurality of transmission signals from a plurality of antennas in the same frequency at the same time, the transmission apparatus comprising:

a weighting information generating unit configured to select one matrix from among N matrices F[i] by hopping between the matrices, for each of a plurality of slots, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, the N matrices F[i] each defining a precoding process that is performed on a plurality of baseband signals;
an error correction coding unit configured to generate a first coded block and a second coded block from transmission data by using a predetermined error correction block coding scheme;
and
a weighting unit configured to
perform a precoding process that corresponds to the selected matrix on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in the first coded block, thereby generating a first precoded signal z1 and a second precoded signal z2;
and
perform a precoding process that corresponds to the selected matrix on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in the second coded block, thereby generating a first precoded signal z1 and a second precoded signal z2, wherein
the first precoded signals z1 and the second precoded signals z2 satisfy (z1, z2)T =F[i] (s1, s2)T,
the N matrices F[i] satisfy:
F
⁡
[
i
]
=
1
α
2
+
1
⁢
(
ⅇ
jθ
11
⁡
(
i
)
α
×
ⅇ
j
⁡
(
θ
11
⁡
(
i
)
+
λ
)
α
×
ⅇ
jθ
21
⁡
(
i
)
ⅇ
j
⁡
(
θ
21
⁡
(
i
)
+
λ
+
π
)
)
where λ represents an arbitrary angle, α represents a positive real number other than 1, θ11(i) and θ21(i) satisfy:
ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
where x and y are any integers no less than 0 and no more than N−1 satisfying x≠y, and
a matrix selected for the first slot in the first coded block is the same as a matrix selected for the first slot in the second coded block.

70 more elements

A reception method comprising the step of:

acquiring a received signal obtained by receiving a plurality of signals transmitted from a plurality of antennas in the same frequency at the same time, wherein
the plurality of signals include:
a signal being transmitted based on a first precoded signal z1 and a second precoded signal z2 that are generated by performing a precoding process that uses one matrix selected from among N matrices F[i] by hopping between the matrices, for each of a plurality of slots, on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in a first coded block, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater;
and
a signal being transmitted based on a first precoded signal z1 and a second precoded signal z2 that are generated by performing a precoding process that uses one matrix selected from among the N matrices F[i] by hopping between the matrices, for each of a plurality of slots, on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in a second coded block, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater,
the first coded block and the second coded block are generated from transmission data by using a predetermined error correction block coding scheme,
the first precoded signals z1 and the second precoded signals z2 satisfy (z1, z2)T=F[i] (s1, s2)T,
the N matrices F[i] satisfy:
F
⁡
[
i
]
=
1
α
2
+
1
⁢
(
ⅇ
jθ
11
⁡
(
i
)
α
×
ⅇ
j
⁡
(
θ
11
⁡
(
i
)
+
λ
)
α
×
ⅇ
jθ
21
⁡
(
i
)
ⅇ
j
⁡
(
θ
21
⁡
(
i
)
+
λ
+
π
)
)
where λ represents an arbitrary angle, α represents a positive real number other than 1, θ11(i) and θ21(i) satisfy:
ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
where x and y are any integers no less than 0 and no more than N−1 satisfying x≠y, and
a matrix selected for the first slot in the first coded block is the same as a matrix selected for the first slot in the second coded block.

69 more elements

A reception apparatus comprising:

a received signal acquisition unit configured to acquire a received signal obtained by receiving a plurality of signals transmitted from a plurality of antennas in the same frequency at the same time, wherein
the plurality of signals include:
a signal being transmitted based on a first precoded signal z1 and a second precoded signal z2 that are generated by performing a precoding process that uses one matrix selected from among N matrices F[i] by hopping between the matrices, for each of a plurality of slots, on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in a first coded block, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater;
and
a signal being transmitted based on a first precoded signal z1 and a second precoded signal z2 that are generated by performing a precoding process that uses one matrix selected from among the N matrices F[i] by hopping between the matrices, for each of a plurality of slots, on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in a second coded block, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater,
the first coded block and the second coded block are generated from transmission data by using a predetermined error correction block coding scheme,
the first precoded signals z1 and the second precoded signals z2 satisfy (z1, z2)T=F[i] (s1, s2)T,
the N matrices F[i] satisfy:
F
⁡
[
i
]
=
1
α
2
+
1
⁢
(
ⅇ
jθ
11
⁡
(
i
)
α
×
ⅇ
j
⁡
(
θ
11
⁡
(
i
)
+
λ
)
α
×
ⅇ
jθ
21
⁡
(
i
)
ⅇ
j
⁡
(
θ
21
⁡
(
i
)
+
λ
+
π
)
)
where λ represents an arbitrary angle, α represents a positive real number other than 1, θ11(i) and θ21(i) satisfy:
ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
where x and y are any integers no less than 0 and no more than N−1 satisfying x≠y, and
a matrix selected for the first slot in the first coded block is the same as a matrix selected for the first slot in the second coded block.

69 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/985,707Filed 17 Feb 2012
Priority: JP 2011-03508621 Feb 2011
Published: US 2013/0322566 A15 Dec 2013
Granted: 3 Mar 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04B 7/0456
MIMO systems: selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
H04B 7/0413
Using two or more spaced independent antennas: mIMO systems
H04B 7/0617
Of weighted versions of same signal: for beam forming
H04L 1/005
Decoding adapted to other signal detection operation: iterative decoding, including iteration between signal detection and decoding operation

Family

US 2013/0322566 A1Pre-grant publication · published 5 Dec 2013
US 8,971,439 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

selecting one matrix from among N matrices F[i] by hopping between the matrices, for each of a plurality of slots, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, the N matrices F[i] each defining a precoding process that is performed on a plurality of baseband signals;
generating a first coded block and a second coded block from transmission data by using a predetermined error correction block coding scheme;
performing a precoding process that corresponds to the selected matrix on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in the first coded block, thereby generating a first precoded signal z1 and a second precoded signal z2;
and
performing a precoding process that corresponds to the selected matrix on a first baseband signal s1 and a second baseband signal s2 generated from a plurality of bits included in the second coded block, thereby generating a first precoded signal z1 and a second precoded signal z2, wherein
the first precoded signals z1 and the second precoded signals z2 satisfy (z1, z2)T=F[i] (s1, s2)T,
the N matrices F[i] satisfy:
F
⁡
[
i
]
=
1
α
2
+
1
⁢
(
ⅇ
jθ
11
⁡
(
i
)
α
×
ⅇ
j
⁡
(
θ
11
⁡
(
i
)
+
λ
)
α
×
ⅇ
jθ
21
⁡
(
i
)
ⅇ
j
⁡
(
θ
21
⁡
(
i
)
+
λ
+
π
)
)
where λ represents an arbitrary angle, α represents a positive real number other than 1, θ11(i) and θ21(i) satisfy:
ej(θ11(x)−θ21(x))≠ej(θ11(y)−θ21(y))
where x and y are any integers no less than 0 and no more than N−1 satisfying x≠y, and
a matrix selected for the first slot in the first coded block is the same as a matrix selected for the first slot in the second coded block.

68 more elements

Facts

Application

13/985,707Filed 17 Feb 2012

Priority

JP 2011-03508621 Feb 2011

Published

US 2013/0322566 A15 Dec 2013

Granted

3 Mar 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04B 7/0456
MIMO systems: selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
H04B 7/0413
Using two or more spaced independent antennas: mIMO systems
H04B 7/0617
Of weighted versions of same signal: for beam forming
H04L 1/005
Decoding adapted to other signal detection operation: iterative decoding, including iteration between signal detection and decoding operation