US 8,412,114 B2Granted

Adaptive method of transmitting and receiving a signal in a multi-antenna system, corresponding transmission and reception devices, computer program products and signal

AssigneeFrance Telecom

InventorsRaphael Visoz, Patricia Layec, Antoine Berthet

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Abstract

A method is provided for receiving a signal, corresponding to a data signal transmitted by a transmitter to a receiver via a transmission channel. The method includes the following steps: analyzing the signal received, delivering an information item representative of the transmission channel; determining, periodically and/or as a function of a variation of the transmission channel: at least one distribution of the transmission antennas into at least one group of at least one antenna as a function of the information item representative of the transmission channel, wherein at least one group includes at least two transmission antennas for at least one of the determinations; and specific efficiencies assigned respectively to each of the groups of antennas for each distribution as a function of the information item, and transmitting to the transmitter a parameterization signal defining the at least one distribution and the specific efficiencies.

Claims11

Dependent claims

A method for receiving a signal, named a received signal, corresponding to a data signal sent out by a transmitter to a receiver through a transmission channel, said transmitter comprising NT transmit antennas and said receiver comprising NR receive antennas, with NT and NR being greater than or equal to 2, wherein the method comprises the following steps:

analyzing said received signal, delivering a piece of information representing said transmission channel;
determining periodically and/or as a function of a variation of said transmission channel:
at least one distribution of said transmit antennas into at least one group as a function of said piece of information representing the transmission channel, each group comprising at least one of the transmit antennas, wherein at least one of said at least one group comprises at least two of the transmit antennas as a result of at least one of said determining steps;
specific rates allocated respectively to each of said groups of transmit antennas for each distribution as a function of said piece of information representing the transmission channel;
and
transmitting to said transmitter a parameterizing signal defining said at least one distribution and said specific rates;
wherein, in the determining step, an optimized ordered distribution Γ*, the specific rates per group R* for this distribution, and an optimized set S* of the active antennas are determined from the following equations:
(
S
*
,
Γ
*
)
=
arg
⁢
⁢
max
S
,
⁢
Γ
⁢
T
S
,
Γ
R
*
=
⋃
K
i
=
1
⁢
{
r
Δ
i
*
⁡
(
S
*
,
Γ
*
)
}
with:
T
S
,
Γ
=
∑
i
=
1
K
⁢
r
Δ
i
*
⁡
(
S
,
Γ
)
;
r
Δ
i
*
⁡
(
S
,
Γ
)
=
arg
⁢
⁢
min
r
Δ
i
∈
J

Δ
i

⁢
(
c
Δ
i
-
r
Δ
i
)
such
⁢
⁢
that
⁢
⁢
r
Δ
i
*
⁡
(
S
,
Γ
)
≤
c
Δ
i
;
c
Δ
i
=
log
2
⁢
det
(
I

Δ
i

+
A
Δ
i
⁡
(
P
1
,
…
⁢
,
P
N
T
,
H
,
ρ
)
)
;
where:
H represents said transmission channel;
ρ corresponds to signal-to-noise-ratio;
{P1, . . . , PNT} corresponds to a set of transmission power values assigned to each transmit antenna;
J|Δ| corresponds to a set of discrete rates available at transmission;
Δ corresponds to a group included in the distribution Γ;
AΔ is a matrix representing said receiver.

169 more elements

A device for receiving a signal, named a received signal, corresponding to a data signal sent out by a transmitter to a receiver through a transmission channel, said transmitter comprising NT transmit antennas and said receiver comprising NR receive antennas, with NT and NR being greater than or equal to 2, wherein the device comprises:

means for analyzing said received signal, delivering a piece of information representing said transmission channel;
means for determining periodically and/or as a function of a variation of said transmission channel:
at least one distribution of said transmit antennas into at least one group as a function of said piece of information representing the transmission channel, each group comprising at least one of the transmit antennas, wherein at least one of said at least one group comprises at least two of the transmit antennas as a result of at least one determining operations;
specific rates allocated respectively to each of said groups of transmit antennas for each distribution as a function of said piece of information representing the transmission channel;
and
means for transmitting to said transmitter a parameterizing signal defining said at least one distribution and said specific rates;
wherein the means for determining determines an optimized ordered distribution Γ*, the specific rates per group R* for this distribution, and an optimized set S* of the active antennas from the following equations:
(
S
*
,
Γ
*
)
=
arg
⁢
⁢
max
S
,
Γ
⁢
T
S
,
Γ
R
*
=
⋃
K
i
=
1
⁢
{
r
Δ
i
*
⁡
(
S
*
,
Γ
*
)
}
with:
T
S
,
Γ
=
∑
i
=
1
K
⁢
r
Δ
i
*
⁡
(
S
,
Γ
)
;
r
Δ
i
*
=
(
S
,
Γ
)
=
arg
⁢
min
r
Δ
i
∈
J

Δ
i

⁢
(
c
Δ
i
-
r
Δ
i
)
⁢
such
⁢
⁢
that
⁢
⁢
r
Δ
i
*
⁡
(
S
,
Γ
)
≤
c
Δ
i
;
c
Δ
i
=
log
2
⁢
det
(
I

Δ
i

+
A
Δ
i
⁡
(
P
1
,
…
⁢
,
P
N
T
,
H
,
ρ
)
)
;
where:
H represents said transmission channel;
ρ corresponds to signal-to-noise-ratio;
{P1, . . . , PNT} corresponds to a set of transmission power values assigned to each transmit antenna;
J|Δ| corresponds to a set of discrete rates available at transmission;
Δ corresponds to a group included in the distribution Γ;
AΔ is a matrix representing said receiver.

168 more elements

A non-transitory computer-readable medium comprising a computer program product stored thereon and executable by a processor, wherein the computer program product comprises program code instructions for implementing a method of receiving a signal, named a received signal, corresponding to a data signal sent out by a transmitter to a receiver through a transmission channel, when executed by the processor, said transmitter comprising NT transmit antennas and said receiver comprising NR receive antennas, with NT and NR being greater than or equal to 2, wherein the method comprises the following steps:

analyzing said received signal, delivering a piece of information representing said transmission channel;
determining periodically and/or as a function of a variation of said transmission channel:
at least one distribution of said transmit antennas into at least one group as a function of said piece of information representing the transmission channel, each group comprising at least one of the transmit antennas, wherein at least one of said at least one group comprises at least two of the transmit antennas as a result of at least one of said determining steps;
specific rates allocated respectively to each of said groups of transmit antennas for each distribution as a function of said piece of information representing the transmission channel;
and
transmitting to said transmitter a parameterizing signal defining said at least one distribution and said specific rates;
wherein, in the determining step, the processor determines an optimized ordered distribution Γ*, the specific rates per group R* for this distribution, and an optimized set S* of the active antennas from the following equations:
(
S
*
,
Γ
*
)
=
arg
⁢
⁢
max
S
,
⁢
Γ
⁢
T
S
,
Γ
R
*
=
⋃
K
i
=
1
⁢
{
r
Δ
i
*
⁡
(
S
*
,
Γ
*
)
}
with:
T
S
,
Γ
=
∑
i
=
1
K
⁢
r
Δ
i
*
⁡
(
S
,
Γ
)
;
r
Δ
i
*
⁡
(
S
,
Γ
)
=
arg
⁢
⁢
min
r
Δ
i
∈
J

Δ
i

⁢
(
c
Δ
i
-
r
Δ
i
)
such
⁢
⁢
that
⁢
⁢
r
Δ
i
*
⁡
(
S
,
Γ
)
≤
c
Δ
i
;
c
Δ
i
=
log
2
⁢
det
(
I

Δ
i

+
A
Δ
i
⁡
(
P
1
,
…
⁢
,
P
N
T
,
H
,
ρ
)
)
;
where:
H represents said transmission channel;
ρ corresponds to signal-to-noise-ratio;
{P1, . . . , PNT} corresponds to a set of transmission power values assigned to each transmit antenna;
J|Δ| corresponds to a set of discrete rates available at transmission;
Δ corresponds to a group included in the distribution Γ;
AΔ is a matrix representing said receiver.

169 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/441,057Filed 13 Sep 2007
Priority: FR 06 0802113 Sep 2006
Published: US 2010/0003934 A17 Jan 2010
Granted: 2 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04B 7/0447
Using multiple eigenmodes: utilizing uniform distribution
H04B 7/061
Antenna selection according to transmission parameters: using feedback from receiving side
H04L 1/0025
Characterised by the signalling: transmission of mode-switching indication
H04L 1/0003
By adapting the transmission rate: by switching between different modulation schemes