US 7,680,203 B2Granted

Wireless communication apparatus and wireless communication method

AssigneeSony Corporation

InventorShinichi Kuroda

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Abstract

A wireless communication apparatus for receiving spatially multiplexed signals in which a plurality of streams are spatially multiplexed, using a plurality of antennas, includes the following elements: a channel matrix estimator for estimating a channel matrix for multiplexed channels; a spatial decoder for spatially decoding received signals each of which has been received by a corresponding antenna so as to separate the received signals into individual stream signals by obtaining an antenna weight matrix from the estimated channel matrix, and then multiplying each received signal by the antenna weight matrix; a likelihood information estimator for estimating likelihood information using the estimated channel matrix, the antenna weight matrix, and estimated noise power; and a soft decision decoder for performing soft decision decoding on each stream signal on the basis of the estimated likelihood information.

Claims6

Dependent claims

A wireless communication apparatus for receiving spatially multiplexed signals via respective antennas, comprising:

a channel matrix estimator for estimating a channel matrix for spatially multiplexed channels;
a spatial decoder for decoding the received spatially multiplexed signals into respective individual stream signals by obtaining an antenna weight matrix from the estimated channel matrix, and multiplying the received spatially multiplexed signals by the antenna weight matrix;
a likelihood information estimator for estimating, for each decoded stream signal, likelihood information according to the following equations:
N
^
l
=


w
.
l


2
⁢
σ
r
2
,
S
^
l
=

w
.
l
·
h
.
l

2
-
N
^
l
,
⁢
and
I
^
l
=
∑
i
=
l
⁡
(
i
≠
1
)
L
⁢
⁢

w
.
l
·
h
.
l

2
⁢
σ
r
2
,
where {circumflex over (N)}l is the noise power of the decoded stream signal, Ŝl is the signal power of the decoded stream signal, Îl is the interference power of the decoded stream signal, {dot over (h)}l is a channel vector for the decoded stream signal from the estimated channel matrix, {dot over (w)}l is an antenna weight vector for the decoded stream signal from the antenna weight matrix, and σr2 is an estimated noise power of a respective spatially multiplexed signal;
and
a soft decision decoder for performing soft decision decoding on each stream signal based on the respective estimated likelihood information.

73 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/385,755Filed 22 Mar 2006
Priority: JP P2005-09635229 Mar 2005
Published: US 2006/0269006 A130 Nov 2006
Granted: 16 Mar 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04L 25/0202
Details ; arrangements for supplying electrical power along data transmission lines: channel estimation
H04L 25/0224
Channel estimation: using sounding signals
H04L 25/03318
Arrangements specific to the provision of output signals: provision of soft decisions
H04L 27/2601
Systems using multi-frequency codes: multicarrier modulation systems