JP2013504224A5

JP2013504224A5 -

Info

Publication number: JP2013504224A5
Application number: JP2012527168A
Authority: JP
Filing date: 2010-09-02
Publication date: 2013-10-17
Anticipated expiration: 2030-09-02

Claims

A method of using a plurality of codewords belonging to a complete codebook and a plurality of partial codewords, each of the partial codewords including a plurality of codewords belonging to the complete codebook Is
Determining the best codeword in the complete codebook;
making a selection based on threshold criteria between a) the current partial codeword group just recently selected and b) another partial codeword group containing the best codeword in the complete codebook And adaptively selecting a partial codeword group to be a current partial codeword group from the plurality of partial codeword groups;
In the adaptively selecting step, if the current partial codeword group is to be changed, transmitting an indication of the current partial codeword group;
And repeatedly transmitting an index of codewords belonging to the current partial codeword group among the plurality of partial codeword groups.

In the adaptively selecting step,
a) i) It is also determined whether or not the best codeword in the complete codebook belongs to the recently selected partial codeword group, and if so, the recently selected portion Selecting a codeword group as the current partial codeword group;
ii) If the best codeword does not belong to the recently selected partial codeword group in the complete codebook, the best code from the recently selected partial codeword codeword group Select a word
If the best codeword in the group of recently selected partial codewords and the best codeword in the complete codebook satisfy the threshold criteria, the recently selected current partial codeword A group of current partial codewords, if not, a partial codeword group that includes the best codeword in the complete codebook is selected as the current partial codeword group,
b) selecting the best codeword from the recently selected partial codeword group;
If the best codeword from the group of recently selected partial codewords and the best codeword from the complete codebook both satisfy the threshold criteria, the recently selected current partial code Selecting a current partial codeword group that is a word group, and if not, selecting a partial codeword group that includes the best codeword in the complete codebook as the current partial codeword group. At least one
The method of claim 1, comprising :

If the correlation value between the best codeword in the recently selected partial codeword group and the best codeword in the complete codebook is higher than a predetermined threshold, the recent codeword The method of claim 2 , wherein the best codeword in the current partial codeword group just selected and the best codeword in the complete codebook satisfy a threshold criterion.

The method of claim 3, wherein the correlation value is calculated by a normalized inner product.

Each of the partial codewords has a corresponding unique identifier;
The method according to any one of claims 1 to 4 , wherein in the step of transmitting an indication of the current partial codeword group, the unique identifier associated with the current partial codeword group is transmitted.

For each of the partial codewords there is an associated header codeword belonging to the complete codebook,
In the step of transmitting an indication of the current partial code word groups, to send the index of the associated header code words for the current partial codeword groups belonging to the complete codebook A method according to claim 1 .

Claim transmitted index further comprises the step of transmitting information for determining whether the index of the code word in the index as or the current sub code word groups of codewords in a complete codebook the 6 the method according to.

The index of each codeword belonging to the current partial codeword group is an N-bit index,
N-bit index not used for any codeword belonging to the current partial codeword group, the transmitted index is an index in the complete codebook or an index in the current partial codeword group 8. The method of claim 7, wherein the method is used to specify whether there is.

Transmitting information for determining whether the transmitted index is an index of a codeword in the upper subset of the complete codebook or an index of a codeword in the current partial codeword group The method according to claim 6 .

The index of each codeword belonging to the current partial codeword group is an N-bit index,
N-bit index not used for any codeword belonging to the current partial codeword group, the transmitted index is an index in the upper subset of the complete codebook, or the current partial codeword The method of claim 9, wherein the method is used to specify whether the index is in a group.

Receiving a space-time encoded signal from a MIMO transmitter;
Determining channel information for the MIMO channel;
When the best codeword is selected from among the complete codebook or partial codeword group, the best codeword from the complete codebook or partial codeword group is selected based on channel information for the MIMO channel. A method according to any one of the preceding claims, comprising the step of selecting a codeword.

The method of claim 11 , wherein a codebook codeword defines a weighting factor applied to a signal transmitted from the MIMO transmitter.

A receiver circuit associated with multiple antennas;
A transmission circuit associated with the plurality of antennas;
A memory for storing partial codewords;
A subset selection unit, wherein the subset selection unit causes the device to perform a method based on a threshold criterion,
A method of using a plurality of codewords belonging to a complete codebook and a plurality of partial codewords, each of the partial codewords including a plurality of codewords belonging to the complete codebook, Is
Determining the best codeword in the complete codebook;
making a selection based on threshold criteria between a) the current partial codeword group just recently selected and b) another partial codeword group containing the best codeword in the complete codebook And adaptively selecting a partial codeword group to be a current partial codeword group from the plurality of partial codeword groups;
In the adaptively selecting step, if the current partial codeword group is to be changed, transmitting an indication of the current partial codeword group;
Transmitting an index of codewords belonging to the current partial codeword group among the plurality of partial codeword groups;
A device that repeatedly executes.

14. The device according to claim 13, wherein the device is a mobile station.

Each of the partial codewords has a corresponding unique identifier;
The apparatus of claim 13, wherein the apparatus transmits an indication of the current partial codeword group by transmitting the unique identifier associated with the current partial codeword group.

For each of the partial codewords there is an associated header codeword belonging to the complete codebook,
The apparatus by transmitting the index of the associated header code words for the complete code the current partial codeword groups belonging to the book, and transmits an indication of the current partial code word groups, claim 13 the apparatus according to.

One or more computer-readable media storing instructions for causing a receiver to perform the method of any one of claims 1-12 .