US 9,755,709 B2Granted

Method and apparatus for measuring channel quality in multiple input multiple output system

AssigneeSamsung Electronics Co., Ltd.

InventorsDong-Sik Kim, Soo-Bok Yeo

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Abstract

A method and an apparatus for measuring channel quality in a MIMO system is provided. The method includes measuring a first SINR based on an assumption that a first detector is used, using a channel estimation value of a reception signal with respect to each of a plurality of space layers, and a second SINR for each of the plurality of space layers corresponding to a case where the plurality of space layers exist independently using the channel estimation value of the reception signal; determining a Log Likelihood Ratio of reception data based on an assumption that a second detector is used, with respect to each of the plurality of space layers; and generating channel quality information based on an assumption that the second detector is used, based on the first SINR and the second SINR with respect to each of the plurality of space layers, and the LLR.

Claims12

Dependent claims

A method for operating an apparatus for measuring channel quality in a multi input multi output (MIMO) system, the method comprising:

determining a first mean mutual information per bit (MMIB) for a codeword based on an assumption that a first signal is received at a spatial layer by using a first detector;
determining a second MMIB for the codeword based on an assumption that a second signal having no interference with other signals is received at the spatial layer;
determining a third MMIB based on data received at the spatial layer by using a second detector used in a codeword unit;
determining a parameter which is associated with the second detector, based on the first MMIB, the second MMIB, and the third MMIB;
and
generating channel quality information for the spatial layer based on the first MMIB, the second MMIB and the determined parameter,
wherein determining the first MMIB comprises:
determining a first plurality of signal-to-interference plus noise ratios (SINRs) for a plurality of resource elements allocated to the first signal, each of the first plurality of SINRs corresponding to each of the plurality of resource elements;
determining a first plurality of MMIBs based on the first plurality of SINRs, each of the first plurality of MMIBs corresponding to each of the first plurality of the SINRs;
and
determining the first MMIB for the codeword by averaging the first plurality of the MMIBs,
wherein determining the second MMIB comprises:
determining a second plurality of SINRs for the plurality of resource elements allocated to the second signal, each of the second plurality of SINRs corresponding to each of the plurality of the resource elements;
determining a second plurality of MMIBs based on the second plurality of SINRs, each of the second plurality of MMIBs corresponding to each of the second plurality of the SINRs;
and
determining the second MMIB for the codeword by averaging the second plurality of the MMIBs, and
wherein determining the third MMIB comprises:
determining a log likelihood ratio (LLR) for the data received at the spatial layer by using the second detector;
and
determining the third MMIB corresponding to the determined LLR for the received data by using a table indicating a mapping relationship between an MMIB and an absolute value of an LLR,
wherein the plurality of resource elements corresponds to the codeword.

18 more elements

An apparatus for measuring channel quality in a multi input multi output (MIMO) system, comprising:

a mean mutual information per bit (MMIB) determination unit configured to:
determine a first MMIB for a codeword based on an assumption that a first signal is received at a spatial layer by using a first detector;
determine a second MMIB for the codeword based on an assumption that a second signal having no interference with other signals is received at a spatial layer;
determine a third MMIB based on data received at the spatial layer by using a second detector used in a codeword unit;
determine a parameter associated with the second detector based on the first MMIB, the second MMIB, and the third MMIB, and
a channel quality information determination unit configured to generate channel quality information for the spatial layer based on the first MMIB, the second MMIB, and the determined parameter, and
wherein the MMIB determination unit is configured to:
determine a first plurality of signal-to-interference plus noise ratios (SINRs) for a plurality of resource elements allocated to the first signal, each of the first plurality of SINRs corresponding to each of the plurality of resource elements;
determine a first plurality of MMIBs based on the first plurality of SINRs, each of the first plurality of MIMBs corresponding to each of the first plurality of SINRs;
and
determine the first MMIB for the codeword by averaging the first plurality of MMIBs, wherein the MMIB determination unit is configured to:
determine a second plurality of SINRs for the plurality of resource elements allocated to the second signal, each of the second plurality of SINRs corresponding to each of the plurality of resource elements;
determine a second plurality of MMIBs based on the second plurality of SINRs, each of the second plurality of MMIBs corresponding to each of the second plurality of SINRs;
and
determine the second MMIB for the codeword by averaging the second plurality of MMIBs,
wherein the MMIB determination unit is configured to:
determine a log likelihood ratio (LLR) for the received data by using the second detector;
and
determine the third MMIB corresponding to the determined LLR for the data received at the spatial layer by using a table indicating a mapping relationship between an MMIB and an absolute value of an LLR, and
wherein the plurality of resource elements corresponds to the codeword.

17 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/733,414Filed 8 Jun 2015
Priority: KR 10-2014-01161732 Sep 2014
Published: US 2016/0065274 A13 Mar 2016
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04B 7/0413
Using two or more spaced independent antennas: mIMO systems
H04B 17/336
Measuring or estimating channel quality parameters: signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
H04L 1/20
Arrangements for detecting or preventing errors in the information received: using signal quality detector
H04L 25/0202
Details ; arrangements for supplying electrical power along data transmission lines: channel estimation