Method and apparatus for combining space-frequency block coding spatial multiplexing and beamforming in a MIMO-OFDM system

• US 9,160,492 B2
• Filed: 02/09/2012
• Issued: 10/13/2015
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kwak, Jaeyoung, Koo, Chang-Soo, Olesen, Robert Lind, Bultan, Aykut, Ozluturk, Fatih
• Primary Examiner(s): Aghdam, Freshteh N
• Application Number:
  US13/369,768
• Publication Number:
  US 20120140845A1
• Time in Patent Office: 1,342 Days
• Field of Search: 375/260, 375/267, 375/295, 375/299, 375/316
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 25/0248 Eigen-space methods
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

A method and apparatus for combining space-frequency block coding (SFBC) and frequency shift transmit diversity (FSTD) in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system.

Claims

1. A transmitting device comprising:

a circuit configured to transmit first data symbols using a first group of orthogonal frequency division multiplex (OFDM) subcarriers using space frequency block coding (SFBC);

wherein each pair of the first data symbols are SFBC coded to be transmitted on two of four antennas and not over the other two of the four antennas; and

the circuit is further configured to receive channel state information (CSI) from a receiving device;

wherein the CSI includes for each of a plurality of groups of subcarriers, a channel quality information (CQI) for each of the plurality of groups of subcarriers;

wherein the circuit is further configured for each of the plurality of groups of subcarriers, to determine a number of streams for transmission using multiple input multiple output (MIMO) spatial multiplexing and a modulation and coding for each group of the plurality of groups of subcarriers in response to the CQI for each group of the plurality of groups of subcarriers;

wherein at least two of the plurality of groups have different number of streams and different modulation and coding schemes;

wherein the circuit is configured to transmit second data symbols using the plurality of groups having the determined respective number of streams using MIMO spatial multiplexing.

2. A method for use by a transmitting device, the method comprising:

transmitting, by the transmitting device, first data symbols using a first group of orthogonal frequency division multiplex (OFDM) subcarriers using space frequency block coding (SFBC);

wherein each pair of the first data symbols are SFBC coded to be transmitted on two of four antennas and not over the other two of the four antennas; and

receiving, by the transmitting device, channel state information (CSI) from a receiving device;

wherein the CSI includes for each of a plurality of groups of subcarriers, a channel quality information (CQI) for each of the plurality of groups of subcarriers;

wherein for each of the plurality of groups of subcarriers, to determine a number of streams for transmission using multiple input multiple output (MIMO) spatial multiplexing and a modulation and coding for each group of the plurality of groups of subcarriers in response to the CQI for that group;

wherein at least two of the plurality of groups have different number of streams and different modulation and coding schemes; and

transmitting, by the transmitting device, second data symbols using the plurality of groups having the determined respective number of streams using MIMO spatial multiplexing.

3. A receiving device comprising:

a circuit configured to receive at least one of first data symbols and second data symbols from a transmitting device and to recover data from the at least one first data symbols and second data symbols;

wherein the first data symbols were transmitted using a first group of orthogonal frequency division multiplex (OFDM) subcarriers using space frequency block coding (SFBC);

wherein each pair of the first data symbols are SFBC coded to be transmitted on two of four antennas and not over the other two of the four antennas;

the circuit is configured to transmit to the transmitting device channel state information (CSI);

wherein the CSI includes for each of a plurality of groups of subcarriers, a channel quality information (CQI) for each of the plurality of groups of subcarriers;

wherein the circuit is further configured for each of the plurality of groups of subcarriers, to determine a number of streams for transmission using multiple input multiple output (MIMO) spatial multiplexing and a modulation and coding for each of the plurality of groups of subcarriers;

wherein at least two of the plurality of groups have different number of streams and different modulation and coding schemes; and

wherein the second data symbols were transmitted using the plurality of groups having the determined respective number of streams using multiple input multiple output (MIMO) spatial multiplexing.