Method and apparatus for combining space-frequency block coding, spatial multiplexing and beamforming in a mimo-ofdm system

Patent metadata

Field	Value
Publication number	US-2017195084-A1
Application number	US-201715401924-A
Country	US
Kind code	A1
Filing date	Jan 9, 2017
Priority date	Nov 12, 2004
Publication date	Jul 6, 2017
Grant date	—

Abstract

A method and apparatus for combining space-frequency block coding (SFBC) in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system is described herein. A transmitter, according to one embodiment, may include four antennas and circuitry configured to transmit in an OFDM symbol time period using both frequency diversity and SFBC. For frequency diversity at least one first data element may be repeated producing at least two second data elements and the two second data elements are transmitted using different subcarriers. For space frequency block coding, a pair of third data elements may be space frequency block coded producing four fourth data elements. The four fourth data elements may be transmitted using two subcarriers and only two of the four antennas.

First claim

1 .- 12 . (canceled)

13 . A device for transmitting data symbols comprising:
four antennas; a receiver configured to receive channel state information (CSI), wherein the CSI includes a channel quality indicator (CQI) for each of a plurality of groups of subcarriers; a transmitter configured to determine a number of streams for transmission using spatial multiplexing and determine a modulation and coding scheme for each of the plurality of groups of subcarriers based on each CQI; the transmitter further configured to transmit first data symbols using the plurality of groups of subcarriers and the determined number of streams; and the transmitter further configured to transmit second data symbols using space frequency block coding (SFBC), wherein each pair of the second data symbols are SFBC coded to be transmitted on only two of four antennas.

14 . The transmitting device of claim 13 wherein the transmitter is further configured to transmit data symbols using multiple input multiple output (MIMO).

15 . A device for receiving data symbols comprising:
a transmitter configured to transmit channel state information (CSI), wherein the CSI includes a channel quality indicator (CQI) for each of a plurality of groups of subcarriers; the receiver further configured to receive first data symbols over a number of streams that were transmitted using spatial multiplexing and a modulation and coding scheme for each of the plurality of groups of subcarriers determined based on each CQI; and the receiver further configured to receive second data symbols, wherein the second data symbols were transmitted using space frequency block coding (SFBC) and each pair of the second data symbols were SFBC coded to be transmitted on only two of four antennas.

16 . The receiving device of claim 15 wherein the receiver is further configured to receive data symbols using multiple input multiple output (MIMO).

17 . A method for transmitting data symbols, the method comprising:
receiving channel state information (CSI), wherein the CSI includes a channel quality indicator (CQI) for each of a plurality of groups of subcarriers; determining a number of streams for transmission using spatial multiplexing and a modulation and coding scheme for each of the plurality of groups of subcarriers based on each CQI; transmitting first data symbols using the plurality of groups of subcarriers and the determined number of streams; and transmitting second data symbols using space frequency block coding (SFBC), wherein each pair of the second data symbols are SFBC coded to be transmitted on only two of four antennas.

18 . The method of claim 17 wherein data symbols are received using multiple input multiple output (MIMO).

Assignees

• Interdigital Tech Corp

Inventors

• Kwak Jaeyoung
• Koo Chang-Soo
• Olesen Robert L
• Bultan Aykut
• Ozluturk Fatih

Classifications

• H04L25/0248

  Eigen-space methods · CPC title

• H04L1/0009

  by adapting the channel coding (H04L1/1812 takes precedence) · CPC title

• H04L1/0606 Primary

  Space-frequency coding · CPC title

• H04L27/2647

  Arrangements specific to the receiver only (equalisation H04L27/01) · CPC title

• H04B7/0697 Primary

  using spatial multiplexing · CPC title