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US 7,606,316 B1Granted
MIMO-OFDM preamble for channel estimation
AssigneeMarvell International Ltd.
InventorRavi Narasimhan
Life of this patent
Estimating the term…
Abstract
A preamble for a MIMO-OFDM system includes multiple training symbols. Each training symbol has a pattern in which data symbols and null symbols are transmitted on all tones and on all transmit antennas. The pattern for each training symbol corresponds to a cyclic shift of the patterns of the other training symbols.
Claims82
A method comprising:
- generating a first training symbol,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones;
- and
- operating a transmitter to transmit the first training symbol on a plurality of antennas, wherein each of the plurality of antennas transmits a corresponding one of the plurality of data symbols.
2 more elements
A method comprising:
- receiving, in a receiver, a first training symbol transmitted by a plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of data symbols is received from a corresponding one of the plurality of antennas;
- and
- in response to at least the first training symbol, determining a gain at each of the plurality of antennas for each of the plurality of tones.
3 more elements
A memory that stores data comprising:
- a preamble structure comprising a first training symbol comprising a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of data symbols is designated to be transmitted by a corresponding one of a plurality of antennas.
An apparatus comprising:
- a training module operative to transmit a first training symbol on a plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of antennas transmits a corresponding one of the plurality of data symbols.
1 more element
An apparatus comprising:
- a training module operative to receive a first training symbol transmitted by a plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of data symbols is received from a corresponding one of the plurality of antennas;
- and
- in response to at least the first training symbol, determine a gain at each of the plurality of antennas for each of the plurality of tones.
3 more elements
An apparatus comprising:
- means for transmitting a first training symbol on a plurality of antennas;
- and
- means for generating the first training symbol, wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of antennas transmits a corresponding one of the plurality of data symbols.
2 more elements
A apparatus comprising:
- means for receiving a first training symbol transmitted by a plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of data symbols is received from a corresponding one of the plurality of antennas;
- and
- means for determining a gain at each of the plurality of antennas for each of the plurality of tones in response to at least the first training symbol.
3 more elements
A computer readable memory containing a program that causes one or more wireless communication devices to perform operations comprising:
- transmitting a first training symbol on a plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the plurality of antennas transmits a corresponding one of the plurality of data symbols.
1 more element
A computer readable memory containing a program that causes one or more wireless communication devices to perform operations comprising:
- receiving a first training symbol transmitted by a plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of a plurality of subsets of the plurality of data symbols is received from a corresponding one of the plurality of antennas;
- and
- in response to at least the first training symbol, determining a gain at each of the plurality of antennas for each of the plurality of tones.
3 more elements
A system comprising:
- a first transceiver comprising
- a first plurality of antennas, and
- a transmit training module operative to transmit a first training symbol on the first plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the first plurality of antennas transmits a corresponding one of the plurality of data symbols;
- and
- a second transceiver comprising
- a second plurality of antennas, and
- a receive training module operative to receive the first training symbol and to determine a gain at each of the first plurality of antennas for each of the plurality of tones in response to at least the first training symbol.
7 more elements
A system comprising:
- a first transceiver comprising
- a first plurality of antennas, and
- means for transmitting a first training symbol on the first plurality of antennas,
- wherein the first training symbol comprises a plurality of data symbols,
- wherein each of the plurality of data symbols corresponds to different ones of a plurality of tones, and
- wherein each of the first plurality of antennas transmits a corresponding one of the plurality of data symbols;
- and
- a second transceiver comprising
- a second plurality of antennas,
- means for receiving the first training symbol, and
- means for determining a gain at each of the first plurality of antennas for each of the plurality of tones in response to at least the first training symbol.
8 more elements
Dependencies are inferred from the claim text.