Pilots for MIMO communication systems
First Claim
1. A method for wireless multiple-input multiple-output (MIMO) communication utilizing orthogonal frequency division multiplexing (OFDM) comprising:
- obtaining a set of pilot symbols for each antenna in a plurality of antennas;
obtaining an orthogonal sequence for each antenna in the plurality of antennas, wherein the plurality of antennas are assigned different orthogonal sequences;
covering the set of pilot symbols for each antenna with the orthogonal sequence for the antenna to obtain a set of sequences of covered pilot symbols for the antenna;
processing the set of sequences of covered pilot symbols for each antenna to obtain a sequence of OFDM symbols for the antenna; and
transmitting the plurality of sequences of OFDM symbols from the plurality of antennas.
2 Assignments
0 Petitions
Accused Products
Abstract
Pilots suitable for use in MIMO systems and capable of supporting various functions are described. The various types of pilot include—a beacon pilot, a MIMO pilot, a steered reference or steered pilot, and a carrier pilot. The beacon pilot is transmitted from all transmit antennas and may be used for timing and frequency acquisition. The MIMO pilot is transmitted from all transmit antennas but is covered with different orthogonal codes assigned to the transmit antennas. The MIMO pilot may be used for channel estimation. The steered reference is transmitted on specific eigenmodes of a MIMO channel and is user terminal specific. The steered reference may be used for channel estimation. The carrier pilot may be transmitted on designated subbands/antennas and may be used for phase tracking of a carrier signal. Various pilot transmission schemes may be devised based on different combinations of these various types of pilot.
495 Citations
48 Claims
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1. A method for wireless multiple-input multiple-output (MIMO) communication utilizing orthogonal frequency division multiplexing (OFDM) comprising:
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obtaining a set of pilot symbols for each antenna in a plurality of antennas; obtaining an orthogonal sequence for each antenna in the plurality of antennas, wherein the plurality of antennas are assigned different orthogonal sequences; covering the set of pilot symbols for each antenna with the orthogonal sequence for the antenna to obtain a set of sequences of covered pilot symbols for the antenna; processing the set of sequences of covered pilot symbols for each antenna to obtain a sequence of OFDM symbols for the antenna; and transmitting the plurality of sequences of OFDM symbols from the plurality of antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A device for wireless multiple-input multiple-output (MIMO) communication utilizing orthogonal frequency division multiplexing (OFDM) comprising:
- a plurality of antennas;
a processing circuit configured to obtain a set of pilot symbols for each antenna in the plurality of antennas, obtain an orthogonal sequence for each antenna in the plurality of antennas, wherein the plurality of antennas are assigned different orthogonal sequences, cover the set of pilot symbols for each antenna with the orthogonal sequence for the antenna to obtain a set of sequences of covered pilot symbols for the antenna, and process the set of sequences of covered pilot symbols for each antenna to obtain a sequence of OFDM symbols for the antenna; and a transmitter configured to transmit the plurality of sequences of OFDM symbols from the plurality of antennas. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
- a plurality of antennas;
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47. A device for wireless multiple-input multiple-output (MIMO) communication utilizing orthogonal frequency division multiplexing (OFDM) comprising:
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means for obtaining a set of pilot symbols for each antenna in a plurality of antennas; means for obtaining an orthogonal sequence for each antenna in the plurality of antennas, wherein the plurality of antennas are assigned different orthogonal sequences; means for covering the set of pilot symbols for each antenna with the orthogonal sequence for the antenna to obtain a set of sequences of covered pilot symbols for the antenna; means for processing the set of sequences of covered pilot symbols for each antenna to obtain a sequence of OFDM symbols for the antenna; and means for transmitting the plurality of sequences of OFDM symbols from the plurality of antennas.
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48. A non-transitory machine-readable storage medium for use with a wireless multiple-input multiple-output (MIMO) communication system utilizing orthogonal frequency division multiplexing (OFDM), the machine-readable storage medium having one or more instructions which when executed by at least one processing circuit causes the at least one processing circuit to:
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obtain a set of pilot symbols for each antenna in a plurality of antennas; obtain an orthogonal sequence for each antenna in the plurality of antennas, wherein the plurality of antennas are assigned different orthogonal sequences; cover the set of pilot symbols for each antenna with the orthogonal sequence for the antenna to obtain a set of sequences of covered pilot symbols for the antenna; process the set of sequences of covered pilot symbols for each antenna to obtain a sequence of OFDM symbols for the antenna; and transmit the plurality of sequences of OFDM symbols from the plurality of antennas.
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Specification