Pilots for MIMO communication systems

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.

A device for wireless multiple-input multiple-output (MIMO) communication utilizing orthogonal frequency division multiplexing (OFDM) comprising:

• 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.

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:

• 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.