PILOTS FOR MIMO COMMUNICATION SYSTEMS
First Claim
1. A method of generating pilots in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
- obtaining a pilot symbol 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; and
covering the pilot symbol for each antenna with the orthogonal sequence for the antenna to obtain a sequence of covered pilot symbols for the antenna, wherein a plurality of sequences of covered pilot symbols for a plurality of orthogonal pilots are obtained for the plurality of antennas.
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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.
144 Citations
1 Claim
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1. A method of generating pilots in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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obtaining a pilot symbol 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; and covering the pilot symbol for each antenna with the orthogonal sequence for the antenna to obtain a sequence of covered pilot symbols for the antenna, wherein a plurality of sequences of covered pilot symbols for a plurality of orthogonal pilots are obtained for the plurality of antennas.
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Specification