OPTIMUM TRAINING SEQUENCES FOR WIRELESS SYSTEMS
First Claim
Patent Images
1. A method for communicating, comprising:
- transmitting a set of first training symbols using a first communication channel; and
transmitting one or more sets of second training symbols using one or more second communication channels;
wherein the one or more sets of second training symbols are based on the set of first training symbols and a cross-correlation estimate between the first set of training symbols and at least one of the one or more sets of second training symbols is essentially zero, where a channel estimation is performed without performing a matrix inversion.
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Abstract
In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using various sets of training symbols that produce zero cross-correlation energy. Channel communication can accordingly be simplified as the zero cross-correlation property allows for channel estimation without a matrix inversion.
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Citations
23 Claims
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1. A method for communicating, comprising:
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transmitting a set of first training symbols using a first communication channel; and
transmitting one or more sets of second training symbols using one or more second communication channels;
wherein the one or more sets of second training symbols are based on the set of first training symbols and a cross-correlation estimate between the first set of training symbols and at least one of the one or more sets of second training symbols is essentially zero, where a channel estimation is performed without performing a matrix inversion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of communicating, comprising:
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receiving a set of first training symbols;
receiving one or more sets of second training symbols; and
characterizing two or more communication channels based on the set of first training symbols and the one or more sets of second training symbols;
wherein a cross-correlation estimate between the set of first training symbols and at least one of the sets of second training symbols is essentially zero, where a channel estimation is performed without performing a matrix inversion. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for communicating, comprising:
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a first transmit device that transmits a set of first training symbols; and
a second transmit device that transmits a set of second training symbols;
wherein a cross-correlation estimate between the set of first training symbols and the set of second training symbols is essentially zero, where a channel estimation is performed without performing a matrix inversion. - View Dependent Claims (19)
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20. An apparatus for communicating, comprising:
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a receive device that receives at least a set of first training symbols transmitted by a first transmit device and a set of second training symbols transmitted by a second transmit device; and
an estimator that estimates at least a first channel related to the first transmit device based on at least the set of first training symbols;
wherein a cross-correlation estimate between the set of first training symbols and the set of second training symbols is essentially zero, where a channel estimation is performed without performing a matrix inversion. - View Dependent Claims (21, 22, 23)
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Specification