Adaptive pilot insertion for a MIMO-OFDM system
First Claim
1. A method of transmitting pilot in a multiple-input multiple-output (MIMO) communication system, comprising:
- transmitting in each protocol data unit (PDU) a first pilot suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity; and
selectively transmitting in each PDU an additional pilot suitable for deriving an improved estimate of the MIMO channel response.
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Accused Products
Abstract
A transmitting entity transmits a “base” pilot in each protocol data unit (PDU). A receiving entity is able to derive a sufficiently accurate channel response estimate of a MIMO channel with the base pilot under nominal (or most) channel conditions. The transmitting entity selectively transmits an additional pilot if and as needed, e.g., based on channel conditions and/or other factors. The additional pilot may be adaptively inserted in almost any symbol period in the PDU. The receiving entity is able to derive an improved channel response estimate with the additional pilot. The transmitting entity sends signaling to indicate that additional pilot is being sent. This signaling may be embedded within pilot symbols sent on a set of pilot subbands used for a carrier pilot that is transmitted across most of the PDU. The signaling indicates whether additional pilot is being sent and possibly other pertinent information.
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Citations
51 Claims
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1. A method of transmitting pilot in a multiple-input multiple-output (MIMO) communication system, comprising:
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transmitting in each protocol data unit (PDU) a first pilot suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity; and
selectively transmitting in each PDU an additional pilot suitable for deriving an improved estimate of the MIMO channel response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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a transmitter unit to transmit in each protocol data unit (PDU) a first pilot suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity and to selectively transmit in each PDU an additional pilot suitable for deriving an improved estimate of the MIMO channel response; and
a controller to direct selective transmission of the additional pilot in each PDU. - View Dependent Claims (14, 15, 16)
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17. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for transmitting in each protocol data unit (PDU) a first pilot suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity; and
means for selectively transmitting in each PDU an additional pilot suitable for deriving an improved estimate of the MIMO channel response. - View Dependent Claims (18, 19, 20)
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21. A method of transmitting signaling in a multiple-input multiple-output (MIMO) communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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selecting a signaling value from among a plurality of signaling values;
selecting a set of pilot symbols from among a plurality of sets of pilot symbols, wherein each of the plurality of sets of pilot symbols corresponds to a different one of the plurality of signaling values, and wherein the selected set of pilot symbols corresponds to the selected signaling value; and
multiplexing the selected set of pilot symbols on a first set of frequency subbands used for a carrier pilot. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. An apparatus in a multiple-input multiple-output (MIMO) communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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a controller to select a signaling value from among a plurality of signaling values;
a processor to select a set of pilot symbols from among a plurality of sets of pilot symbols, wherein each of the plurality of sets of pilot symbols corresponds to a different one of the plurality of signaling values, and wherein the selected set of pilot symbols corresponds to the selected signaling value; and
a multiplexer to multiplex the selected set of pilot symbols on a first set of frequency subbands used for a carrier pilot. - View Dependent Claims (30, 31, 32)
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33. An apparatus in a multiple-input multiple-output (MIMO) communication system utilizing orthogonal frequency division multiplexing (OFDM), comprising:
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means for selecting a signaling value from among a plurality of signaling values;
means for selecting a set of pilot symbols from among a plurality of sets of pilot symbols, wherein each of the plurality of sets of pilot symbols corresponds to a different one of the plurality of signaling values, and wherein the selected set of pilot symbols corresponds to the selected signaling value; and
means for multiplexing the selected set of pilot symbols on a first set of frequency subbands used for a carrier pilot - View Dependent Claims (34, 35, 36)
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37. A method of receiving pilot in a multiple-input multiple-output (MIMO) communication system, comprising:
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receiving a first pilot transmitted in each protocol data unit (PDU) and suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity; and
receiving an additional pilot selectively transmitted in each PDU and suitable for deriving an improved estimate of the MIMO channel response. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
a receiver unit to receive a first pilot transmitted in each protocol data unit (PDU) and suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity and to receive an additional pilot selectively transmitted in each PDU and suitable for deriving an improved estimate of the MIMO channel response. - View Dependent Claims (45, 46, 47)
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48. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for receiving a first pilot transmitted in each protocol data unit (PDU) and suitable for deriving an estimate of a response of a MIMO channel between a transmitting entity and a receiving entity; and
means for receiving an additional pilot selectively transmitted in each PDU and suitable for deriving an improved estimate of the MIMO channel response. - View Dependent Claims (49, 50, 51)
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Specification