MIMO WLAN SYSTEM
First Claim
1. A method of performing channel estimation in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
- receiving a steered pilot via at least one eigenmode of an uplink from a user terminal; and
estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot.
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Accused Products
Abstract
A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.
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Citations
14 Claims
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1. A method of performing channel estimation in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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receiving a steered pilot via at least one eigenmode of an uplink from a user terminal; and estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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a receive spatial processor operative to receive a steered pilot via at least one eigenmode of an uplink from a user terminal; and a controller operative to estimate a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot. - View Dependent Claims (8, 9, 10)
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11. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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means for receiving a steered pilot via at least one eigenmode of an uplink from a user terminal; and means for estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot. - View Dependent Claims (12, 13, 14)
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Specification