MIMO WLAN system

摘要

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.

主权项

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, the steered pilot being transmitted via a plurality of antennas at the user terminal; estimating a channel response of the at least one eigenmode of the uplink for the user terminal based on the received steered pilot; deriving a matched filter based on the estimated channel response of the at least one eigenmode of the uplink; receiving a data transmission via the at least one eigenmode of the uplink from the user terminal; and using the matched filter for matched filtering of the data transmission.