Antenna selection and pilot compression in MIMO systems

摘要

A system that facilitates antenna selection and pilot reduction in a multi-antenna system is provided. During operation, in response to an activating event, the system performs a full pilot transmission by transmitting pilot signals through all available transmit antennas at a base station. The system then determines the selected subset of transmit antennas by receiving lists of selected antennas from mobile stations associated with preferred users, wherein a given mobile station selects a list of antennas in response to pilot signals received during the full pilot transmission. The system then combines the received lists to produce the selected subset, wherein the selected subset includes all antennas which appear in the received lists of selected antennas. Next, during normal system operation, the system periodically performs a selected pilot transmission by transmitting pilot signals through a selected subset of the available transmit antennas.

主权项

1. A method for pilot compression at a base station in a multi-antenna system, comprising:
in response to an activating event, transmitting a plurality of pilot signals through a plurality of transmit antennas at the base station, wherein each of the plurality of transmit antennas transmits a corresponding one of the plurality of pilot signals; receiving a set of feedback signals from each of a set of mobile stations, wherein for a given mobile station, each of the feedback signals indicates qualities of each channel over which the plurality of pilot signals are received by the given mobile station from the plurality of transmit antennas; selecting for each mobile station a subset of transmit antennas based on the qualities of the each channel indicated in the set of feedback signals; identifying a superset of transmit antennas, the superset of transmit antennas including all transmit antennas of the subsets of transmit antennas; and during normal system operation, periodically performing a selected pilot transmission including transmitting pilot signals through the superset of transmit antennas.