Co-phasing of transmissions from multiple infrastructure nodes

摘要

Briefly, in accordance with one or more embodiments, mobile station or user equipment receives pilot signals from two or more infrastructure nodes in a distributed antenna system, and calculates phase or timing information, or combinations thereof, from the pilot signals. The mobile station feeds back the phase or timing information, or combinations thereof, to the infrastructure nodes, and then receives one or more subsequent transmissions from the infrastructure nodes with phase shift or timing adjustments, or combinations thereof, calculated by the infrastructure nodes and applied to the spatial streams transmitted by the infrastructure nodes.

主权项

1. A method to be executed by an infrastructure node, comprising:
receiving one or more sounding signals transmitted to the infrastructure node from a remote station transmitting the sounding signals; exchanging timing information of the one or more sounding signals between the infrastructure node and one or more other infrastructure nodes; comparing phases or times of arrival, or combinations thereof, of the sounding signals on the infrastructure node and the one or more other infrastructure nodes; calculating phase adjustments or timing adjustments, or combinations thereof, to apply to spatial streams for the infrastructure node; and applying intra-node phase or timing adjustments, or inter-node phase or timing adjustments, or combinations thereof, during one or more transmissions from the infrastructure node to the remote station, wherein said applying comprises:
calculating adjustments for a first group of subcarriers;extrapolating the calculated adjustments for a second group of subcarriers; andapplying a phase adjustment or a timing adjustment, or combinations thereof, to the first group of subcarriers based on the calculated adjustments and to the second group of subcarriers based on the extrapolated adjustments according to a function of frequency, wherein the function is a linear function, a non-linear function, a filter function, or combinations thereof.