Reduction Of Interference In A Wireless Network Through Spectrum Analysis And Transmit Beamforming

摘要

A method and system are described for optimizing signal strength of a beam-formed wireless network transmission at intended receiver(s) while reducing unintended interference with unintended receiver(s), without requiring high speed exchange of information between nodes. The method is operable by a multi-antenna node of a wireless network in which nodes use the same spectrum for both transmitting and receiving, so that the channel information between the nodes is reciprocal. This allows transmit channel information to be directly determined from signals received from unintended receivers. Scheduling information about the unintended receivers can also be estimated based on the received signals, for example by assuming that the unintended receivers will transmit as frequently as they receive, and/or by obtaining scheduling information from handshake signals or packet headers of the received signals. The precoding matrix can minimize the transmission at one or more unintended receiver and/or maximize a sum capacity of the transmission.