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.

主权项

1. A method of operating a first wireless network node having N transmitting antennae, the method comprising:
receiving a signal from an interfering node to which the first wireless network node is not connected, wherein the first wireless network node is a base station and the interfering node is a mobile device not served by the base station; determining, from the received signal, interference information that pertains to the interfering node; determining a transmission to be sent to a second wireless network node, said transmission including M transmission channels, wherein the second wireless network node is a mobile device served by the base station; calculating a precoding matrix based at least in part on the interference information, said precoding matrix having dimensions M and N, said precoding matrix being calculated according to a precoding strategy; applying the precoding matrix to the transmission, thereby determining a phase, amplitude, and apportioning of the transmission channels to the transmitting antennae that impose a spatial transmission pattern on the transmission, said spatial pattern being configured to reduce interference of the transmission at the interfering node; and sending the transmission to the second wireless network node.