MIXED RANK DOWNLINK MULTI-USER INTERFERENCE ALIGNMENT SCHEME

摘要

A method, system and device are provided for using an indexed list of linearly independent, predetermined vectors Vref={vref1, . . . , vrefM} and channel knowledge H, G from each transmitter to compute and feedback equivalent channel matrix information Hi,jeq to its affiliated transmitter based on the assigned/determined rank of the receiver. With this information, each transmitter selects Li receivers and constructs a transmitted signal by applying a selected precoding matrix to the mixed rank data, thereby eliminating interference to the rest of the receivers in the network.

主权项

1. A method for aligning interference at a rank d receiver having K receive antennas caused by first and second transmitters each having M transmit antennas, comprising:
assembling at the receiver a first channel matrix for a first transmitter and a second channel matrix for a second transmitter; computing an equivalent direct channel matrix from the first and second channel matrices and d predetermined vectors selected from a plurality of predetermined vectors having size M; and applying a combining matrix to decode rank d data signals received at the receiver, where the combining matrix is derived from the d predetermined vectors and an inverse of the second channel matrix to project all cross channels from the second transmitter to the d predetermined vectors to reduce or eliminate interference from the second transmitter.