TWO-DIMENSIONAL CHANNEL ESTIMATION FOR MULTICARRIER MULTIPLE INPUT OUTPOUT COMMUNICATION SYSTEMS

摘要

The present invention extends the concept of two dimensional channel estimation to multicarrier multiple input multiple output communication systems using multicarrier modulated transmission signals impinging from a plurality of (NT) transmit antennas at the receiver side. It is assumed that the transmission signals carry a two dimensional data sequence with embedded pilot symbol. As basis of a two-stage channel estimation process the plurality of transmit antennas is divided into disjoint transmission antenna subsets (Amicrol); In a first stage of channel estimation impinging pilot sequences are separated in relation to transmission antenna subsets (Amicrol) by performing a first stage channel estimation to yield tentative estimates of a channel response in a first dimension of transmission. In a second stage of channel estimation impinging pilot sequences are separated in relation to antennas in transmission antenna subsets (Amicrol); by performing a second stage channel estimation for each antenna in each transmission antenna subset (Amicrol) to yield an estimation of the channel response.