Patent ID: 8615052

Claim:
A method, comprising: receiving in a mobile communication terminal over a communication channel a Multiple-Input Multiple-Output (MIMO) signal that comprises at least a transmission addressed to the terminal; based on the received signal, estimating in the terminal a Multi-User Signal to Noise Ratio (MU-SNR), which is indicative of a power ratio between the transmission addressed to the terminal and remaining components of the signal, which are assumed to comprise one or more transmissions addressed to one or more other terminals, wherein the MU-SNR is computed under an assumption that the transmissions addressed to the other terminals are precoded with respective precoding vectors that are orthogonal to a precoding vector requested by the terminal for precoding the transmission addressed to the terminal, and wherein computing the MU-SNR comprises averaging the MU-SNR over multiple possible choices of the orthogonal precoding vectors; and transmitting from the terminal feedback that is indicative of the communication channel and is based on the MU-SNR.