Method and apparatus for estimating a channel quality indicator (CQI) for multiple input multiple output (MIMO) systems

摘要

Systems and methods are provided for determining a channel quality indicator (CQI) in a transmission system associated with a diversity transmission scheme. A plurality of independent diversity branches are identified in the diversity transmission scheme. Each one of the independent diversity branches may correspond to a different portion of the effective channel and may include any suitable combination of frequency, time, and/or spatial components of the effective channel or of any wired or wireless paths or combinations of the same. An effective Signal-to-Noise Ratio (SNR) value is computed for each one of the identified independent diversity branches. The computed effective SNR values are combined for the identified independent diversity branches to generate a CQI value.

主权项

1. A method for determining a channel quality indicator (CQI), the method comprising:
identifying a plurality of combinations of (i) a precoding matrix selected from a plurality of precoding matrices, (ii) a cyclic delay phase selected from a plurality of delay phases, and (iii) a transmitted stream selected from a plurality of transmitted streams; computing, using receiver circuitry, an effective Signal-to-Noise Ratio (SNR) value for each one of the identified combinations; and averaging the computed effective SNR values over the identified combinations to determine a CQI value.