Channel quality information (CQI) is a part of channel status information (CSI). If the channel information is a scalar value such as h, general CQI is the power of h divided by the power spectral density of the noise, i.e., |h|^2/N_0 when the noise spectral density is assumed to be N_0. On the other hand, if the channel information is represented by a vector such as \mathbf{h}, CQI is the norm of the channel vector divided by N_0/\alpha, i.e., \alpha ||h||^2/N_0, especially when open-loop transmit diversity transmission schemes are used where \alpha the performance loss factor of the transmit diversity system.

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