An Upper Bound on the Capacity Loss Due to Imprecise Channel State Information for General Memoryless Fading Channels

A remarkably simple upper bound on the capacity loss due to imprecise channel state information (CSI) is presented for single-input single-output (SISO) general memoryless fading channels, (Capacity Loss) ). An extension to the single-input multiple-output (SIMO) case is also provided