05 2007 1089 1089 4200930 10.1109/TCOMM.2007.896144 http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4200930 05 2007 1089 1089 4200932 10.1109/TCOMM.2007.896141 http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4200932 <![CDATA[Performance of Optimum and Suboptimum Combining Diversity Reception for Binary and Quadrature DPSK Over Independent, Nonidentical Rayleigh Fading Channels