... complexity and the extent of channel state information required at the receiver, we will introduce four types of combining schemes, including selection combining, switch combining, EGC, and MRC, in ... (Giannakis et al., 2006). In this section, we first present various receive diversity schemes, including selection combining, switch combining, equal-gain combining (EGC), and MRC. The well-known ... implement the selection combining scheme by accumulating and averaging the received signal power, consisting of both signal and noise power, for all antenna branches, and selecting one branch with...