... Recent Advances in Wireless Communications and Networks 62 2.1.3 Maximum ratio combining Fig. 3 shows the block diagram of the MRC scheme. MRC is a linear combining scheme, in which ... 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., 20 06) . In this section, we first present various receive diversity schemes, including selection combining, switch combining, equal-gain combining (EGC), and MRC. The well-known...