**2.3. On MIMO receiver**

MIMO receiver design is also one of the hot areas of wireless communication research and system development in the last decade. Many receiving techniques have been reported to decode these kinds of vector transmissions. For the linear transmission techniques, the decoders design complexities range from simple linear methods like Zero-Forcing (ZF) and Minimum Mean-Square-Error (MMSE) receivers to complex sphereical sub-optimal decoding and optimal Maximum Likelihood Detections (MLD) [8, 10].
