The MIMO antenna array techniques promise to help fulfil the requirements of future networks by offering high space diversity-gain and enhanced data rates. However, there are some considerable challenges with MIMO techniques that must be overcome. The most serious of which is the co-channel interference impairment. In order to overcome such a challenge, precoding is introduced as an excellent choice for complementing the MIMO systems. Precoding diverges in two branches: the linear algorithms which can achieve reasonable performance at relatively low complexity levels, and the non-linear...