A Novel Precoder Design for MU-MIMO Networks with Universal Frequency Reuse

The project involves utilization of various precoding techniques such as block-diagonalization (BD), block-diagonalization dirty paper coding (BD-DPC) in a multiuser system on a per-cell basis considering a multicell scenario. The multicell system is been analysed and examined using two modes of operation called competition and coordination. In the former mode, an approach named as noncooperative game (SNG) is considered, in which every base station (BS) selfishly chooses its BD precoding and BD-DPC precoding policy in a distributed way. These strategies are dependent on the information of the inter-cell interference given by its connected mobile station (MS). The existence and distinctiveness of a Nash equilibrium in this SNG are consequently evaluated using the game theory agenda. Whereas, in the coordination mode, in order to boost the network weighted sum rate (WSR) the design of block diagonalization precoders is done mutually over the numerous base stations. As the maximization of WSR is a nonconvex problem, a distributed algorithm is used to acquire atleast a local optimal solution. Eventually, the analysis considering another precoding technique called zero forcing precoding is carried out. Simulation outcomes got through MATLAB illustrates the improvements in the network sum rate as a consequence of utilizing the BD, BD-DPC, ZF precoders in the multicell scenario under the coordination mode in contrast to the competition mode. BD-DPC precoders perform better than the rest of the precoding techniques utilized.