SINR based limited feedback scheduling for MIMO-OFDM heterogeneous broadcast networks

Limited feedback scheduling algorithms for multiuser MIMO-OFDM is discussed for heterogeneous network in the sense that SNR for all users are not equal. Users at a particular distance from base station are grouped together and have same SNR assuming that they have same multipath profile and shadowing effect. In this paper, closed-loop system is considered where mobile terminals feedback channel quality information in the form of SINR. In this paper, two SINR based limited feedback scheduling algorithms are discussed for MIMO-OFDM heterogeneous broadcast networks. The throughput and feedback load performances of these algorithms are evaluated. The expression for the net achievable system throughput for a closed-loop system with SINR feedback is presented for MU MIMO-OFDM broadcast channel heterogeneous network with and without grouping of adjacent subcarriers. It is observed that algorithm II achieves higher throughput than algorithm I at the cost of slight increase in feedback load for both with and without clustering of adjacent subcarriers. Extensive simulations have been carried out to validate the results presented in this paper.