Analysis of a MIMO OFDMA heterogeneous feedback system employing joint scheduling and spatial diversity in Nakagami fading channels

We present a unified analytical framework to jointly examine spatial, spectral, and multiuser diversity in a general multiuser MIMO OFDMA system. Spectral diversity originates from frequency domain opportunistic scheduling enabled by the OFDMA technique, and is influenced by partial feedback design. We propose a heterogeneous partial feedback design method which adapts users' feedback resources to their frequency domain channel statistics. We investigate this adaptive feedback design by employing the best-M partial feedback strategy, and derive closed form expressions for the average spectral efficiency and bit error rate with different spatial diversity schemes under the generalized Nakagami-m fading channels. We also examine the interplay among the diversity effects using our heterogeneous feedback design as well as the channel fading effect through numerical results.