Capacity for Correlated MIMO Backscatter Systems

This paper introduces a special method to construct channel coefficient for describing the general channel correlation scenario in the multiple-input multiple-output (MIMO) radio frequency identification (RFID) system, where two types of channel correlation are involved. Also, we derive an approximate expression for the capacity and discuss the impact of channel correlation on the capacity. In particular, the performance of the capacity in low SNR regime has been investigated to gain more insight. Monte-Carlo simulations are performed to validate our analytical results.