MIMO backscatter channel and data transmission measurements

Backscatter modulation is more and more establishing ifself as an approach for low-cost and low-power data transmission. Combined with multi-antenna techniques and channel state information (CSI) an enhancement of range, reliability or spectral efficiency is achieved. However, there has been few literature about gaining CSI for the individual sub-channels of forward an backward link. The contribution at hand deals with multi-antenna backscatter measurements with up to two scatter antennas and two receive antennas, in order to investigate the backscatter channel and the data transmission within a multipath environment at 5.8 GHz. The paper provides a method for determining the individual sub-channels and investigates the multi-antenna backscatter channel capacity and symbol error ratios for backscatter spatial multiplexing using CSI.