Interference suppression using parasitic reconfigurable aperture (RECAP) antennas

Most of today's practical wireless systems are interference limited, meaning that the degree of spectral reuse possible is dictated by the size of the coverage area (or cell) and the degree of tolerable interference experienced at the cell edges. Much higher spectral reuse is possible with nodes that can control their radiation patterns to suppress and avoid interference, which is also the basis of spatial division multiple access (SDMA) techniques. A typical goal in interference-limited systems is to maximize the signal-to-interference ratio (SIR) of the nodes in the network. Although SIR minimization is possible with array signal processing, a drawback is the need for additional radio-frequency (RF) chains and digital signal processing (DSP) resources.