Single-port electronically steerable passive array radiator antenna based space-time adaptive filtering

In wireless communications, there are two problems that the systems suffer from, one is the inter-symbol interference (ISI), the other is the cochannel interference (CCI). Space-time adaptive processing (STAP) is considered to provide superior performance in suppressing both the ISI and the CCI. To reduce the complexity and the cost, using switched parasitic elements or the parasitic elements with variable reactances to change the mutual coupling and so as to provide spatial diversity attracts much attention. The electronically steerable passive array radiator (ESPAR) antenna is one of the parasitic elements based single port antennas with several variable reactances. We propose a single port ESPAR antenna-based space-time adaptive filtering. Unlike the nulls formed by the conventional adaptive antenna, here we develop the potential of jointly using the variable pattern and the temporal equalizer to realize space-time adaptive filtering.