Directional Space-Time Waveform Design for Interference-Avoiding MIMO Configurations

We consider the problem of directional space-time waveform design for proactive interference avoidance in multiple-input multiple-output (MIMO) link configurations. We propose to instruct the transmitter to communicate with the intended receiver at a given code sequence and angle-of-arrival that are jointly optimized to maximize the maximum attainable pre-detection signal-to-interference-plus-noise ratio (SINR). More specifically, directional transmissions to the intended receiver are achieved by designing space-time waveforms that maximize SINR at the output of the max-SINR receiver filter. Simulation of the proposed adaptive interference-avoiding space-time waveform designs in MIMO link configurations show superior performance in terms of post-filtering SINR and bit-error-rate (BER) when compared to interference-suppressive non-adaptive receiver designs. Joint optimization of the code sequence and array response vector at the transmitter demonstrate that the proposed spacetime waveform designs perform within 2 dB from the maximum attainable SINR at the intended receiver.