Baseband adaptive array processing is a traditional approach to mitigating interference at a digital receiver. In the presence of sufficiently strong interference, this mitigation fails if receiver (RX) front-end components, such as amplifiers and ADCs, are driven into non-linear operation or if the RX responds by decreasing its gain and losing sensitivity to the signal. Instead of requiring costly RX components with high dynamic-range, we explore a novel Multiple-Input Multiple-Output (MIMO) scheme that uses hybrid analog-digital beamforming to mitigate a strong interferer in wideband line-of-sight (LOS) channels. This scheme uses true-time delay analog beamforming within antenna subarrays to mitigate most of the interference ahead of the RX front-end and then linear spatial equalization to mitigate residual interference at baseband. Alamouti space-frequency coding at the transmitter and MIMO receive processing are used to exploit the frequency-selective channel imposed by the analog beamforming stage. We show that this architecture can outperform traditional Single-Input Multiple-Output (SIMO) schemes under strong interference using low complexity processing in a relatively low-complexity hardware implementation. The specific case of inter-vehicular (V2V) LOS channels is considered in detail.
MIMO Hybrid Beamforming for Line-of-Sight Interference Channels
01.06.2022
964649 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Massive MIMO in Line-of-Sight Propagation
IEEE | 2017
|Line-of-Sight MIMO via Reflection From a Smooth Surface
IEEE | 2022
|