Millimeter-Wave Index Modulation for Vehicular Downlink Transmission

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Millimeter-Wave Index Modulation for Vehicular Downlink Transmission

Cheng, Xiang / Gao, Shijian / Yang, Liuqing

This chapter works on tailoring an index modulation (IM) for mmWave vehicular downlink access. The proposed wideband precoded beamspace modulation (wPBM) stems from the well-known spatial modulation. However, a careful adaptation has been conducted to combat time selectivity and remain compatible with hybrid wideband massive multiple-input multiple-output (mMIMO) systems. Relying on the previously developed hybrid block diagonalization (HBD-) based transceiver framework, we successfully extend the single-user wPBM to a downlink multi-user scenario. Following a dedicated low-complexity beamspace selection scheme, geometric mean decomposition is applied over the high-quality equivalent digital channel. Consequently, all users will be guaranteed to enjoy the fairness of Quality of Service in error performance. In addition, the performance merits keep remarkable in high mobility, indicating that wPBM is a promising candidate for vehicular communications.