Multi-beam receive scheme for millimetre wave wireless communication system

Different from the conventional receive scheme for millimetre wave (mmWave) communication, this study proposes a multi-beam receive scheme to improve the quality of the received signal and enhance the robustness of the system. The authors proposal is firstly formulated as an optimisation problem, where each signal received by different beams is combined through phase compensation to harvest more transmission energy. Then the original problem is divided into a series of sub-problems and an analytical solution is further obtained for each sub-problem. Furthermore, considering the spatial sparsity of the mmWave channel, they propose further a low-computational complexity algorithm by choosing a few candidate codewords with non-negligible receive signal power. Numerical results show that their proposal achieves remarkable performance improvements even with a small size codebook and is more robust for different scenarios, especially for a non-line of sight scenario. Compared with doubling receive antennas to obtain diversity gain, their proposal obtains larger signal-to-noise ratio gain while using fewer hardware resources.