Low Complexity Millimeter Wave Point-to-point Communication: Interference Assessment of BPSK vs QPSK Decomposition

Power amplification and spectral efficiencies could be optimized with transmitter structures employing several branches, each one associated to a signal component of the symbol to be transmitted, with an amplifier directly connected to an antenna or an antenna array. Under these conditions the signal components transmitted by the several branches are associated to different beams to increase the separation among data streams from different users. However, even in these conditions interference among users can occur due to superposition of radiation beams carrying signal components from different users. Since the physical security level assured by these structures is not negatively affected, it is crucial the assessment of interference effects in such systems. Under certain limits in misalignments, simulation results show that beam interference has low impact on system performance.