Butler Matrix Frequency Diverse Retrodirective Array Beamforming: An Energy-Efficient Technique for mmWave Networks

Figure 1

Schematic illustration of the proposed BM-FDRA in mmWave communications: (a) BM-FDRA with orthogonal beams for serving four users concurrently; (b) BM-FDRA with orthogonal beams for serving eight users concurrently. Note the proposed BM-FDRA attempts to transmit information using the orthogonal beams over the same frequency band simultaneously to different users. This system model can be extended to any .

(a)

(b)