Low Complexity Precoding for Large Millimeter Wave MIMO Systems
Millimeter Wave (mm-Wave) systems must overcome heavy signal attenuation to support high-throughput wireless communication links. The small wavelength in mm-Wave systems enables beamforming using large antenna arrays to combat path loss with directional transmission. Beamforming with multiple data streams, known as pre-coding, can be used to achieve even higher performance. Both beamforming and pre-coding are done at baseband in traditional microwave systems. In mmWave systems, however, the high cost of mixed-signal and Radio Frequency chains (RF) makes operating in the pass-band and analog domains attractive.