Hybrid Precoding for Energy Conservation in HetNets

Abstract

Millimeter wave is one of the promising technologies that will be deployed in 5G mobile
communication. It has potential of providing higher bandwidth, fast speed and low latency. However, it
needs a large array of antennas at base station and mobile station to counteract its high path loss. To use full
potential of mmWave frequency band, massive MIMO technology is considered which helps in providing
the higher beamforming gain. Energy consumption is one the concerning factor in telecommunication
industry. So, to enable sustainable 5G network, the various techniques can be exploited without sacrificing
the quality of services, particularly in precoding. Precoding is one the techniques to improve the strength of
MIMO systems. This research aims to design hybrid precoding which can be optimized in mobile
communication as it attains the optimal performance with less power consumption. SDN is also explored to
solve the computational complexity of the massive MIMO system. The conventional analog precoding is not
considered due to low system performance in massive MIMO system. While the digital precoding is
neglected due to hardware complexity and high-power consumption. By using the hybrid precoding
approach, the spectral efficiency for massive MIMO system is improved. The overall sum rate of the
proposed design achieved under the perfect channel condition is around 10 bps/Hz at 20 dB with 10 channel
paths with respect to analog beam-steering which is very close to single user rate i.e.,13.5 bps/Hz. With the
help of MATLAB, all numerical simulations on the different parameters is carried out.