HYBRID BEAMFORMING WITH TWO BIT RF PHASE SHIFTERS IN SINGLE GROUP MULTICASTING

DEMİR Ö. T., TUNCER T. E.

IEEE International Conference on Acoustics, Speech, and Signal Processing, Shanghai, Çin, 20 - 25 Mart 2016, ss.3271-3275 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Shanghai
  • Basıldığı Ülke: Çin
  • Sayfa Sayıları: ss.3271-3275
  • Anahtar Kelimeler: Transmit beamforming, multicast beamforming, hybrid beamforming, semidefinite programming
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

In this paper, an efficient hybrid beamforming architecture combining analog and digital beamforming is proposed to reduce the number of radio frequency (RF) chains. It provides a good compromise between the higher degree of freedom of digital beamforming and hardware cost and complexity. In this hybrid system, two bit RF phase shifters are used as analog beamformers due to the fact that this enables the conversion of the combinatorial optimization problem to a continuous programming formulation. The overall optimization problem for the joint design of digital and analog beamforming weights is formulated as a quadratic-cost problem which can be solved iteratively by exact penalty and semidefinite programming. Simulation results show that the proposed method designs hybrid beamformer effectively and it performs better than antenna selection for the given multicasting problem.