Title :
Transmit beamforming for the MISO Interference Channel with asymmetric link gains
Author :
Vázquez, Miguel Angel ; Pérez-Neira, Ana ; Lagunas, Miguel Angel
Author_Institution :
Centre Tecnol. de Telecomunicacions de Catalunya (CTTC), Barcelona, Spain
Abstract :
This paper proposes a transmit beamforming technique to cope with the problem of the Multiple Input Single Output Interference Channel (MISO IC). In this scenario, the achievable sum-rate is highly conditioned by the inter-user interference. Furthermore, optimizing the sum-rate is known to be a cumbersome problem. In order to deal with this problem, we approximate the sum-rate when the desired received signal power level is higher than the multiuser interference power level (i.e. when the Signal-to-Interference Ratio (SIR) is high). For that case, the sum-rate expression can be optimized distributively and it leads to a transmit beamformer that outperforms the existing decentralized techniques when the channel gains are asymmetric. Numerical simulations show the performance of the proposed technique which improves the existing decentralized designs for the MISO IC.
Keywords :
MIMO communication; approximation theory; array signal processing; optimisation; radiofrequency interference; wireless channels; MISO interference channel; asymmetric link gains; channel gains; interuser interference; multiple input single output interference channel; multiuser interference power level; numerical simulations; received signal power level; sum-rate approximation; sum-rate expression; sum-rate optimization; transmit beamforming technique; Antennas; Array signal processing; Integrated circuits; Interference; Receivers; Signal to noise ratio; Transmitters; Array signal processing; MISO Interference Channel;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-0045-2
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2012.6288602