Title :
Feedback and power optimization in the multiuser downlink under QoS constraints
Author :
Gonzalez-Coma, Jose P. ; Joham, Michael ; Castro, Paula M. ; Castedo, Luis
Author_Institution :
Dept. of Electron. & Syst., Univ. of A Coruna, A Coruna, Spain
Abstract :
We consider the Multiple-Input Single-Output (MISO) Broadcast Channel (BC) with linear filters and perfect Channel State Information (CSI) at reception that is fed back to the transmitter via a limited feedback channel. Our goal is to jointly achieve per-user rate requirements by using minimum total transmit power. We develop a Lloyd´s algorithm to find both optimal quantizer and codebook by means of the duality between Multiple Access Channel (MAC) and BC w.r.t. the average Mean Square Error (MSE), and the properties of standard interference functions.
Keywords :
MIMO communication; access protocols; broadcast channels; mean square error methods; optimisation; quality of service; radio transmitters; radiofrequency interference; BC; CSI; Lloyd algorithm; MAC; MISO; MSE; QoS constraints; broadcast channel; channel state information; feedback optimization; limited feedback channel; linear filters; mean square error; multiple access channel; multiple-input single-output; multiuser downlink; optimal codebook; optimal quantizer; power optimization; standard interference functions; total transmit power; transmitter; Equalizers; Interference; Minimization; Optimization; Quality of service; Receivers; Transmitters;
Conference_Titel :
Communications, Control and Signal Processing (ISCCSP), 2014 6th International Symposium on
Conference_Location :
Athens
DOI :
10.1109/ISCCSP.2014.6877901
