Title :
Optimal power allocation for a wireless multi-antenna energy harvesting node with arbitrary input distribution
Author :
Gregori, Maria ; Payaró, Miquel
Author_Institution :
Centre Tecnol. de Telecomunicacions de Catalunya (CTTC), Barcelona, Spain
Abstract :
The lifetime of autonomous wireless nodes can be extended by using energy harvesters in the node. This additional source of energy implies a loss of optimality of the traditional transmission strategies such as waterfilling. In this paper, the precoding strategy along N independent channel uses that maximizes the mutual information in linear vector Gaussian channels for arbitrarily distributed inputs is studied, under non-causal knowledge of the harvested energy over time. Precisely, the optimal right singular vectors and singular values of each precoder are derived. The derivation of the left singular vectors is a computationally hard problem, similarly as in the case of non-harvesting nodes, and is left as an open problem. At each channel use, the observed channel is diagonalized and power is allocated following the proposed MIMO Mercury Water-Flowing solution.
Keywords :
Gaussian channels; MIMO communication; antenna arrays; channel coding; energy harvesting; precoding; vectors; MIMO Mercury water-flowing solution; N-independent channel; arbitrary input distribution; autonomous wireless nodes; left singular vectors; linear vector Gaussian channels; mutual information; nonharvesting nodes; optimal power allocation; optimal right singular vectors; precoding strategy; waterfilling transmission strategy; wireless multiantenna energy harvesting node; Energy harvesting; MIMO; Modulation; Mutual information; Resource management; Vectors; Wireless sensor networks;
Conference_Titel :
Communications (ICC), 2012 IEEE International Conference on
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4577-2052-9
Electronic_ISBN :
1550-3607
DOI :
10.1109/ICC.2012.6364844