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[The world is demanding more from wireless communication services now than ever before. Many advanced wireless communication techniques, such as multiple-input multiple-output (MIMO), cognitive radio (CR), energy harvesting (EH) communications have attracted lots of research attention. For a...
[In this chapter, we introduce water-filling algorithms to solve power allocation problems. Two water-filling approaches are presented. One is the conventional water-filling (CWF); and the other one is the proposed geometric water-filling (GWF). GWF is further extended to efficiently solve a...
[In this chapter, we first discuss the single user MIMO system and its optimal power allocation solution. Then, we present two classes of MIMO system models: MAC (multiple access channel) and BC (broadcast channel). Their optimal power allocation computation is provided. More solid and more...
[The radio spectrum is a precious resource that demands efficient utilization as the currently licensed spectrum is severely underutilized . Cognitive Radio (CR) [2–4], which adapts the radios operating characteristics to the real-time conditions, is the key technology that allows flexible,...
[There has been recent research effort on understanding data transmission with an energy harvesting transmitter that has a rechargeable battery for green communications [1–4]. Recently, based on [3, 5] further investigates the issues of power allocation problems to minimize the grid power...
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