An Improved Algorithm Based on Water-filling Power Allocation in Cognitive OFDM System
Hou Xiao-yun · Computer Technology and Development · 2013
In cognitive environment,with the premise of not interfering authorized users,cognitive users can also share spectrum and transmit data with authorized users,make the system transmission rate and band utilization maximized.It proposes an improved algorithm based on water-filling method in cognitive OFDM system.The interference constraint is fully taken into consideration,combined with the noise value of each channel,choose the channels correctly which need power by reasonably sorting the whole channels and optimize the power allocation.The simulation also proves the novel method can make the best use of channels and improve the transmitting rate,and the data is correct.