认知 OFDM 系统中一种改进的注水功率分配算法

摘要

认知环境中，认知用户在不干扰授权用户的前提下，和授权用户能够同时共享频谱并传送数据，使得系统传输速率和频带利用率最大化。文中主要针对认知 OFDM 系统，在注水算法的基础上提出了一种改进算法。该算法全面考虑了干扰温度限制，结合各子信道的噪声值，通过对信道进行合理排序，从中正确选取需要分配功率的信道并合理分配功率，从而使得系统功率分配达到最优。仿真结果证明该算法能够充分利用信道，提高传输速率，验证了数据的正确性。%In cognitive environment,with the premise of not interfering authorized users,cognitive users can also share spectrum and trans-mit 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.