Spectrum Allocation Strategy for Cognitive Radio User Based on OFDM
Yanfei Sun · Jisuanji gongcheng · 2011
Two algorithms using Orthogonal Frequency Division Multiplexing(OFDM) are proposed after reviewing research on spectrum allocation in multiuser Cognitive Radio(CR).The optimal algorithm obtains the total transmission power through the lower limit of primary users' Signal to Interference Ratio(SIR),and allots every user subcarriers and power according to Lagrange's theorem.The hypo-optimal algorithm uses a prorating gene to determine equity of allocation.Results are obtained through restricting the users' SIR.Simulations results show both algorithms are effective compared with Frequency Division Multiple Access(FDMA) allocation,and satisfy the needs of CR.