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In this letter,an Opportunistic Interference Cancellation(OIC) is first introduced as a rate control strategy for secondary user in cognitive wireless networks. Based on the OIC rate control method,an optimal power control strategy for multichannel cognitive wireless networks is proposed. The algorithm aims to maximize the total transmit rate of cognitive user through appropriately controlling the transmit power of each subchannel under the constraint that the interference temperature at the primary receiver is below a certain threshold. Three suboptimal power control methods,namely Equal Power Transmission(EPT) ,Equal Rate Transmission(ERT) and Equal Interference Transmission(EIT) ,are also proposed. The performances of the proposed power control methods are compared through numerical simulations.
Based on the OIC rate control method, an optimal power control strategy for multichannel cognitive wireless networks is. The algorithm aims to maximize the total transmit rate of cognitive user through decent control of the transmit power of each subchannel under the constraint that the interference temperature at the primary receiver is below a certain threshold. Three suboptimal power control methods, ie Equal Power Transmission (EPT), Equal Rate Transmission (ERT) and Equal Interference Transmission (EIT), are also proposed. The performances of the proposed power control methods are compared through numerical simulations.