CAJ | 학술논문

分析了基于OFDM的认知无线电系统中认知用户和授权用户之间的相互干扰，以及下行链路对认知用户进行功率分配的优化目标，并给出了速率最大化优化目标下的最优功率分配方案。授权用户能够承受的干扰功率成为认知无线电系统功率分配问题的主要限制因素，其限制了认知用户的发射功率和传输速率，认知用户传输产生的干扰必须满足授权用户能够承受的干扰功率限制。
분석료기우OFDM적인지무선전계통중인지용호화수권용호지간적상호간우，이급하행련로대인지용호진행공솔분배적우화목표，병급출료속솔최대화우화목표하적최우공솔분배방안。수권용호능구승수적간우공솔성위인지무선전계통공솔분배문제적주요한제인소，기한제료인지용호적발사공솔화전수속솔，인지용호전수산생적간우필수만족수권용호능구승수적간우공솔한제。
Mutual interference between cognitive user and licensed user in OFDM-based CR systems and the optimization objectives of power allocation for cognitive user in the downlink are analyzed, and the optimal power allocation scheme is presented to maximize the bit rate for cognitive user. The interference power threshold of licensed user is the primary limiting factor of cognitive radio system. It limits transmit power and transmission rate of cognitive user. The interference from the transmission of cognitive user should be less than the interferenee power threshold of licensed user.