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MQAM-OFDM系统中降低峰均比与残余载波频偏同步联合算法 被引量：5

Joint PAPR Reduction and Residual CFO Synchronization for MQAM-OFDM Systems
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摘要 针对OFDM系统对频偏敏感及峰均比高的问题,提出一种用MQAM调制值的共轭码对残余载波频偏进行跟踪的方法,该共轭码同时可以降低系统峰均比.用频域MQAM数值的共轭来调制导频子载波以抵消相位,降低系统的峰值功率.同时利用这种共轭关系估计残余载波频偏引起的相位旋转,在时域或频域进行纠正.仿真结果表明利用这种共轭码可有效的跟踪频偏,又使系统具有更低的峰均比. A technique for the residual carrier frequency offset（CFO） tracking and the peak-to-average power ratio（PAPR） reduction in multilevel quadrature amplitude modulation（MQAM） based orthogonal frequency division multiplexing（OFDM） systems is presented.The scheme is based on unknown pilot subcarriers modulated by the conjugate of the MQAM information data,cancelling their phases to reduce the maxim power.The conjugate code periodically inserted in the OFDM symbols allows the frequency tracking loop to estimate the phase offset using a derived formula.The simulation investigates the algorithm performance showing that the frequency can be precisely corrected and the PAPR can be reduced with several dB.
作者 戈立军 赵迎新 傅民皓 金宇昂 张冀 吴虹
机构地区 南开大学信息技术科学学院 [
出处 《电子学报》 EI CAS CSCD 北大核心 2011年第1期168-171,共4页 Acta Electronica Sinica
基金 国家自然科学基金(No.60872026) 天津市应用基础及前沿技术研究计划重点项目(No.09JCZDJC16900)
关键词 正交频分复用 峰均比 载波频率偏差 同步 orthogonal frequency division multiplexing（OFDM） peak-to-average power ratio（PAPR） carrier frequency offset（CFO） synchronization
分类号 TN914.4 [电子电信—通信与信息系统]
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参考文献11

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二级参考文献21

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共引文献11

同被引文献44

引证文献5

二级引证文献6

电子学报
2011年 第1期

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