摘要
本文深入研究了无线 OFDM 系统的预失真技术,针对 OFDM 信号的高峰平比特性及高功率放大器带来的非线性失真影响,提出了基于查表法的基带自适应预失真器解决方案,给出其自适应递归算法及查询表内容的更新策略;并利用计算机仿真对本方案的性能进行了分析,仿真结果表明:本方案可以有效改善放大器的非线性特性。
Adaptive predistortion technique in digital wireless OFDM modulation scheme is investigated. To combat the large peak-to-average power ratio of OFDM signals and the nonlinear distortion introduced by high power amplifier (HPA), a novel predistorter based on the look-up-table suitable for the OFDM transmitte is proposed. The adaptive algorithm and the modification method of look-up-table are also presented. Through computer simulation, the performance of the predistorter proposed for OFDM system is analyzed. Simulation results prove the validity and efficient performance of proposed scheme.
出处
《电路与系统学报》
CSCD
2004年第5期49-52,90,共5页
Journal of Circuits and Systems
基金
国家数字视频广播关键技术研究基金
