降低OFDM系统PAPR的TR方法及其FPGA实现

Tone reservation technique for OFDM PAPR reduction and its implementation with FPGA

针对正交频分复用(OFDM)系统的高峰均功率比问题,介绍了一种改进的载波保留(TR)方法,该算法应用时域核函数构造时域核函数矩阵并进行缩放参数优化,迭代过程复杂度低且性能良好。设计了一种简化的OFDM发射机方案以验证该算法在实际系统中的有效性,给出了在FPGA上实现该方案的整体架构及关键模块。硬件测试结果表明该OFDM发射机的峰均比得到了有效抑制,验证了该TR算法的正确性,证明其有较好的应用前景。

An improved tone reservation （TR） method for the high peak-to-average power ratio （PAPR） problem of orthogonal frequency division multiplexing （OFDM） system is studied. The algorithm exploits the time-domain kernel to construct time-domain kernel matrix, which is scaled by a scaling vector generated through an optimization problem, then the peak reduction signal is obtained with low complexity and high performance in the iterations. A simplified OFDM transmitter is designed to validate the effectiveness of the algorithm in the practical systems, then the structure and the key modules of the transmitter on FPGA is illuminated. The hardware test results show that the PAPR of the OFDM transmitter is reduced effectively, so the validity of the algorithm is verified, and it has good application value.