降低多载波信号峰值平均功率比的新相位方案

New phasing scheme to reduce peak-to-average power ratio for a multicarrier signal

针对等幅且各子载波等频率间隔的多载波信号,从瞬时包络功率出发,采用代数方法推导了一种降低峰值平均功率比(PAPR)的新相位方案。通过数值计算对峰值平均功率比的减小作用进行了验证,并给出了采用Newman相位方法计算的结果以便比较。数值结果表明,采用这种新的相位方案得到的PAPR不大于3 01dB,且随着子载波数的增大而接近2 65dB,克服了信号的非线性失真。

For a multicarrier signal with equal amplitudes and equally spaced frequencies, a new phasing scheme to reduce the peak-to-average power ratio(PAPR) is derived from the instantaneous envelope power in an algebraic method in this paper. In addition, a numerical evaluation is also performed to examine the reduction effect of PAPR and the results calculated by using Newman phases method are given for comparison. Numerical results show that the new phasing scheme yields a PAPR less than 3.01dB for up to 300 subcarriers and that the PARPR approaches 2.65 as the subcarrier number increases.