关键词: 正交频分复用, 峰均功率比, 功率分配, 子载波数, 导频信号

Abstract: To solve the problem of high Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems, an efficient PAPR reduction scheme called OPAR was proposed based on optimized power allocation. This paper also analyzed the relationship between power efficiency of power amplifier and PAPR, and deduced the closed form formulation of power allocation between superimposing pilot signal and data signal. OPAR could allocate optimized power quickly with the given sub-carrier number and probability threshold of PAPR. Simulation results and comparison with the existing schemes demonstrate that the proposed OPAR scheme can obtain better performance in PAPR reduction.

Key words: Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), power allocation, sub-carrier number, pilot signal