Research On Reducing PAPR In Wireless Communication

Orthogonal Frequency Division Multiplexing(OFDM)technology has been established as a key in wireless communication systems due to its high spectral efficiency,robustness against multipath fading and interference,ease of adaptability to various channel conditions and efficient implementation.The physical layer technology is also the focus of research and attention in the field of wireless communication technology.However,the peak-to-average power ratio(PAPR)will degrade the system performance.It is not suitable for current power amplifiers,especially in the uplink.In recent years,researchers and scholars both at home and abroad have been conducting in-depth research.In many studies,the trade-off between peak-to-average power ratio(PAPR),signal redundancy,and computational complexity has not been carefully considered.Some of the most advanced PAPR reduction methods have higher bit redundancy and higher Computational complexity.This paper analyzes and studies the proposed PAPR reduction method.After considering the complexity of the algorithm,the redundancy of information and the effect on the error rate of the OFDM system,proposes a new PAPR reduction method named PAPR reduction through random constellation mapping.The proposed method first implements the change of the frequency domain data content of an OFDM symbol through a constellation mapping sequence.The constellation mapping sequence is different from the conventional constellation.It is a sequence composed of constellation.The constellation in the sequence is the constellation of the same modulation,but the mapping in each constellation is not necessarily the same,and these constellation diagrams are randomly generated.We randomly generate N sets of identical constellation sequences at the sending end and the receiving end and number them.We transform the results of these N sets of constellation mapping sequence maps into the time domain by the inverse discrete Fourier transform and compute their PAPR value,from which the smallest one is selected as the transmission signal,is transmitted together with the constellation map sequence number at the time of transmission,thus achieving the purpose of PAPR reduction.The simulation results show that the signal PAPR is significantly reduced,and the degree of information redundancy calculation is not high.