PTS double-layer searching algorithm for reducing FBMC-OQAM peak-to-average power ratio (PAPR)

Abstract

The invention relates to wireless communication systems, and provides an algorithm for reducing the peak-to-average power ratio (PAPR) of an FBMC-OQAM system. The algorithm is characterized in that classified subsequences are re-grouped on the basis of subsequence classification of the traditional PTS, so that a double-layer subsequence classification structure is formed, and layered searching is carried out for rapid searching. Firstly, each data block in the FBMC-OQAM system is divided into V subsequences according to the same method adopted by the PTS, the V subsequences are grouped into D groups, and each group comprises V / D subsequences; secondly, the layered searching is carried out according to different layers, a bottom algorithm aims to reduce the PAPR of the current data block, and a top algorithm aims to handle mutual effects between the adjacent data blocks, so that the overall signal PAPR of the FBMC-OQAM system is reduced. The algorithm provided by the invention has the advantages that due to the adoption of the layered searching method, the searching sequence length in each layer is relatively small, so that searching times are reduced to a certain extent, and signal distortion is avoided.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a technique for reducing the peak-to-average ratio in filter bank multi-carrier technology. Background technique [0002] As the technical research of the fifth generation mobile communication (5G) is a subject of great concern in the industry, the design of multiple access and multiplexing schemes for 5G is being carried out in depth. Although Orthogonal Frequency Division Multiplexing (OFDM) technology has been adopted by many wireless standards, OFDM is no longer suitable for the development of 5G due to its strong out-of-band radiation and its sensitivity to carrier spectrum offset. Based on the improvement of OFDM, effective multiple access and multiplexing technologies such as filter bank multi-carrier (FBMC) and universal filter multi-carrier (UFMC) have been proposed. [0003] FBMC is a multi-carrier technology that alleviates the impact of carrier frequency offset ...

AI Technical Summary

Problems solved by technology

Since the OFDM system was proposed, the problem of reducing its peak-to-average ratio has always been the focus of research. In the past few years, many excellent techniques for reducing PAPR have been proposed [Rahmatallah Y, Mohan S.Peak-To- Average Power Ratio Reduction in OFDMSystems:A Survey And Taxonomy[J].IEEE Communications Surveys&Tutorials,2013,15(15):1567-1592.], but there are still few ways to reduce PAPR for FBMC-OQAM systems

[0050] However, if this algorithm is used, it is necessary to traverse W MV phase factors, where W is the total number of optional phase rotation factors, and its complexity is as high as O(W MV )

We call this algorithm the ideal PTS algorithm (I-PTS) of FBMC-OQAM. This amazing complexity is unacceptable and cannot be realized in practice.

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