Algorithm for reducing PAPR (Peak to Average Power Ratio) in GFDM system on basis of random filter allocation

Abstract

The invention requests to protect an algorithm for reducing a PAPR (Peak to Average Power Ratio) in GFDM system on basis of random filter allocation, and relates to a wireless communication system. Just like all multi-carrier systems, due to superposition of output signals, the GFDM system still has a high PAPR. Multiple methods for reducing a PAPR in an OFDM system exist, but due to the characteristics of the GFDM system, an effect obtained by directly adopting the method for reducing the PAPR in the OFDM system is not ideal. Aiming at the problems of the current research, according to the structural characteristic that the GFDM system can flexibly select a filter, a novel method for reducing the PAPR in the system is disclosed. By randomly allocating different filters to each path of subcarrier, the novel method aims to destroy phase consistency in the signal superposition process so as to effectively inhibit the PAPR, and cannot cause distortion of the signals. Theoretical analysis and a simulation result prove superiority of the algorithm.

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] At present, many wireless communication standards rely on OFDM. As an important multi-carrier technology, OFDM divides high-speed data streams into several parallel low-speed data streams transmitted on different sub-carriers, which can effectively combat inter-symbol interference. (ISI), but OFDM still has limitations. For this reason, new multi-carrier modulation technologies such as GFDM have emerged as the times require. As an alternative waveform for 5G, GFDM has many advantages that OFDM does not have: data symbols can be propagated through a two-dimensional module structure across time and frequency domains, and an adjustable pulse shaping filter is used to make the system highly flexible, etc. . [0003] However, like the OFDM multi-carrier syst...

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Problems solved by technology

Although there are many ways to reduce PAPR in OFDM system, due to the structural characteristics of GFDM system, the effect of directly borrowing the method of reducing PAPR in OFDM system is not ideal

[0004] Literature [Sendrei L, S, Michailow N, et al.Iterative receiver for clipped GFDM signals[C] / / IEEE 24th International Conference Radioelektronika.2014,pp.1-4.] use iterative receiver to process GFDM received signal (Clipped-GFDM), which will lead to signal distortion, although multiple iterations can effectively eliminate the nonlinear noise caused by clipping, but the more iterations, the more complex the calculation; literature [Sharifian, Z, Omidi, M.J, Farhang, A, etal.Polynomial- based compressing and iterative expanding for PAPR reduction inGFDM[C] / / IEEE 23rd Conference on Electrical Engineering, 2015, pp.518-523.] presents a polynomial companding algorithm (PCT-GFDM), which is a pair One-map, and restore the signal at the sending end by iterative reception at the receiving end. However, this algorithm will increase the amount of calculation and sacrifice BER performance while reducing PAPR.

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