Method of reducing PAPR of OFDM (Orthogonal Frequency Division Multiplexing) system by adaptive companding technique

Abstract

The invention belongs to the technical field of wireless communication, and provides a method of reducing a PAPR of an OFDM (Orthogonal Frequency Division Multiplexing) system by an adaptive companding technique with a u rate, indexes and k transform combined. The method comprises the following steps: S1, serial-to-parallel conversion is carried out on data, inverse fast fourier transform processing is then carried out, and the optimal companding algorithm is selected; S2, according to the algorithm selected in the first step, a cyclic prefix with a corresponding length is added, and data are transmitted; S3, the type of the cyclic prefix receiving the data is detected, and the cyclic prefix is removed; and S4, according to the type of the cyclic prefix, a corresponding inverse transform algorithm is called to transform signals after the third step, and through fast fourier transform and parallel-to-serial conversion, the signals are demodulated and outputted. The scheme of the invention selects the optimal companding algorithm for each OFDM symbol, the cyclic prefix with a corresponding length is added for marking, and through detecting the length type of the cyclic prefix, a corresponding inverse companding algorithm is called for retrieving the signals. Compared with the traditional method, the method of the scheme of the invention can more effectively reduce the peak-to-average power ratio (PAPR), and larger system bit error rate overhead is not caused.

Description

technical field [0001] The invention relates to the technical field of communication, and relates to a method for reducing the PAPR of an OFDM system by combining multiple compression and expansion technologies. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) is a multi-carrier modulation technology, which has the advantages of good multipath resistance, high spectrum utilization and simple implementation, and is widely used in modern communication systems. The key core technology in the communication system. OFDM modulation technology can convert high-speed serial data streams into multiple low-speed sub-data streams and modulate them on multiple orthogonal sub-carriers, widen the symbol period, and reduce inter-symbol interference caused by channel delay; at the same time, OFDM technology through A guard interval is added between each OFDM symbol to further eliminate the impact of multipath effect...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to reduce the PAPR of the OFDM system while ensuring the bit error rate and computational complexity, thereby improving the performance of the communication system

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