Method for reducing PAR of OFDM system

Abstract

The invention provides a method for reducing the peak-to-average ratio in an orthogonal frequency division multiplexing system and includes the following steps: the input data of the orthogonal frequency division multiplexing system is converted into parallel data by a series-parallel conversion; scrambling codes are inserted, and the signal sequences with the lengths of K of the orthogonal frequency division multiplexing system are evenly divided into M blocks and the K/M is ensured to be an integer and a scrambling code is inserted into the end of each block and the total bit M of the scrambling codes are inserted; then the inverse fourier transform and series-parallel conversion are carried out rapidly; the peak-to-average ratios of signal sequences, which meet the setting requirements are calculated and output; if not meeting the requirements, scrambling codes are carried out. The method adopts a scrambling code insertion technology and can be simply realized at both sending terminal and the receiving terminal of the system without transmitting any auxiliary information. Compared with the scheme of the existing sequence insertion, the method can better reduce the peak-to-average ratio of the OFDM system on the premise of not increasing the complexity of the system.

Description

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AI Technical Summary

Benefits of technology

The present in this new technology allows for more efficient communication between devices over wireless networks while reducing interference from other signals or noise sources like radio waves. It uses randomized sequences instead of fixed ones that are sent through specific paths before reaching their destination device. This makes it easier to process data accurately compared to previous techniques such as selecting maps based on certain criteria. Overall, these technical improvements improve network efficiency and reduce delays caused by transmitting unnecessary information during message transfer.

Problems solved by technology

Technologies described include techniques called "interleaving," where two types of symbols (called "sub carries") alternate between being aligned during reception while maintaining their alignment. Interlacing helps improve the quality of received waveforms compared to traditional pulse compression algorithms like QAM. Additionally, research suggests combining these techniques together to further enhance overall performance. Overall, technical problem addressed in this patents relates to improving the peak -to- average ratio performance of Orthogonal Frequency Division Multiplex Access (OFDMA) based wireless communications technologies, particularly in terms of reduced power consumption and increased bandwidth usage rates.

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