Method for optimizing peak-to-average ratio of HPLC dual-mode high-speed wireless system

Abstract

The invention discloses a peak-to-average ratio optimization method of an HPLC dual-mode high-speed wireless system. The method comprises the following steps: 1, defining system parameters; 2, designing a position rule of a frequency domain pilot frequency subcarrier pattern based on the channel characteristic quantity; 3, code element data are mapped to data subcarriers through coding; designing a PN sequence, after BPSK modulation, mapping the PN sequence as an initial pilot frequency pattern to a pilot frequency subcarrier to obtain a frequency domain OFDM symbol, and after IFFT, obtaining a time domain OFDM symbol; 4, performing energy peak searching and PAPR calculation on the time domain OFDM symbol; 5, when the calculated PAPR is smaller than a threshold value, the time domain OFDM symbol is directly sent to a sending end filter; otherwise, recording a numerical value corresponding to the energy peak value in the OFDM symbol sequence; forming a pulse sequence corresponding to the position based on the peak value and the position, and constructing a sequence from a time domain to a frequency domain; 6, only extracting a pilot frequency sequence from the constructed frequency domain sequence; 7, subtracting the extracted pilot frequency sequence from the frequency domain OFDM symbol in the step 3 to obtain a new frequency domain OFDM symbol, and performing IFFT (Inverse Fast Fourier Transform) to obtain a new time domain OFDM symbol; and 8, adding a cyclic prefix to the new time domain OFDM symbol, and sending the new time domain OFDM symbol to a sending end filter.

Description

technical field [0001] The invention relates to the field of communication, especially the field of power line wireless communication, and in particular to a peak-to-average ratio optimization method for an HPLC (high-speed power line carrier) dual-mode high-speed wireless system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier signal modulation method. The significant advantage of this technology is that it can effectively resist frequency selective fading, and compared with traditional parallel data transmission, the spectrum utilization High rate. However, OFDM modulation technology also has an obvious shortcoming that it has a higher peak-to-average ratio PAPR. PAPR is the abbreviation of PeaktoAverage Power Ratio, translated as "peak-to-average power ratio", referred to as peak-to-average ratio. [0003] Various technical standards based on OFDM communication technology have been introduced at home and abroad,...

AI Technical Summary

Problems solved by technology

The higher peak-to-average ratio of OFDM will cause a large difference in power value of OFDM symbols, which requires higher linear operating range of various hardware, especially for the design of the analog front-end power amplifier, so that the overall receiver Put forward higher requirements for performance and cost in different application environments

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