Coding method and system for reducing peak-to-average ratio in OFDM system

Abstract

The invention relates to a coding method and system capable of reducing peak-to-average power ratio in an OFDM system, and relates to the technical field of optical communication. A sending end and a receiving end are respectively provided with a basis matrix based on ZC sequence, wherein the basis matrixes are subjected to cyclic shift to obtain different cyclic matrixes; at the sending end, data to be sent is multiplied by different cyclic matrixes to obtain peak-to-average power ratios after calculation, the group of data having the lowest peak-to-average power ratio is selected for transmission, and meanwhile, information about how to obtain the cyclic matrixes serves as auxiliary information and is transmitted along; and at the receiving end, the auxiliary information in the received data is extracted, the cyclic matrixes selected by the sending end is obtained according to the auxiliary information and the basis matrixes, inverse transform is carried out on the cyclic matrixes to obtain inverse matrixes, and the inverse matrixes are multiplied by the received data to obtain decoded data. The method and system reduce PAPR effectively; calculation amount and transmitted additional information are small; and system cost is reduced favorably.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a coding method and system for reducing the peak-to-average ratio in an OFDM system. Background technique [0002] With the further development of technology, there is a huge demand for data services carried by wireless access and optical fiber broadband. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing), as a new type of digital modulation technology, has the advantages of high spectral efficiency and anti-multipath fading, and can effectively solve multipath fading and bandwidth-limited problems in communication channels. problem, has very broad development prospects. The random accumulation of multiple sub-carriers in OFDM will generate a large signal peak, which is represented by a high PAPR (Peak to Average Power Ratio, peak-to-average ratio), which requires the amplifier to have a large linear dynamic range, thus in...

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Problems solved by technology

Due to the limited type and number of precoding matrices, how to construct the matrix has become a difficult point of this algorithm, and the fixed precoding matrix cannot guarantee the optimal PAPR. Using different precoding matrices may get lower PAPR, and the cost is the need More digital processing, and the need to communicate additional additional information, increases system cost

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