Quasi-lossless compression method based on corrected OFDM sub-carriers

Abstract

The invention discloses a quasi-lossless compression method based on corrected OFDM sub-carriers. The method comprises the steps that at a sending end, an information source sequence is subjected to constellation map mapping and then is modulated to the sub-carriers through conjugate antisymmetry for IFFT to a time domain; a sub sequence 1 is extracted out through a down sampling device, data of the rest of sampling points are used as a sub sequence 2 and subjected to the companding process; at a receiving end, each received OFDM symbol sequence is divided into two sub sequences, and the sub sequence 2 is subjected to de-companding; every two sub sequences are combined to form a complete OFDM time-domain signal which is transformed to a frequency domain through FFT and recovered on a constellation map; the signal is transformed to the time domain through IFFT, a sub sequence 3 is extracted out through the down sampling device, and the sub sequence 3 and the sub sequence 1 are subjected to subtraction to obtain a time-domain signal deviation value; the deviation value is subjected to FFT, and through judgment of magnitude of the deviation value and a preset threshold value, the sub-carriers with constellation point deviation are determined; the deviation values of constellation mapping points are compensated on corresponding sub-carriers and transformed to the time domain through the IFFT.

Description

technical field [0001] The present invention relates to the field of communication technology, and more specifically, to a quasi-lossless compression method based on partial sampling points for auxiliary correction of OFDM subcarriers that can effectively compress OFDM time-domain signals to be transmitted in high-reliability media such as optical fibers. Background technique [0002] Broadband access network is one of the most important strategic public infrastructures for my country's economic development in the early 21st century, and the development of broadband access network plays an important supporting role in building a well-off society in an all-round way. In August 2013, the State Council issued the "Broadband China" strategy and implementation plan, the purpose of which is to strengthen the strategic guidance and system deployment of national broadband construction, and accelerate the healthy development of my country's broadband infrastructure. [0003] Fiber to...

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Problems solved by technology

[0011] Aiming at the disadvantage that the existing compression algorithm cannot obtain a higher compression ratio, the present invention proposes a quasi-lossless compression method for correctin

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