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A technology of fractional Fourier transform and mixed carrier, which is applied in the phase modulation carrier system and other directions, and can solve the problems of poor anti-channel performance and low reliability
Active Publication Date: 2021-04-27
HARBIN INST OF TECH
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[0003] The purpose of the present invention is to solve the problem of poor performance against channel fading and low transmission reliability of the existing single-carrier communication method, and proposes a weighted fractional Fourier transform extended mixed carrier transmission method
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specific Embodiment approach 1
[0033] Specific implementation mode one: as figure 1 with figure 2 shown. A weighted fractional Fourier transform extended hybrid carrier transmission method described in this embodiment, the method specifically includes the following steps:
[0034] Step 1. Perform basebandconstellation mapping on the 0 and 1 bit data generated by the information source, and obtain the modulation result after constellation mapping;
[0035] Step 2. Group the modulation results obtained in step 1: starting from the first bit of the modulation result, divide the modulation result into M data blocks of equal length, and the length L of each data block is 2 N , N is a positive integer, each data block corresponds to a frame of data, and the i'th frame data is expressed as X i′ , i'=1,2,3,...,M, M is the total number of data blocks;
[0036] x i′ =[x 0 x 1 ... x L-1 ],x 0 , x 1 ,...,x L-1 Respectively for the i′th frame data X i′ 1st, 2nd, ..., 2nd of N data;
[0037] For a curre...
specific Embodiment approach 2
[0062] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the The expression is:
[0065] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one is: the The expression is:
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Abstract
The invention discloses a weighted fractional Fourier transform extended hybrid carrier transmission method, and belongs to the technical field of wireless communication. According to the invention, the problems of poor channel fading resistance and low transmission reliability of the existing single carrier communication method are solved. The invention designs an extended hybridcarrier signal transmission method for improving the bit error rate performance of a single carrier communication system, an extended hybridcarrier modulation is carried out on a signal after constellation mapping to form an anti-fadingsignal form with equalized time domain energy for communication transmission, and the equalizationprocessing of channel time selective fading is realized, so the energy loss of a single symbol is shared by a plurality of symbols participating in the transformation process, the probability of misjudgment of the single symbol due to overlarge distortion is greatly reduced, the bit error rate under a fading channel is effectively reduced, and the performance of resisting channel fading of a single carrier system is improved. Meanwhile, the method has good compatibility with an existing single-carrier system. The present invention can be applied to the technical field of wireless communications.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a weighted fractional Fourier transform extended mixed carrier transmission method. Background technique [0002] In the field of wireless communication technology, the single-carrier system is widely used in digital communication systems due to its advantages such as low peak-to-average power ratio and insensitivity to frequency offset. However, due to its poor anti-frequency dispersion performance, single-carrier communication There is still room for improvement in the performance of the method under channel conditions with deep fading in the time domain. In recent years, due to the improvement of the transmission reliability of the current single-carrier system, the weighted fractional Fourier transform has gradually been studied as a signalprocessing method with a complete theoretical system, low complexity and easy engineering implementation, and ...
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