A Weighted Fractional Fourier Transform Extended Hybrid Carrier Transmission Method
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A fractional Fourier, hybrid carrier technology, applied in the phase modulation carrier system and other directions, can solve the problems of poor anti-channel performance and low reliability, and achieve the effect of improving performance, good compatibility, and reducing bit error rate
Active Publication Date: 2022-07-19
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 one: as figure 1 and figure 2 shown. A weighted fractional Fourier transform extended hybrid carrier transmission method described in this embodiment specifically includes the following steps:
[0034] Step 1. Perform baseband constellation mapping on the 0 and 1 bit data generated by the source to obtain the modulation result after the 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 represented as X i′ ,i′=1,2,3,...,M, where 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 are the i'th frame data X, respectively i′ 1st, 2nd, ..., 2nd in N data;
[0037] For a current data block, the ...
specific Embodiment approach 2
[0062] Embodiment 2: This embodiment differs from Embodiment 1 in that: the The expression is:
[0063]
[0064] where e is the base of the natural logarithm, is the identity matrix, θ 0 ∈[0,2π) is the transformation parameter, i is the imaginary unit, is the permutation matrix.
specific Embodiment approach 3
[0065] Embodiment 3: This embodiment differs from Embodiment 1 in that: the The expression is:
[0066]
[0067] where e is the base of the natural logarithm, is the identity matrix, θ 0 ∈[0,2π) is the transformation parameter, i is the imaginary unit, is the permutation matrix.
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Abstract
A weighted fractional Fourier transform extended mixed carrier transmission method belongs to the technical field of wireless communication. The invention solves the problems of poor performance against channel fading and low transmission reliability of the existing single-carrier communication method. The present invention designs an extended mixed carrier signal transmission method in order to improve the bit error performance of the single carrier communication system. By performing extended mixed carrier modulation on the signal after constellation mapping, a time-domain energy-averaged anti-fading signal form is formed for use in In communication transmission, the average processing of channel time-selective fading is realized, so that the energy loss of a single symbol is shared by multiple symbols participating in the transformation process, which greatly reduces the probability of misjudgment caused by excessive distortion of a single symbol. It effectively reduces the bit error rate under the fading channel, and improves the performance of the single-carrier system against channel fading. At the same time, the method has better compatibility with the existing single carrier system. The present invention can be applied to the technical field of wireless communication.
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 hybrid 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 of low peak-to-average power ratio and insensitivity to frequency offset. 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, in order to improve the transmission reliability of the current single-carrier system, the weighted fractional Fourier transform has been gradually studied as a signal processing method with a complete theoretical system, low complexity and easy engineering implementation. certain results. However, the existing hybrid carrier communication method is limited by the four-compone...
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