Carrier-free Amplitude-Phase Modulation Method and Demodulation Method Based on Probability Shaping
A carrier-free amplitude and phase modulation technology, which is applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., can solve the problems of poor transmission performance and high transmission power, and achieve the effects of realizing transmission capacity, reducing transmission probability, and achieving performance
Active Publication Date: 2021-06-11
NANJING UNIV OF INFORMATION SCI & TECH
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However, in the constellation mapping used by the current CAP modulation technology, each symbol point in the constellation diagram is represented by the same number of bits, and the inner constellation points that require lower energy for transmission and the outer constellation points that require higher energy for transmission are represented by the same number of bits. Probabilistic transmission has the disadvantages of high transmission power and poor transmission performance
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[0024] Such as figure 1 As shown, the working process of the modulation method of the present invention is: input a single-way binary bit stream to the probability shaping constellation mapping unit, complete the non-uniformly distributed twelve-point square constellation mapping after the single m(k) element processing, and output one-way The single-channel complex signal generated by the complex signal is upsampled to the unit root A(i). According to the sampling rate of the filter, M times upsampling is performed to realize the M times period extension of the signal on the frequency spectrum, and the upsampled single-channel complex signal is divided into the complex signal A(n) through the real part and imaginary part separation unit. The real part and imaginary part of A(n) number are divided into two parallel real number signals a(n) and b(n). Next, a(n) and b(n) respectively enter the finite impulse response filter for shaping filtering to obtain s 1 (t) and s 2 (t)....
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The invention discloses a probability shaping-based non-carrier amplitude-phase modulation and demodulation method, which includes a probability shaping constellation mapping step, a demapping step and a non-carrier amplitude phase modulation and demodulation step, and the probability shaping constellation mapping step includes determining the non-uniform probability There are three sub-steps of forming a constellation mapping table, performing non-uniform distribution bit interleaving, and performing constellation mapping. The probabilistic forming constellation de-mapping step includes three sub-steps of determining a non-uniform probability forming constellation mapping table, performing constellation de-mapping, and non-uniform distribution bit de-interleaving. The present invention can reduce the transmission probability of higher-energy constellation points, increase the transmission probability of lower-energy constellation points, reduce the average transmission power of the system through the shaping gain brought by probability shaping, and realize the transmission capacity of the short-distance communication system. promote. At the same time, by rearranging the bits in the bit stream, the errors are randomized, the impact of burst errors in the channel is reduced, and the performance of the bit error rate is improved.
Description
technical field [0001] The invention relates to a carrier-free amplitude-phase modulation method and a demodulation method, in particular to a carrier-free amplitude-phase modulation method and demodulation method based on probability shaping. Background technique [0002] In recent years, the vigorous development of the information industry has led to an explosive growth in the demand for data communication bandwidth. In 2014, the total amount of global data was 6×10 21 bits, which is almost equivalent to the data volume of 1 trillion 720P movies, and this number will reach 4×10 in 2020 25 . While these large amounts of data are transmitted over long distances, they also need to be stored and processed at terminals including data centers and even personal computers. With the development of cloud computing, big data, and the Internet of Things, more data will be mainly stored in data centers. Data calls, online playback, downloads, calculations, and program operations req...
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IPC IPC(8): H04B10/516H04B10/67
CPCH04B10/516H04B10/676
Inventor 刘博毛雅亚张丽佳任建新忻向军哈特孙婷婷赵立龙王俊锋宋真真刘少鹏吴泳锋王凤姜蕾
Owner NANJING UNIV OF INFORMATION SCI & TECH