Enhanced message propagation method based on channel hardening phenomenon
A phenomenon and message technology, applied in the field of MIMO detection algorithm, to achieve the effect of improving performance, reducing the number of calculations, and improving detection performance
Active Publication Date: 2021-07-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0004] The technical problem to be solved by the present invention is to provide an enhanced message propagation method based on the channel hardening phenomenon. Under the channel hardening phenomenon of the massive MIMO system, the initial probability distribution of the detected symbols is optimized to obtain the final decoding decision; The method provides better detection performance with lower computational complexity
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[0061] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments.
[0062] Such as figure 1 As shown, in the MIMO system, including K receiving antennas and N transmitting antennas, the relationship between the output signal of the receiving antenna and the input signal of the transmitting antenna is as follows:
[0063] y=Hx+n
[0064] In the formula, H represents the channel matrix; n represents Gaussian noise interference, which obeys the mean value of 0 and the variance of The Gaussian distribution of ; x represents the input signal, which is the constellation point modulated by M-QAM, and its set of decoding candidate points is y represents the output signal;
[0065] Multiply H on both sides of y=Hx+n T , and then divided by N, we can get:
[0066] z=Jx+v
[0067] In the formula, z represents H T y; J means H T H; v means H T n; N represents the number of transmitting antennas;
[00...
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The invention relates to an enhanced message propagation method based on a channel hardening phenomenon, provides an initial probability distribution optimization algorithm for detecting symbols, and obtains better iterative convergence performance. The discrete Gaussian distribution is utilized to optimize the initial probability distribution, and the mean value is an estimated value under the channel hardening phenomenon of the large-scale MIMO system. An estimated initial vector is closer to a final solution than a zero vector, and better detection performance can be obtained; furthermore, through an approximate probability updating mechanism, a probability threshold value is set, so that the calculation number of detection symbols in the iteration process can be effectively reduced, and the calculation complexity in the iteration process is reduced; and the compromise between the calculation complexity and the detection performance of the algorithm can be realized by adjusting the threshold value. The message propagation method based on the channel hardening phenomenon can provide better detection performance under the condition of lower calculation complexity.
Description
technical field [0001] The invention relates to the technical field of MIMO detection algorithms, in particular to an enhanced message propagation method based on channel hardening phenomenon. Background technique [0002] Massive multiple input multiple output (Multiple Input Multiple Output, MIMO) system is an emerging technology in 5G. Compared with traditional MIMO systems, it has a significant improvement in energy efficiency, power consumption and link reliability. However, due to the increase of the system dimension, along with the advantages of the massive MIMO system, the cost of computational complexity required for signal processing (data detection, precoding, etc.) is also increasing, and the realization of massive MIMO detection faces many challenges. challenge. The optimal detection algorithm, the Maximum Likelihood (ML) detector, whose computational complexity increases exponentially with the increase of the number of antennas, is impractical in the practica...
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IPC IPC(8): H04B7/0413H04L25/02
CPCH04B7/0413H04L25/024H04L25/0204
Inventor 杨闯唐磊明王正
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS