AMP detection algorithm based on NSGA2 algorithm training and system for implementing AMP detection algorithm
A detection algorithm and algorithm technology, applied in the field of wireless transmission, can solve problems such as poor bit error performance, high algorithm complexity, and low bit error rate, and achieve the effect of effective performance improvement
Pending Publication Date: 2022-04-12
NANJING UNIV OF POSTS & TELECOMM
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At present, some widely used signal detection algorithms have some defects, some have a low bit error rate, but the algorithm complexity is high, and some have a low algorithm complexity, but the bit error performance is poor, which reduces the reliability of the communication system
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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0045] It should be emphasized that in the process of describing the present invention, various formulas and constraints are distinguished by using consistent labels, but it does not exclude the use of different labels to mark the same formulas and / or constraints. The purpose of such setting is In order to illustrate the features of the present invention more clearly.
[0046] The invention provides an improved AMP detection algorithm based on NSGA2 algorithm training, and takes a single-send-single-reception OTFS system composed of a base station and four users as an example to elaborate. Assume that the channel is divided by the delay spread by τ i , i=1,2,...P, the Doppler spread is v i , i = 1, 2, ... P composed of p taps, the modulation mod...
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The invention provides an AMP detection algorithm and system based on NSGA2 (non-dominated multi-objective optimization genetic algorithm) training. User bit streams are mapped to corresponding constellation points; carrying out ISFFT (Inverse Fast Fourier Transform) on the signal, mapping the signal into a time-frequency domain, and converting the time-frequency domain signal into a time-domain signal flow through IFFT; enabling the time domain signal flow to pass through a Jakes channel model; frequency domain signals of each user are taken out and subjected to SFFT conversion, and corresponding time delay Doppler signals are obtained; carrying out AMP iteration detection on the obtained signal, calculating the minimum MSE, and stopping iteration when the MSE is smaller than a threshold value; a current signal demodulation process is completed, a fixed number of iterations is determined according to an iteration number trend chart, and optimal parameters are obtained through genetic algorithm multi-objective optimization; and putting the optimal parameter into an AMP detection algorithm for detection. According to the method, the optimal number of iterations is determined while the performance is considered by calculating the iteration convergence rate, the convergence factor of each layer of iteration is regarded as an independent parameter, and compared with a fixed parameter, the effective performance of the parameter trained through the NSGA2 algorithm is improved.
Description
technical field [0001] The invention belongs to the field of wireless transmission, and in particular relates to an improved AMP detection algorithm based on NSGA2 algorithm training and a system for implementing the algorithm. Background technique [0002] Wireless communication is the most important field in digital communication, however, the characteristics of high mobility and high data rate of wireless communication system will lead to problems such as multipath fading, delay spread, scarcity of spectrum resources and so on. In addition to the above-mentioned problems caused by the characteristics of wireless communication, the explosive growth of network terminal equipment and the increasingly diversified wireless mobile communication services in recent years have made it a very urgent research focus to improve the data transmission rate of wireless communication systems to meet the needs of communication services. According to information theory, the maximum informat...
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IPC IPC(8): H04B17/336H04B17/391H04L27/34
CPCY02D30/70
Inventor 侯晓赟赵健博
Owner NANJING UNIV OF POSTS & TELECOMM