Precoding Algorithm for Interference Suppression in Multi-Carrier Systems in Fast Time-Varying Scenarios
A multi-carrier system, a technology for suppressing interference, applied in the field of precoding algorithms, to achieve the effects of low complexity, improved orthogonality, and reduced inter-carrier interference
Active Publication Date: 2022-05-20
NANKAI UNIV
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[0008] The present invention proposes a precoding algorithm for multi-carrier system interference suppression in fast time-varying scenarios, which solves many problems in the application of traditional interference suppression algorithms in fast time-varying scenarios
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[0022] The method of the present invention will be described in detail with reference to the drawings and embodiments.
[0023] (1) Deriving the precoding optimization criterion based on the SNR criterion to replace the traditional SINR optimization criterion.
[0024] For a multi-user MIMO system, first discuss the SINR expression of user k at the receiving end:
[0025]
[0026] Computing the precoding matrix w with the SINR optimization criterion has a very high complexity. Therefore, the optimization criterion is modified, and the SNR is used to reflect the performance of the system. The leakage power of user k is expressed by the following formula:
[0027]
[0028] Under the condition of limited transmit power, the solution problem of the precoding algorithm based on the SNR criterion can be expressed as:
[0029]
[0030] By Rayleigh_Ritz:
[0031]
[0032] in representation matrix and The largest eigenvalue generated. The condition for taking the ...
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The invention discloses a precoding algorithm used for suppressing interference in a multi-carrier system in a fast time-varying scene. The method comprises the steps of: deriving the precoding optimization criterion based on the SNR criterion to replace the traditional SINR optimization criterion; performing precoding transformation on the transmitted signal vector to obtain the data vector to be transmitted; performing precoding transformation on the obtained The data symbols are upsampled by N times, and then circularly convolved with the pulse shaping filter to obtain the final output. The precoding algorithm based on the SNR criterion adopted in the present invention has low complexity, and its computational complexity is basically the same as that of the zero-forcing precoding algorithm; the precoding algorithm based on the SNR criterion is designed with noise in mind, especially at low Under the condition of signal-to-noise ratio, its performance is significantly better than zero-forcing linear precoding algorithm. The original data vectors are not orthogonal to each other, and the matrices obtained after precoding transformation are orthogonal to each other. After such a precoding operation, the orthogonality between the subcarriers of the GFDM system can be improved and the intercarrier interference can be reduced.
Description
technical field [0001] The invention relates to a precoding algorithm for suppressing interference in a multi-carrier system in a fast time-varying scene Background technique [0002] With the further improvement of the social development level, people put forward higher requirements for the capacity and business types of future wireless communications. The mobile Internet that supports ultra-high speed and high traffic density, the Internet of Things that supports a large number of terminal devices and meets more stringent delay and reliability requirements have become the two main driving forces for the development of mobile communications today. They will make mobile communications The technology expands to a wider range of industries and fields, bringing users a better experience. With the popularization of smart terminals and the growth of high-speed data services, future wireless communication systems need higher system capacity and spectrum utilization to meet rapidl...
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IPC IPC(8): H04B7/0456H04L25/03H04L27/26
CPCH04B7/0456H04L25/03821H04L27/2627Y02D30/70
Inventor 吴虹刘兵张钰婷耿雪陈琢赵迎新张万鹏
Owner NANKAI UNIV