The invention relates to a method for lowering the peak-to-average power ratio of universal filtering multicarrier signals. The method comprises the following steps of: (1) establishing a system model; (2) setting that the sampling points are mutually independent and identical in distribution, and utilizing numerical calculation to analyze the system model; (3) theoretically analyzing a high peak-to-average power ratio (PAPR) of universal filtering multicarriers (UFMC), and obtaining a complementary cumulative distribution function (CCDF); (4) analyzing system parameters of the universal filtering multicarriers (UFMC); (5) utilizing a Largrange method to obtain an optimal solution of the complementary cumulative distribution function; and (6) establishing the relation between filter parameters and the complementary cumulative distribution function (CCDF). According to the invention, the relation between the UFMC peak-to-average power ratio statistic characteristics and the filter coefficients is analyzed, a Largrange optimization method is utilized to obtain the CCDF optimal solution of the UFMC and the expressions of theoretical relations of the filter parameters, the design of a filtering multicarrier system is guided, and the peak-to-average power ratio is further lowered.

Method for lowering peak-to-average power ratio of universal filtering multicarrier signals

The invention belongs to the technical field of wireless communication, and especially relates to an algorithm for reducing a peak-to-average power ratio (PAPR) of a large-scale MU-MIMO-OFDM system by using an alternating direction method of multiplier algorithm. The invention provides a method for reducing the PAPR of the large-scale MU-MIMO-OFDM system without edge information, and provides higher system performance. According to the method provided by the invention, an interference signal is located in a channel zero space, the superimposed interference signal generates almost no influence on the system performance, and an alternating iterative algorithm is used for alternatively iterating parameters to acquire the interference signal at last.

Method for reducing peak-to-average power ratio of large-scale MU-MIMO-OFDM system

The invention discloses an OFDM peak-to-average ratio suppression method based on an alternating direction multiplier method for solving the problem that the existing optimization method for reducingthe OFDM peak-to-average ratio has high computational complexity. The implementation scheme comprises: taking frequency domain OFDM signal data carrier interference as an objective function, taking the peak-to-average ratio and the free carrier power as constraint conditions, establishing a non-convex optimization model; using the alternating direction multiplier ADMM to participate in the optimization process, and seeking the optimal solution, wherein the optimization process consists of two schemes, the ADMM method is directly used for solving in scheme 1, and a KKT point of an optimizationmodel can be guaranteed to be converged in the case of convergence. In the scheme 2, the optimization model is relaxed to obtain a relaxation model to guarantee the convergence, and the KKT point of the optimization model is infinitely approached in the case that the parameters are properly selected. Compared with the existing peak-to-average ratio suppression method, the OFDM peak-to-average ratio suppression method has the advantages of being able to obtain a smaller and more constant peak-to-average ratio, improving the system error rate performance and reducing the computational complexity, and the OFDM peak-to-average ratio suppression method is applied to the technical field of communication to improve the transmission quality of the communication system quality.

OFDM peak-to-average ratio suppression method based on alternating direction multiplier method

The invention discloses an FPGA-based electromagnetic signal interference detection system and method. The system comprises a signal processing module, a carrier frequency calculation module, a signalacquisition module and a signal judgment module. The method comprises the following steps of: (1) segmenting a collected array into multiple frames of data sequences; (2) calculating a frequency spectrum sequence of each frame of data sequence; (3) acquiring a power spectrum mean value sequence of the multiple frames of frequency spectrum sequences; (4) segmenting the power spectrum mean value sequence, and solving test statistics; (5) calculating a first threshold value, and judging whether electromagnetic signal interference exists or not; and (6) calculating the carrier frequency of a to-be-detected interference signal by using a carrier frequency formula. The system and method have the advantages of detection of ultra-wideband signals, high system integration degree, detection of low-energy interference signals and the like.

FPGA-based electromagnetic signal interference detection system and method

The invention provides an FBMC signal PAPR reduction method based on a punishment concave-convex process. The method comprises the following steps: firstly, constructing an optimization problem according to parameters of an FBMC system, namely minimizing a PAPR of a frame of FBMC signal by taking a sending symbol as a variable and taking symbol deformation on a data subcarrier and sending power ona free subcarrier as constraints; secondly, performing equivalent conversion on the optimization problem to obtain an equivalent problem meeting a penalty concave-convex process algorithm framework;secondly, solving an optimization problem according to a two-layer iteration algorithm based on a punishment concave-convex process, updating punishment parameters through outer-layer iteration, fixing the punishment parameters through inner-layer iteration, and solving the punishment problem according to the concave-convex process and a block coordinate descent method; and finally, outputting a calculation result to obtain an FBMC sending signal with a lower PAPR. The PAPR of the FBMC signal is optimized and reduced by utilizing the punishment concave-convex process, and compared with a traditional heuristic iterative algorithm, the method can remarkably reduce the PAPR of the FBMC signal under the condition that the bit error rate is slightly increased.

FBMC signal PAPR reduction method based on punishment concave-convex process

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation, mainly solving the problem of high complexity when the current inhibition OFDM system inhibits a peak-to-average power ratio. The method comprises the following steps: setting an OFDM system peak-to-average power ratio threshold, an idle subcarrier power amplitude limiting threshold and an OFDM symbol pilot subcarrier power constraint which meet requirements of an occasion of the system, and then combining with original OFDM frequency domain symbols and relevant initial variables to establish a non-convex optimization model; then, carrying out relaxation conversion on the model and solving to obtain an expected OFDM frequency domain symbol; and at last, enabling the expected OFDM frequency domain symbol to send out via an antenna after successively undergoing IFFT, parallel-serial conversion, cyclic prefix addition, D/A conversion and radio-frequency amplification. According to the method disclosed by the invention, the OFDM signal peak-to-average power ratio is effectively inhibited; and the method has relatively low computation complexity and can be used in signal transmission of communication field.

OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation

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OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation