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

A signal and frame signal technology, applied in the field of FBMC signal PAPR reduction

Active Publication Date: 2019-09-06
ZHEJIANG UNIV
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Problems solved by technology

However, due to the overlapping of FBMC symbols, when reducing the PAPR of a signal in a symbol interval, the PAPR of a signal in an adjacent symbol

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

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Embodiment Construction

[0075] In order to make the technical solution and advantages of the present invention clearer, the specific implementation of the technical solution will be described in more detail in conjunction with the accompanying drawings:

[0076] Assume that the FBMC system contains N=64 subcarriers, of which 52 are randomly selected as data subcarriers, and its set is expressed as The remaining 12 are free subcarriers. A frame of FBMC signal contains M=10 FBMC symbols, and is modulated by OQAM symbols. The overlapping factor is set to β=4, and the oversampling rate is set to l=4. For such a system, the present invention proposes a PAPR reduction method based on a penalty bump process, which specifically includes the following steps:

[0077] 1. Construct an optimization problem according to the parameters of the FBMC system, that is, take the transmitted symbol as a variable, and take the symbol deformation on the data subcarrier and the transmission power on the free subcarrier a...

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Abstract

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.

Description

technical field [0001] The invention relates to a method for reducing the PAPR of an FBMC signal, in particular to a method for minimizing the PAPR of a frame of FBMC signals by using a penalty concave-convex process when the transmitted signal satisfies a certain deformation constraint. Background technique [0002] FBMC is a multi-carrier modulation method based on pulse shaping, that is, sub-carrier filtering. According to the Heisenberg-Gabor uncertainty principle, the time domain and frequency domain width of a pulse cannot be reduced simultaneously. In order to reduce the out-of-band spectrum leakage, FBMC uses a shaped pulse with a narrow frequency domain width, and the corresponding pulse time domain width will increase. The time-domain width of the shaped pulse used by FBMC is usually several symbol periods, and there will be overlap between adjacent symbols, so FBMC is a non-orthogonal waveform. [0003] Similar to conventional OFDM, FBMC signals have high PAPR, ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 崔方宇蔡云龙赵民建
Owner ZHEJIANG UNIV
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