Method for hyperbolic tangent companding transform capable of decreasing peak-to-average power ratio (PAPR) of OFDM (orthogonal frequency division multiplexing) signal

A hyperbolic tangent and signal peak technology, applied in the field of wireless communication, can solve the problems of signal average power increase, deterioration, power amplification signal nonlinear distortion, etc.
CN102404274AInactive Publication Date: 2012-04-04XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2012-04-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for a hyperbolic tangent companding transform capable of decreasing the peak-to-average power ratio (PAPR) of an OFDM (orthogonal frequency division multiplexing) signal, mainly used for solving the problems of non-constant average power and high error rate in the prior art. The method comprises the following realization steps of: (1) performing a quadrature amplitude modulation on the data bit stream generated by an information source, performing a serial-to-parallel conversion then sampling; (2) performing an inverse fast Fourier transform (IFFT) on an over-sampling signal to obtain an original OFDM signal; (3) establishing a companding function based on a hyperbolic tangent function, performing a companding transform on the original OFDM signal, performing a parallel-to-serial conversion then transmitting the signal; (4) calculating the PAPR of a transmitting signal; (5) performing a serial-to-parallel conversion on a receiving signal, then performing a de-companding transform and a fast Fourier transform (FFT); (6) de-over-sampling a FFT signal to obtain an OFDM demodulation signal; and (7) performing a parallel-to-serial conversion and a quadrature amplitude demodulation on the OFDM demodulation signal, then counting an error rate. The method for a hyperbolic tangent companding transform capable of decreasing the PAPR of an OFDM signal disclosed by the invention can efficiently suppress the PAPR, remarkably decrease the error rate, and keep a constant average power; and the method can be widely applied to a new generation of broadband wireless OFDM communication system.
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Description

technical field

[0001] The invention belongs to the technical field of wireless communication, relates to a companding transform method for reducing the peak-to-average ratio (PAPR) of an orthogonal frequency division multiplexing OFDM wireless transmission signal, and can be widely applied to various new generation broadband OFDM wireless communication systems. Background technique

[0002] Orthogonal Frequency Division Multiplexing (OFDM) modulation technology is a high-speed transmission technology in a wireless environment, and after years of development, this technology is increasingly recognized by people. Because the subcarriers in OFDM modulation are orthogonal, the intersymbol interference of the system can be significantly reduced. Compared with single-carrier modulation, OFDM modulation has higher spectral efficiency. Furthermore, by inserting guard intervals, OFDM modulation can be better resistant to multipath fading. Due to these advantages, OFDM modulation i...

Claims

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