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Method for suppressing peak-to-average power ratio of wireless OFDM (Orthogonal Frequency Division Multiplexing) signal based on segmented distribution optimization

A technology of distribution optimization and signal peaks, applied in the direction of multi-frequency code systems, etc., can solve the performance degradation of peak-to-level ratio PAPR and bit error rate BER, the distribution of small-amplitude signals and large-scale signals increases, and the nonlinear distortion of power amplified signals. And other issues

Inactive Publication Date: 2014-07-09
XIDIAN UNIV
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Problems solved by technology

Therefore, the μ-law companding method will cause the power of the companded signal to reach the saturation region of the power amplifier, thereby causing nonlinear distortion of the power amplified signal; for this reason Tao Jiang proposed in "Exponential Companding Technique for PAPR Reduction in OFDM Systems" The exponential companding method is proposed. The basic idea is to convert the amplitude distribution of the original OFDM signal into a uniform distribution. However, this method will increase the distribution of small-amplitude signals and large-amplitude signals, resulting in peak-to-average ratio PAPR and bit error rate. BER performance declines; Jun Hou proposed the trapezoidal companding method in "Trapezoidal companding scheme for peak-to-average power ratio reduction of OFDM signals", the basic idea is to convert the amplitude distribution of the original OFDM signal into a trapezoidal distribution, but in Under a certain bit error rate BER performance requirement, the peak-to-average ratio PAPR performance improvement of this method is very limited

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  • Method for suppressing peak-to-average power ratio of wireless OFDM (Orthogonal Frequency Division Multiplexing) signal based on segmented distribution optimization
  • Method for suppressing peak-to-average power ratio of wireless OFDM (Orthogonal Frequency Division Multiplexing) signal based on segmented distribution optimization
  • Method for suppressing peak-to-average power ratio of wireless OFDM (Orthogonal Frequency Division Multiplexing) signal based on segmented distribution optimization

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[0037] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0038] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0039] Step 1: Perform OFDM modulation on the input bit stream, and then obtain the original OFDM signal x after upsampling n , wherein, n=0, 1, ..., JN-1, J represents the upsampling factor, and N represents the number of subcarriers included in the OFDM system.

[0040] Step 2: Construct the companding function of the piecewise distribution.

[0041] 2.1) Define the probability density function f(|z|) of the output signal amplitude |z| of the companding function:

[0042] f ...

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Abstract

The invention discloses a method for suppressing a peak-to-average power ratio of a wireless OFDM (Orthogonal Frequency Division Multiplexing) signal based on segmented distribution optimization, mainly solving the problem that in the prior art, the peak-to-average power ratio suppressing effect is poor and the average power is not constant. The method for suppressing the peak-to-average power ratio of the wireless OFDM signal based on the segmented distribution optimization comprises the following steps of: (1), performing OFDM modulation on an input bit stream, and obtaining an original OFDM signal after upsampling; (2), establishing a companding function based on an improving target, and performing companding conversion on the original OFDM signal; (3), sending the signal after the companding conversion, and calculating the peak-to-average power ratio thereof; (4), calculating a decompanding function, and performing decompanding conversion on the received signal; and (5), downsampling the signal after the decompanding conversion, restoring the original bit stream after OFDM demodulation, and counting an error code rate. The method for suppressing the peak-to-average power ratio of the wireless OFDM signal based on the segmented distribution optimization can suppress the peak-to-average power ratio of the OFDM signal effectively, can ensure the constancy of the average power before and after signal companding, has relatively good error code performance, and can be widely applied to various next-generation broadband wireless OFDM communication systems.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a peak-to-average ratio (PAPR) suppressing method of orthogonal frequency division multiplexing OFDM modulated wireless transmission signals, 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 multi-carrier modulation technology, which has been widely used in mobile communication systems because of its advantages of high spectrum efficiency and strong anti-multipath fading ability. However, the main disadvantage of OFDM is the peak-to-average ratio (PAPR), which can cause severe performance degradation when using nonlinear power amplifiers. In order to ensure the linear amplification of the signal, the peak-to-average ratio PAPR requires the power amplifier to have a large input backoff, which greatly reduces the effic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 王勇王丽花葛建华李毅宫丰奎李靖杨超
Owner XIDIAN UNIV
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