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Method for reducing peak-to-average power ratio of OFDM signal

A peak-to-average power ratio and average power technology, which is applied in the field of wireless and wired communications, and can solve the problems of reducing the minimum distance of constellation points and increasing the bit error rate.

Inactive Publication Date: 2010-07-14
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Since the OFDM time-domain signal is clipped, a noise will be introduced to the frequency-domain data block, thereby reducing the minimum distance between constellation points, and the bit error rate of the system will increase.

Method used

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  • Method for reducing peak-to-average power ratio of OFDM signal
  • Method for reducing peak-to-average power ratio of OFDM signal
  • Method for reducing peak-to-average power ratio of OFDM signal

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[0043] The modulation mode adopts two cases of QPSK and 16HEX, the numbers of subcarriers are 256 and 1024 respectively, and the clipping thresholds are 7.96dB and 13.96dB respectively, at CCDF=10 -4 , the preset peak-to-average power ratio threshold is 7dB.

[0044] 1 Reduction effect of peak-to-average power ratio

[0045] Simulation results show that the present invention can well reduce the peak-to-average power ratio of OFDM signals without increasing the bit error rate of the system. at CCDF=10 -4 , the number of subcarriers is 256, and the modulation method is QPSK, the partial amplitude augmentation method can achieve a PAPR reduction effect of 5.0dB when the number of iterations is 28, and the improved partial amplitude augmentation method only uses 2 iterations The effect of reducing the peak-to-average power ratio by 5.0dB is gone, which shows that the convergence algorithm can indeed reduce the computational complexity of the partial amplitude augmentation method...

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Abstract

The invention discloses a method for reducing the peak-to-average power ratio of the OFDM signal, which reduces the peak-to-average power ratio of the OFDM signal by enlarging the amplitudes of certain data symbols in a data block. The method first clips the OFDM signal according to a certain threshold (since time domain clipping can bring noise into a frequency domain data block), and the frequency domain data block with noise is processed in the following way: the projection of each distorted data symbol on the original data symbol is calculated, the projection is used to substitute the original data symbol if the module of the projection is larger than the module of the original data symbol, otherwise the original data symbol is kept unchanged, and thereby a new frequency domain data block and a new time domain signal are obtained; if the peak-to-average power ratio of the new time domain signal meet requirements, the new time domain signal is added with a cyclic prefix and then sent to a high-power amplifier, otherwise the steps are repeated. Under the premise of not affecting the error rate, the method greatly reduces the peak-to-average power ratio of the OFDM signal, and can reduce the complexity of calculation.

Description

technical field [0001] The invention belongs to the technical field of wireless and wired communication using orthogonal frequency division multiplexing (OFDM), and in particular relates to a new method for increasing partial amplitudes to reduce the peak-to-average power ratio of OFDM signals. Background technique [0002] In the mobile wireless channel, the signal arrives at the receiving antenna through a time-varying multipath channel from the transmitting antenna, which will produce time-selective fading and frequency-selective fading. The time-varying characteristics of the channel cause the broadening of the signal spectrum, leading to the Doppler effect, which causes the signal to fade selectively over time. Orthogonal Frequency Division Multiplexing (OFDM) technology is proposed according to the frequency-selective fading characteristics of multipath channels in the frequency domain. OFDM converts a serial high-speed channel into multiple low-speed parallel sub-cha...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 江涛周洋管丽丽屈代明
Owner HUAZHONG UNIV OF SCI & TECH
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