Method for reducing peak-to-average power ratio of OFDM signal
A peak-to-average power ratio and power-to-average technology, which is applied in the field of reducing OFDM signal peak-to-average power ratio based on multi-tone reservation, can solve the problem of not fully meeting the needs of real communication development, high computational complexity, and convergence of OFDM signal peak-to-average power ratio slow speed etc.
Active Publication Date: 2012-08-15
HUAZHONG UNIV OF SCI & TECH
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[0007] It can be seen that the traditional multi-tone reservation method, which reduces the peak-to-average power ratio of OFDM signals, has the disadvantages of slow convergence speed and high computational complexity, which cannot fully meet the development needs of actual communication.
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[0037] Specific parameter scheme: the number of subcarriers in the OFDM system is 256, the number of reserved subcarriers is 32, the reserved positions are randomly determined, the input signal is a QPSK modulated signal, and the shear wave threshold is set to 2.5.
[0038] The simulation results show: at CCDF=10 -3 When the peak-to-average power ratio of the OFDM signal is reduced to 3.8dB, the traditional multi-tone reservation technology requires at least 13 iterations, while the new method only needs 2 iterations to achieve the same effect. It can be seen that the new method can greatly reduce the computational complexity.
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The invention discloses a method for reducing the peak-to-average power ratio of an OFDM signal. The traditional tone reservation technology is improved, and a peak eliminating signal is multiplied by an optimal factor, so the convergence rate of the traditional tone reservation technology is improved, better performance of reducing the peak-to-average power ratio of the OFDM signal is maintained, and the peak-to-average power ratio of an OFDM signal is quickly reduced under the low-complexity condition.
Description
technical field [0001] The invention belongs to the technical field of wireless communication using orthogonal frequency division multiplexing (OFDM) signals, and in particular relates to a method for reducing the peak-to-average power ratio of OFDM signals based on multi-tone reservation. 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, resulting in the Doppler effect, causing the signal to selectively fade 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 technology refers to dividing the frequency domain into multiple sub-channels, and ea...
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IPC IPC(8): H04L27/26
Inventor 江涛李海波周洋
Owner HUAZHONG UNIV OF SCI & TECH