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Phase annoying method of signal peak even power rate suppressed quadrature frequency division complex

A technology of peak-to-average power ratio and phase perturbation, which is applied in frequency division multiplexing system, orthogonal multiplexing system, interference to communication, etc. It can solve the problem of large amount of calculation, poor bit error rate performance, Problems such as low encoding rate

Inactive Publication Date: 2005-03-30
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

The most direct solution is to remove the peak value in the waveform before the OFDM signal is amplified, which deteriorates the bit error rate (BER) performance of the system; the coding scheme needs to calculate the peak-to-average power ratio of all information sequence combinations, which requires a large amount of calculation and is only applicable to For OFDM systems with few carriers; the information codewords are mapped to Gray sequences or M sequences, and the coding rate is low

Method used

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  • Phase annoying method of signal peak even power rate suppressed quadrature frequency division complex
  • Phase annoying method of signal peak even power rate suppressed quadrature frequency division complex
  • Phase annoying method of signal peak even power rate suppressed quadrature frequency division complex

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Embodiment Construction

[0019] see figure 1 , a phase perturbation method for suppressing the peak-to-average power ratio of an OFDM signal in the present invention, comprising: information element phase perturbation and suppression element phase perturbation, in the OFDM using the phase perturbation method to suppress the peak-to-average power ratio In the application system, the modulation vector of the subcarrier sequence is composed of information element components and suppression element components, including the following steps:

[0020] 1) When the peak-to-average power ratio of the time-domain signal is greater than the set threshold, a pseudo-random phase is superimposed on the phase of the information element,

[0021] 2) The perturbation phase of the suppressor is obtained by gradient algorithm search; the number of suppressors and the number of discrete points on the entire circle in the search of the suppressor phase are artificially selected to realize the trade-off between information...

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Abstract

The method includes phase perturbation of information element and phase perturbation of suppression element. In orthogonal FDM system of using phase perturbation method for suppressing peak average power ratio, modulation vector is composed of component of information element and component of suppression element. Characters are that the method includes following steps: (1) when peak average power ratio is larger than threshold value setup in time domain, pseudo-random phase is added to information element phase; (2) perturbation phase of suppression element is obtained through searching by using gradient algorithm; (3) after sampling and demodulating, receiver deletes information in frequency domain on relevant sub carrier wave directly so as to obtain useful information.

Description

technical field [0001] The invention relates to a phase disturbance method for suppressing the peak-to-average power ratio (PAR) of Orthogonal Frequency Division Multiplexing (OFDM). Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a high-speed broadband transmission technology in a wireless environment. In view of the frequency selective response of wireless channels, the main idea of ​​OFDM technology is to divide a given channel into multiple sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit sub-carrier sequences in parallel, so The frequency response of the sub-channel is relatively flat, and the signal bandwidth is smaller than the relevant bandwidth of the channel, which greatly reduces the inter-symbol interference; the sub-carrier spectrums covering each other will not interfere with each other due to the orthogonal nature, which improves the spectrum utilization of the channel. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04J1/00H04J11/00H04K3/00H04L27/00
Inventor 刘扬石寅
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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