New compression extension method for reducing OFDM signal peak to average ratio

A signal peak-to-average ratio, signal technology, applied in the field of communication, can solve the problems of large signal distortion, difficulty in practical use, and increase of system bit error rate, etc., and achieve the effect of high practical value

Inactive Publication Date: 2007-07-25
SUN YAT SEN UNIV
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Problems solved by technology

[0017] Methods 2 and 3 reduce the peak-to-average ratio by improving the statistical distribution characteristics of the signal. The research found that the signal distortion caused by these two methods is too l

Method used

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  • New compression extension method for reducing OFDM signal peak to average ratio
  • New compression extension method for reducing OFDM signal peak to average ratio
  • New compression extension method for reducing OFDM signal peak to average ratio

Examples

Experimental program
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Example Embodiment

[0040] Example 1

[0041] As shown in FIG. 1, the source of communication system randomly generates 256000 bits. After the QPSK modulation, the 256 subcarriers are assigned one by one, and then orthogonal modulation is realized by IFFT to obtain the original OFDM signal. The average power of the signal is normalized in this embodiment. Then, the amplitude of the restricted signal is obtained, and the compression expansion change is made by the new pressure spread function proposed by the present invention; before the receiving end of the communication system performs the FFT operation, the received signal amplitude is reversed by the reverse function of the above-described press. Pressure transformation. The pressure-confusing function is

[0042] y = 6 σ s ( 1 - exp ( - x ...

Example Embodiment

[0046] Example 2

[0047]The basic flow of another simulation experiment is also shown in Figure 1. The source end randomly generates 640,000 bits, and after DQPSK modulation, they are assigned to 64 sub-carriers one by one, and then orthogonally modulated by IFFT to obtain the original OFDM signal. Then, the amplitude of the complex signal is obtained, and the new companding function proposed by the present invention is used for companding transformation, and then the processed signal is converted from parallel to serial, after digital / analog conversion and up-conversion, it is sent to the additive Gaussian white Noise channel.

[0048] After the signal received by the receiving end is down-converted and A / D converted, the signal is converted from serial to parallel, and then the amplitude of the complex signal is obtained. The inverse companding function proposed by the present invention is used for the inverse companding transformation, and then Perform FFT operation on the sig...

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Abstract

The method comprises: after sending end makes inverse fast Fourier transform (IFFT), it determines the amplitude value of OFDM signals. The invention provides a companding function for making transform in order to make the transformed amplitude value submits to the linear function distribution and the phase of signal keep unchanged; the receiving end makes inverse companding transform for amplitude value of the received signals, and then makes fast Fourier transform (FFT) and decode for it.

Description

technical field [0001] The invention relates to a compression and expansion method for reducing the signal peak-to-average ratio in an orthogonal frequency division multiplexing communication system, which is a method for suppressing the peak-to-average ratio by performing nonlinear companding on the OFDM signal amplitude, and belongs to the field of communication technology . Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique with high channel utilization, which can effectively overcome the inter-symbol interference caused by multipath fading, so it is used in wireless communication systems such as WLAN. got applied. However, since the OFDM signal is the result of the superposition of multiple sub-channel signals, there will be a large instantaneous peak value in the composite signal in the transmitter of the system, resulting in an excessive peak-to-average power ratio (Peak to Average Power Ratio, PAPR ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 曹若云张琳秦家银
Owner SUN YAT SEN UNIV
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