Signal processing method and apparatus thereof
A signal processing and source signal technology, applied in the field of communication, can solve the problems of increasing the influence rate of channel noise, increasing the bit error rate, and the impact of receiving end processing, so as to improve communication efficiency and reduce the effect of bit error rate
Active Publication Date: 2014-10-29
南通金慧网络科技有限公司
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Problems solved by technology
[0006] The solution in the prior art minimizes the influence of clipping on the source signal, but this will cause the source signal to be sent to the receiving end twice, and the source signal will be transmitted twice, which increases the influence rate of channel noise on the source signal. Especially for the peak signal, the bit error rate increases, which has a great impact on the subsequent processing of the receiving end
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[0059] In order to make the object, technical solution and advantages of the present invention clearer, the specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0060] In the embodiment of the present invention, the source signal is limited and then transmitted by the sending end. Since the limited initial signal after limiting is less affected by channel noise in the case of a high signal-to-noise ratio, it can recover to a greater extent out of the original source signal state. According to the recurrence of the signal occurrence probability, the receiving end performs Fast Fourier Transformation (Fast Fourier Transformation, FFT for short) and Inverse Fast Fourier Transformation (Inverse Fast Fourier Transformation, IFFT for short) on the received limited initial signal, A new time-domain signal is formed, so that there is a high probability that a new peak will appear at the sampling point ...
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An embodiment of the invention relates to a signal processing method and an apparatus thereof. The method comprises the following steps that an amplitude-limiting initial signal sent by a sending terminal is received, wherein the amplitude-limiting initial signal is sent after the sending terminal carries out amplitude limiting processing on a source signal; fast Fourier transform is performed on the amplitude-limiting initial signal so that a first frequency domain signal corresponding to the amplitude-limiting initial signal is acquired; inverse fast Fourier transform is performed on the first frequency domain signal so that a time domain signal corresponding to the first frequency domain signal is acquired; the amplitude limiting processing is performed on the time domain signal and the fast Fourier transform is performed on the time domain signal after the amplitude limiting again so as to acquire a second frequency domain signal corresponding to the time domain signal after the amplitude limiting; the second frequency domain signal is compared to the first frequency domain signal so as to acquire a frequency domain compensation coefficient value; the frequency domain compensation coefficient value is used to compensate the first frequency domain signal.
Description
technical field [0001] The present invention relates to the communication field, in particular to a signal processing method and device. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology, which has the characteristics of high spectrum utilization, anti-multipath fading and frequency selective fading, and is widely used in various wireless communications system. [0003] In the time domain, since the OFDM symbol is obtained by adding multiple independently modulated subcarrier signals, the composite signal may generate a relatively large peak power relative to the signal average value, resulting in a large peak-to-average power ratio (Peak to Average Power Ratio, referred to as peak-to-average ratio PAPR), that is: where mean{} represents the mean value of the signal; x n For each subcarrier signal in OFDM. [0004] Due to the high PAPR value in the existing OFDM system, higher requirements...
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IPC IPC(8): H04L27/26
Inventor 徐勇
Owner 南通金慧网络科技有限公司