Digital despicking method and device

Abstract

The invention provides a digital peak clipping method which comprises: receiving configuration information of physical resource block transmitted by physical layer, determining frequency domain response of core peak clipping vector in present time slot, generating core peak clipping vector according to frequency domain response, determining main lobe width of core peak clipping vector, then compressing multiple side lobes adjacent to main lobe, receiving digital signal after frequency conversion processing, performing peak clipping to signal exceeding in preset threshold utilizing peak clipping sequence. The invention also provides a digital peak clipping device. The inventive method and device utilize physical resource block index for determining core peak clipping vector and compress side lobe of core peak clipping sequence, perform peak clipping for digital signal using compressed core peak clipping vector and preset threshold and then effectively removes all peak point above threshold and can not result in peak resurge, compress side lobe to limit the BER deterioration in a certain degree after peak clipping.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a digital peak clipping method and device. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-carrier system uses orthogonal frequency division channels, so it can support high-speed wireless data transmission without complex equalization technology, and has strong anti-fading And the ability to resist inter-symbol interference, but the main disadvantage of the OFDM system is that it has a large peak-to-average power ratio (PAPR, peak-average powerratio), which directly affects the operating cost and efficiency of the entire system. Peak-to-average ratio problem is a common problem in multi-carrier modulation. In order to overcome the problem of excessive peak-to-average ratio, many peak-cutting methods have been proposed in the prior art, among which the loop-limiting filtering algorithm...

AI Technical Summary

Problems solved by technology

[0008] The above is the original TR algorithm, but in the extended TR algorithm, all the carriers except the virtual subcarriers are reserved: although this extended method does not reduce the spectral efficiency, and the core vector becomes a fixed value, but this The disadvantage of this method is that it will cause interference on all available carriers

[0009] Although these two algorithms in the prior art can well remove peaks at the physical layer, and because the subcarrier reservation algorithm produces very little out-of-band interference, the effect is slightly better than that of the loop limiting filter algorithm; but the existing subcarrier The retention algorithm still has the following three disadvantages:

[0010] First: After the physical layer signal is input to the intermediate frequency, it needs to undergo multi-stage interpolation filtering, and the peak-to-average ratio will increase again after filtering;

[0011] Second: From the iterative algorithm formula of TR above, it can be seen that all signals exceeding the peak clipping threshold must be eliminated one by one; and there may be a large number of sequences exceeding the peak clipping threshold near a peak point, and each time a peak clipping sequence is generated A large number of calculations are required, and if the peak clipping sequence is very long, it will consume a lot of system resources;

[0012] Third: If the subcarriers are allocated non-continuously, the sidelobe of the peak clipping sequence generated according to the peak core vector formula will be very high. While cutting off a peak point, the high sidelobe will deteriorate the quality of adjacent signals, making BER(Bit Error Rate, bit error rate) deteriorates seriously

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