Method and device for eliminating spectrum inversion, and receiver

Abstract

The invention discloses a method for eliminating spectrum inversion. The method comprises the following steps of: detecting whether a received signal has a spectrum inversion problem or not; if the received signal has the spectrum inversion problem, checking whether a frequency point index value FFT_IDX of fast Fourier transform is 0 or not; if the frequency point index value FFT_IDX is 0, adopting an orthogonal inphase frequency domain signal of the 0th sub-carrier of the received signal as an inphase orthogonal frequency domain signal of the 0th sub-carrier of an output signal; and if the frequency point index value FFT_IDX is not 0, adopting the orthogonal inphase frequency domain signal of the (N-FFT_IDX)th sub-carrier of the received signal as the inphase orthogonal frequency domain signal of the (N-FFT_IDX)th sub-carrier of the output signal, wherein N is the number of sampling points of the fast Fourier transformer, and the frequency point index value FFT_IDX is an integer ranged from 0 to N-1.

Description

technical field [0001] The present invention relates to a method for eliminating spectrum inversion in a receiver, and in particular to a method for eliminating spectrum inversion using a frequency domain de-interleaver (FREQUENCY DE-ITERLEVER), its device and its receiver machine. Background technique [0002] At present, the development of communication technology has become more and more mature. In daily life, any type of communication device can be seen all the time. The receivers in the communication devices all have a tuner (TUNER) for receiving wireless signals or wired signals, and filtering out the received signals in a specific frequency spectrum, so as to obtain the information required by the communication device. However, after the received signal is processed by the tuner, the receiver will sample and down-convert the received signal (DOWN CONVERSION), which may cause the problem of spectrum inversion (I / Q SWAP) of the received signal, that is, the received si...

AI Technical Summary

Problems solved by technology

In short, when the spectrum inversion occurs in the traditional receiver 600, the locking time of the entire communication device will be prolonged due to re-synchronization

[0011] In addition, there are some studies and literatures that use other methods to check the signals of the in-phase and quadrature channels, so as to check the detection time of the spectrum inversion in advance, but the methods used to solve the problem of spectrum inversion The receiver synchronizes the received signal only after the signals of the in-phase and quadrature channels

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