Method for improving performance of low-intermediate frequency receiver, storage medium and receiver

Abstract

The invention discloses a method for improving the performance of a low-intermediate frequency receiver, a storage medium and the receiver. The method comprises the steps of: selecting a local oscillator signal from a preset local oscillator frequency set to serve as an initial local oscillator signal, so as to carry out frequency mixing processing on an input signal to obtain a low-intermediate frequency signal, wherein the low-intermediate frequency signal comprises a low-intermediate frequency useful signal and a low-intermediate frequency interference signal; judging whether an energy ratio of the low-intermediate frequency interference signal to the low-intermediate frequency useful signal is greater than a first preset ratio; and if the energy ratio of the low-intermediate frequencyinterference signal to the low-intermediate frequency useful signal is greater than the first preset ratio, selecting another local oscillation signal from the preset local oscillation frequency set as a current local oscillation signal, and processing the input signal. In this way, the adjacent channel selectivity of the low-intermediate frequency receiver can be improved.

Description

technical field [0001] The present application relates to the field of communication technology, and in particular to a method for improving the performance of a low-IF receiver, a storage medium and a receiver. Background technique [0002] Due to the advantages of high integration, small size, low cost, low power consumption, and no need for image frequency rejection filters, the zero-IF solution is used by various companies to replace the superheterodyne solution, but the zero-IF solution is also There are defects, such as the need to remove DC or be very sensitive to signal I / Q imbalance, resulting in poor blocking performance. The blocking performance of the zero-IF scheme is about 19dB worse than that of the superheterodyne scheme, so it is extremely susceptible to interference from external signals. It is unacceptable in practical application. [0003] The inventors of the present application have found in long-term research and development that in order to solve the...

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Problems solved by technology

[0002] Due to the advantages of high integration, small size, low cost, low power consumption, and no need for image frequency rejection filters, the zero-IF solution is used by various companies to replace the superheterodyne solution, but the zero-IF solution is also There are defects, such as the need to remove DC or be very sensitive to signal I / Q imbalance, resulting in poor blocking performance. The blocking performance of the zero-IF scheme is about 19dB worse than that of the superheterodyne scheme, so it is extremely susceptible to interference from external signals. is unacceptable in practical applications

[0003] The inventors of the present application have found in long-term research and development that in order to solve the problems of the zero-IF scheme, a low-IF scheme can be used, so that the blocking performance can basically be close to that of the superheterodyne scheme, but the static low-IF scheme will make the upper adjacent channel or the lower The adjacent channel selectivity (ACS, Adjacent Channel Selectivity) index of the adjacent channel drops by about 24dB, which is also unacceptable, so using a static low-IF solution cannot solve all problems

[0004] In the prior art, the method to solve the problem of the decline of the adjacent channel selectivity index is to judge whether there is adjacent channel interference through the energy difference, and then judge whether to switch the low-IF local oscillator according to the magnitude of the adjacent channel interference, but it must be kept at all times The received channel bandwidth includes the signal and adjacent channel interference signals on both sides. Although the software backend has filtering processing, once the noise comes in from the hardware, the software filtering cannot achieve the effect of the hardware filtering, and the receiving sensitivity index will be affected; The method is to directly calculate the first interference and the second interference to judge the offset direction of the low-IF frequency local oscillator, but at the beginning, the local oscillator needs to switch back and forth at least two to three times to determine which side the low-IF frequency local oscillator falls on. Switch the local oscillator to update the saved interference data, if it is in a calling state, it will cause periodic bit errors

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