Radio frequency module passive inter-modulation (PIM) interference offset method and device

Abstract

The invention discloses a radio frequency module passive inter-modulation (PIM) interference offset method and device. The device comprises a digital intermediate frequency unit of a radio frequency module, the radio frequency module and an FDD base station system, a PIM component in the radio frequency module is eliminated to a certain extent, and the interference of the PIM on the receiving performance of the radio frequency module is reduced. According to some feasible execution modes, the digital intermediate frequency unit of the radio frequency module comprises an obtaining subunit, a computing subunit and a superposition subunit, wherein the obtaining subunit is used for obtaining digital emitting signals from an emitting channel of the radio frequency module, the computing subunit is used for carrying out nonlinear transformation on the digital emitting signals and generating offset signals for offsetting the PIM component, and the superposition subunit is used for reversely superposing the offset signals to the receiving channel of the radio frequency module so as to offset the PIM component of the received signals.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a passive intermodulation PIM interference canceling method and a related device of a radio frequency module. Background technique [0002] In a wireless communication system, as voice and data information need to pass within a fixed bandwidth increases day by day, Passive Inter-Modulation (PIM) becomes an important factor limiting system capacity. Passive intermodulation in wireless communication systems is caused by the non-linear characteristics of various passive components (such as duplexers, antennas, feeders, radio frequency connectors, etc.) in the transmission system. In a high-power, multi-channel system, due to the high-power characteristics, the traditional passive linear device produces a strong nonlinear effect, thereby generating a set of new frequencies such as (PIM3, PIM5...), or generating spurious Signal-passive intermodulation, if these spurious PIM si...

AI Technical Summary

Problems solved by technology

The PIM level of RF passive components is related to the manufacturing process, material and structural design, and installation method, it is difficult to control regularly, and a good PIM level, there is a timeliness problem, passive components (such as duplexers, antennas) After leaving the factory, due to the slight deformation of its internal structure, thermal expansion and contraction, surface air oxidation and other factors, the PIM index will gradually deteriorate

Therefore, it is difficult to solve the PIM interference reception problem of passive devices engineeringly under the condition of limited cost by improving the manufacturing process and standardizing the installation methods.

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