Interference elimination system and method based on pre-equalization

Abstract

The invention relates to an interference elimination system and method based on pre-equalization and belongs to the field of communication and signal processing. At a receiving end, a received signal is divided into two paths, one path signal is sent to an interference elimination self-adapting filter and serves as an input signal of the interference elimination self-adapting filter, the other path signal is sent to a pre-equalization computing module, weight is computed by the pre-equalization computing module according to the received signal or a channel estimated value, and the computed weight is enabled to be sent to a pre-equalizer of an interference emission end. At the interference emission end, an emission signal is divided into two paths, one path signal serves as a referential signal and is sent to the interference elimination self-adapting filter at the receiving end, the other path signal is sent to the pre-equalizer, and pre-equalization processing is carried out on the emission signal by the pre-equalizer and then the emission signal is sent out. Compared with a traditional interference elimination method, the interference elimination method is capable of simplifying work of the interference elimination self-adapting filter and effectively eliminating broadband self-interference signals.

Description

technical field [0001] The invention relates to the field of communication and signal processing, in particular to a self-interference elimination system and method based on pre-equalization. Background technique [0002] In communication, the research and development of high-efficiency duplex methods has always been emphasized. Existing transceiver duplex systems include frequency division duplex systems and time division duplex systems. Among them, the frequency division duplex system uses different frequencies to isolate the interference between the transceiver links. Although the TDD system uses the same frequency for data transmission on the transceiver link, it uses different time slots to isolate the interference between the transceiver links. The transmission and reception of the above two duplex methods either occupy frequency resources or time resources respectively. Therefore, their spectral efficiencies are the same. In order to improve the spectrum utilizati...

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Problems solved by technology

[0008] However, for wideband signals, S TX1 ′ may be affected by frequency-selective fading channels, resulting in S TX1 ′ has an uneven frequency spectrum

In order to restore the interference signal, the receiver interference canceller needs to use a multi-order filter to simulate the channel effect; as the filter order increases, the receiver processing complexity also increases and the accuracy decreases

It is especially important that when the signal is affected by the frequency selective fading channel, it is difficult for the receiver to effectively eliminate interference at the radio frequency, because it is difficult to adaptively filter the signal on the analog radio frequency

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