A pre-equalization based interference cancellation system and method
An interference cancellation and pre-equalization technology, applied in baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as spectrum unevenness, increased receiver processing complexity, and decreased accuracy, reducing channel Effects of multipath, reduced order, and improved accuracy
Active Publication Date: 2016-05-11
北京和宽科技有限公司
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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 ' the spectrum is not flat
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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[0020] The content of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the scope of the present invention is not limited in any way.
[0021] An embodiment of simultaneous duplexing at the same frequency in an OFDM system is as follows.
[0022] In the same-frequency simultaneous duplex system based on interference cancellation of broadband, the transceiver is transmitted on the same physical channel, and the interference caused by the transmitted signal on the receiving antenna needs to be eliminated in order to receive the target signal.
[0023] Such as figure 1 As shown, the present invention adds a pre-equalizer at the local transmitting end, and adds a pre-equalizing calculation module at the local receiving end.
[0024] At the receiving end, the received signal is divided into two paths by the splitter, one path is sent to the interference elimination adaptive filter as its input signal, an...
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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. The existing transceiver duplex systems are: frequency division duplex system and time division duplex system. 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 utilizatio...
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IPC IPC(8): H04L25/03H04L25/02
Inventor 焦秉立黄安鹏马猛肖如吾
Owner 北京和宽科技有限公司