A method and device for suppressing adjacent channel interference based on inverse filtering
A technology of adjacent channel interference and inverse filtering, applied in the field of adjacent channel interference in wireless communication, can solve problems such as increasing receiver cost, reduce bandwidth requirements and be beneficial to engineering applications
Active Publication Date: 2021-03-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
However, in order to accurately describe the nonlinear characteristics of the interference signal, the auxiliary branch bandwidth should include all the nonlinear distortion of the interference signal, usually 3 to 5 times the channel bandwidth of the transmitter, corresponding to the sampling bandwidth of the required analog-to-digital converter (ADC) at least 6 to 10 times the channel bandwidth, and the wideband ADC will greatly increase the cost of the receiver
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[0065] The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.
[0066] like figure 1 As shown, a method for suppressing adjacent channel interference based on inverse filtering includes the following steps:
[0067] S1. Use a band-pass filter to filter out the out-of-band nonlinear component of the interference signal;
[0068] Wherein, the step S1 includes the following sub-steps:
[0069] S101. Use the receiver to receive the combined signal r(t) of the interference signal z(t) and the desired signal s(t) at different frequency points:
[0070] Let the working frequency of the jammer be ω 2 , the receiver operating frequency is ω 1 , the interfering transmitter channel and receiver channel are adjacent and have ω 2 1 , so the combined signal r(t) received at the receiver includes the interference signal z(t) and ...
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The invention discloses a method and device for suppressing adjacent channel interference based on inverse filtering, which comprises the following steps: S1. Using a band-limited filter to filter out the out-of-band nonlinear component of the interference signal; S2. The obtained band-limited signal After down-conversion, it is sent to a narrow-band ADC for sampling to obtain a baseband signal; S3. The band-limited baseband signal is recovered by inverse filtering to a full-bandwidth interference signal; S4. The restored signal is used to reconstruct and cancel adjacent channel interference. By building an auxiliary branch in the receiver, the present invention proposes an adjacent channel interference suppression method and device structure that uses time-domain inverse filtering technology to reconstruct the interference signal, and finally subtracts the reconstructed signal from the received signal. The bandwidth requirement of the sampling ADC is beneficial to the engineering application of the adjacent channel interference suppression method.
Description
technical field [0001] The present invention relates to adjacent channel interference in wireless communication, in particular to a method and device for suppressing adjacent channel interference based on inverse filtering. Background technique [0002] With the rapid development of wireless communication technology, wireless communication devices within a limited frequency spectrum are becoming more and more dense. When the transmitter is working, the spectrum expansion of the transmitted signal caused by the nonlinearity of the power amplifier will interfere with the received signal of the adjacent channel, resulting in a decrease in the received signal-to-noise ratio, and in severe cases, the receiver of the adjacent channel will be blocked, resulting in communication interruption. In order to solve this problem, the adjacent channel interference cancellation technology between wireless communication devices is also constantly being developed. [0003] Since the adjacent...
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IPC IPC(8): H04B1/10H04B1/16
CPCH04B1/10H04B1/1018H04B1/1027H04B1/16H04B2001/1045
Inventor 何怡敏霍晓磊赵宏志唐友喜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA