Multi-system same-frequency interference cancellation method
A co-frequency interference and multi-standard technology, applied in the direction of communication interference, electrical components, etc.
Active Publication Date: 2020-08-25
成都云溯新起点科技有限公司
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The key points include: 1. A multi-state adaptive interference cancellation method is proposed, which is universal for different interference patterns; 2. Differential correlation and phase-locked loop tracking technology are adopted to solve the problem of large frequency deviation of actual signals. Frequency tracking problem; 3. A high-efficiency detection technology is added for burst interference, and the work of the adaptive filter is guided by the detection result. When there is no interference, the canceller does not work, ensuring the rapid convergence of burst interference cancellation; 4. Proposed Synchronization and channel parameter fitting technology for burst interference, realizing high-precision initial estimation of burst interference parameters
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[0078] A method for canceling multi-standard co-channel interference, comprising the following steps:
[0079] S1: Interference detection step, detecting the presence or absence of interference signals, which can adapt to both continuous signals and burst signals, using the sliding double window method for interference detection, judging the presence or absence of interference, and recording the occurrence of interference in the case of interference start position and end position;
[0080] S2: The parameter initial estimation step. After the interference is detected in step S1, the interference parameters are initially estimated. The parameters include the time delay, frequency offset, and amplitude and phase of channel transmission. The estimated parameters are used to complete the two-way signal alignment and frequency Offset correction;
[0081] S3: The step of multi-state adaptive interference cancellation. On the basis of step S2, the result of amplitude and phase estim...
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The invention discloses a multi-system same-frequency interference cancellation method, which comprises the following steps of: detecting whether interference signals exist or not, adapting to continuous signals and burst signals, detecting interference by adopting a sliding double-window method, judging whether the interference exists or not, and recording a starting position and an ending position of the interference under the condition that the interference exists; performing initial estimation on interference parameters, wherein the parameters comprise time delay, frequency offset and amplitude phase of channel transmission, and alignment of the two paths of signals and correction of the frequency offset are completed by utilizing the estimated parameters; and taking an amplitude-phaseestimation result as an initial value of an adaptive filter, and realizing interference cancellation by adopting a polymorphic LMS tracking loop algorithm. The method supports various interference modes, including various modulation signals, single tones, noise frequency modulation and the like, and can be applied to various interference scenes; and the method has universality for different interference patterns.
Description
technical field [0001] The invention belongs to the technical field of military communication anti-jamming and communication countermeasures, and in particular relates to a multi-system same-frequency interference canceling method. Background technique [0002] In the prior art, in the field of military communication anti-jamming and communication countermeasures, it solves the problem of eliminating intentional or unintentional interference of the same frequency encountered in one's own communication. The problem of same-frequency interference exists widely in communication, such as the coupling interference problem of transmitted signals in a simultaneous and same-frequency full-duplex communication system, the mutual interference problem between multiple transceivers on the same communication platform, and the problem of self-launched signals in communication countermeasures. The elimination of interference signals, etc., domestic and foreign research institutions and maj...
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IPC IPC(8): H04K3/00
CPCH04K3/22H04K3/80H04K3/827
Inventor 贺荣华涂世龙万坚李翔
Owner 成都云溯新起点科技有限公司