Signal separation method of short burst mixed signal
A mixed-signal and signal-separation technology, applied in the field of satellite communications, to overcome frequency and phase differences, reduce computational complexity, and improve offset processing effects
Active Publication Date: 2020-07-24
NANJING UNIV OF POSTS & TELECOMM +1
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However, for special scenarios such as limited power and limited working hours, it is necessary to use short burst signals to work
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[0049] The present invention will be further described below in conjunction with the accompanying drawings.
[0050] like figure 1 Shown is a signal separation method for short-burst mixed signals, including the following steps:
[0051] Step 1. In the mixed signal separation stage, after down-conversion and analog-to-digital conversion, the receiving end can obtain the mixed signal r=[r 1 ,r 2 ,...,r n ,...,r N ] T and local reference signal s=[s 1 ,s 2 ,...s n ...,s N ] T , where n=1,2,...,N, N represents the number of sampling points, [·] T means transpose;
[0052] Step 2. Use the mixed signal r and the local reference signal s to perform demodulation preprocessing s'=r×s to obtain the preprocessed signal s'=[s' 1 ,s' 2 ,...,s′ n ,...,s′ N ] T ;
[0053] Step 3. Carry out low-pass filtering d=s'*h to the preprocessed signal s', and obtain the filtered signal d=[d 1 , d 2 ,...,d n ,...,d N ] T , wherein, h is the impulse response of the low-pass filter...
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The invention discloses a signal separation method of a short burst mixed signal. The method comprises steps of under the condition that the mixed signal and the local reference signal are obtained; performing corresponding preprocessing on the mixed signal; for preprocessed signals, obtaining the frequency and phase of a peak value by adopting a high-precision spectrum estimation algorithm, reconstructing a local reference signal by utilizing the obtained frequency and phase, respectively calculating a covariance matrix and a cross-correlation vector by utilizing the reconstructed local reference signal and the mixed signal, and carrying out adaptive weight calculation and cancellation processing so as to realize signal separation of the mixed signal; according to the technical scheme provided by the invention, the covering signal and the communication signal of the receiving end can be accurately separated, the operation complexity is reduced as much as possible, the signal separation method is effectively applied to the receiving end of satellite communication, and compared with the existing method, the signal separation method is simple to implement and more suitable for engineering practice.
Description
technical field [0001] The invention relates to the technical field of satellite communication, and mainly relates to a signal separation method of a short burst mixed signal. Background technique [0002] As an important means of modern communication, satellite communication has been widely used in the field of communication in developed countries. Among them, the ability to resist signal interception is the main consideration in system design. The initial design idea of anti-interception is to destroy the energy accumulation effect at the interception end as much as possible. Conventional methods include spreading, reducing the transmission rate, shortening the transmission time, using array antennas and beamforming methods. However, with the development of signal processing technology and the improvement of equipment indicators such as processing delay and instantaneous receiving bandwidth, the effect of conventional methods has gradually declined. In recent years, a...
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IPC IPC(8): H04L1/00H04L27/00H04L25/02
CPCH04L1/0045H04L1/0047H04L1/0052H04L27/0014H04L25/0202H04L2027/0026H04L2027/0024Y02D30/70
Inventor 刘子威曾敬张更新
Owner NANJING UNIV OF POSTS & TELECOMM