A weak communication signal detection method based on cyclostationary spectrum analysis
A cyclostationary and communication signal technology, which is applied in the field of weak communication signal detection of cyclostationary spectrum analysis, can solve the problems of poor communication conditions and inability to effectively complete signal detection in signal detection methods
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[0028] In a low signal-to-noise ratio environment, taking BPSK signal detection as an example, a method for detecting a weak communication signal based on cyclostationary spectrum analysis of the present invention is described and effectively evaluated.
[0029] Let the discrete BPSK signal be:
[0030]
[0031] where, s(t) is the bipolar baseband signal, f c is the carrier frequency, T s is the sampling interval, nT s is the total sampling time.
[0032]
[0033] Among them, g(t) is a rectangular pulse, T b is the symbol duration, a k is a random variable representing the amplitude of the kth symbol,
[0034] The autocorrelation function of BPSK signal is:
[0035]
[0036] According to the equation:
[0037]
[0038] Substituting formula (4) into simplification:
[0039]
[0040] Among them, R s (τ) represents the autocorrelation function of the baseband signal s(t). Let k=(m+n), from formula (5), we can see that R x (t,τ) is a periodic function t...
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