PN code FFT parallel acquisition method based on majority decision
A decision and large number technology, applied in the field of PN code FFT parallel acquisition and decision, can solve the problems of high channel noise sensitivity, single synchronization acquisition decision criteria, synchronization acquisition, etc., to achieve the effect of improving robustness
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[0047] The FFT parallel pseudo-code acquisition method of this embodiment is performed under the condition that the receiver has extracted the transmitter carrier frequency fc, where:
[0048] The number of cascade stages of short pseudo codes: G=4 (4 same short pseudo codes);
[0049] The short pseudo code spreading factor is: l=256 (M sequence);
[0050] Short pseudo code generator polynomial: [8 4 3 2 0], initial state: -1;
[0051] Baseband modulation mode: two-phase phase shift keying (BPSK) modulation (carrier frequency is f c =10MHz);
[0052] Wireless channel environment: Rayleigh channel;
[0053] Channel SNR range: [-20:10]dB;
[0054] Capture technology: FFT parallel pseudo code capture;
[0055] Large number judgment threshold: g=3;
[0056] The specific method is as follows:
[0057] Transmitter A
[0058] Step A-1. Short pseudo-code set generation: The transmitter converts the long pseudo-code (long M sequence) with a spreading factor of 1024 in the background technology into a ...
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