Wireless laser communication PPM polarization modulation and demodulation method
A polarization modulation and demodulation method technology, applied in the field of communication, can solve the problems of short communication distance, low speed, easy to be affected by atmospheric random channels, etc., and achieve the effect of overcoming the influence and improving the code rate and transmission distance.
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[0019] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.
[0020] The existing pulse position modulation (PPM) method is to map a set of binary n-bit data groups to a single pulse signal at a certain time slot in a time period composed of 2n time slots. This modulation method is essentially It is a kind of phase modulation.
[0021] Record the n-bit data group as M=(m 1 , M 2 ,..., m n ), this mapping relationship can be expressed by the following formula:
[0022] Φ: L=m 1 +2m 2 +......+2 n-1 m n ∈(0, 1, 2,..., 2 n-1 ) In the formula, L represents the position number of the time slot.
[0023] which is:
[0024]
[0025] Where S n (t) represents the modulated signal, P C Represents pulse power, T C Represents the length of the time slot.
[0026] For example, for a 4-PPM:
[0027] If M = (0, 0), then L = 0; if M = (1, 0), then L = 1;
[0028] If M=(0,1), then L=2; if M=(1,1), then L=3;
[0029] 0, 1, 2, and 3 r...
PUM
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