Optical communication MIMO detection method and system
A detection method and optical communication technology, applied in the field of optical communication, can solve problems such as small number of mode inputs and outputs, complex algorithms, difficult implementation, etc., to achieve the effects of avoiding time, good detection effect, and improving structural efficiency
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Embodiment 1
[0041] A kind of optical communication MIMO detection method, described detection method comprises the following steps:
[0042] S1: Obtain the input signal d(t) at the sending end of the optical communication system, the channel matrix H, and the port output R at the receiving end x (t)=[r x1 (t), r x2 (t),...,r xN (t)] T ∈C N ;
[0043]S2: Construct a fully connected deep neural network with M layers, the structure of the fully connected deep neural network is as follows figure 2 As shown, expressed as a mapping function f(x 0 ;θ): R D0 →R DM , after M iterations the input vector x 0 ∈ R D0 transform to output vector x M ∈ R DM , where x 0 =[Re(r x1 (t)), Im(r x1 (t)), Re(r x2 (t)), Im(r x2 (t)),..., Re(r xN (t)), Im(r xN (t))], the iterative process is defined as:
[0044] x m = f m (x m-1 ; θ m )
[0045] Where: x m = f m (x m-1 ; θ m ) means R Dm-1 →R Dm is the mapping function of the Mth layer, θ m is the parameter of the neural network, ...
Embodiment 2
[0094] Such as Figure 4 As shown, an optical communication MIMO system includes a transmitting end, a receiving end, and a multimode optical fiber connecting the transmitting end and the receiving end,
[0095] The sender includes
[0096] A subcarrier multiplexing module with N quadrature phase shift keying modulators (Quadrature Phase Shift Keying, QPSK), the subcarrier multiplexing module is used to receive input signals, and the quadrature phase shift keying The load wave frequency of the modulator is set to f c .
[0097] TX with Mach-Zehnder Modulator (MZM) and Optical Carrier Amplifier i The module is used to control the Mach-Zehnder optical modulator through the modulation symbol of the quadrature phase shift keying modulator, so as to realize the adjustment of the intensity of the optical signal;
[0098] assuming d in is the nth input bit of the ith channel. The output of the i-th QPSK modulator is:
[0099]
[0100] Where: f c is the load wave frequency,...
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