LMS (least mean square) method for updating coefficient of self-adaptive equalizer without frequency difference and phase difference feedback
An adaptive equalization and coefficient update technology, applied in the field of coherent optical communication, can solve problems such as failure to work correctly, no frequency difference and phase difference feedback, failure to guarantee system survival, etc. sexual effect
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[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0046] see figure 2 As shown, the embodiment of the present invention provides an LMS method for updating adaptive equalizer coefficients without frequency difference and phase difference feedback, including the following steps:
[0047] Step S1: The X-polarized received signal of the adaptive equalizer [Ein x ] and Y-polarized received signal [Ein y ] for time domain equalization, the formula for time domain equalization is:
[0048]
[0049]
[0050] in, with are the outputs of the adaptive equalizer X polarization signal and Y polarization signal respectively, F xx , F xy , F yx , F yy are the four adaptive equalizer coefficients, n is the sequence number, L is the series number of the adaptive equalizer, and l is the series number of the adaptive equalizer, go to step S2.
[0051] Step S2: Define the error formul...
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