Linear and widely linear filtering applied to iterative detection of generalized MIMO signals

2005 ◽  
Vol 60 (1-2) ◽  
pp. 147-168
Author(s):  
Melanie Witzke
Keyword(s):  
Iterative Detection ◽  
Linear Filtering ◽  
Widely Linear

scholarly journals Widely Linear Filtering for Multi-Impairment Compensation in Coherent Optical Systems

2021 ◽  
Author(s):  
Rekha Yadav ◽  
Lakshmi Narayanan Venkatasubramani ◽  
Ravinder David Koilpillai ◽  
Deepa Venkitesh
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
Digital Processing ◽  
Optical Systems ◽  
Linear Filtering ◽  
Carrier Recovery ◽  
Iq Imbalance ◽  
Optical Communication Systems ◽  
Equalization Algorithm ◽  
Widely Linear

We propose a blind joint equalization algorithm for M-QAM signals based on a widely linear filtering approach. The proposed scheme jointly compensates receiver IQ imbalance and polarization mixing, along with carrier recovery, followed by transmitter IQ imbalance compensation. We first investigate the proposed scheme's tolerance to transceiver IQ Imbalance, polarization mixing, phase noise and frequency offset through numerical simulations for 32 GBd PM-16QAM and PM-64QAM signals and compare its performance with the conventional digital processing algorithms. Further, with the proposed algorithm, we experimentally demonstrate the improvement in Q<sup>2</sup> value to up to ~ 1.22 dB for a 32 GBd PM-16QAM and ~ 3.72 dB for a 16 GBd PM-64QAM signal with a phase imbalance of 9<sup>o</sup>. We show that the MSE convergence of the proposed joint equalizer is much faster than conventional DSP algorithms. Deployment of such an equalizer in optical communication systems is beneficial due to its improved tolerance to multiple impairments, albeit with increased complexity.

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