Research On PNC And LDPC Based On MIMO Technology

Multiple-input multiple-output technology,physical layer network coding,and low-density parity-check codes are hot technologies of wireless communication in recent years and have been widely used in military,aviation,environmental monitoring,intelligent communications,intelligent transportation,and telemedicine.field.The current research mainly focuses on additive Gaussian white noise or Rayleigh fading channel conditions without considering bursts.This thesis mainly discusses the error performance of low-density parity-check codes under burst conditions,and improves the decoding algorithm of low-density parity-check codes after it is combined with the aforementioned physical-layer network coding and multiple-input multiples.Joint research is conducted on output technologies and the main tasks are as follows:1.Analyze the theoretical error performance without channel coding under burst conditions.Under the condition of three different bursts,Reed-solomon codes and low-density parity-check code are respectively tried to reduce the impact of burst,and the simulation analysis is performed.The simulation results show that after channel coding,the impact of burst error performance can be greatly improved.2.For the problem that the complexity of NLBP and OLBP decoding algorithms is too high,the NLBP decoding algorithm and the OLBP decoding algorithm are improved,and the improved decoding algorithm is obtained.The simulation compares and analyzes the improvement before and after the improvement.Decoding algorithm performance,including the level of calculations,iterations and BER performance.It is found that the improved decoding algorithm simplifies the decoding complexity and is more suitable for actual transmission in the case of no significant change in error performance.3.Combine multiple input and multiple output techniques,physical layer network coding,and low-density parity-check code for the joint coding scheme simulation,and use the improved NLBP decoding algorithm.The result shows that the scheme is more suitable for achieving good BER performance in the fading channel than the MIMO technology and the low-density parity-check codes joint scheme.