Performance enhancement of GMSK and LDPC based VLF communication in atmospheric radio noise

The performance of Gaussian minimum shift keying (GMSK) modulation scheme for very-low frequency (VLF) communication is evaluated experimentally in terms of the bit error rate. The atmospheric noise in this channel, which is predominantly non-Gaussian, is simulated using the clustering-Poisson model. A data-adaptive scheme is proposed for the suppression of the noise impulses for signal enhancement. The effects of channel coding and signal enhancement are presented, when the channel noise is modeled either as additive white Gaussian noise or as impulsive atmospheric radio noise. It is observed that the coding technique and the signal enhancement improve the performance of the communication system in the presence of the atmospheric radio noise, making it comparable with its performance in the presence of additive white Gaussian noise.

[1]  D. A. Chrissan,et al.  A comparison of low‐frequency radio noise amplitude probability distribution models , 2000 .

[2]  D.J.C. MacKay,et al.  Good error-correcting codes based on very sparse matrices , 1997, Proceedings of IEEE International Symposium on Information Theory.

[3]  Gonzalo R. Arce,et al.  Nonlinear Signal Processing - A Statistical Approach , 2004 .

[4]  Dong-U Lee,et al.  Pilotless Frame Synchronization for LDPC-Coded Transmission Systems , 2008, IEEE Transactions on Signal Processing.

[5]  G. R. Arce,et al.  A multichannel weighted median filter for complex array signal processing , 2005 .

[6]  Tung-Sang Ng,et al.  Symbol timing recovery for GMSK modulation based on squaring algorithm , 2001, IEEE Communications Letters.

[7]  Fridolin Heidler,et al.  Calculation of lightning current parameters , 1999 .

[8]  Martin Uman,et al.  A Review of Natural Lightning: Experimental Data and Modeling , 1982, IEEE Transactions on Electromagnetic Compatibility.

[9]  I. Miller.  Probability, Random Variables, and Stochastic Processes , 1966 .

[10]  Enrico Vassallo,et al.  Carrier phase synchronization for GMSK signals , 2002, Int. J. Satell. Commun. Netw..

[11]  Z. Flisowski,et al.  PARAMETERS OF LIGHTNING CURRENT GIVEN IN IEC 62305 – BACKGROUND , EXPERIENCE AND OUTLOOK , 2008 .

[12]  Sarah J. Johnson,et al.  Low‐Density Parity‐Check Codes: Design and Decoding , 2003 .

[13]  Robert G. Gallager,et al.  Low-density parity-check codes , 1962, IRE Trans. Inf. Theory.

[14]  T. Moon.  Error Correction Coding: Mathematical Methods and Algorithms , 2005 .

[15]  C. L. Nikias,et al.  Signal processing with fractional lower order moments: stable processes and their applications , 1993, Proc. IEEE.

[16]  Antony C. Fraser-Smith,et al.  A Clustering Poisson model for characterizing the interarrival times of sferics , 2003 .