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Volume 30 Issue 9
Jan.  2011
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Nie Yuan-Fei, Ge Jian-Hua, Wang Yong. Iterative SNR Estimation Algorithm for M-APSK Signal Based on A Priori Information[J]. Journal of Electronics & Information Technology, 2008, 30(9): 2170-2173. doi: 10.3724/SP.J.1146.2007.00327
Citation: Nie Yuan-Fei, Ge Jian-Hua, Wang Yong. Iterative SNR Estimation Algorithm for M-APSK Signal Based on A Priori Information[J]. Journal of Electronics & Information Technology, 2008, 30(9): 2170-2173. doi: 10.3724/SP.J.1146.2007.00327

Iterative SNR Estimation Algorithm for M-APSK Signal Based on A Priori Information

doi: 10.3724/SP.J.1146.2007.00327
  • Received Date: 2007-03-07
  • Rev Recd Date: 2007-09-24
  • Publish Date: 2008-09-19
  • This paper proposes an iterative Signal-to-Noise Ratio (SNR) estimation algorithm suited to Multiple Amplitude Phase Shift Keying (M-APSK) signal based on a priori information. Given a priori, the M-PASK signal has the determinate probability distribution with flat-fading, and its logarithmic expection is differentiated to yield the relation between the SNR parameters and the data. Reliability metric is introduced to updata the parameters, then the iterative algorithm is put forward correspondingly. Compared with the foregone Memont Methods (MM), simulation results show that the new algorithm using a prior has better performance when the intrinsic information is larger than 0.4 with 4 iterations, while that without a prior only better in middle and hign SNR with 5 iterations used.
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