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Volume 30 Issue 4
Dec.  2010
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Li Qiang, W H Mow, Li Shao-qian. A SNR Estimation Method in Turbo Detection System[J]. Journal of Electronics & Information Technology, 2008, 30(4): 836-839. doi: 10.3724/SP.J.1146.2006.01490
Citation: Li Qiang, W H Mow, Li Shao-qian. A SNR Estimation Method in Turbo Detection System[J]. Journal of Electronics & Information Technology, 2008, 30(4): 836-839. doi: 10.3724/SP.J.1146.2006.01490

A SNR Estimation Method in Turbo Detection System

doi: 10.3724/SP.J.1146.2006.01490
  • Received Date: 2006-09-30
  • Rev Recd Date: 2007-05-21
  • Publish Date: 2008-04-19
  • In this paper, the sensitivity of MAP algorithm and its reduced ones as Max-Log-MAP and Scaled Max-Log-Map to SNR mismatch in turbo detection systems are analyzed. Due to the fact of insensitivity of Scaled Max-Log-MAP algorithm to SNR mismatch, a new SNR estimation method is proposed using the soft output extrinsic information. Then, a new turbo equalization scheme is also provided utilizing the SNR estimation algorithm, and the corresponding performance of new equalization algorithm is also studied. The simulation results show that new equalization scheme with reliability-based SNR estimation method performs very close to MAP algorithm with known SNR, although it does not need pilot symbols.
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  • Bahl L, Cocke J, Jelinek F, and Raviv J. Optimal decoding oflinear codes for minimizing symbol error rate[J]. IEEETrans .on Infor. Theory, 1974, 20(2): 284-287.[2]Mohammad Ali Khalighi. Effect of mismatched SNR on theperformance of Log-Map turbo detector[J]. IEEE Trans. onVehicular Tech., 2003, 52(5) 1386-1397.[3]Worm A, Hoeher P, and When N. Turbo-decoding withoutSNR estimation[J]. IEEE Commun. Lett., 2000, 14(6):193-195.[4]Summers T A and Wilson S G. SNR mismatch and onlineestimation in turbo decoding[J].IEEE Trans. on Commun.1998, 46(4):421-423[5]Heo J. Analysis of scaling soft information on low densityparity check code[J].Electronics Letters.2003, 39(2):219-221[6]Chi Zhipei, Song Leilei, and Parhi K K. On theperformance/complexity tradeoff in block turbo decoderdesign[J].IEEE Trans. on Commun.2004, 52(2):173-175[7]Jun Heo and Chugg K M. Optimaization of scaling softinformation in iterative decoding via density evolution[J].IEEE Trans. on Commun.2005, 53(6):957-961[8]Chen Jinghu and Fossorier M P C. Near optimum universalbelief propagation based decoding of low-denisty parity checkcodes[J].IEEE Trans. on Commun.2002, 50(3):406-414[9]Pauluzzi D R and Beaulieu N C. A comparison of SNRestimation techniques for the AWGN channel[J].IEEE Trans.on Commun.2000, 48(10):1681-1691[10]Shahram Talakoub and Behnam Shahrrava. Turboequalization with iterative online SNR estimation[C]. IEEEWireless Communication and Network Conference, 13-17March, 2005, 2: 13-17.[11]Proakis J G. Digital Communications[M]. 4th edition, NewYork: McGraw Hill, 1998, chapter 10.
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