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Volume 28 Issue 3
Sep.  2010
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Zhang Yu-ming, Cheng Yun-peng, Wei Sheng-qun, Shen Liang. Bit Soft-Output Algorithm for Dual N-ary Orthogonal Spread Spectrum System[J]. Journal of Electronics & Information Technology, 2006, 28(3): 455-460.
Citation: Zhang Yu-ming, Cheng Yun-peng, Wei Sheng-qun, Shen Liang. Bit Soft-Output Algorithm for Dual N-ary Orthogonal Spread Spectrum System[J]. Journal of Electronics & Information Technology, 2006, 28(3): 455-460.

Bit Soft-Output Algorithm for Dual N-ary Orthogonal Spread Spectrum System

  • Received Date: 2004-08-25
  • Rev Recd Date: 2004-12-13
  • Publish Date: 2006-03-19
  • Focusing on Turbo-coded dual N-ary orthogonal spread spectrum system, this paper proposes an algorithm for computing bit soft metric based on Maximum a Posteriori Probability (MAP) criterion, and then presents a simplified MAP algorithm. Meanwhile, the fixed-point and float-point performances are simulated and compared with several existing algorithms. It is shown that MAP algorithm greatly improves the whole system performance; the simplified MAP algorithm with L=3 outperforms the dual-maxima algorithms 0.4dB without extra cost in complexity..
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