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| Bit Soft-Output Algorithm for Dual N-ary Orthogonal Spread Spectrum System |
| Zhang Yu-ming; Cheng Yun-peng; Wei Sheng-qun; Shen Liang |
| Institute of Communications Engineering, PLAUST, Nanjing 210007, China |
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Abstract 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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Received: 25 August 2004
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2006, Vol. 28 
