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| Combined Iterative Algorithm for Multilevel Coded UWB Communications Systems |
| Deng Shuang-cheng①; Xie Jin-jun②; Bai Bao-ming①; Wang Xin-mei① |
| ①State Key Laboratory of ISN, Xidian University, Xi’an 710071, China;②College of Information Science and Engineering, Nanjing University of Technology, Nanjing 210009, China |
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Abstract In this paper, a multilevel coded ultra wideband system with combined iterative pulses demapping and decoding algorithm is proposed. The simulation result of three level coded ultra wideband systems show that the bit error performance has been improved prominently compared with uncoded situation. Iterative multistage algorithm and iterative parallel algorithm can achieve optimal performance through three and four iterations respectively in AWGN channel, but in indoor multipath channels, two and three iterations are enough to get the optimal performance respectively. Compared to iterative multistage algorithm, iterative parallel algorithm achieves equivalent performance under optimal iteration and requires only about 1/3 time delay than latter.
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Received: 11 December 2006
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2008, Vol. 30 
