| 多频带UWB通信系统中低复杂度迭代差分译码算法 |
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| 引用本文： | 金秀峰,毕光国,肖海勇.多频带UWB通信系统中低复杂度迭代差分译码算法[J].东南大学学报,2007,23(1):7-11. |
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| 作者姓名： | 金秀峰 毕光国 肖海勇 |
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| 作者单位： | 东南大学移动通信国家重点实验室 南京210096 |
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| 基金项目： | The Higher Education Technology Foundation of Huawei Technologies Co., Ltd. （No. YJCB2005016WL）. |
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| 摘 要： | 相对于相干检测,由于在收发端不需要信道状态信息,非相干UWB通信在信噪比方面会有近3dB的性能损失.为了克服这一性能差距,提出了一种有效的基于多频带UWB系统的差分编译码方案.该方案在发射端使用2个并行级联的递归酉差分空频编码器对数据进行编码.接收端的2个分量译码器通过互相交换软度量值对数据进行译码.为了降低接收机的计算复杂度,给出一种只使用转移概率计算信息比特似然比的译码算法.仿真结果表明,在较少迭代次数下,算法性能远优于传统非相干检测,在高信噪比时,其性能甚至超过了相干检测.
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| 关 键 词： | 多频带UWB 多输入多输出(MIMO)系统 非相干检测 群码 迭代译码 |
| 文章编号： | 24268008 |
| 修稿时间： | 2006-08-31 |
Low complexity iterative differential decoding algorithm for multiband UWB communication systems |
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| Jin Xiufeng,Bi Guangguo,Xiao Haiyong.Low complexity iterative differential decoding algorithm for multiband UWB communication systems[J].Journal of Southeast University(English Edition),2007,23(1):7-11. |
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| Authors: | Jin Xiufeng Bi Guangguo Xiao Haiyong |
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| Institution: | National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China |
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| Abstract: | Due to not requiring channel state information (CSI) at both the transmitter and the receiver,noncoherent ultra-wideband (UWB) incurs a performance penalty of approximately 3 dB in the required signal to noise ratio (SNR) compared to the coherent case.To overcome the gap,an effective differential encoding and decoding scheme for multiband UWB systems is proposed.The proposed scheme employs the parallel concatenation of two recursive differential unitary space-frequency encoders at the transmitter.At the receiver,two component decoders iteratively decode information bits by interchanging soft metric values between each other.To reduce the computation complexity,a decoding algorithm which only uses transition probability to calculate the log likelihood ratios (LLRs) for the decoded bits is given.Simulation results show that the proposed scheme can dramatically outperform the conventional differential and even coherent detection at high SNR with a few iterations. |
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| Keywords: | multiband UWB multiple-input multiple-output (MIMO) system noncoherent detection group code iterative decoding |
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