Performance of super-orthogonal convolutional coding for ultra-wideband systems in multipath and multiuser channels
Performance of super-orthogonal convolutional coding for ultra-wideband systems in multipath and multiuser channels
复制标题
DOI：
10.1007/s11277-006-9196-5
复制
发表时间：
2007-02-01
影响因子：
2.2
通讯作者：
Kohno, Ryuji
中科院分区：
文献类型：
--
作者：
Matsumoto, Tomoko;Kohno, Ryuji
本文研究了在码间干扰（ISI）和多用户干扰（MUI）的实际环境下，超正交卷积码（SOCC）在基于直接序列的超宽带（DS-UWB）系统中的应用。分别采用最大比合并（MRC）RAKE接收机和最小均方误差（MMSE）RAKE接收机以及匹配滤波接收机，分析了多用户干扰（MUI）和码间干扰（ISI）对SOCC性能的影响。分析表明，在采用简单的MRC-RAKE接收机的情况下，由于扩频序列长度较短，SOCC的性能受到MUI和ISI的影响。为了对抗多用户干扰和码间干扰，本文提出了一种结合自组织正交码的跳码方案。结果表明，在多径和多址信道下，SOCC方案优于较高速率的传统卷积编码方案。此外，使用MMSE-RAKE接收机来抑制干扰进行了分析，并观察到随后的系统容量的增加。
This paper investigates the application of super-orthogonal convolutional codes (SOCC) to a direct-sequence based ultra- wideband (DS-UWB) system under a realistic environment including inter-symbol interference (ISI) and multiuser interference (MUI). The effect of MUI and ISI on the performance of SOCC is analyzed by using both maximum ratio combining (MRC) RAKE receiver and minimum mean-squared error (MMSE) RAKE receiver followed by matched filter receiver. The analysis shows that in the case of employing simple MRC-RAKE receiver, the performance of SOCC is ffected by MUI and ISI because of the short length of the spreading sequence. In order to combat MUI and ISI, a code-hopping scheme is proposed in conjunction with SOCC. The results show that SOCC scheme outperforms the higher-rate conventional convolutional coded scheme for multipath and multiple access channels. Furthermore, the use of MMSE-RAKE receiver to suppress interference is analyzed and the subsequent increase of the system capacity is observed.