...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of communication systems >Performance of optimum wavelet waveform for DS-CDMA chip waveform over QS-AWGN channel
【24h】

Performance of optimum wavelet waveform for DS-CDMA chip waveform over QS-AWGN channel

机译：QS-AWGN通道上DS-CDMA芯片波形的最佳小波波形性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, we search for a better chip waveform based on orthogonal wavelets for direct sequence-code division multiple access (DS-CDMA) signals to improve the probability of error (P_e) performance with minimal signal bandwidth variations. First, we derive the P_e expression over a quasi-synchronous additive white Gaussian noise channel for DS-CDMA signals, which use various pulse shaping waveforms including orthogonal wavelets as chip waveforms. It is observed that this expression depends on the chip waveform. Then, we design an optimum wavelet by using the relationship between wavelets and filter coefficients to reduce the probability of error. The DS-CDMA system using the optimum wavelet waveform results in a lower probability of error than those using the conventional chip waveforms such as raised cosine, half-sine and rectangular waveforms. Especially, the P_e of the optimum wavelet-based scheme becomes significantly better than those of the conventional chip waveforms-based schemes under the heavy loading that is the case for commercial wireless systems. When the systems work with full load (i.e. the number of users equals the processing gain), the optimum wavelet-based system results in 0.5, 2.1 and 4dB better SNR values than those of the raised cosine, half-sine and rectangular-based systems, respectively, for a P_e value of 10~(-3).
机译：在本文中，我们基于正交小波为直接序列码分多址（DS-CDMA）信号寻找更好的芯片波形，以最小的信号带宽变化来提高错误概率（P_e）性能。首先，我们在用于DS-CDMA信号的准同步加性高斯白噪声信道上推导P_e表达式，该信道使用各种脉冲整形波形，包括正交小波作为芯片波形。观察到该表达式取决于芯片波形。然后，我们通过利用小波和滤波器系数之间的关系来设计最优小波，以减少误差的可能性。与使用诸如升余弦，半正弦和矩形波形之类的常规芯片波形的DS-CDMA系统相比，使用最佳小波波形的DS-CDMA系统产生错误的可能性更低。特别地，在商用无线系统的重负载下，基于最优小波的方案的P_e明显优于传统基于小波波形的方案的P_e。当系统在满负载下工作时（即，用户数量等于处理增益），与基于余弦，半正弦和基于矩形的系统相比，基于小波的最佳系统的SNR值分别提高0.5、2.1和4dB P_e值分别为10〜（-3）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号