针对3G移动通信中的某些特殊应用场景,如信号侦查、定位及信号的智能干扰等需要对通信信道进行快速准确估计的要求,在B.Steiner信道估计法的基础上,提出一种新型的改进方法。该方法首先对B.Steiner信道估计结果进行门限处理,然后对保留...针对3G移动通信中的某些特殊应用场景,如信号侦查、定位及信号的智能干扰等需要对通信信道进行快速准确估计的要求,在B.Steiner信道估计法的基础上,提出一种新型的改进方法。该方法首先对B.Steiner信道估计结果进行门限处理,然后对保留径的响应进行最大比增益修正,从而进一步减弱噪声对系统的影响。在TD-SCDMA的协议测试模型case3条件下进行仿真,结果表明,在不明显增加算法复杂度的前提下,同一误码率时该方法所需输入信噪比降低了1~2 d B。展开更多
On the basis of analyzing the principle of multicarrier code division multiple access (MC-CDMA), an optimized complex wavelet packet based MC-CDMA system (CWP-MC-CDMA) is proposed. The system performances with equal g...On the basis of analyzing the principle of multicarrier code division multiple access (MC-CDMA), an optimized complex wavelet packet based MC-CDMA system (CWP-MC-CDMA) is proposed. The system performances with equal gain combining (EGC) technique and maximum ratio combining (MRC) technique in Nakagami-m fading channels are investigated, respectively; and the corresponding bit error rate (BER) expression is derived. The system can overcome the decrease of spectrum efficiency of discrete Fourier transform (DFT) based conventional MC-CDMA (DFT-MC-CDMA) due to inserting a cyclic prefix (CP). Theoretical analysis and simulation results show that the CWP-MC-CDMA system outperforms DFT-MC-CDMA as well as the real wavelet packet based MC-CDMA (RWP-MC-CDMA) system, and has superior ability to combat multi-path fading and multi-access interference (MAI). Moreover, the BER performance of the proposed system is also superior to that of the conventional MC-CDMA with CP.展开更多
文摘针对3G移动通信中的某些特殊应用场景,如信号侦查、定位及信号的智能干扰等需要对通信信道进行快速准确估计的要求,在B.Steiner信道估计法的基础上,提出一种新型的改进方法。该方法首先对B.Steiner信道估计结果进行门限处理,然后对保留径的响应进行最大比增益修正,从而进一步减弱噪声对系统的影响。在TD-SCDMA的协议测试模型case3条件下进行仿真,结果表明,在不明显增加算法复杂度的前提下,同一误码率时该方法所需输入信噪比降低了1~2 d B。
文摘On the basis of analyzing the principle of multicarrier code division multiple access (MC-CDMA), an optimized complex wavelet packet based MC-CDMA system (CWP-MC-CDMA) is proposed. The system performances with equal gain combining (EGC) technique and maximum ratio combining (MRC) technique in Nakagami-m fading channels are investigated, respectively; and the corresponding bit error rate (BER) expression is derived. The system can overcome the decrease of spectrum efficiency of discrete Fourier transform (DFT) based conventional MC-CDMA (DFT-MC-CDMA) due to inserting a cyclic prefix (CP). Theoretical analysis and simulation results show that the CWP-MC-CDMA system outperforms DFT-MC-CDMA as well as the real wavelet packet based MC-CDMA (RWP-MC-CDMA) system, and has superior ability to combat multi-path fading and multi-access interference (MAI). Moreover, the BER performance of the proposed system is also superior to that of the conventional MC-CDMA with CP.
