Due to the influence of scatterers around the receiving antenna, the multipath signal in satellite mobile communication systems is correlated with each other which would influence the system performance. There is no s...Due to the influence of scatterers around the receiving antenna, the multipath signal in satellite mobile communication systems is correlated with each other which would influence the system performance. There is no systematic standard on the channel modelling of the wideband satellite channel at present, so the study of the modelling of the wideband satellite channel is of great importance. In this paper, firstly we created a multi-beam model which can figure out the antenna gain of the nth component beam. Secondly, we combined the characteristics of multi-beam satellite channel and the distribution of the scatterers, and set up a three-dimension random channel model. This model is more realistic for satellite communication system since it considers the height of scatterers. According to the channel models, we had the formula of spatial correlation coefficient. We used the formula to calculate the relationship between spatial correlation coefficient and the interval of antennas. The result shows that the spatial correlation exists and cannot be ignored while modeling for mobile satellite system.展开更多
该文提出一种多输入多输出(multi-input multi-output,MIMO)宽带电力线载波通信(power line communications,PLC)信道混合模型。该模型结合电力线载波通信信道自上而下和自下而上两种建模方法,考虑了多输入多输出载波信道的空间相关性,...该文提出一种多输入多输出(multi-input multi-output,MIMO)宽带电力线载波通信(power line communications,PLC)信道混合模型。该模型结合电力线载波通信信道自上而下和自下而上两种建模方法,考虑了多输入多输出载波信道的空间相关性,提供一种不需要完整载波网络拓扑信息和测量数据的先验电力线信道建模方法。给出了低压室内电力线载波通信信道模型算例,分析了算例在2~30MHz和2~100MHz两种带宽下的信道特征和参数,并与已有模型进行了对比。结果表明,在同等条件下该文模型与已有模型仿真结果一致,但克服了需要获得大量负载阻抗信息或大量测量数据建模的困难,为多输入多输出电力线载波通信提供了一种具有实用价值的仿真分析方法,对于简化多输入多输出电力线载波信道的研究、设计和工程应用具有重要意义。展开更多
A multiple-input multiple-output interleave division multiple access (MIMO-IDMA) system with Triple Polarized Division Multiplexing (TPDM) is presented in this paper. The present methodology replaces three indepe...A multiple-input multiple-output interleave division multiple access (MIMO-IDMA) system with Triple Polarized Division Multiplexing (TPDM) is presented in this paper. The present methodology replaces three independent linearly polarized antennas with a single triple polarized antenna at both the transmitter and receiver. The users in the communication link are accommodated and separated using a user-specific interleaver combined with low rate spreading sequence. To eliminate the effects of multi-stream interference (MSI), minimum mean square error (MMSE) algorithm based on successive interference cancellation (SIC) Multi-user detection (MUD) technique is employed at the receiver. Furthermore, log-maximum a posteriori probability (MAPP) decoding algorithm is implemented at the mobile stations (MSs) to overcome the effects of multi-user interference (MUI) effects. The paper also evaluates the effects of coded MIMO-IDMA in the downlink communication by adopting the Stanford University Interim (SUI) and Long-term Evolution (LTE)channel model specifications. In comparison with the traditional uncoded system, the present solution considering turbo coded triple-polarized MIMO-IDMA system with iterative decoding algorithm provides better bit error rate (BER) with reduced signal to noise ratio (SNR). The simulation results also show that though the SNR requirement is higher for the proposed technique compared to the conventional uni-polarized antenna based MIMO-IDMA system, it gives the advantages of achieving higher data rate with reduced cost and space requirements in the context of a downlink (DL).展开更多
文摘Due to the influence of scatterers around the receiving antenna, the multipath signal in satellite mobile communication systems is correlated with each other which would influence the system performance. There is no systematic standard on the channel modelling of the wideband satellite channel at present, so the study of the modelling of the wideband satellite channel is of great importance. In this paper, firstly we created a multi-beam model which can figure out the antenna gain of the nth component beam. Secondly, we combined the characteristics of multi-beam satellite channel and the distribution of the scatterers, and set up a three-dimension random channel model. This model is more realistic for satellite communication system since it considers the height of scatterers. According to the channel models, we had the formula of spatial correlation coefficient. We used the formula to calculate the relationship between spatial correlation coefficient and the interval of antennas. The result shows that the spatial correlation exists and cannot be ignored while modeling for mobile satellite system.
文摘该文提出一种多输入多输出(multi-input multi-output,MIMO)宽带电力线载波通信(power line communications,PLC)信道混合模型。该模型结合电力线载波通信信道自上而下和自下而上两种建模方法,考虑了多输入多输出载波信道的空间相关性,提供一种不需要完整载波网络拓扑信息和测量数据的先验电力线信道建模方法。给出了低压室内电力线载波通信信道模型算例,分析了算例在2~30MHz和2~100MHz两种带宽下的信道特征和参数,并与已有模型进行了对比。结果表明,在同等条件下该文模型与已有模型仿真结果一致,但克服了需要获得大量负载阻抗信息或大量测量数据建模的困难,为多输入多输出电力线载波通信提供了一种具有实用价值的仿真分析方法,对于简化多输入多输出电力线载波信道的研究、设计和工程应用具有重要意义。
文摘A multiple-input multiple-output interleave division multiple access (MIMO-IDMA) system with Triple Polarized Division Multiplexing (TPDM) is presented in this paper. The present methodology replaces three independent linearly polarized antennas with a single triple polarized antenna at both the transmitter and receiver. The users in the communication link are accommodated and separated using a user-specific interleaver combined with low rate spreading sequence. To eliminate the effects of multi-stream interference (MSI), minimum mean square error (MMSE) algorithm based on successive interference cancellation (SIC) Multi-user detection (MUD) technique is employed at the receiver. Furthermore, log-maximum a posteriori probability (MAPP) decoding algorithm is implemented at the mobile stations (MSs) to overcome the effects of multi-user interference (MUI) effects. The paper also evaluates the effects of coded MIMO-IDMA in the downlink communication by adopting the Stanford University Interim (SUI) and Long-term Evolution (LTE)channel model specifications. In comparison with the traditional uncoded system, the present solution considering turbo coded triple-polarized MIMO-IDMA system with iterative decoding algorithm provides better bit error rate (BER) with reduced signal to noise ratio (SNR). The simulation results also show that though the SNR requirement is higher for the proposed technique compared to the conventional uni-polarized antenna based MIMO-IDMA system, it gives the advantages of achieving higher data rate with reduced cost and space requirements in the context of a downlink (DL).
