交叉极化比是平板天线卫星动中通系统设计和加工的产物,它是衡量系统性能的一项重要参数。针对交叉极化比导致的极化误差,重点研究了交叉极化比对平板天线卫星动中通信号发射和接收系统的影响。通过理论推导和实际测试,结果表明不合理...交叉极化比是平板天线卫星动中通系统设计和加工的产物,它是衡量系统性能的一项重要参数。针对交叉极化比导致的极化误差,重点研究了交叉极化比对平板天线卫星动中通信号发射和接收系统的影响。通过理论推导和实际测试,结果表明不合理的交叉极化比会导致较大的极化误差,降低发射系统的发射效率,减小接收系统信噪比,导致系统性能恶化。为减小交叉极化的影响,建议等效口径0.6 m的平板天线卫星动中通的交叉极化比指标不小于30 d B。展开更多
In MIMO full duplex system,power amplifier(PA) nonlinearity limits the self-interference(SI) cancellation seriously. Most existing methods need to model and estimate the PA nonlinearity in order to reconstruct the SI,...In MIMO full duplex system,power amplifier(PA) nonlinearity limits the self-interference(SI) cancellation seriously. Most existing methods need to model and estimate the PA nonlinearity in order to reconstruct the SI,however the estimation error caused by the mismatch between the estimated PA model and the actual PA property still impacts the cancellation ability,especially when the transmit power is high. In this paper we propose a polarization oblique projection based self-interference cancellation method which does not need to estimate the PA nonlinearity coefficients. It exploits the polarization state information of the signals which is immune to the PA nonlinearity,and establishes an oblique projection operator to cancel the SI. Numerical results and analysis demonstrate that it can cancel the nonlinear SI effectively. Moreover the signal to interfere plus noise ratio(SINR) and the achievable sum rate do not deteriorate when the transmit power is high. Further,the upper bound of the achievable sum rate can be more than twice that of the half duplex.展开更多
文摘交叉极化比是平板天线卫星动中通系统设计和加工的产物,它是衡量系统性能的一项重要参数。针对交叉极化比导致的极化误差,重点研究了交叉极化比对平板天线卫星动中通信号发射和接收系统的影响。通过理论推导和实际测试,结果表明不合理的交叉极化比会导致较大的极化误差,降低发射系统的发射效率,减小接收系统信噪比,导致系统性能恶化。为减小交叉极化的影响,建议等效口径0.6 m的平板天线卫星动中通的交叉极化比指标不小于30 d B。
基金supported by the National Natural Science Foundations of China under Grant No.61501050 and No.61271177
文摘In MIMO full duplex system,power amplifier(PA) nonlinearity limits the self-interference(SI) cancellation seriously. Most existing methods need to model and estimate the PA nonlinearity in order to reconstruct the SI,however the estimation error caused by the mismatch between the estimated PA model and the actual PA property still impacts the cancellation ability,especially when the transmit power is high. In this paper we propose a polarization oblique projection based self-interference cancellation method which does not need to estimate the PA nonlinearity coefficients. It exploits the polarization state information of the signals which is immune to the PA nonlinearity,and establishes an oblique projection operator to cancel the SI. Numerical results and analysis demonstrate that it can cancel the nonlinear SI effectively. Moreover the signal to interfere plus noise ratio(SINR) and the achievable sum rate do not deteriorate when the transmit power is high. Further,the upper bound of the achievable sum rate can be more than twice that of the half duplex.
