一种改进的LTE上行信道估计方法研究

摘要

信道质量指示与混合自动重传请求应答是3GPP LTE系统中重要的反馈信息,在物理上行控制信道PUCCH中的传输采用联合编码和单独编码方式.当上行控制信息UCI单独编码时,CQI参考信号中嵌入ACK比特,减少了用于信道估计的参考信号并且降低了信道估计性能.针对此问题提出一种改进的上行信道估计解决方案,仿真结果表明了该算法在高速多普勒频移环境下依然具有较好的性能,该算法已应用于TD - LTE无线综合测试仪表的开发中.%Channel quality indicator and hybrid automatic repeat - request acknowledgement are important feedback information in system of 3GPP LTE, adopted joint or separate coding when transmitted via Physical uplink control channel. When UCI adopted type of joint coding, performance of channel estimation will decline and the number of reference signal will decrease because the ACK/NAK bits are embedded in one of the CQI reference signals. An improved method for uplink channel estimation is proposed for this issue. Simulation results show the effectiveness of the algorithm int the invironment of high speed removement, which has been applied to TD-LTE wireless integrated test instrument.