论文部分内容阅读
针对IEEE 802.15.3c标准规定的60GHz OFDM-UWB系统,分析前导格雷互补序列的特点,研究可抗多径干扰的定时同步方案.采用归一化自相关法,找下降沿进行帧检测和粗定时,利用格雷互补序列的自相关特性,找出多个峰值求平均来进行细定时.仿真表明,该方案能把残余的定时偏差控制在较小的范围内,同时算法复杂度低,定时精度高,而且在低信噪比的CM1多径信道下,细定时的MSRE能达到10-3数量级,能很好的抗多径干扰.
Aiming at the characteristics of 60GHz OFDM-UWB system which is defined by IEEE802.15.3c standard, the characteristics of preamble Gray complementary sequence are analyzed and the timing synchronization scheme of anti-multipath interference is studied. The normalized auto-correlation method is used to find the falling edge for frame detection and coarse timing , Using the auto-correlation of Gray complementary sequences to find out the average of multiple peaks for fine timing simulation shows that this scheme can control the residual timing deviation in a small range, while the algorithm complexity is low, the timing accuracy is high , And in the low signal-to-noise ratio CM1 multipath channel, fine timing MSRE can reach the order of 10-3, which is very good for anti-multipath interference.