16QAM全数字接收机的研究

【作者】 付锐；

【导师】 王建新；

【作者基本信息】 南京理工大学 ， 信号与信息处理， 2002， 硕士

【摘要】 本文对全数字接收机中的几个关键技术进行了研究，主要目的是提出使用DSP、FPGA、ASIC等器件实现全数字接收机功能的数字信号处理算法。本文首先介绍了全数字接收机的特点及其发展概况，然后介绍了一种用于信号捕获的自适应门限的信号相关检测算法。对于全数字接收机中符号定时误差的恢复，先介绍了一种滤波平方后求符号定时误差估值的算法以及一种提高该算法估值性能的改进方法，接着介绍了纠正定时误差的FIR插值滤波器和立方插值滤波器。对于全数字接收机中的载波恢复，先提出了一种估计范围宽、估值精度高的载波频偏估计算法，接着介绍了一种可以直接对载波相位偏差进行补偿的复相位估计方法。最后完成了一个16QAM全数字接收机的设计，在计算机上对其进行了误码率仿真，并完成了主要的DSP程序，以验证该全数字接收机系统的可行性和有效性。更多还原

【Abstract】 This paper mainly investigates several important problems of all-digital receiver, and intends to propose digital signal processing algorithms for receiver, which is fit to be realized with DSP^ FK^ ASIC devices. Firstly, the paper introduces the character and the development of all-digital receiver, then an adaptive threshold correlation detection algorithm has been presented. For symbol synchronization, a filtering and squaring algorithm of estimating the timing error has been introduced, and a method to improve the accuracy of estimated data has been presented, then two signal interpolation filter have been analyzed, one is FIR interpolation filter, another is cubic interpolation filter. For carrier synchronization, a method of estimating the ofiset of carrier frequency has been presented, which has a more broad range of the estimated oflset of carrier fiequency and more accurate result man other methods, then, a method of estimating the carrier complex phase has been presented, which corrects directly the ofiset of carrier phase. Final, a 16QAM all-digital receiver has been designed and simulated applying all researched algorithms, and the main DSP program has been completed for verify it’s effective and feasible.更多还原