数字通信系统中的符号时钟恢复技术

在数字通信系统中,由于有高斯噪声和多径的影响,接收信号产生损失,从而导致时钟信号的提取更加困难,而时钟信号的不准确性会降低整个系统的性能。本文我们给出一种改进的时钟恢复算法原理,算法主要包含简单有效的插值滤波模块,改进的Gardener算法和快速收敛的PLL。该算法可以适用于宽带无线通信系统中的数字接收机中,采用该算法的数字接收系统已经用FPGA验证通过。

Timing Recovery In Digital Communication Systems

In digital communication systems, since the signal of the receiver is disturbed by the Gauss noise and multipath interference, it is difficult to detect the timing of the transmitted data symbol. The inaccurate timing will decrease the system performance. A new asynchronous symbol timing recovery scheme is proposed for a 64QAM receiver in this paper. The scheme includes a simplified and efficient interpolation filter, an improved Gardener method and a fast converging PLL. The scheme can be applied to wideband wireless communication and a system including timing recovery has been verified by an FPGA-based prototype with real data.