基于DSP Builder的信道化射频同步器的设计与实现

Design and Implementation of RF Channelized Synchronizer Based on DSP Builder

数字电视的单频组网大多以基带同步技术为基础,网络中的调制器具有非线性特征,造成射频接收端存在同频干扰问题。而基于射频同步技术的组网系统只需要在传输中心设立调制器,各个基站采用射频同步器精确控制信号延迟,可以大幅度减少同频干扰。射频同步器是RFST底层硬件系统的核心设备之一,而模拟同步器具有工程造价高、精度低等缺点,提出了一种基于软件无线电思想和多相滤波器组理论的设计方案,能够克服模拟设备的缺点,设计出性能优异的数字射频同步器。

Single Frequency Network （SFN） of Digital TV mostly utilizing the baseband synchronous technology, modulators in the SFN has a non-linear characteristic, likely resulting in the presence of RF receiving end with the same frequency interference. While Radio Frequency Synchronization Technology （RFST） only need to set up a modulator in transmission center, each base station using RFsynchronizer to precisely delay the signals can significantly reduce the interference. However,RF synchronizer is one of the core equipment underlying the hardware level of the RFST system. Because of the analog synchronizers having high cost and low accuracy defects, a software-radio-based and utilizing polyphase filter design theory schedule to overcome disadvantages of the device device are proposed, the design of high performance digital radio synchronizer is worked out.